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| This charger will charge any 12V lead acid battery including flooded, gel and AGM. It is fully automatic and will charge at a rate up to about 4A until the battery voltage reaches a preset point at which it will switch to a very low current float charge. If the battery voltage drops again the charger will begin charging until the voltage once again reaches the cut off point. In this way it can be left connected to a battery indefinitely to maintain full charge without causing damage. An LED indicates when the battery is fully charged. |
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| TO SAVE UN PLUGGING TO STOP BATTERY DRAIN, PLACE SUITABLE DIODE IN FEED TO BATTERY | ||
| Posted - Sep 18 2018 : 11:36:55 AM Show Profile Reply with Quote I have made two 12V chargers using your circuit & both perfectly working. Thank you for the circuit diagram. Now I want to make a 24V charger. What are the values of components ? | ||
| Thanks a lot for the electrical circuit. I have done it, but I had to replace a 2 pair of resistors at 82 Ohm 2W (parallel pair gives 41 Ohm 4 Watt) instead five ceramic type resistors in series at 8.2 Ohm 10 Watt. In this case, no fan is needed. Slightly warm. BRX49 could be replaced by mcr100-8 or P0102DA may be BT169 or 2N6565. See datasheet, compare. Ilike it. Very. | ||
| I want to build this circuit urgently for my 12Volts 7 AH /18AH /35Ah Dry Cell batteries .i am a newbie ,sorry for my bad english. My Parts Specifications : 12V transformer 20 AMPS 35 AMPS BRIDGE KBPC3510 . TRIAC BT137 8AMPS SCR TNY616 16AMPS mounted on heat sink Can i use full wave rectification for this circuit ?? and what is the output power of this circuit according to my specifications. ?? can triac is triggered through the output of bridge rectifier ?? | ||
| If I want to design this circuit for charging the battery 6v What must be corrected. Using solar power is 12v identity. Please help me complete this project. (Editor's notes: Won't work from DC.) |
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| the half wave rectifier will not give the required 13.8v charging voltage if it is feed by the 12v ac from T1. | ||
| I built this circuit more than 20 years ago and I used two SCR and a bridge graetz. I can guarantee that near zero volts the Q1 was dying anyway and left again at the next half-wave, of course, if the circuit demanded it. Sometimes I used a Tr NPN instead of Q2, but I never used Zener diodes, resistors only calculated appropriately. A defect and a merit of the circuit: while the charge current is reduced, the components are heated and increases their conduction thereby reducing the V Gate (or VBE). | ||
| hello I would like to ma information about the R2 component ... need to know if it is 100 Ohms or 100k Ohms eh ?? do not think this variable resistance of 100 Ohms here in Brazil I can use a 100k in place of that of 100 Ohms or some other | ||
| HI can this charger modified to give the battery charging level (more than one green led and one red during charging process).the charger can use the solar modules .If yes pls send me the circuit diagram and component list.Also the price of this kit. thanks | ||
| Thank you for the great Circuit. LED goes off at about every 10 seconds. Is it the normal state of operation or do I need to adjust Pot to glow it continuously. ? | ||
| hi! if 18 AC volts Can we use this circuits And one battery charge from solar and other battery fit in running circuit, the solar battery can connect to the running circuit battery. can you help to design a circuit for this. thank x | ||
| Hello. Just thinking what is the output power of this circuit? And how long will it take to fully charge the 12V battery? :) Thank you. (Editor's notes: As I'm sure the notes say, the output is dependent on the size of the transformer up to 5A. And the time it takes to charge the battery depends on the size of the battery.) |
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| Hi, Thank you for sharing this knowledge. Can you please help me with an information? I need a 12 volt battery charger with 12-14 amps capacity. From the schematic above, what are the components I need to change to achieve this? and what exact specs of the components? Many Thanks. Chris | ||
| i have a question. what if there is no available BRX49, is there any option that this circuit work? or what would i do of this problem?? please help me, i need an answer.. you are part of our project.. please reply asap. Godbless | ||
| thanks for your above chart it is clear but I really need 24 volts to charge 2 batteries at same time so plz can you just replace the required parts only on Description table or whole image itself. Actually I got 220 ac to 24 volt ac transformer i want to use this transformer for charging by converting into DC line..i n past I did lot but always some thing blows off..so plz if possible contact my email add.. | ||
| can this circuit diagram suitable for ups charger? | ||
| asalamualaikum bro i have one prob on this circuit please tell me what is the substitute of BRX49 SCR ,,,,this ic is not available on my area so please guide me what can i use for its substitute.??? | ||
