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Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. This transmitter should not be used as a room or telephone bug. |
Schematic |
PC Board Layout and Parts Placement |
Parts |
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Notes |
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| Add A Comment |
| Is this FM transmitter available in kit form with all the part and PWB? | ||
| Thank you for this great circuit. I've tried it back in 2001 and it's just worked perfect. I've searched for the website and was so glad that it's still up and running. I made a post on my blog and an instructable. http://idea-arabic.blogspot.com.eg/2015/11/fm-transmitter.html | ||
| Hi! I'd like to use the transmitter for remote switching.How to replace mic to send a switching pulse? I'm a teacher in the high school & I'd like very much to put forward this project for the annual competition for my students. Thank you Sir! Ashok. | ||
| Can you please tell me how to make a reciever of the same frequency as this tranmitter. | ||
| KN2222A looks like the 2N3904, soo i think that yes you can use that | ||
| this transmitter needs stable voltage, any voltage trop or rise changes the frequency | ||
| please help me about this circuit,can i replace mic by audio jack ????? | ||
| I builded that transmitter to that PCB layout seen on that page. That little transmitter is very unstable, it drift 89.100 to 89.329, 229khz in 5mins! And FM deviation iss very slow, only about 5khz. So after that I builded smaller versio of that using junk SMD parts and with little modifications. I get it stability to 50khz/5min and deviation to allmost 100khz. | ||
| what is BS170? is this transistor and how this fm transmiter give best result? | ||
| How were the values of the FM transmitter determined? | ||
| Hello friends i maid this Fm transmitter successfully . you can get the all details from this link | ||
| where can i buy a meter of 28 awg enamel coated wire? | ||
| Very very good. I want to create a walkie-talkie | ||
| yes, audio input add to the c3, remove the r5, q2, r4, c4, r6 and mic, as they not needed then | ||
| Can I replace the mic with an audio jack so that I can put an audio input via mp3 player etc. to the transmitter instead? Thank you! | ||
| Can I use KN2222A transistor instead of 2N2222A . Tell me fast...waiting | ||
| i tried transistor 2N3904 for Q1 and it works, after testing and testing the 2N3904 i found that using BS170 gives better signal results. | ||
| Why make one, when you can buy one. I purchased this one http://wholehousefmtransmitter.com and it seems to work all right. Deal with some cracking every once in awhile but it does ok. | ||
| The frequency is determined by the Coil/Capacitor combination. If the frequency is too low, spread the coil or rewind with one less turn, do the opposite if freq is too high. It does not matter if the coil buldges up from the board if you spread it. You also can use more or less capacitance to obtain your frequency. | ||
| Found this circuit on www.radio-circuits.com only it has a better circuitboard layout and also includes a great stripboard layout plus a lot of other fm transmitter circuits with full layouts | ||
| I do alot of fox hunting, How would i make this so it will go on 146.565 and make it more stable? | ||
| view that oscilloscope show the sine wave in antenna outbut, if not try change C2 or C5 | ||
| I built the transmitter, and the first stage is working great, but I just can't get my second stage to resonate. I've wound about 7 pairs of inductors so far and to no avail. I'm using 22 gauge madnet wire for both the inductors and the antenna, anyone have any suggestions? | ||
| Maybe those who can't spell do not have English as their first language. | ||
| Replace L2 with some adjustable coil and add bigger C5 ex: 3-60pf | ||
| Sir I made a same transmitter but frequency is varying 97.5 to 97.8, I want to fix it, if it is possible then tell me, I will be thanks full for you. | ||
| Add some power transistor to Q1, NTE473, 2N3375, BLY87A, 2N3632, BLY89A | ||
| Hallo, i need information about operating a local fm station that will cover atleast 10km of my village. So i need information about the material required especially the kind of transmitter i may use and other materials . Thanks | ||
| Is there meant to be any spacing between the coils in the air coil or should i leave no space at all? I know it affects the overall frequency output.... | ||
| I definitely agree with Compu, It's also annoying when people can't spell simple words like build. It's like they should go back to grade school. | ||
| Agree with Compu. If you have to ask how to build stuff, you're at the wrong place. You're supposed to be at school! Study electronics instead of asking other to do your work. | ||
| Wow, what a bunch of morons asking inane and stupid questions. If you need to ask retarded questions like "UHH I DONT NO HOW 2 BILD A TRANSMITER PLZ HELP MEE", then you clearly don't have the brain power necessary to understand this. OP: Very good information, should be immensely useful for beginners. | ||
| Hello. Can anyone explain how I could build a VERY simply (i.e. morse code) transmitter using nothing more than household objects. Ideally, one which could be picked up by a crystal receiver. Many thanks. | ||
| Im a amateur in Soldering and in EC. Can i easily build a transmitter. i have never done a EC project :( | ||
| Hey the transmitter is working but I am able to recieve sound on destination reciever ONLY when I BLOW in the ELECTRET MIC i.e MY VOICE is NOT transmitted via the Fm transmitter. Pls help.... | ||
| Is there any matched receiver circuit? I would like to build a walkie talkie type thing. | ||
| The second inductor is for decoupling the antenna from the tuned circuit so that moving the antenna does not affect the frequency (a lot). No matter what you do to it this type of circuit will never be stable. Best way to transmit in FM now is to get a car FM modulator with audio input or a Belkin Tunecast and hack that up. With an amplifier using a single RF transistor it is easy to boost the output of those things to several watts. Be on the lookout for the car modulators with LED display and no fancy features, the ones with complex LCD displays tend to have whistling noise that you can't get rid of. | ||
| can some one tell me the use of the second inductor connected to the antenna. if i remove the second inductor and connect antenna directly will it work? thanks | ||
| i have found many ckts for a radio transmitter, will anyone tell me how many ckts do we have for a single device coz i m not able to understand which one to choose. i have already tried to make a radio transmitter from two different types of ckts but none of them worked.........plz someone help me with this | ||
| can u run this on 4.9 Volts. will it work if not can u suggest a circuit that works on this much input | ||
| currently working on this one with my group for our subject Communications..while the other group in my class was assigned to make an AM receiver... | ||
| HEY WORKING REALLY GOOD...!! BUT HAS VERY SHORT RANGE... FOR THOSE WHO ARE HAVING PROBLEM ... REGARDING INDUCTOR: 1.BUY ENAMEL COATED MAGNETIC WIRE TO BUILD INDUCTOR. 2. CUT WIRE INTO TWO PIECES : 8cm EACH. REMOVE ENAMEL COATING FROM BOTH ENDS OF WIRES.& CHECK THE CONTINUITY 3. TAKE A PEN REFILL (LEXI,CELLO ,TECHNO TIP.ETC ) WHICH HAS OUTER DIAMETER OF 3.2mm approx. 4. WIND WIRE ON REFILL (5 TURNS). 5. DONT BEND WIRE WHILE WINDING, REGARDING CAPACITOR: 1. IF YOU DONT HAVE VAR. CAPACITOR THEN CONNECT ANY FIXED CAPACITOR (disk) BETWEEN RANGE OF 3-18pf. REGARDING ANTENNA: 1.YOU CAN CONNECT SIMPLE WIRE ALSO. REGARDING RECEIVER. 1, IT WORKS VERY..WELL WITH CELL PHONE RADIO RECEIVER DUE TO HIGH SELECTIVITY.( VERY CLEAR.) TUNE IT IN AUTOMATIC MODE. 2.WORKS VERY VERY POOR WITH TRAD. RADIO RECEIVERS. REGARDING TRANSISTOR: ...I USED 2N2222A . DRAWBACK: 1.SHORT RANGE. BEST SOLUTION: 1.BUY LESS TOLERENCE COMPONENTS. FOR MORE COVERAGE.. 1. PUT POWER AMPLIFIER BEFORE ANTENNA. (FOR POWER AMPL. .....SEARCH ON GOOGLE ). | ||
| For those asking to further the range. You can easily amplify the signal, but after grabing a certain distance the fcc will get on your tail. | ||
| DOES NOT WORK!!!! i have put 18 AWG coils! What to do! | ||
| Im a thirteen year old and i want to build 1 | ||
| Is their anyway to test the circuit without having to search through every radio frequency? A fast reply would be greatly appreciated. | ||
