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| Home > Circuits > Other > Simple Lie Detector |
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| Here's a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. It is not as sophisticated as the ones the professionals use, but it works. It works by measuring skin resistance, which goes down when you lie. |
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| To the person asking that a "how to build this" video be sent to him: (prince-something was username)... Dude, if you cant build THIS circuit, (which by the schematic you could almost thumb-twist together) maybe you should consider NOT going anywhere NEAR ELECTRONICS, OR ANYWHERE you could hurt yourself or others... In other words, ask George to tell you about the rabbits..! And dont leave home without wearing your helmet!! | ||
| can we use digital meter in place of analog??? | ||
| please am finding it difficult to build this circuit and i need your help by sending me a video tutorial of how to build the simple lie detector.hope my request will meet your kindest consederation | ||
| yes, this is the really very nice project and i made also.. its working bindas.... | ||
| Dear Sir or Ma'am, I would like to ask if the pointer of the analog meter goes down when somebody lies or is my analog meter the problem? Also, when it is being tested, does the meter have to move from 0 then so on or from any number as long as it moves then it is lying? please reply asap. i need thisproject two days from now :( | ||
| is this really works if yes plz mail me back coz i wana do this project | ||
| I want to ask about how does analog meter works in dis lie detector?? | ||
| ARE THE 4.5V IN THE DIAGRAM BATTERIES ? HOW MUCH WE NEED TO GIVE THE POTENTIAL VOLTAGES | ||
| i am a BTECH 3rd year student .i want to submit this project in my college as a minor project so please give me it's complete information project report and pdf file .please send as early as possible we have a limited time.thank u .................. | ||
| AHEM. Professional lie detection examiner specified "ask yes or no questions only" by preparing brackets (sets) of questions ahead of time | ||
| I did not find the transistor of that you said. He i try any other transistor what would be the circuit | ||
| yes i made the circuit and its working well. | ||
| its wonderfull.not only this the superb collection of all the stuff.its just amazing! | ||
| is there a kind of lie decetor where you do not have to hook in wires and painless? | ||
| i want to do this project.is it works only in a tenssed condition?when you saying lie to test this is it work? | ||
| I am searching a topic for my school exhibition and this one is the perfect | ||
| is this really works????because i couldnt get the specified transistor is thre any alternate one ?pls help me | ||
| I am a BTECH 3rd year student . This time i m in a govt. company for training & i really impressed by this project so i decide to make it. I want to submit ths project in my college as a minor project . So plzzz give me it's complete information , project report and pdf file. Thanking you | ||
| Are the 4.5V in the diagram batteries? I tried this circuit and it doesn't work, so i'm looking for potential mistakes from my part. | ||
| well if that is the case where the body has a type of resistance then can't a ohm meter work just as well as the meter being made? (Editor's notes: Yep.) |
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| can a simple speaker connected in the place of meter ? | ||
| Hi. Can the Analog meter be replaced by something else? | ||
| can LEDs of green & blue color be replaced in place of M1.If yes then how would be the circuit arrangement? | ||
| Questions: R1 is a simple 33K or 3.3 k resistor? And what is R2? a simple 5k resistor? | ||
| How this circuit works: This ciruit works by detecting changes in a person's conductance. Our body always conducts (n) degree electricity, and when there is moisture (sweat in this case) -- this degree of condcutance increases. When a person is lying, their body produces sweat, and this circuit picks up on this. This circuit could also double as a liquid detector too. | ||
| Does not work... | ||
| cant you have an explaination to the cct. on this page too an dhas anyone tried and tested this one yet? | ||
| how this lie detector works without LED's | ||
| can we replace 2n3565 by 2n3522 ???????? | ||
| Does the M1 meter get adjusted for each use or do you adjust the R2? Also is M1 needed or can you just replace it with LED's for indication? | ||
| I maid this project but it does not work.Please tell me how does it really work. | ||
| Can you put step by step directions on how to build this or can you send it to me in an email because i am building a lie detector test for science fair and i don't understand this picture (p.s. i'm only in 8th grade). So can you please do me a favor and simplify this? Thank You | ||
| should have seen this much more earlier | ||
| is the analog meter AC or DC | ||
| Can i use 2N3904 instead of 2N3565? | ||
| this lie dictator is looking awesome.... but it's very baaaaaaaaaaaadd........... | ||
| i wanted to know whether i can place red/green led's in the circuit to indicate a lie . please reply soon .thanx | ||
| what is the use of transister in this circuit? plz explain shortly the operation of the circuit why v have introduced the VR2, transister and two source voltage instead of one 9 volt.?? | ||
| Hi, Is at all possible to incorporate a green and/or red LED in the circuit? So say you ask a question and its a lie the LED lights up. I am new to electronics so where would I place the LED? Thanks Mike H. | ||
| oh yeh that;s working superb | ||
| i tried this project,but it is not working.lie detector tells lie. | ||
| It works by recording your blood pressure, heart rate, and sweating. | ||