| hi..... how to add 2 or 3 batterys to this same circuit........??? | ||
| i can't found the TRIAC BT136 but can i use TRIAC BT139 instead of TRIAC BT136? and can i use BC548 or BC558 instead of BRX49 SCR? and can i use IN4004 diode instead of P600 Diode? please help me. i need to complete my project urgent. | ||
| i assembled a 12v charger only using 1no center tap 12-0-12 transformer 4amp and 8nos of power diode 4nos for each side and charged 120AH BATT WITHIN 8HOURS. CHARGING CURRENT FOUND 10AMP. NO MORE COMPONENT USED. WHAT WILL BE THE DEMERITS ON IT . | ||
| pls how can this circuit be reconfigured to charge two 12V/15Ah sealed lead -acid batteries using a 27 or 28 volts AC/DC converter | ||
| i made that cct n its working good, used full wave rectification coz D1 introduce high resistance, n BT151 for brx49, | ||
| Dear sir, We try to make the circuit but at the output we are getting voltage between 6.3 v to 7.38v only. Connected LED D4 is not glowing. We are connected 3v red LED. Please guide us how to get complete 12 v for charging the battery. We also connected 12v chargable battery at output but we are not getting 12v at the output. | ||
| hi been wondering whether Vac or Vdc is used to power the device? i tried making it but it failed to power up. please send me an email. thanks! | ||
| Dr. thanks for the good work, Please how long will it take to charge 12V 200AH battery and how will i change the design to charge the battery within 5hrs Please send me the reply if possible with the circuit diagram to my email | ||
| Hello, I'm going to build this nice gel charger and i womder what values and components do i need to change for a 24V feed ? | ||
| third class circuit dont try to assemble otherwise you will loos your mony and time | ||
| Does this circuit really works? What is the charging time for a fully discharged battery? What will be the approximate cost(in Indian rupees) of building this? | ||
| Hello, and thanks for a good circuit, it is easy to build and to modify' I've made two of these and two of my friends are very happy. For starters, I substituted the 4x2 watt resistors,for 5watt ceramic type, added adjustable fan cooling using separate power supply. Next time I make another I'll add volt and amp gauges. Thanks once again | ||
| can i know , how the triac in this circuit operate? And the overall operation for the circuit ? TQ | ||
| hi sir Can this circuit be modified using 6V battery? | ||
| How long does it take,n how much in $ | ||
| Can I use BT138 or BT137 instead of BT136 ?, (75 ohm 4w) instead of (82 ohm 4w) resistors ?, are there any equivalents to brx49 ? | ||
| Would like to have a go at this one & was wondering if anyone has the layout for the PC board | ||
| Then 2 330 Ohm 1/4 watt resisters burnt seems it should have been closer to 2 watt . . I am replacing them with 2 1k 1/2 watt in paralllel which means it will be 500 ohms of resistance and 1 watt of power disapated . . will find out in a bit if it holds | ||
| Thanks author!. I've just finished building this project within 3 days. My output volt from charger unit terminal without connected to battery was 6.92v but as i connect the output terminal to the car battery terminal, i've got 12.94v (increasing, but LED not yet ON) please tell me is it normal for the different volt reading (from the output charger unit) when connect & disconnect from the car battery terminal. Btw, can't find P600 diode so I use A610 instead. | ||
| i read all the comments and decided not to try this...hehehe do not waste money..lol | ||
| Can this circuit be modified using 6V battery? | ||
| HI MY ANOTHER QUESTION HOW CAN I REGULATE THE AMPS eg: i want to charge 7 amp and 14 amp battery in one time or 7amp and 7amp and i have a charger of 14 amps or only 7 amps. | ||
| hi i like your project and i want to charge more amps battery what's my question is how can i charge 35amp battery FROM 220V DC. | ||
| Hi. Can i charge my battery 12v 250amp. | ||
| let me build this circuit and find out hw results will be.i real like to deal with challenges like these at a very early stage so that i can see where am i going with electronics. | ||
| Dear friend I am an ameture in electronics. I am interested in using the circuit for charging my 12V battery. Can you please provide me some check points to make sure that what I have wired is correct. Thanks in advance Ramesh | ||
| can i use a 12v 20a transformer with this charger | ||
| Hi there... I built this circuit about a year ago but I think I have done something incorrectly. The highest voltage the circuit can achive is 13.4V... and the LED never ceases to flash when the pot is set to this, the highest possible charging voltage. Is my battery being adequatley charged at 13.4V? Time to charge is not an issue at all. Perhaps my question should be: What is the minimum charging voltage for a 12V SLA battery? Thanks | ||
| what will be the amp rating in the transformers secondary core and if i use a 2 amp transformer will it charge a 7 amp battery. | ||