| i try 1.3watt fm transmitter amplifier with 2sc1970 & c2053 its the best .... check google search | ||
| Hi, My brother and I are planing to make two for a intercom, is this to powerful for indoor use? Or is it just that you do not want people using it as a bug? Thanks a lot, AnonymousNerd | ||
| I am not an enginer, I do not know how to build a transmitter but I need someone who can get me one. Thank you. | ||
| How can i produce a desired frequency?? What parameters should i change to get a lower frequency radio wave? | ||
| what is the substitute for 3-18pf adjustable cap?? | ||
| i want to open a fm radio station in my colage...what would be approx expense for range up to 3 km...what all shall i be needed... | ||
| Can you give me a more powerful (range: around 2-3 km) Fm transmitter circuit diagram. It could be very useful for transmitting songs to all fm mobiles and fm radio from my mp3 player for free. | ||
| I'm back. Works great. I haven't got it to go no more than 100ft or so. Not sure if its the antenna, longer? It works without the Variable Cap but can't tune it using a regular 5pf Cap. Got my iPod to play from it but its really hard to get a clear signal and it decreased the distance to like 3ft or so. I also used 30-22AWG wire and it still works. To increase the distance I believe one can build a special FM Amplifier but I haven't gotten to that yet. Its been fun and thank you for providing this circuit. | ||
| what can i do to increase the range of FM transmitter? | ||
| I'm fairly new to electronics and in trying to build this circuit I came across a few answers. You absolutely need an adjustable capacitor with the recommended value to tune your cicuit to the desired FM frequency. It is super sensitive so grab a radio and look for what frequency you are on. Also after the circuit has been on for a while the frequency changes when heat builds up so you have to keep adjusting it. I also found that putting a 10k and 4.7k resistor in series to the + terminal helped my electret mic(from Radioshack) pick up more sound. I'm sure you can use 26AWG or 30AWG. Best advice is get a breadboard and test every question you have. I am not finished with this circuit yet. I still have alot to learn. I'm sure you can hook up any output instead of a microphone but I will try it. | ||
| Can you give me a more powerful (range: around 1-2 km) Fm transmitter circuit diagram. It could be very useful for transmitting songs from my mp3 player to my easy portable mobile. | ||
| hey, i would like to know what is the frequency used in this fm transmitter. I would like to build my fm transmitter for my design project and what is its gain and output power? can you give me a complete computation about the above questions i have already mentioned? | ||
| HI, WANT TO KNOW THE DIFFERENCES BETWEEN FM TRANSMITTER AND AM MODE OF TRANSMITTER AND HOW FM TRANSMITTER CAN HAVE A STABLE GAIN | ||
| I build it, and it works realy good. Thanks | ||
| How can i produce a desired frequency?? What parameters should i change to get a lower frequency radio wave? | ||
| hi is this necessery to make the circuit as shown on the fig 3 of pcb mean that can the position of components can be changed??? if not then why??? can i make this on varo board?? sorry for any grammer mistak saad pakistan | ||
| please can somebody tell me if the indcutor specifications do not meet.i.e if 28 AWG enamel coated magnet wire is not available. can i use a simple coil and wind it. also it is nessecary to use a variable capacitor? | ||
| May I connect something else than electret microphone? Maybe a plug from computer? | ||
| I want to know the specifications and uses of all the components used in this circuit. Please anybody send me minute details of the components and their purpose.Also I WANT TO KNOW ABOUT THE 5.6uF CAP. AND POSSIBLY A SUBSTITUTE AS ONE IS NOT AVAILABLE PRESENTLY.SECONDLY I WANT THE DETAILS ABOUT THE WORKING OF THE INDUCTOR COILS.These two are primary objectives and then the rest of the other components. Please somebody ler me know about the components' working and oblige.Thanks. | ||
| May I connect something else than electret microphone? Maybe a plug from computer? | ||
| What is the value of the inductance when wound as specified? | ||
| Hey guys just finished building this circuit. It does work but is very tempremental. As soon as something comes within 30cm of this circuit it changes the frequency of the transmitter, or as your battery drops its voltage frequency also changes. | ||
| @ Chris Why don't you just learn some of that stuff at least the basics so you can read this. You don't need to know everything related to electronics to make this thing. The only thing you need to know is how to identify the pins of the transistor. that is the only thing that you cannot understand by looking at this diagram. Even then with the the a pc board diagram shown here You don't need to know anything about that. If you google everything you don't understand you would know how to build this in and hour or two. The lines are wires the symbols are different components and some have + - sides like batteries and some don't. You just have to figure out which end is fixed to which wire(basically what goes where) and solder them or use a thing called a breadboard where you just have to plug everything(no soldering). For your information this is a very easy transmitter to make. And if you seriously want to make this I'm sure you'll just Google everything and make one. if you are unsure make a small Led blinking circuit first to get a hang of everything. I repeat its not hard but you have to make an effort. Asking for a better diagram and better explanation for this circuit is like asking for a cab to pic you up near you bed so that you would't have to learn how to walk to the door. | ||
| i am going to try this. we can use a fixed capacitor (say 10pf) and we can alter the coil length to get the required frequency. Testing this circuit requires a lot of patience as u have to tune it to know the resulting frequency. I prefer u to use a phone with fm receiver. search for stations and u will probably know your frequency. Hope this will help u a lot. enjoy [:)] | ||
| In what frequency(channel) do this transmitter send information | ||
| Hello I am building a low power fm transmitter and I believe the last step I'm having trouble with is the inductor coil and making sure I have it correct does anybody have some good knowledge on inductors and how to make sure u have it correct? Thanks | ||
| bulit one but it does not work, i think the core part of it is the LC circuit, if the inductor or capaciotr value varies, the osillating freq can easily out of range between 88~108MHz | ||
| sine: The capacitor needs to have approximately the same range (e.g., 2-20, 5-15, ...) to stay in the same frequency band. If you stray from this range, you'll need to compensate by changing L2. Chris: If you can't read a schematic, you don't want to attempt this project. Start with something a bit simpler to get your experience level up a bit. It's easy build a ckt that won't tune into the FM band if you're not careful with layout, etc. Vinod: The capacitor between C and E is to provide feedback to make the circuit oscillate. | ||
| This should work fine. Download "LT Spice IV" amd you'll see it works just fine. I built this 35yrs ago and as kids we had a lot of fun (in the UK, the police band was just above the commercial FM band and this circuit tubes there too!), THe circuit I built then had a POT accross the microphone to adjust adio sensitivity - that may be needed here. I also reacall the circuit is very temperamental even when your hand comes close it stops (or starts) working. Play with that and tweek the coils, you'll get it working. Tomorrow I will build this with my 12 yr old son. | ||
| Sir l would like you to provide me an advise as how to set up an FM station with range of 70km.and also provide me with the sites where l can get a reasonable deal.Actually am looking for used equipments with computer. | ||
| hello dear iam live in ethiopia at the western waht ihave acommet is iwants to work atransmiter but i couldnt get the transister type like2n3866 the same as other can u support me how ican get it or equievalent pleas support me thak u | ||
| tempting to build one. But does it really work? I need to know cuz there's no point in building something that wont work in the first place. | ||