| it is such a nice project but i want to know it's working .i want to build this.the alligator clips used in this,are they very painful.please give me answers as early as possible. | ||
| wow!amazing!we want to try!!!! I think it will help us do our science investigatory project!!!! | ||
| can u explain about the disadvantages by useing lie detectors ara really effective..........? | ||
| Its just a simple and effective project.But can i able to know how to assemble the project with picture presentation. | ||
| it will be great if the circiut is efficient | ||
| no question about the simplicity.but is it accurate | ||
| Why go through the trouble of making a lie detector? Their are plenty of resources out their to help you catch liars by certain techniques. Check out www.humanliedetection.com it has a bunch of different techniques you can use. It is a much better alternative then actually hooking someone up to a lie detector. | ||
| it doesnt work it's a load of bullshit | ||
| I would like to know how a lie detector works because i have no idea if they work or not, some people say that its skin resistance and some people say that it works by your blood presure??? (Editor's notes: This works on skin resistance.) |
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| does it work.has anyone tried it? | ||
| want to kno how to make it? where it has to connect? is it pain ful or not? any chances to get electrical shock when it connected to the body? is it make any problem to the inner organs? | ||
| Hi there can you put pictures of the result of a built Simple Lie Detector, what it looks like in detail step by step results till the time it gets completed. | ||
| thank you I think it will be amazing project when i try to design it | ||
| the stuffs seems expensive... how much does the whole thing cost?? | ||
| i want to know that when probes are connected to hand does it effect any organ or whether there is an electric shock | ||
| For all of you asking for a how to build this guide: If you want to build this i suggest you learn how to follow a schematic to build an electronic device. | ||
| hey im doin a lil project for my electronics program. i gota take a circuit off the net and make a bussiness proposal. i like the idea, jsut wondering if you could give me some better specs and details. im new to this..anything would be appreciated thank you | ||
| Exactly how are you supposed to build this thing ? any instructions or directions ?
can i use a digital multimetre instead of an anolog metre ? (Editor's notes: Read the schematic above and assemble.) |
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| WHERE CAN I GET THE STUFF AT? | ||
| sooooo nice thank u so much........ | ||
| it my mum having an affair. (Editor's notes: Yes.) |
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| want to kno how to make it? where it has to connect? is it pain ful or not? any chances to get electrical shock when it connected to the body? is it make any problem to the inner organs? | ||
| COULD YOU PLEASE SEN ME THE DATA SHEET OF EACH COMPONENT FOR THIS CIRCUIT THANKS! | ||
| This cant be true ! This simple thing shows you the lies of anybody ? | ||
| I've noticed that a lot of students want to do this for a project, but they do not seem to have even the basic knowledge of how circuits are built or even the components involved. I wanted to do this for a project, but it only contains one transistor and I needed at least three. So, I went with a Schmitt Trigger Oscillator. My prof. was right -- I am at the best school to learn electronics.....lol | ||
| does it need to be an analog meter? can you use a digital multimeter? | ||
| Guys, learn to read. It clearly says R2 is a 5k pot. which is pretty obvious from the schematic anyways. I have everything I need for this except the meter, once I get it, I'll see how it goes! | ||
| it really works i have tried it (it is actually an conductivity meter) it tells that your lying because when you lie you sweat and salt water conduct electricity beter | ||
| I would like to repeat what the editor said: any small npn transistor will do. I tried 2N2222 and it worked fine. It worked, but i used a 0-100mA analog meter so it's difficult to see the change when someone lies. I'm from the Philippines and the whole circuit cost me more or less Php100 (it would have cost less if I searched the my whole city). One more thing: the lie detector only works when someone feels the NEED to lie, like when someone's reputation or life or something very important is at stake. I would like to send my kudos to the genius who made this. This is my first electronics project and was just done making it. | ||
| The three components of a lie detector test are perspiration, heart rate, and breathing. This contraption along with a telemetric band (like the one you buy for jogging at a sporting goods store... as seen in the new Incredible Hulk) would address two out of the three factors. Remember also that it is critical for your subject to believe in the accuracy of the test. There are some techniques available online in respects to that. Enjoy!! | ||
| What is r2 how can we make this liedetector not painful? t is needed to have a 2 supplies...?? how will it make..??? | ||
| http://en.wikipedia.org/wiki/Polygraph#Reliability
If you want to use a lie detector to see if a relationship should continue, the relationship is already over. (Editor's notes: Bingo.) |
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| In making this lie detector i used a 2n4401 transistor and the detector didn't work. I'm thinking would it be due to the transistor. Can i use 2n2222 instead? | ||
| i am trying to make this for my schoool's science fair.Will it really work work?as i don't want to spend my time on trash | ||
| whot is R2 and send me the full detail of how to make the lie dtector | ||
| how can we make thisliedetector not painful? (Editor's notes: It shouldn't be painful.) |
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| it is needed to have a 2 supplies...?? how will it make..??? | ||