| very confused wit the connections of the triodes( Q1 and Q2) . unable to detect which terminal to connect...... Please help.... | ||
| What component should i change if i wanna charge 24V AGM battery | ||
| I build this project exactly like in description. I did not make any change of the parts. I tried to charge my battery car (12V/35Ah) and I did not have succes. The charging current was about 20mA. My battery was not dead she have 12,7V. But with an battery witch indicate 10,7V the cahrging current was 16,7mA. Wat is wrong. The circuit is good or what?? Excuse my bad english!! | ||
| Is this charger can charge also SEALED Lead Acid Battery? please answer me.. tnx | ||
| Can I use 12v 5Ah transformer instead of 4Ah ? I have it in my handmade car battery charger which is a basic charger (just simple rectifier and nothing else) and wanted to add your circuit to it. | ||
| how could i run this off a 12 volt dc like cigar lighter chargers or jus a 12v source of a car? (Editor's notes: No.) |
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| can this charger charge 12v 200ah deep cycle battery | ||
| This project is interesting...but how to modified the schematic to become the Automatic variable battery charger 0-24VDC with the cutoff switch when the battery is FULL loaded? If better to add meter and display to indicated the charge voltage and current...Any idea to done this? | ||
| hi i have to install battery charger for my ups so if i have to increase current of charger i.e 4amps to 10 or 20amps what i have to do?? | ||
| I am surely interested to build this project, however my great problem is how to find replacement for SCR- BRX 49. Do you have any suggestion? Can I add a relay switch to an inverter to switch to it during power brownouts? | ||
| Why we need R5 and R8 here? I thing it the same as R4 and R7. | ||
| hi, can i use TYN612 instade of BRX49 SCR? because BRX49 SCR is unavailable only TYN612 available.please hurryup sir i m on line... | ||
| So this circuit can charge any sealed 12V battery? What about higher voltages? Would this design work to maybe charge electric scooter batteries? | ||
| To avoid battery discharging in event of mains faiIure, fit a relay whose (230v) coil is energised by the input supply, and switch the charger output + via the N/O contacts of the relay. clsed when power present, open when not. Simple, cheap. | ||
| You can avoid discharging the battery when the power is off by adding a diode at the output +ve.
By the way the circuit does not work with Full-wave rectification right?
(Editor's notes: Adding the diode would prevent this circuit from working.) |
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| This circuit is a good one. I can easy understand it. | ||
| Would leaving the battery connected to the circuit while not plugged in be cured by putting a diode between the charging circuit and the battery on each terminal? If so, what should be used | ||
| what if i connect the same p600 diode at the positive of output.... i think this will solve the problem of discharging the battery when there is no power! is it so??? :) | ||
| hi sir, i want to know how much time the battery takes to get fully charged... | ||
| Hey, 2 questions about this circuit. 1) if i were to put diode on the 12Vout and -12Vout in the direction of the output would this prevent the battery from discharging if there were a power outage? 2) if i were to try and split the Vout's in parallel, how many batteries would this circuit be able to re-charge? ( theortically it shouldn't matter, but in reality? ) - yes i am aware this would drastically change my charge time ( factor of half? for each successive battery) This circuit looks like a great alternative for me looking into making an electric vehicle =) Thanks | ||
| i need to powered up a 12V 4A load, at the same time charge up a back up battery of 12V.can this circuit works for my application? | ||
| please how can i adapt this circuit to a 6 v lead acid battery ?? | ||
| i want to use 40 amt triac for bigger AH battery pls is it possoble? | ||
| 1) For the 12V lead acid battery charger, can i use a 240V- 12V / 2A transformer instead of 120V transformer ? 2) Can i use this charger in my 12V 25A battery ? 3) If so, how long i need to charge it until full ? Thanks... | ||
| AC source only | ||
| Hi, can the circuit be run from a 12V dc source or does it have to be AC ? | ||
| i av found the substitute for brx49 i actually used BT169 its difference is that BRX49 can accommodate a max voltage of 200v while BT169 can accommodate up to 400v but they both do pretty much the same work. i av used it in my circuit and it worked. the only problem that i av is that i need a modification for 24v charging system. | ||
| You can try 2N6565 for BRX49. See http://www.classiccmp.org/rtellason/transdata/2n3001.pdf Notice the authorship of the schematic is not known. Please stop posting comments hoping someone will write you back. If you don't want this circuit to drain your battery if it's connected and unplugged, buy one more D1, and stick it between Q1/R1 and the battery, with the cathode connected to the battery side, and the anode connected to the component side. If you drew it on the schematic its symbol would be thus: Q1 & R1 ->|- to 12V battery. | ||