| Hey i am not very good with electronics but i would like you to send me a pic or something that shows me how to make a very easy FM transmitter, but not a diagram that says r1, r2, 10k resistor and all that stuff can you step me through what i have to get, what it looks like and where to put it | ||
| Guys plz help. I made this circuit and it didnt work. I didnt get the exact VC and wire. Please tell me is there any substitute for varicap and wire used. | ||
| what value of capacitor can i use in place of the 3-18pf adjustable | ||
| I built this, and it worked on the breadboard, but when I put it onto PCB it didn't work. Turns out it's only oscillating up to ~50Mhz now, should be easily fixed by messing with cap values. Moral of the story is, if it's not working, check it on an oscilloscope and make sure it hits the right frequency range. | ||
| this circuit is very good just dont construct this on pcb , simply soldered the components together, i also used dipole antenna, it works, w/ range upto 1 km on a good quality recevier, 500 meters on my walk man, | ||
| What s actually an electromagnetic wave? Is there any magnetic field transmitted from the antenna of an FM transmitter? What is the function of capacitor between emitter and collector of the output transistor? What is actually happening in the transmitting antenna? | ||
| i had finish repairing my FM Transmitter but it does not work | ||
| this circuit is ok | ||
| What a bunch of morons asking a bunch of braindead questions. I assume the target frequency is 88-108Mhz, to match the average IQ of the contributors here. Sorry for the dumb comment, just thought I'd try to fit in. | ||
| this doesnt work it wont turn on i get no tuning or anything | ||
| If i only want to transmit at 88 Mhz, what value of capacitor should i use instead of the adjustable capacitor | ||
| how do i bypass the battery with .01uf capacitor | ||
| i had finished doing the fm transmitter.My only problem is that i only have little ideas about this circuit and i need more for my written report.can you please provide me the ideas i want to know aabout this fm transmitter especially it's function and the role of its parts? | ||
| your fm circuit does not work while we use condenser mic and send simmiler transister of 2N2222A | ||
| I make fm transmeter by using your circuit but it do not work,why? And I used condenser mic | ||
| Does it mean that, all modulation and amplification also done by this circuit ? Please let me know about this. Thanks karthik | ||
| On which frequency i can pick up the signals. The Q2 transistor happens to be very hot easily. is it normal thatway | ||
| hello,how do i bypass the battery with .01uf capacitor and what its job.thank you from jason | ||
| Just finished mine, its awesome, works perfectly, thx! | ||
| on which frequency i can pick up the signals | ||
| i got the fm transmitter working but it still has a lot of interference. however i am not use a variable cap instead i am using the cyrstal or cap i do not know what its called that you get from a remote for a radio controleld car at 49 mhz and the radio still picks it up and the frequncy on the lcd diplay magicly changes. Weird! if anyone knows whats wrong plz send a email reply or comment back | ||
| the trasmitter is quit simple but i think that more explanations should be given about the circuit connection | ||
| and i can make the antennae as long and tall as necessary and a custom receiver. i just need the signal to be heard clearly and reliably at the other end. I'm also not going to be in the standard radio range. i basically just need ways to make the components take more volts and then push that to the max then make up for whats left with antennae height. Thanks for your help. :) | ||
| What would it take to boost this thing to a range over 8,500 w/o burning out any components? i calculate 255 volts but that would certainly fry almost anything. i was looking for something to take and boost the outgoing FM signal instead but no luck so far. | ||
| im in need of a circuit that will transmit at a distance of 100m for only audio if any one has one that has made into trial and has worked please send it to me i will appreciate. | ||
| How to build simplest FM Receiver ? | ||
| hey i got info about how to make a long range fm transmitter...that has a range upto 70 kms..but is its making is not easy and the components needs to purchased..there are very few shops even where u get all that components u need..plus u would need to make all the coils on yr own witth high amount of accuracy.. | ||
| Does anyone know at what frequency can you pick up the signal? (say you are using a FM radio) | ||
| this circuit is very easy | ||
| Hi I making fm transmitter but didn't success. Pls. can anyone help me to provide with working schematic diagram of FM transmitter. would be greatful if you also provide all detail calculation and comments on it. cheers | ||
| how to make a fm transmitter with a 5 km range and a also a highly sensitive fm receiver. | ||
| has anyone measured frequency response and signal to noise ratio? i plan to put this in my car with my laptop since we have no good radio stations in the mississippi delta! | ||
| i want to know if an FM receiver receives the signal it can be generate electricity with some special Hardware .?? | ||
| How far will a 10watt FM transmitter broadcast, assuming a good antennae? What's the radius, or range? 5 miles? We are fundraising for a LPFM station and may use this circuit for our transmitter until we have the cash to buy a new, more robust transmitter. | ||
| how to make a fm transmitter with a 5 km range and a also a highly sensitive fm receiver. also pl send me the substitutions for the coil of th trans.plz give some theoryticaly and practicaly dacument about fm transmitter.. | ||
| Does anyone know if you can run this transmitter from your computer, transmitting the signal of what ever is playing on windows media player, if so how would you do this? | ||
| what do the wire coils do exactly are they acting as inductors? do they have anything to do with getting the the dc voltage to oscillate? | ||
| The transmitters is a very basic one U can increae the signal strenth a little by increasing the capacitor betwheen emitter & collector of the filnal RF transistor up to about 22pf.Try it & u will see the differece. | ||
| how to make a fm transmitter with a 5 km range and a also a highly sensitive fm receiver. also pl send me the substitutions for the coil of th trans. | ||
| I have Absolutely no knowlegde about Fm transmitters, but I have a dream of running a low cost radio station in my neighborhood with a radius of aproximately 10km.What do I need. | ||
| My experience told me that no matter how it is boasted to be well signal transmission, FM transmitter like this always delivers a litter noise in the back ground. As the range, far enough. Most of the case are i used it in car with car stereo.So basically, it satisfied me. Which i had expected some worse. The prices of this kinds of gadgets are downright cheap these days. | ||
| i would like to increase the transmitter range ,what would i do for that? thanx | ||
| I want to make a long range FM XMITTER as my final year engg. project. can u plz. help me? | ||
| i find ur layout simple & i will make it | ||
| I want to replace the mike with a Cord as an input to Computer so that the songs played in computer can be transmitted. | ||
| i want 2 make a trnsmtr with the mic is replacd with a mp3 player...... 4 that, wat changz should done in this circuit.........??? pls help me..! | ||
| Does anybody have a .pcb file for this so it can be used in pad2pad? | ||
| I have a 433.92 MHz receiver that i would like to use to receive signals sent from this transmitter. What value of C5 would i need to use?? Thanks in advance My email is Hydro_dmc@hotmail.com | ||
| the transmitter is ok but u need to set alternatives for the coil wire also. | ||
| this doesn't work for me!for what reason nd where woul we put the battery bypasser (note 5).doesn't an air coil is made without the need of using nail polishing in it? thanks | ||
| Would it be possible to remove the mic, and attach an audio source like a mp3 players headphone jack output to this circuit? | ||
| i want to have a very simple fm transmitter with a minimum range of 50 meters, can you help me please? i want a simple and not complicated circuit for my final project. and also a less expensive components....please help me!...thnx so much in advance!.... | ||
| thnx for your circuit. i'll try this one for our final project. | ||