| in the R2, is this a 5K variable potentiometer?? | ||
| i couldnt get that transistor(2N3565) can anybody tell where did it get? | ||
| Great. Is 100% sure that the device will work? thanks for the reply | ||
| of course it works! by sensing skin resistance what your really sensing is how much your victim/subject is sweating something liars do often. skin conductivity is actually one of the things professional lie detector units measure. along with heartrate, breathrate, etc. | ||
| who knows any other equivalent transistors to that one. its hard to get the specific one. the circuit is not that hard, if u know about the subject. ill try it soon | ||
| hi to the inventor of this circuit thanks to show us this diagram.. i like this thing and i want to do this asap. | ||
| what is r2? | ||
| fuckin sweet it works | ||
| Can anyone help me build a circuit to capture UFO sound waves, so I can listen to what they talking. | ||
| wow THIS LOOKS AWESOME. Are you sure it works | ||
| where do u get the parts from | ||
| hola !!!! senor bobo here this lie detctor is easy to build (if you know someone who got their degree in mechanical engineering) | ||
| lt is so simple. What a thing | ||
| could someone verifie if this realy does work because i can't believe its this easy | ||
| I am helping someone build this circuit for a school project....we are changing the parts as someone on your message board suggested. I cannot get it to work.....HELP Thanks | ||
| can any one help me in building the EEG circuit for capturing the brain signals . | ||
| this is so good. but i cant find the specific transistor. can i use any other one. please guide me | ||
| I would like to build a circuit that would respond (sound or light) to my Alpha, Beta and Theta brainwaves. Does anyone know of one? Thank you. | ||
| it isgood please send me more information | ||
| i cant believe its so simple. im gonna try to build it, but im not sure i can get that specific transistor. is there any other type i can use? | ||
| kalyan: EKGs use stick on electrode pads. Some attach very similiar to alligator clips. | ||
| Nice to see such a lie detector which can be built in a few minutes. I'll also try to make it. | ||
| does anyone know where to find the instructions? please, and thank you!!!! Im desperate! | ||
| building it for a sciencefair project and it has to work | ||
| you have mentioned to use electrode pads like they use in hospitals.cant understand how to use that.please explain | ||
| hi..I am in India at tamilnadu ,I was unable to get 2n3565 what could be the substitution for that..please do reply as am interested in etsting this | ||
| can anyone elaborate on this lie detector. How well does it work? | ||
| I just build it today, and it worked gr8...I did however change a couple of things. Instead of the analog meter, i used an LED which lit on when the person was lying. When u make the electrodes touch each other they should light up. I also used a 330 ohm resistor instead of the 1.5kohm resistor in order to make the LED brighter. Also, make sure that the person's hand is super dry before they are tested. I don't believe you can get shocked from it, every1 that tried it out 2day had no shocks..i mean it's only 5v. | ||
| Thats cool i might try it some time! | ||
| passing the test, well just convince yourself you're telling the true. The wall recked the car not me. also cool, good job | ||
| how it is work? | ||
| There is possibilities of getting shocked | ||
| please explain how this circuit works? | ||
| is there anyway to pass the lie detector test if you are lying? | ||
| Studied the electronics for years and i see that provided the skins resistance drops then the circuit could have worked... It can easily been fooled... Ohh and smart move placing an analog 0-1mA meter there i've seen a few placing a pc speaker.. however it is not easy to find such an instrument everywhere...anyway good job there | ||
| hey i have a little question: i can't find any 0-1 mA Analog Meter, could i do any modification an use a 0-100mA analog meter and if that is possible can you what spares i should buy and th way i should connect them? | ||
| we want to do the project.can we rerally spend money and time on it. | ||
| interesting...but the instructions are kind of confusing | ||
| Hello...Tanks for the simple model. The principle involved is changing resistance thats nice, I am looking for an cicruit that works with the changing heart beats...please let me know if you have some thing like that.... | ||
| intresting | ||
| OK, For 1 who the heck thinks this is SIMPLE?? You MUST be an idiot to think such a thing. Seriously. Come on who wants to spend precious life on this crap? (Editor's notes: Anyone with rudimentary electronics knowledge can assemble this circuit in a matter of minutes. Seems simple to me...) |
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| Guys, Does this really work Wont the skin resistance change while ther are athor problems like fever etc | ||
| What happens to our skin wen we tell lies? I am not cleared pls explain to me. | ||
| I build it but it seems that it takes a lot of stress to make the potentiometer to react. Is there something that could be done to test it? Like inserting the electrodes in some substance or something w/o damaging the circuit? | ||
| Very Nice. Simple circuit, but it obviously works! | ||
| When was the Lie Detector invented? | ||
| this is really a superb project.can you tell how this circuit works | ||
| will this project really work?pls tel me... | ||
| We have had a hard time finding the Analog Meter & the 2N3565 NPN Transistor, and the capacitor. I have looked at Radio Shack. What are the best items to cross reference with as well as substitutes? | ||
| I tried to use this on my wife and I electricuted her! My lawyer says I have to cite your notes in court later. Thanks a heap! P.S. Turns out she may have been telling the truth about drinking all the milk. | ||