| I have put together this charger with these parts, DigiKey part # R1,R3= OD33IJE-ND R2 =100OHM 1/2W 3329P-101LF-ND pot R4,R5,R7,R8= 82W-2-ND R6= 100XBK-ND R9= OD102JE-ND C1= P13477-ND D1= SB550-E3/54 GICT-ND D2= 1N4004 DICT-ND D3= 1N4734A DICT-ND D4= LED Q1= 568-3651-5-ND Q2= EC103M-ND T1= TRIADMAGNETICS P#= F219X 115/12VAC 4A Now out put of transformer is 13.65VAC and out of D1 is 8,95VDC. On Q1 pin 1, 8.95VDC Pin 2, 1.05 which is the 12V + bat out put. Pin 3 Gate, 8.96. Q2 is Pin1, 8.3-V Pin 2 .41V Pin 3 -.2V, which is the -12V bat out put. So what have I done wrong? Any Help would be appreciated. I am trying to make a charger for my robot which has 4 6V SLA batteries 2 in series and then in parallel for 12V. | ||
| There is a problem, if you leave the charger at an unattended location and the power goes out, it will discharge the battery. (Editor's notes: Yep.) |
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| can i know the actual pin configurations of the triac and the scr used in the circuit?plsss.... PLEASE GIVE ME THE SUBTITUDE OF BRX49 scr i am from india and it is not aviable plz give me the another subtitude for it. I used tyn604 but LED is glowing Countinusly. please send me details and please send pcb layout. thank you. | ||
| Why do you use a triac in a DC circuit? What about replacing D1 by a rectifier and Q1 by a thyristor? | ||
| what other equivalent can one use to replace the thyristors if not found? | ||
| sir i need brx49 scr but in local market not avilable in this number scr plase help me this scr eqlenet numer send my mail your sinci chandrashekar | ||
| Ya. its nice. i request you to kindly explain for me how it works. Theory and procedures used. Use my email please. Thank you. (Editor's notes: Search the forum for this explanation.) |
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| l have this charger in my off road camper trailer and it has stop workingcan you help me out wiht it l live in perth is there a dealer here; | ||
| How do I modify automatic 12v lead acid battery charger to Automatic 24V Lead Acid Battery Charger with Transformer 24 volt 5A | ||
| have yoy done anything with desulfators.I've biult 2 and I'm not convinced they do anything (Editor's notes: They don't.) |
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| sir plz give a substitute for BRX49.i cannt find it anywhere | ||
| the designer of this circuit has been used the half wave rectifiering .which performs that D1. without controlled rectification voltage so that the a.c voltage of secondary T1 must be within a stable range (12.5--13.5) volt .without widely shiffting. otherwise less than 12.5 volt there is no complet operation charging (full charge ) and more than 13.5 volt for long time may damage the battery .because you know the main a.c source that feeds the primary T1 is unstabl . do you know what is the equivalent circuit of a batte | ||
| This shows that a lot of curious people that know zero about the principles, still try to build things. It is very elementary knowledge that what charges here is the peak current/voltage, not the RMs values, so it really does not matter if is half or full wave. | ||
| I have a 24 volt charger no longer used to charge power wheelchair batteries. I want to change this to a 12 volt charger for a car battery. Seems like it should be reasonably straightforward. How will I go about this. | ||
| I have 4 x 105 Amp 12v sealed solar batteries being charged off solar panels during the day. At night I would like this charger to come in via a day night switch and check the batteries are full, if not it must come in and fully charge these batteries, so that they are full at all times. However I do not want to overcharge or damage these batteries in any way. i ahve built this suggested circuit and tested it on various 9aH 12v sealed alarm type batteries with various shelf voltages (Battery Voltage as they are on my workbench and have not been charged for some time). However I have had to take my seconadary transformer voltage to 16v Ac to get anywhere near + 13v required to charge this type of battery, but I get a maximum of 100mA charging current. Am I doing something wrong. Please advise as soon as possible. Thank you for your kind assistance and keep up the good work. Chris | ||
| 12v , 7ah : what will happen if he battery is charged for 24/7 hours , charge voltage 13.5v , with out any cutoff circuit Is this the right way of charging pls help | ||
| dear sir, i need a auto charging circuit which will be 36VDC auto charger. can i get such type of circuit diagaram with parts list. | ||
| All the circuits this person has are failures. I have built a few and none of them seem to work.This circuit shows that when 12v AC passes through D1 straight away you will only get half the voltage which is 6 volts dc so how is it going to charge a 12 volt battery? Shame on you for putting stuff like this on the net. (Editor's notes: This charger works fine. You are making mistakes.) |
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| If only it was so simple ...