| For L1 & L2 can we use inductor with about 1mH inductance instead of AWG wire. It is hard to get AWG wire in this part of the world!! | ||
| please i have try most of your circuit and is very affective as you stated, now i need very powerful UHF & VHF antenna please in know you can help me of it. | ||
| Would it be possible to remove the mic, and attach an mp3 player in its place? If so, could it be done easily? (like simply taking a pair of ear phones and cutting them and attaching the wires to the transmitter) | ||
| How is dimension of board. Please help me . If these transmiter fm ready is operative???. please help me i'm young electronic from polen | ||
| I have built the transmitter carefully using maplin parts and the mic salavged out of a pocket pc, the coils I made were constructed from 30 SWG as Im from the uk and AWG is hard to find so 30 SWG was the closest I could muster. I used clear nail varnash to hold them together and it is currently on breadboard working a treat! voice modulation is very sensitive from across my lounge and I even tested it using CW (morse) and it worked perfectlly. However It seems battery voltage is critical in its oscillation and require 8.5+ voltage. All in all a fun project that works surprisinly well with a good range and penitration through walls. | ||
| please guid me for desining fm transmittre & reciver This project choose me due to my collage which is used for security & daly anocingparpose so .............. d.nath | ||
| i have seen ur circuit but its power is very low and it is not working for usable distance how can i increase power upto range 2 km | ||
| Good Day, I appriciate your site. Its Really helpful for young electonic engineers. But I am trying to work on a security transmitter. That at the push of a button, signals are transmitted for a point to one or more recievers that can be a lot of distances away. What circuit can you recommend. Both for the transmitter and reciever? thank | ||
| I want to make a module that opperated minimum from 25Km.So plz send me circuits of fm transmitters or wireless systems which can opperated from maximum distence | ||
| The adjustable cap is a frequency filter so you might wanna look for low pass and high pass filters (They're basically just caps and resistors connected parallel to ground), | ||
| hello I will like to carry out a radio operator emettor and receptor and I miss experiments in this field, for that I will like to be guided and followed your share thank you. salut j'aimerai bien realiser un emetteur radio et recepteur et je manque des experiences dans ce domaine, pour cela j'aimerai bien etre guidé et suivi de votre part. merci | ||
| GOOD WORK YOU ARE DOING, KEEP ON! PLEASE I NEED CIRCUIT OF 4W FM TRANSMITTER, RECOMEND A SITE FOR ME | ||
| 200 kilometer fm reciver avilable? | ||
| I want to start a fm station in my city in coimbatore how to start i want your advice please help me | ||
| I have a project an fm jammer with scannign from 88Mhz to 108 Mhz. It isn't important range of jammer 15 m is enough can you help me??? | ||
| Good Day, I appriciate your site. Its Really helpful for young electonic engineers. But I am trying to work on a security transmitter. That at the push of a button, signals are transmitted for a point to one or more recievers that can be a lot of distances away. What circuit can you recommend. Both for the transmitter and reciever? thanks... | ||
| good,sir i want to transmit signal arround 10-15km for with good quality for communication.how it is possible & could you tell me about sattelite comunication.i trying to make remote controlled aero model for long distance control. thank you sir. | ||
| It is a very good circuit which realy very much qualifies the basic need and have the extendability in it. At the student level it is a very very hekpfull circuit diagram which promots the ideas in and student mind raised. | ||
| I'm trying to figure out how to change to a frequency outside 88-108MHz. Could anyone give me a few key words to Google, involving what needs to change with the3-18pf Adjustable Cap? How do I specify a different cap for different frequencies? Thanks. | ||
| Sir, I want to start a fm station in my city.My city is having the area of 65 kms all around.how can i start it?and is this possible to start it?what i hav to do?tell me please. thank you | ||
| want make a wide range about 10 km fm transmitter pl send full circuitdetails.and also send what is the procedure to start fm station. how can i get frequency permission .and say estimation cost of start fm station | ||
| Good Day, I appriciate your site. Its Really helpful for young electonic engineers. But I am trying to work on a security transmitter. That at the push of a button, signals are transmitted for a point to one or more recievers that can be a lot of distances away. What circuit can you recommend. Both for the transmitter and reciever? thanks. | ||
| i want make a wide range about 10 km fm transmitter pl send full circuitdetails.and also send what is the procedure to start fm station. how can i get frequency permission .and say estimation cost of start fm station | ||
| Please how can i implement this cct diagram of a transmitter and test it efficiency/. | ||
| Thank you editor. Your simple effective design is perfect. I applaud your patience with the hundreds of spam requests. Use google people. I can only assume thats how you found your way here. "What do the transistors do?" What are you doing on this site? lol Honestly though. Thank you for your time and effort. No information is needed. Please dont contact me at my email. :P | ||
| i want to transmit fm signul around 80km to 100km,can u show me circuit desine & is this possiable ? | ||
| where can i buy a 3-18pf Adjustable Cap??? | ||
| Thanks a Lot for your usefull circuits. please include in your site images bigger schematics because in some computers is nearly dificult see the diagram details. Thanks anticipated. | ||
| i want to build up a fm trnsmitter whose operating rang should be above 20 km | ||
| can i use 1 or 2 21 uF capacitors instead of 2 10 uF caps? | ||
| Can anyone tell me dimensions of coil ? | ||
| What is the equivalent inductance of the 5 turns AWG coil? I need to know that to check if i done it correctly | ||
| what is a trimmer? | ||
| Can someone tell me what frequency this runs at, or where to find a schematic for the receiver? | ||
| This circuit is workng properly bt sm distrbance is there. Instead of adjstng capicitor of 3-18pf a trimmer cn b usd. | ||
| i recleanup a small schematic check to see if all connectyions are correct. I was worried after drilling hols the pads would tear. this one has more even pads and better holes. | ||
| can anyone send me how did the author get the values for the capacitors and resistors in this circuit? i really, badly need for my electronics design project, pls help me, thanks.. | ||
| i want make a fm transmitter up to 5 km range .can u help me | ||
| i want make a fm transmitter pl send full details.and also send what is the procedure to start fm station. how can i get frequency permission .and say estimation cost of start fm station | ||
| i can't get this fm transmitter working, can someone help me? just send me further details and tips on making this. thank you. | ||
| what is the working principle of miniature fm transmitter? | ||
| does anyone know the EXACT parts and shematics of the small room bug that is shown in the book '101 spy gadgets for the evil genuies' or a quick pic of it is on atomiczombie.com if anyone can help me out with how to make this bug it would be highly apprechiated. vinnie | ||
| I would like to buy a FM transmitter that can brodcast up to 5 miles, do you sell them here, or is someone willing to selll me one, I have no time to learn how to build one and I cant find any onlkine to purchase. I would like to play radio show programs from my pc and have it reach out to all the people in my small town at most 5 miles, more like 3 , can anyone help my out! | ||
| I have a 5W transmitter w no antenna... whats a widely available way to get a good innercity range with this device (5 miles)? thanks, please email teenagepillparty at hotmail | ||
| am planning to present a project on this topic and i think this circuit looks abit simple but does it go along with anything or by just making the circuit on a circuit board will be enough?please help me,any one. | ||
| thank 4 ur information... | ||
| It's very good for broadcasting in campus and other | ||