| where can I buy these ciruts and the other materials to make this and how much are they? | ||
| hi please send me procedure how it will work i am a final year student doing project pllz help me or do project for me plzz i will pay you | ||
| plzzz.....guys......seriously tell me does his really work???? | ||
| Is that our skin resistance changes only when we lie? even our other expressions may cause the same isn't it! then how could we say the other person is lyeing,is that because his skin resistance has changed? Please clarify my doubts....its very interesting | ||
| plzzzzz do this circuit really work properly or not plz anyone answer me | ||
| i realy like this project and i want detail of this project with some ckt deyails. | ||
| its really superb.. i am expecting 4 such a one.. can u plz give d substitute components 4 the circuit.. can u give some tips 2 do this.. plz mail me as soon as possible.. plz.. | ||
| Gina: It would still work, the wattage doesn't change anything here. All the others: You should read something about electronics, understand how they work, how to build a simple circuit, how to recognize the components (Resistors, Capacitors, Transistors, LEDs, and all the others). After you do that you'll be able to build this... | ||
| Thank you for the project help .... this has been a very usefull tool on helping me move forward to the completion of my project though I greatly appriciate the idea i would like to inquire to if you could display a picture of the end reult of the "build it yourself" polygraph. Thank you. | ||
| Hi i want do this project will you please how this ckt will work. | ||
| I want to know how you do it.can i have the video how do you do it? | ||
| hey..its gr8...but can u plz send me the steps of how to build one!...because in our experiment we have to BUILD our own..so PLZZ .send me the steps as soon as possible..i would really appreciate it..thx alot | ||
| hey i don't quit get it!! can you maybe make me one then i will pay you? | ||
| I Think when I tried it it Was Utterly Useless Therefore I Don't Reccomend it | ||
| Gina - you can just about always use a higher wattage resistor in place of a lower wattage one. So yes, a 1/2-watt one will work if you have it instead of the 1/4-watt one. | ||
| hey i am using this lie detector circuit for shaadana mini project. thank you very muchfor providing this | ||
| what are the steps in making lie detector cause we need it for ou science project??? | ||
| hey, i'm making this lie detector for my science fair project this year..i wanted to know if it was an easy thing to make..and if they were certain steps to follow before following the diagram...let me know as soon as possible..thanks madelaine | ||
| Where do i buy these products? If we use a 33K 1/2W Resistor instead of a 33K 1/4W Resistor and a 1.5K 1/2W Resistor instead of a 1.5K 1/4W Resistor would it still work? pease get back to me asap! =] | ||
| i want this project for my science fair ,but i dont know how to make it,,,and i want to know ..is this project expensive???? | ||
| I am really interested in trying this experiment could you tell me where I could find the materials and how to put it together!!! E-mail me back a.s.a.p.!!!!
Thank you,
Erika (Editor's notes: Electronics store.) |
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| Hi, im doing this for my science fair and i printed out the page thinking that it would tell me how to make this and it doesn't so if you would plz send me the information on it that would be VERY helpful. plaese send it A.S.A.P pranav | ||
| can i have mor instructions for the lie detector?? | ||
| how it works plz tell me? | ||
| PPL READ THIS. he is no longer answering to emails so there are no directions or anything so STOP asking him to send you stuff. i learned the hard way. there is no info to send, the pic is the directions. Sorry, to say no wait write hahaha | ||
| i think u can do better than this for a science fair. | ||
| please i would like to know how the circuit works from beginning till end......it would be of great help to me | ||
| its working | ||
| sir,i have already prepared it but i dont have any idea about the working of circuit can u plzz explain how it does..also the use of transistor that too why only npn and pot. | ||
| Hi, im doing this for my science fair and i printed out the page thinking that it would tell me how to make this and it doesn't so if you would plz send me the information on it that would be VERY helpful. Please send A.S.A.P, Caitlin | ||
| i really need a good invention for school!!! | ||
| i have done it but he dindt work :( | ||
| Please may I ask you to add a section in all your circuits which does the actual explaining as to how the circuit works. I mean what happens from input to output. I'm sure a lot of viewers would highly appreciate that as it would be detailed and educational. Kind Regards. JOHN M. DLAMINI. e-mail: | ||
| Hi....Found nice and easy...please send some guidelines on this. | ||
| This is really great. This would be really good for a science project testing which gender is a better liar. So it IS doing my own homework, because I'm not finding out HOW to make this, but WHO is a better liar. Awesome! I love this site! | ||
| Typo in parts list, 'see nots' should be 'see notes' :) Other then that, good circuit. Shame your target has to co-operate for it to be of any use :p | ||
| please help me...where could i find the analog meter and the 2n356 npn transistor? it couldn't be found on this earth especially in the philippines,. | ||
| My friend and i are entering a sci cair next year and we want to get a head start on it now, i was wondering if you could send me the "how to put together" part of this. This is if you will allow us to use this design, we will give all due respects to you. Please get back to me ASAP. Truely Lone Wolf | ||
| Send me the theory PLEASE!!!