Unfortunately, due to the circuit having no smoothing whatsoever, any battery would be subject to so much 'ripple' current that it would be destroyed in a short space of time! (Editor's notes: Been using this circuit to charge batteries for nearly 10 years. No issues.) |
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| instead of using ac supply ,can i use solar panel with output voltage 13.8v what regulating component can i use? | ||
| if i need to charge the 12V/9ah battery and simultaneously run a dc fan, how do i protect the battery getting discharged when there is a low sun light(can i use zener diode if so what could be the value i need to use?) | ||
| can this charger, charging the lead acid battery 6V? If this can do it, what needs to be change?Thanks for the information | ||
| I have two 24 volt industrial chargers, can i convert these for charging 12 volt automotive batteries? These chargers originally were charging four six volt gel cell batteries. I have another 24 volt charger that was charging four six volt deep cycle batteries. | ||
| How do I modify automatic 12v lead acid battery charger to Automatic 24V Lead Acid Battery Charger. what component should i change ? thanks | ||
| Sir,How do I modify automatic 12v lead acid battery charger to Automatic 24V Lead Acid Battery Charger with Transformer 24 volt 5A . what component should i change ? thanks | ||
| Pretty nice circuit you got, but please i am in need of an Automatic 12V-120Ah battery charger circuit diagram. | ||
| Q1 is that a triac or an scr? i think Q1 Is an scr . | ||
| how can i make the 12v lead acid battry charger to a 24v charger. | ||
| Hi, if you can provide a charge controller which is charger will automatically turns off the transformer when it reach 13.8V and it will be turning on automatically when the voltage goes down to 11V to avoid battery discharge. Thanks & regards | ||
| TO PREVENT BATTERY DISCHARGE WHILE AC POWER IS SHUT OFF, WHILE BATTERY IS STILL CONNECTED CAN BE PREVENTED BY INSTALLING A DIODE ( 5 amp @50 volts) AT THE JUNCTION OF Q1 AND R1 WITH THE ANODE TO THE JUNCTION AND THE CATHODE TO THE POSITIVE TO THE BATTERIES POSITIVE POST . | ||
| How can the charger supply 4A at >12V when the transformer secondary voltage is limited to 12V? Shouldn't the transformer secondary be at 15V. | ||
| very good circuit | ||
| sir i want Automatic 12V Lead Acid Battery Charger.but the specification is when the battery is full (14v) the circuit is cutt off the charging trans former .i think it protect battery as well as transformer.so kindly send this types of circuit | ||
| how can i modify this to run off of a solar panel | ||
| Is your circuit have over charging protection and it is continuous rated? can i use it for parmenantly connected on mode.? what changes if i want over charging protection. | ||
| To modify the automatic 12V lead Acid battery charger to become a 24V lead Acid charger, do U need to recoil the transformer? | ||
| If input voltage varies from180v to 240v (At transformer primary) Then can I use a Zener Diode (Paralell with transformer secondary) for taking 12V output from transformer,if i can do then what are the specification of that Zener Diode. | ||
| Sr.; Can I use 100ohms/2W resistor in R4,R5,R7,R8 ? I need a substitute of BRX49?, I don't find this component here in Brazil. Thanks!!! | ||
| instead of using ac supply, can i use solar panel with output voltage 13.8v what regulating component can i use? | ||
| How do I modify automatic 12v lead acid battery charger to Automatic 24V Lead Acid Battery Charger. what component should i change ? thanks | ||
| I need help determining what to use for the BT136 Triac and the BRX49 scr. I am trying to find suitable replacements for both. Which BT136 specifically is required? There is an entire series of BT136 Triacs. Do you have any suggestions for more common components that will work as replacements (for both)? Many thanks! | ||
| How do I modify automatic 12v lead acid battery charger to Automatic 24V Lead Acid Battery Charger. what component should i change ? thanks | ||
| Dear Sir, can i use a 6A 12V instead of 4A 12V? Is there any part should i relaced and if there is what components and value it is? | ||