| I think the fm transmitter is great and very efficient.I was doing a project on radios and I found it very useful.THANX ALOT!!! | ||
| Its great, costs £1.50 in total from bitsbox.co.uk excluding Mic and board! | ||
| i a maked a 5 km raing fm transmitter.you sending my mail adress his diagram & component list. & his cost | ||
| How would one modify this (or another xmitter) to transmit in the 460MHz "Family Radio Service" (FRS) band? I am not satisfied with commercial FRS units. Any info on an appropriate receiver would also be appreciated. | ||
| i want to make project on these topic so anyone can help me to give all information on fm transmitter so that i can present whole information step by step with proper circuit diagram and n easy language.... if any one can help me please send me an email with topics information and all | ||
| i want to start an fm station in our college. how much cost it will take and can i use this above transmitter ? | ||
| i want to build an fm transmitter havinga range only five miles .plz help me for this | ||
| When i connect the transmiter with adapter(power supply) it make extra noise with sound how to overcome this problem | ||
| can you please give me as much information as possible on how to improve a CHAO YU cymp3tx2R1 f.m. transmitter I have. This transmitter is sold as an mp3 to HI-FI gadget. The case is white plastic,using two 1.5 volt batteries.Thanks very much my friend! | ||
| we need a very complex circuit on fm transmitter | ||
| If i want to use this transmitter at car supply ( 12v ) is necessary to make some changes? please if somebody know, email me | ||
| i also wanted to get a fm receiver circuit for this frequency transmitter can u please tell me | ||
| how can i make a FM trnasmitter for make a radio station. which can broadcast to much kilometers. my city population is 5 lakh and how can they all recives my broadcast on their radio-sets or mobiles. | ||
| this transmitter is great, i'm using as a wireless radio beacon. thanx!! | ||
| pl send me the circuit details of transmitter and receiver circuite of handling 2 g hz signal appx. 150 watt power | ||
| Would changing the 5.6pf capacitor to either a 5pf or 6pf significantly affect operation? | ||
| hay mudasar!! have u find any help regarging that of FM radio station. if yes then do mail me . will wait for it.tc | ||
| It doesnt work, impossible to get the correct frecuency on the radio and/or transmitter | ||
| we are a church organization that wants to start up an fm radio station. please help us with the data on how to best do it and the relative cost involved. | ||
| Do you have a schematic for a 216mhz crystal controlled low powered small transmitter as used in tracking small birds | ||
| i wanna start my owne fm radio station in lahore pakistan how can i start plz tell me | ||
| sir plz send me information about the requirements which i needed for setting a transmitter in my local village,what money i have to spends and also tell me about companies which gives such equipments | ||
| Sir can you please send me the schematic of the receiver which is working with the transmitter which is given in the page, I berg you, can you please send it urgently. | ||
| Sir, iwant to know the voltage of each capacitor used on the fm transmitter circuits. Plz Sir, Keep me posted. | ||
| can u pls help me on how to build a simple radio transmitter with the use of computer mother board | ||
| do have any FM transmitter and recieve circuit ? can i using FM to tranfer the video signal? I have 1 project any advice I.one ccd camera II. one tv *distence 4m-6m can i using anyting to transfer video signal? Thanks for your reply! | ||
| sir i ve 2 make my own fm transmitter station in my area through which my transmitted programs woulb be heard by other people on their mobile phone plz guide me sir send me whole procedure + circuit diagram 4 this Sir plz fast my tech fest is near. ckt must clear because I'm beginer. I'm doing b.tech ( 2nd yr)from elex branch. | ||
| can we not make a forum to link technicians around the world ? this is a very good study that has not yet beenn siriuoly taken into considearation (Editor's notes: http://www.aaroncake.net/forum) |
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| how to build 350 mhz transmitter? pls tell me if any one know | ||
| Tell me about how an FM tansmitter wors, its risk areas, the good practices one should encourage and the bad practices one should avoid | ||
| sir i ve 2 make my own fm transmitter station in my area through which my transmitted programs woulb be heard by other people on their mobile phone plz guide me sir send me whole procedure + circuit diagram 4 this | ||
| i want to know the cicuit diagram of fm transistor & working of the same | ||
| I decide to do my project using fm transmitter.I need the clarity of the fm transmitter to be high .Which type of transmittter to use.I need a clear view | ||
| i just join a fm radio station in pakistan.i want to know how to install i mean instalment of transmiteer and receiver.the comminication setup b/t them. | ||
| i wanna start my owne fe radio how can i start any one tell me | ||
| The most stable analogue fm transmitter is using coupling coil transformer over ferite core, regulated volatage for the first stage and second stage and housing in metal case. Every stage also must be isolated using metal housing, like every person in their private small room. Crystal controlled FM transistor is also stable but hard to get intended value and builder must be good in calculating frequency doubler(multiplier). Multiplier is good to avoid output RF stage from being pickup by input stage(just like mic echo over own speaker). | ||
| how to get the receiver the can pick up the freqency of this transmitter. | ||
| THIS SITE IS AN ANSWER 2 MY PRAYERS!!!! YOU ROCK! | ||
| thank u this transmitter is the invent very interesting for my | ||
| if you have a diagram pls send me and also you a picture of a finish board.and you can tellme how can i pay.and also how can i buy your board including the price.tnx | ||
| the transmitter show is only for mono sounds..... i want a stereo fm transmitter | ||
| HI,IM ASSEMBLING A RADIO REPEATER AND IM LOOKING FOR SOME AUDIO ACTIVATED SWITCH FOR THE P.T.T. OF MY TRANSMITTER..PLS HELP | ||
| i want to know who inverted transmitter | ||
| The classic 'Mister Microphone' transmitter circuit! We've built this one many times as a 'quick and dirty' project that kills a couple of hours in the construction, and then provides many more hours of entertainment to keep the kids busy playing 'radio station', and out of the adults' hair. As others have noted, the circuit can be a bit "twitchy", and sensitive to touch and proximity while adjusting the tuning. I'd recommend a metal enclosure, such as an "altoids" mint tin, being carefult to insulate the connections from the enclosure. The value of the tuning capacitor is only somewhat critical - so long as you get something close, you can tweak the coils to adjust the tuning as well. We've even built versions with fixed caps for C5, and used nothing but mechanical adjustment of the coils to tune to a specific frequency. To those who insist on asking for detailed information, documents on transmitter theory, "do my homework!" requests, etc.: Google is your friend. | ||
| Hei. I'm looking for some infomation about radio transmitter. Is there anyone who can tell me where I can find that? I need to find out which frequency is the lowest to go through concrete? And something like that. Thanks | ||
| how do u bypass the battery w/ the .01 uf capacitor? | ||
| plz tel me long rang fm mic 5km | ||
| Hi! I wanted to ask you about the values of the two coils (L1 and L2). How many nH or pH would one be? I am using enamel coated copper wire so the values might differ. Thanks in advance. | ||
| What is the rang of frrequency of the carieer ? | ||
| can u please explain me how the circuit work? | ||
| Godwin sunday esu thank you for your good work God bless you continue like this and improve education starndard in nigeria thank you | ||
| this ckt is good but i want to know the ckt that can transmit radiations upto 2km with obstructions like buildings etc | ||
| hi can u give me an insight on radio transmitter. What kind of transmitter do i need to reach a 1km and more? | ||
| i want know why increes reng of fm transmitter some thing 1 or 2 kilo mitters pleez tell me | ||
| im interested in your FM Transmitter, sir, can you gave some explanation on how does it works? thanks... | ||