I am thinking of a project in school
Its Urgent!!!!!! (Editor's notes: Do your own homework.) |
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| Hello! This project seems very interesting, and I would like to know more about it. Could you please send me a full analysis of this project, and step by step instructions? i mean the circuit desription and working,etc. i have to explain a ckt to my class by this week and i chose dis ckt so could you PLEASE giv me all the details as fast as possible Thank you so much!! (Editor's notes: Do your own homework.) |
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| This is cute. I hope no one actually believes that this or any other machine can detect a person's lie. For all you students, build the circuit and perform some double blind studies and test the theory that skin resistance changes as a person lies. Then goto https://antipolygraph.org | ||
| awesome~! | ||
| on all questoins for steps its very simple get to google and look wich parts you need en get them make it 2 one and get 2 4.5 volt batteries or 1 9 volt batterie | ||
| I want the detailed description and working of Lie Detector. I am keenly interested to work on this project. So please guide accordingly. | ||
| This is stupid 'cause we'll have to do this at home for school. This sucks! | ||
| i need help i want to use this for my project but you don't have the steps on how to create this machine please e-mail this info if you have it. thank you | ||
| hey cool goint to try this on my kid as he tells loads of lies always says he is good at schol gona find the truth now | ||
| i need the full description of the circuit and its working etc i've got to explain a circuit to my class by the end of this week and i've chosen this circuit of urs so PLEASE giv me d details as fast as possible PLEEEEAAASE..... | ||
| Please send me a full instruction regarding SIMPLE LIE DETECTOR. I am interested to make this project. Hope you will RPLY to me as soon as possible THANX a lot... | ||
| Hello! This project seems very interesting, and I would like to know more about it. Could you please send me a full analysis of this project, and step by step instructions? i mean the circuit desription and working,etc. i have to explain a ckt to my class by this week and i chose dis ckt so could you PLEASE giv me all the details as fast as possible Thank you so much!! | ||
| I love the idea of the experiment! I am doing a science fair "Crime" project, YEAR 2, and I am undergoing all the fields of forensics investigation. Can you please send me more information, such as step by step instructions on building this lie detector. Thank you very much! | ||
| Could you please send the theory behind to me.....i'm thinking of a project in school | ||
| hi i just wanted to have the details to this project, like how i would put all these things together, where to get them, etc. i really want to use this as a project so if you can please e-mail me back i would really appriciate it!!!! | ||
| helo.. can you mail me the details of the project?? | ||
| I love it!!!!!!!!!!! I had a teacher who boasts about clinbing Mt everest and she did'nt come to school in three weeks!!! | ||
| I want to buy this already done, can you make me one cheap ? 30 to 50 dollars and ship it to me ? awnser to my email, thanks | ||
| I have a thought I want to share with you. I would like to see someone like you get a grant or backing from some coporation so a high quality personal hand held lie detector could be developed. Hopefuly this device would be affordable, just think of the demand for this product. I have no doubt it would change the world as we know. I think everyone in the world would agree honesty has left the planet. Let's bring it back. | ||
| Hello! This project seems very interesting, and I would like to test it out. Could you please send me a full analysis of this project, and step by step instructions? Thank you so much!! | ||
| I went to Radio Shack and couldn't get all the parts to make the lie detector. I don't have a background in this area so I couldn't even guess what to substitute! Please help! Thanks! (Editor's notes: Radio Shack is not an electronics store. You need to go to a real electronics supplier. Check the yellow pages.) |
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| What is so great about a lie detector when it doesn't work!!! | ||
| I want to know how much it would cost for the parts for this lie detector. I am trying to put one together for marriage purpose. | ||
| can u please send me the detail to this project as i can use it as an experiment and what is the pot ???????? i m waiting for ur reply i want to make it urgent. | ||
| hello sir,i m d student of b.tech final year.we wanna make dis project as our engineering project.we actually want deep knowledge about dis.for ex-will it be really able to catch wen a person is lying becoz some times swatting is not happen much wen a person is lying.so at that time if we r not able to catch the lier? | ||
| Simple Lie Detector-i wanna do tis as my assignment work,so wud u please mail me d full analysis about this project?thx | ||
| Is this accurate? And can you please send me a step by step guide? thanks :D | ||
| hi! i just want to ask how accurate this detector is and can you give me the documentation of this project, i just need it badly.. thank you so much... | ||
| What is a pot? | ||
| i wanna do tis as my assignment work,so wud u please mail me d full analysis about this project?thx. | ||
| sir,if this ckt. will not work,then it will have very bad impression on the examiner. then what should we do?? | ||