| Hi ! This is a very nice circuit. It works satisfactorly.. But I am unable to increase it's range. How i can increase it's range? If anyone knows then plz mail me... | ||
| it is good fm trasmiter | ||
| Could you explain me. how this work? | ||
| hi i want the circuits transmitter and receiver, the range is about 1km . thanks | ||
| how it works....??? | ||
| i want know why increes reng of fm transmitter some thing 1 or 2 kilo mitters pleez tell me | ||
| can anyone plzzz explain me how it works....???? | ||
| Hello, i am in afghanistan & non of the components are avalble in kabul, therefore i have cant make but i am trying to get it from Pakistan. Thanks for the information & instruction | ||
| i want to know the construction details of fm transmitter,it's applications and limitations. | ||
| please i need to know the history of invention of a low voltage fm tranmitter,it's principle of operations and the theory behind fm ransmitter. | ||
| plz tel me the range of transmitor | ||
| please, i need a lebelled diagram for FM Transmitter circuit with two transistor with mic | ||
| sir like you transmitter and kindly tell me how i cand get it | ||
| we need simple fm transmitter 300m | ||
| this circuit doresnot work, please send a proper diagram | ||
| please give me more details abt this fm transmutter | ||
| pls i need the construction of this fm transmjtter | ||
| could u please send me full details on how to build an FM Transmitter similar to the one above... | ||
| i want to know more about basic about fm tx one time i make this ckt running on 93.5 to 93.6 but i lost it i again make it plese help me | ||
| some of the components given are not avilable in nigeria, please provide them. | ||
| WHAT IS THE DIFFRENCE BETWEEN TRANSDUCER WITH CURRENT OUTPUT SIGNAL AND TRANSMITTER? | ||
| The circuit above shown cant functioning. Is the transistor works for all the frequency including audio to radio frequency????? | ||
| are there any similar circuits with out coils L1,L2.it is difficult to design them | ||
| this transmitter is great like a wireless microphone... this is a 'bug'... to cover miles you need add the power amplifier at the output... | ||
| can i substitute the mic with a 1v peak to peak input? | ||
| Hi I am fuad mgrakony from Syria I want to ask you around some type of FM Transmitters Pleas help me, I want to make fm station what's the best type of FM Transmitters I want one of them Its power is over 100 watts Distance transmit range over 50km Frequency range from 88MH TO 108mh Pleas help me what's the best type for me and what is the figure $ ? pleas send to me what's the best type for me and its properties on mail : Thanks Fuad mgrakony Latakia - Syria | ||
| i need todevelop an fm transmitter which can work in the at 92 mhz what components i need to choose. also i need its range to be approx. 1 km.can u help me. | ||
| So... can we use that circuit as a tele switch (wireless switch)?? Please contact me thank's before... | ||
| I build thiis FM Transmitter but it dosen't to me!!! plz help me! tnx. ariel.gugu@gmail.com | ||
| anonymous you re agood engineer in electronics department,bcos i have more effort in ur previous circuits audio amp,fm xmitter e tc | ||
| WHAT THE HELL IS AN FM TRANSMITTER!? | ||
| waste of god time does not work | ||
| What is difference between FM transmitter & AM transmitter. (Editor's notes: One is FM, one is AM.) |
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| great | ||
| I'm looking for a FM Transmitter that gets up to 5-10 miles for cheap so if anyone can help me that would be sweet... | ||
| Iam intereseted to open a commercial fm radio station in Dar es Salaam,Tanzania.The city got about 4m people,I dont know it square miles.Could you advice me where to get good deal for fm radio station equipments? Regards,UM | ||
| i m in 5th ec. can u suggest me is it ok for me to put fm transmitter in state level compitation? if not then give me some idea for new project. thank u | ||
| would you please send me FM transmitter circuit that can work for an area of 30KM. | ||
| hi, i have made this but it doesent work.what should i do now? | ||
| ple sent me, how to make our own fm PC Board Layout and Parts Placement in full information . | ||
| I was made a lots of this circuits in the past years. This circuit is some influenciable. You need a metal chasis to isolate it from external interferences if you want more stability under all environments. But it is stable if you adjust the coils and the variable capacitor and don't touch it anymore. You can enlarge or shrink the spiral separation in the coils. So, you will modify the operating frequency of the circuit. You don't need to touch the variable capacitor if you enlarge or shrink the spiral separations. Be patient because the operating frequency can easily vary only touching a component or enlarging/shrinking a little the coil. You must adjust the coil and latter try to tune the receiver. So doing that very times you can get a fixed operation frequency. And when you get that, you must fix the coils with some glue. The input voltage too influences in the operating frequency. Try to get a stable power source. When the 9V battery discharges the frequency down. Antenna: You need some 1/4 wavelength (75 cm) of wire. Any kind of wire can be an antenna (isolated or not isolated). If you need more coverage you must construct a decent antenna (search in google). Wire of coils: You can use some thelephony installation or UTP wire (0.6 mm diameter aprox.). Or same kind isolated or not but if it is not isolated you must do avoid spires touch the others. | ||
| would you please send me FM transmitter circuit that can work for an area of 30KM. | ||
| The schematic doesn't indicate any adjustable component. And this article makes no mention of it, so I assume this transmitter transmits over the range of 88-108MHz and is not configurable for a specific frequency within that range (unlike commercial FM transmitters for MP3 players)? (Editor's notes: C5) |
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| hi but the fequencuy of the circuit is | ||
| i'm looking schematic fm transmitter up to 200 W | ||
| nice circuit, works as described but i'm having trouble locating a good electret -> shouldn't one from a headset be acceptable? it only seems to pick up loud taps on the mic re stereo jack/active input questions: could this transmitter accept an active signal from a preamp, stereo, etc w/ or w/o modifications? thank you! | ||
| the circuit is very simple and a simpler circuilt would be dificult to produce and the use of such a device is illegal (in england at least) and if you had a devce with a range of 20km it would probably be confiscate by ofcom or FCC. what would be good would be to have a directional antena which would direct the radio waves in the direction you want them to go and less away from your reciever. googleing anntena design may help you the wave length is ~ 2 metres | ||
| where can you buy all components? | ||
| pls u can help me to construct 1 km range with very very senestive Mic. | ||
| Is it Working...? Have any one of you tried this circuit... Plz Tell | ||
| hi! pls. send me a fm transmitter with 5km range. thanks. & mopre power to you. Jun | ||
| I Want to build Fm Transmitter Project in my city. I want to know about all setup, equipments,doccuments and all over cost.That is detail Project report FM Range is about 100KM. | ||
| pls l will appreciate it if u can send me a more comprehensive circuit diagram and materials to design a 30km range fm transmitter. Thank you | ||
| This is my Project and Thesis subjects. I Your Help. Please Help me to provide information about to Design GSM Transmitter and REceiver | ||
| can i get a some more simpler ckt | ||
| where does it transmit the signal to? | ||
| i would like to learn how to construct a simpler fm transmitter | ||
| Hello everyone,i m trying to make wireless audio tranmitter for my audio system.if anyone have any idea how to make it than plz help ill be very thankful to that persons.Cheers bbye | ||
| pls assist me on the components to use for construction of 20km range fm transmitter.you are the best! | ||
| Can a stero jack be subtuited for the mic? For a Ipod in my cat? | ||
| Looking forward to replace mic with Audio out from pc. | ||
| Thanks ......I am Electrical Engg.........Ckt is easy except I think Inductor's construction is critical | ||
| 27 mhz transmiter & reciver ~4 watt ~25watt thanks ok | ||
| good | ||
| i was crazy for fm transmitter | ||
| i want to know the work of fm transmitter in coden and bringing out sound from fm wireless microphone | ||
| Very Bad | ||
| In place of the mic can we use a NO type push button,so that we can transmit a pulse . | ||
| if i want to make this fm transmitter with a hi power to get more transmitter feet may you teel me all the thing about or to give me the shematic an the layout to this circuit? | ||
| Fm transmitter is illegal in a lot of countries...I prefer to use very low power transmitter.If you want I have a simple schematic project about radio remote control with inexpensive and famous component,without ferrite coil and with a simple air coil.I ll send it on e mail | ||
| Thanks a lot! Will try it out! | ||
| It is very exiting to constract simple FM transmiters. Please would you help me to constract an Fm transmitter with working radius of more than one kilometers? | ||
| just ampify this circuit's signal, and use a big antenna | ||
| hey i'm doing a project where i have to set up a FM transmitter on an 11 acres compound. The transmission should not interfere with signals out of the compound. The land has a building with a height of 38 feet. the width of the compound is 150 m, can i use the same low power transmitter. if not can u help me get one . | ||
| I need a circuit diagram of FM Transmitter having range abour 1Km min. | ||
| could anyone help us to give a block daigram sterrio fm transmitter could reach the highist ranges of 3kilo meters i construct fm transmiiter to swicth my 2 water pump by trigering one pump left chanel and right chanel is for the second pump transmit and received within 3km away. Thanks | ||
| could you pls. help me construct an fm transmitter that could trigger a receiver within 5km range. I plan to use it for buglar alarm. The concept is like this once a buglar is detected it will trigger the transmitter to transmit to a receiver located 5km away. Thanks | ||
| I would like to know how to build an FM transmitter with a range of about 5 miles. I have an antennae capable of outputing upto 50 watts of power, mounted at about 11 metres. If anyone can help, please send to me. | ||
| THANK YOU FOR PUTTING THE DIAGRAM IN THE WEB.I NEED MORE SIMPLIFIED DIAGRAMS | ||
| is really goog to work on, ley me try an see if i can work it out. keep it up guy | ||
| pls send to my email add for your reply....and i will send you the photos of my project if i will finish it....thanks god bless | ||
| how much the volt of C1,C2,C3,C4 capasitor?.and what is the substitution of 5.6 pf capasitor and C5 3-18 ajustable cap?.adjustable cap and adjustable nub are they the same? | ||
| Our group have tried your simple FM transmitter circuit diagram.It did work when we passed the project, thanks very much. Arigato. | ||
| i will like a more detailed explanation, both theoretically and experimentally. | ||
| would it possibly go futher than 400 feet... I'm thinking a couple of miles??? I have a plane of starting a Pirate radio ;) | ||
| For mitshiru.......can you please email me the project photos you were talking about.....i want to do this as a project and need a lil help...ill be very thankful | ||
| I would like to have some information and if possible a circuit on an FM transimitter that can be used to trigger an alarm incase of burglary.Please use the above email address. | ||
| please, ineed more explanation and theory on fm transmitter if possible. i desire to work on it for my project if you can send but the complete circuit diagram and the theory for the success of my project.Please do use my mail box above.THANKS | ||
| EXCELENT!! We did 4 of this, and them works very well ! Arigatou!!! :D If u send me your email, I could send u the pics of the proyect, and the photos of the carrier frecuency of the transmision on the sprectrum analyzer. :D Arigatou! :D | ||
| I was wondering if you could use an adjustable cap with 4-32 pf in order to increase the level of the frequency being transmitted. | ||
| i want to to build FM transmitter circuit thats range is 1km, if anyone know then please send me by mail for FM Transmitter simple diagram pls send me my mail | ||
| Nice it worked well thank's!!!!!!!!!! | ||
| it work very well, i could make it work in 88 - 108 range thanks to the Adjustable Cap. When testing, would be usefull to have a spectrun analizer near to you to check out the frecuency (cause you can get lost). The only problem was the antenna. I tried with a long wire but every time y touched, the frecuency change | ||
| Is it possible to make a FM transmitter for a IPOD? If so, how would one go about making one? | ||
| I am very interested in constructing Fm transmiter and other related circuits. Please, wwoud you help me to construct Fm transmitter with range of more than 3 k.meters? | ||
| Please how much does it cost to own an fm radio station (Editor's notes: A few million...) |
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| hi there my name is cliff jairo am like to know about high power transmiter mybe for 1000 km i beg you to bring to me the circut i hope i get the circut | ||
| I am a student in dhaka polytechnic institute in Electronics Technology.My fevarate hoby is FM band.So give me a full circuit in FM transmision and antina system. | ||
| how to the material to connect the digned | ||
| dumb information (Editor's notes: As useful as your comment.) |
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| brief summary about project | ||
| Hi there I would like to built transmitter by my self I looking for stable and high quality oscillator that I can tune 0.2MHz between channels all FM range so I need synthesizer frequency which companet are you recomanded All regards Aviad | ||
| Sir,, really i like ur dream project..but sir i required 5 to 6 km range fm transmitter can u help me plz.... | ||
| i made it but it doesnt work :P | ||
| i like your work and i want to use it as my final project pls can i get more information.thanks | ||
| This circuit works well,but quality of sound is poor can u suggest any improvement?I cannot recognise spoken words on receiver,i can make out that something is being spoken but what is actually spoken its hard to guess | ||
| good for now but the real comment after it 's work | ||
| I built an FM Transmitter almost identical to this one. It oscillates and I can hear myself on the radio but it is very hard to tune the variable cap because it ranges from 5.5-80pF. Miller's Theorem is a tricky son of gun and can make you go crazy if you dont know how to calculate these values. Miller's theorem basically tells you that there is an internal capacitance between the nodes of the transistor and you have to calculate them to take them into account. If I take it inot account, my variable cap would have a smaller range, like 2-10pF, and it would be easier to tune the frequency. Some advice would be to open a book or search the internet before you just start building something, there is no value in building something you know nothing about. Otherwise you might as well buy it. And trust me you dont need to be a genius to figure any of this out. Hope this helps the ones who are confused. | ||
| Does this work on a radio? (Editor's notes: Um, yes?) |
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| this circuit really works | ||
| Please can anyone tell the full meaning of TX and RX as used in internet radio | ||
| help me telling the IC of fm traansmtter | ||
| VERY GOOD PROJECT | ||
| I made this FM transmitter ditto as given but it failed to work. Not even a bit. All I could hear in a FM receiver kept nearby was background noise, and some sound when i hit one of the capacitors or some other components. My teacher told me that it was due to keeping the components legs not touching the PCB and keeping the gaps shown in the fugure. She even suggested the use of some kind of op amp or some thing to boost the power of the circuit. Someone please help me to build a complete working model of such a FM transmitter. I don't want to loose out on quality to make the design simple and cheap. | ||
| my god! so many silly comments! for nice fm trasmitters have a look at anarchy.translocal.jp and fm.thing.net and http://www.electronic-circuits-diagrams.com/radioimages/radiockt1.shtml and http://tacashi.tripod.com/elctrncs/smplfmtr/smplfmtr.htm | ||
| I WANT YOU TO GIVE ME THE BASIC EXPLANATION ON FM TRANSMITTER [from the input to the out of the cct] | ||
| i appreciate ur work i want to incorporate IC on my cct .HELP | ||