| hello sir, can u plz sen me the full analysis of this project that how to fix all this circuits in which ways..thnx a lot | ||
| Cool, I'm gonna make it! | ||
| I am not to electronically literate if you could email me step by step instructions on this I would really appreciate it i guess in maybe la men terms if that is possible. | ||
| Please, plz, plz, Sir, give me details because i'll become PhD with this in India...can you imagine, a savant !! | ||
| i want to do it as my project.please explain the working and what is pot.what is aperson does not sweat?under thios condition will it be unsuccessfull? | ||
| can you please send me the details to this project so i can use it as an experiment | ||
| how i make a simple lie dector working from skin resistance for science exibition at school level? please reply in 3-4 days | ||
| Is it really working? I want the explanation. If the reader(YOU) knows about please send it to my mail id THANKYOU | ||
| This project seems interesting, a bit much for my simple minded self, but alas I'll give it a shot. Thanks for keeping this site up, helped a lot in picking a project, but I think I'll add and change a few details to make it even more interesting. --Thanks.-- | ||
| sir even iam planning 2 do this as proj so can u pls tel me hw does the ckt wrks | ||
| can u pls send me d details of this circuit m thinking of doing this as my final year projects.pls include tis working n all...pls mail me.and . can you please send more details regarding the circuit layout on the pcb,cost for making , nmore about its working and about analog meter. | ||
| Can the BC548 be used instead of the 2N3565? Can I get the details of the circuit please? | ||
| hey i hope this lie detector behaves like the one i saw in the simpsons. | ||
| it is so interesting to i want to this as my project plz... give the analysis of circuit and working of this simple lie detector | ||
| hye i wanna do tis as my assignment work,so wud u please mail me d full analysis about this project?thx. | ||
| can i know,how this ckt working sir? | ||
| what is a pot ?? how do you set up the 4.5 batteries? | ||
| this is a wonderful project. can you please send more details regarding the circuit layout on the pcb,cost for making , nmore about its working and about analog meter. | ||
| how should i present technical paper on Lie Detector? | ||
| can u pls send me d details of this circuit m thinking of doing this as my final year projects.pls include tis working n all...pls mail me | ||
| the concept is nice but ithink it's working is somewhat difficult | ||
| I WANT TO DO IT AS ACADEMIC PROJECT. PLEASE EXPLAIN THE WORKING | ||
| hey can u please mail me the analysis...i wanna do this project in school....thnx....my address is karanyshah@hotmail.com | ||
| sir, i want to know details about lie detector for preparing a seminar on this topic. | ||
| tis is a wonderful project. can you please send more details regarding the circuit layout on the pcb,cost for making , nmore about its working and about analog meter. | ||
| How much rilayability,accuracy is there? | ||
| Sorry about the simple questions. Will a 5K Horizontal Adjust Trimmer work for R2 (5K Pot)? Also, Can I use a 1uF 50V Radial Electrolytic Capacitor for C1 (1uF 16V Electrolytic Capacitor)? Thanks. | ||
| i want to do this experiment in my college.so could u please explain this project for me | ||
| can u send the analysis for me | ||
| i found it good and i m planning to work on it........... | ||
| is the difference in skin resistance enough basis in telling if someone is lying or not? please explain | ||
| explain about the project working principle | ||
| I will try it if it works Than it will great thing and cheap | ||
| very good | ||
| how do you make a lie detector | ||
| explain how it works....??? | ||
| does it really works in police departments??? | ||
| tell me about lie detector | ||
| works well | ||
| hurmm....it's very nice. but it is a familiar thing... | ||
| For those that ask how to put this togeather, Purchase breadboard, this is non printed circuit board that you will be able to soldier the parts to, Solder the parts as shown in the diagram, space the components out and use small pieces of wire to connect them, each component should have two pieces of wire (prongs) sticking from it. insert the prongs through a hole and soldier a prong to an end of wire then soldier the wire to the next components prong. (when the two prongs of any component connect in any way they become a completed circuit so do not let them touch and do not soldier them togeather.) when you have connected each one to the next component then close the circuit by connecting the last part to the first. | ||
| can you explain the block diagram too?? | ||
| Does it really works? | ||
| i had done a project regarding lie detector,its working in efficient way | ||
| can any one tell me about the working principle of the lie detector?? | ||
| I want to know no/ ident of transistor | ||
| where do i get parts? | ||
| Where do u get the parts from?? | ||
| thank you very much and i hope that your every wiches will be done but i want more information | ||
| simple and honest. | ||
| it is wonderful. | ||
| it works very better than you!!!!!!!!!!!!!!!!11 | ||
| Its very wonderful | ||
| its good .bit there is no note how to make it. | ||
| its an awesome website .you can create whatever you want. | ||
| what's the real name for a lie detector (Editor's notes: Polygraph.) |
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| DOES IT & HOW DOES IT WORK? | ||