| now iam testing small FM Transmitter its problems is frequncy variable whats the problem ? | ||
| i built it just like it said and it is not working for me. i can tell that it is broadcasting somthing but not what is going in the mic. does any one that has built this have any suggestions for me. i may have screwed up on L1 L2 and the antenna. how did you do those. | ||
| nice, i like this little article, it will help me for making my own radio station. | ||
| I HAVE AN FM TRANSMITTER OF 5KM RANGE OF COURSE I USED IT FOR MY SCHOOL EXHIBITION TWAS WONDERFUL. THANK YOU THIS WEBSITE FER GIVIN ME AN IDEA FOR WAT TO DO FER ME SCHOOL EXHIBITION THANK YOU VERY MUCH | ||
| how does the fm transmitter works if it has.T1 BC 458 | ||
| i just want to set up a large area( 5km ) coverage. how can i get the components. and pls give me some sugestions.. and pls tell me whre can i buy the components | ||
| hi this me . this practical circuit thanks. | ||
| wow this thing is epic i just need to get the parts to make this. this is also good for pranks XD | ||
| It's wonderfull, iam so happy cause this one of kit finally i found. | ||
| its wonderful | ||
| I would like to thank you for giving us the deteiled and basic explaination about FM transmitter. Thanking You | ||
| hello i want to know if that works and how | ||
| where can you by a 3-18pf Adjustable Cap | ||
| Sir, some components I can get them but getting 28AWG enamel coated margnet wire and Transistors 2N2222A npn, or 2N3904NT123A are diffcult. PC Board layout and parts placement are not clear. | ||
| I found ur circuit on this site and then i tried and found a well low range FM Transmitter but I wanna try to made a high range and hope that this will be much supportable for me as it had given me confidence and way of aproch thanks | ||
| where can you by a 3-18pf Adjustable Cap | ||
| I must commend your efforts.Please, can the transistors used in FM transmitter be replaced with IC.If yes,i would appreciated your assisstance on this. Regards, Akonji, PH, Nigeria. | ||
| HELLO I PUT THIS CIRCUIT THGETHER AND IT DID WORK!! I WAS JUST WONDERING IF YOU HAD ANY FOR 900 MHZ RADIO'S? i am 14 years old and i love electronics | ||
| I got all the components expect the variable capacitor.Where can Ipurchase that?if some other technique is avaliable means please tell me that. I am in hurry in completing that project.thank you tell me that soon | ||
| i want to know the functions of the components in the circuit for fm transmitter. | ||
| I have built a small transmitter. now I want to build a corresponding antenna for transmission. Tell me how. I am in Tanzania | ||
| salam the given circuit is very impressive. i need the thesis on this project that how it works. thanks | ||
| sir, i make this ckt but this ckt could not work .at which frequency we receive this signal. | ||
| sir i have read you project i tried to do it but i can not get the variable capacitor c5 mentioned in the list please teel me where i can get ths or any substitute.iWANT TO DO THE PROJECT AND REALLY WANT TO SEE HOW IT WORKS.SO PLZ ASSIST ME.thank u | ||
| i want the parts required to do a fm transmitter | ||
| hello sir give me the the transmiter in block diagram form | ||
| I also want to be able to pick up the frequencies from your transmittor. How do I go about doing that? Can I make a reciever, or can I just go out and buy one? Thanks | ||
| i want to build a FM transmitter which is capable of receiving the audio frequency of any FM radio station. | ||
| thank you for your assistance | ||
| hey, i need a circuit layout for a FM transmitter for no more than 500m. Also needs to have a input to be able to transmit music and other audio, i run a school Radio station and want to go FM. Please help me. or if you have any ideas please tell me as i want something no more than 500m tops..... | ||
| I need to make very small but high range FM transmiter. In spy project so i need help from someone.... | ||
| this is only used in radio? may I use in computer | ||
| I am just getting into "rolling my own" electronics for robotics. I like the easy to digest fomat of your instructionals. I have through self research, learned much about electronics but in the course of doing so would find a part of a concept impossible to understand which would sometimes keep me from understanding it's other dependent parts. I just started reading the article in "howstuffworks" and find they fill in the gaps whether it's a research paper of a schematic. Thanks! Oh and P.S- to those lazy readers who want people to send them copies of special designs to their Email addresses-- HIRE A CONSULTANT! | ||
| POOR outout power,less range | ||
| I want to build a transmitter that can transmit at cell phone frequency range(900 Mhz).Kindly help me with that | ||
| i want to build an fm transmitter for my project can u pls send me materials | ||
| i wanted to construct an FM transmitter, and a receiver that can work effectively over a distance not less than 1km. frequency range 88-108MHZ. can you please avail me with some circuits. thanks | ||
| i got a information how to produce ur own radio station | ||
| i need to built an fm trasmitter for a range to about 1.500 feet can can u assit me whit this | ||
| pls give a reference of FM station proposed design | ||
| Hello sir i am the student of Electronics technology sir i want to recive by my E.mail Adress the new diagrams i have made this projects thank it is working very well!! | ||
| i need a trasmitter that can go way atleast 20miles...Tunde | ||
| i want to built an FM trasmitter and a receiver for my project.can u assist me in the FM receiver part? | ||
| this circuit must work with 3v ,this should record speach | ||
| Pls, i want to construct an FM Transmitter for my project how can you assist me with materials and circuit diagram. Regards, | ||
| let me check its work. but what about a receive... is it a normal radio set ???? pls reply | ||
| Thanks for giving me a clue to my problem. | ||
| i want to built one | ||
| sir i want to create a small fm station.can u send me the data and picture of that | ||
| i want to incease the transmitter supply of 9v to use 12v,so how can i do to meet the requiments of it or to extend it. | ||
| it's too bad it doesn't work (Editor's notes: Yes it does.) |
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| when we made our fm trasmmiter, we able to get two frequencies...how can we overcome this image frequencies....trhankzzzzzzzzzz | ||
| Sir am a student, Can u please kindly send me a diagram for a reciever that I can build to recieve the transmission of this FM Transmitter thanks. | ||
| The analysis about the FM transmitter is quite cool. But how can I increase the range over 400 with 12V power or less? | ||
| pls anyone have FM Transmitter simple diagram pls send me my mail | ||
| I love this. Can you kindly send the circuit into my box and also a report on how a transmitter works. | ||
| Sir I am student.my hobby Trasmitter Making Pls This Circuit and diagram p....ed Dightal Am.Fm Cw Trasmitter Esey Coll And Japaney Transitors Sand me. Thanks. | ||
| Not lookin bad, i have to test it to check if it works!!! Looks cool | ||
| Please send me the circuit diagram of 80watt FM transmitter. | ||
| Haven't tried it yet,but it looks REALLY COOL!! | ||
| excellent | ||
| EXCELLENT | ||
| can anyone tell me the function of the transistors in the circuit???... tnx. | ||
| this is very ba d circuit | ||
| INSTEAD OF C2 CAN WE USE SOME OTHER CAPACITOR | ||
| This circut is the best! My friend and I were unhappy because I forgot the book with directions for the circut. I looked here and I immeditly and found a diagram. | ||
| Can this circuit work to electric gutar? | ||
| How should it be done to be in stereo? (Editor's notes: Can't be done with this circuit. Well, not easily anyway.) |
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| I have designed that circuit of yours and it doesn't work. Can you tell me why it is so? (Editor's notes: Post your question on the forum. Could be anything.) |
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| i think use of this ckt should be elaborated a bit in context with remote control toys. how fixed frequencies are transmitted by press of diff buttons. mic of no use there. plz reply (Editor's notes: That would be an entirely different circuit, must more complicated. This transmitter is a simple transmitter used to transmit audio only.) |
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