| i think it is neat but it doesnt work for me just everyone else??? | ||
| I DONT KNOW HOW TO MAKE IT | ||
| it is woundeeeeeeeeeeeeeeeeeeeeeeeeerful | ||
| I built one and its fantastic..... I put in a little electric shock when they were Ive tested so many people you wouldnt believe how good it is! | ||
| What is it about these forums that they attract all the weirdos? I have never seen such ridiculously stupid questions! I mean throughout this entire website's forums! Just riddled with stupidity! | ||
| This lie detector sounds great but where do you get the stuff, where? I haven´t tried it yet but it probably works | ||
| it does not work at all | ||
| woah...so me and my friend think this is super cool! but like where do you buy the supplies? they don't sell thart stuff at the mall...i've checked.is it like on the black market? k thanks! | ||
| can I get all these parts at radio shack? | ||
| this should be easy enough its one of my first projects | ||
| interesting | ||
| it doesnt work it sucks | ||
| that is very intersting project. | ||
| Its fantastic ,it will help me alot am yet to prove u right. | ||
| im taking a lie detector test shortly and always have suffered from sweaty hands for no apparent reason iv been docs about it yet told there nothing to worry about would this be a prob in lie detection case as im telling the truth | ||
| if this can work it will save me a lot from cheating buddies.pls send me clear procedure | ||
| it works trust me | ||
| WOW!!!! I hope this works..... | ||
| me and m friends are doing this for a science project its going to be so awesome | ||
| If all you have is 6v and you need 4.5 volts diodes in series drop it .5 volt. 3 diodes in series equal a drop of 1.5v. 6-1.5= 4.5v approx | ||
| plz,the meter seems to keep moving,i dont know y,so plz email me for some info,and should the questions bo annoying and hard or normal things.thanks very much. | ||
| I really didnt believe that there are such BIG FOOLS out there who actualy think that this 'lie detector' is gonna find out if their boyfriends or girlfriends are cheating on them or whatever else!!! Come on people.. It works on the principle on basic conduction. If u sweat, its gonna cause a change in skin resistance which indicates that you are 'lying'. there is no gurantee that the person actually is.. it might never change for one thing.. and even if it does, it might just be that the weather is hotter than what it normally is!!!!!!!!!!! | ||
| does it work? | ||
| does it really work?????????? if it does can u pleaze send me the perfect procedure...... | ||
| Were are the lie dectors? | ||
| We made the lie detector but it reacts to low resistence. Why not higher resistence and it doesn't seem to react to your skin very well. What could we do? please email me back asap i need it for a science festival | ||
| It has a 90% chance of working (or actually 25) it was very difficult so i changed it a bit i hab no 4.5 batteries | ||
| But does it really work? I don't know whether you are telling the truth. Please would to attach yourself to it and show us the results. Thanks | ||
| will there be a lie detector tester that is simple enoughfor kids to make? afordable and easy to find the materials? | ||
| please i am so mch interestd int knowing about this project, so i was just wondering if i can get more information on it .thanks | ||
| I would contest the term useful; the effectiveness of the "professional" lie detectors is contested. So I wouldn't use this to decide who's your friend/ex/etc. Also make sure those input voltages are 4.5V and not mains; it's a lie detector not an electric chair.... | ||
| How could one make a simple lie detector? because i'm contemplating to make one for our science investigatory project this grade 10...thanks | ||
| Hi my name is Cassandra, 20 years old. Im a straight forword young lady that doesn't lie im starting to have a relationship with a 22 year old young man. i wanted to know if he lying to me because some of his ex girlfriend told me that he as a child and when i ask him he denied it his not telling the truth but i really want to get the truth out of him. Because he ask me alot of question about my personal life i tell him the truth how should i make him tell me the truth and he can't bearely look through my eyes he always look away. to me it seems that he not telling the truth. think i should take a trip to THE LIE DETECTOR TEST the only way i want to find out if his lying to me by trackin him when he called me so i could know if he lying to me PLEASE I NEED YOUR HELP OR AN ADVISED | ||
| i think my girlfriend cheated on me but she says she didnt and she swaers she didnt but i saw her sneaking out of sum lads house and i dont know 2 beleave her or not. so cud u plz plz tell me if this rly works cuz if it does i will make it and see | ||
| it would be nice if you could give the procedure of building the lie detector | ||
| "hi my name is John and i have a question I have been to cort the reason because a young girl acussed me of doing something i didn't do and i am saying the truth about everything that happened that day but she lies in cort. I come from a very cristian family and my parents thought me not to lie so I always say the truth, Well my question is if its possible for me or her or both of us to have a lie detector test done to prove that I am inoccent.So I wanted to know if there is a way to prove that in cort and how much would it be so i can get a lie detector test in cort. Can you please let me know as soon as posible thank you so much."...I actually believe you didn't do whatever you are being accused of because I don't think you are smart enough! .If I were you, I'd learn how to spell and properly speak ASAP! (Editor's notes: OK, enough of that, children.) |
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| its not working | ||
| hi my name is John and i have a question
I have been to cort the reason because a young girl acussed me of doing something i didn't do and i am saying the truth about everything that happened that day but she lies in cort. I come from a very cristian family and my parents thought me not to lie so I always say the truth, Well my question is if its possible for me or her or both of us to have a lie detector test done to prove that I am inoccent.So I wanted to know if there is a way to prove that in cort and how much would it be so i can get a lie detector test in cort. Can you please let me know as soon as posible thank you so much. (Editor's notes: Have your lawyer demand a polygraph test.) |
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| My friends and i are doing a project. We are building a lie detector and need to know what size resistors and transistors we need. I would appreciate it if you could try your best to help us. If you can't, thanks for looking at this letter. Sincerly, Curtis Crow | ||
| 2N3565 NPN -> 2N3567 it's the same | ||
| LOL! Honestly (if you'll pardon the pun) they don't work. There has never been any scientific evidence that Lie Detectors of any kind are more than about 60% accurate - and that's when the subject is being thoroughly interrogated. 60% accuracy is no higher than an interrogation WITHOUT the aid of a polygraph. | ||
| Please tell us how it really works Thank You very much | ||
| I LIKED THIS CIRCUIT VERY MUCH.IT IS VERY SIMPLE. I AM GOING TO MAKE IT. | ||
| can i know about this project in detale | ||
| How do you set the electrodes? I tried to measure the skin resistance using high sensitive Ohm-meter But I do not see any convincing changes. Do you set the electrode at the finger tips or at the back of the subject's hand. But the back of a hand is very high in resistance...almost non-conductive. | ||
| I think its too hard to build...I mean, who know's what a 5k Pot is? | ||
| i know all the info i would just like to know how to build it if you could send how to build it that would be great thanx | ||
| What can you use to replace the 1.5K 1/4W Resisitor. Also can you help us to build this machince | ||
| hiii... i m student of IC engg. 6th sem.. i want to do this project as it seems very exciting and something new... but the comments here show that it is very unpredictable.... can u plzzzzzzzz guide me about this project??? thanking u... | ||
| The transister 2N3565 is short in the market . have any substitution. any one having better comments PLZ mail me will be very THANKFULL. (Editor's notes: Any little NPN transistor.) |
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| how do u write up a science fair project for it like the hypothesis and etc... | ||
| how do you kwow when someones lieing? when its going towards the poxitive or negitive on the meter? | ||
| have a few questions that I hope you can answer:1-Does the transistor have tp be exactly the 2N3565 NPN Transistor or would any similar NPN do? 2-In your schematic you have 4.5V batteries drawn. I canot figure out how to incorporate these into the project-any andvise? 3- Do you have any more detailed explainations on how to make this work? Thank you | ||
| I love lie detectors!!!!!!!!1 | ||
| There was no problem making it. But I'm not sure about the sensitivity readings...Might need much better electrodes. I get a a difference with wet fingers but not with any lies. Any ideas? And for you other guys with questions. Parts can be found everywhere, most electronicsshops in town or online. Swedish company www.elfa.se has alot. I don't know about the transistor but I used another NPN one. | ||
| I tried building this circut. Never did have any luck tried 5 times. If anyone is able to build it and make it work let me know I would like to talk with you. Good luck. (Editor's notes: Search the forum. Lots of help there.) |
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| I would like better directions on how to build it plaese | ||
| I'm making a lie detector for a science project and i need a little more help with putting it together. Could u email me back with detailed directions on how to put it together. THANK YOU!!!! | ||
| can u pls give a clear idea in doing this project.coz i'm an engineering student n i want perform dis one in our exhibition. pls do dis favour for me. | ||
| Hi, Can I replace your meter with a red and blue LED? Can that work? Please advice! THanks!!!! Great Website! Coz | ||
| How do you build it send better directions | ||
| I have a few questions that I hope you can answer:1-Does the transistor have tp be exactly the 2N3565 NPN Transistor or would any similar NPN do? 2-In your schematic you have 4.5V batteries drawn. I canot figure out how to incorporate these into the project-any andvise? 3- Do you have any more detailed explainations on how to make this work? Thank you | ||
| this project implementation was completed by me so remove this project from this site | ||
| good project and good to see in this site | ||
| Where would i get these parts i live a little north of atlanta georgia. How much would these parts be? Thanks | ||
| simple, but good idea project | ||
| thanks!!! | ||
| I am from argentina. where I can buy the parts? Is difficult to do? thanks | ||
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