| Sir I have a 18 volt output solar cell.I would like to have your charger to put out 5 to 600 ma. For my place in the desert.What if any resister changes do i have to make please? Thank You Rodney LaMay P/S i have a 12 volt battery | ||
| Please i would like to know what modifications i could make to the circuit to enable me charge 6-8 12v 100amps battery at a time. Ps you are doing a great job. Many thanks. Izzi | ||
| Can we use this charging circuit for charging battery in motorcyle ? I mean where power supply is from stator windings which is variable ? Any response will be appreciated. Thanks. | ||
| How do I modify automatic 12v lead acid battery charger to Automatic 24V/80A Lead Acid Battery Charger. | ||
| Sir, I am using a 6 Volt battery. How can I convert this circuit for charging my 6volt Battery? | ||
| it will charge but charging current is very low approx. 0.6-0.9A,can i increase. | ||
| How do I modify automatic 12v lead acid battery charger to Automatic 24V Lead Acid Battery Charger. what component should i change ? thanks. | ||
| How do I modify automatic 12v lead acid battery charger to Automatic 24V Lead Acid Battery Charger. | ||
| I would like to charge 3 batteries (12V 12 Amp/h each) in serial connection totaling 36V. What resistance values should I change to? Best regards. | ||
| dir sir how do i modify automatic 12 v lead acid battery charger to automatic 30 v 7 A lead acid batery charger | ||
| yeah i need to know how i can improve or simply step up my charger capacty cos 4A is very small to charge my device so i can i step it up i have built my inverter but i need to incorporate the charger circuit into it and the battery i used is 200Ahx 6 so help me out on how to get a suitable charger | ||
| Can i use my 6A 12V transformer on this circuit? I need your advise sir, and reply me, Thank you. | ||
| Hi i will like to make a 36VDC charger 20AMPs if you can help me TKS | ||
| Sir Thanks a lot of your its a very helpful circuit. | ||
| it's very good inormations and design . what do you mean by U1? in last raw of part table | ||
| Dear sir i am designing solar charger to charge a 12V Acid Battery with 185 AH (Amp per hour). the solar cell is 12V, i can run 12V energy saver with the cell. what kind of modifications will be done in above circuit to charge battery thanks | ||
| Sir, I am using this circuit for 6V battery.but the current flowing through the circuit is not as per our requirement.Please give the circuit diagram and working for 6V battery with current less than 0.2A. | ||
| OK THIS CIRCUIT IS OLD TYPE.NO PROTECTION. | ||
| Is this circuit workable for batteries from 50 to 175AHr? if not what changes required to do so, also how much harm this circuit can does to battery, is it reliable to work as first part of UPS. | ||
| How do I modify automatic 12v lead acid battery charger to Automatic 24V Lead Acid Battery Charger. | ||
| after building the circuit i found the outpot V less than 10V ,so added 2200 mic F capacitor after D1 which raises to 12V ; but the led before and after adding did not putoff although removing the VR.please help . | ||
| Hi, How can we add the 12v battery charger to the inverter to continue to charge the batteries while converting power from the battery to 240v | ||
| sir how do i modify the circuit to charge a 12V battery but for a different current? | ||
| sir's do i have to modify the circuit for a 20A 12V transformer? pls reply... thanks... | ||
| Thanks for schematic boss.. Will try it soon... Joel www.apobae.com www.garmin.co.id www.gps.co.id | ||
| In this circuit you suggested 12V ac Transformer, not to mention that the diodes will lower the output voltage also lead acid battery isn't at 12V even when discharged, its around somewhat 12.2~12.3 , and at fully charged its at 12.8 volts. So i wonder how this circuit gonna charge battery ??? (Editor's notes: The output of a 12V transformer is somewhat higher then 12V.) |
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| what are the possible precaution that need to be followed to prolonged the live of the battery charger | ||
| You mentioned in the notes that the transformer could be changed to 18V output for charging larger batteries. Is this also true with 24 volt batteries? I need to charge 24 volt aircraft batteries. Will this ciucuit work for this application? | ||
| sir, how do i modify this charger to get it charge a 24V still with 4A.THANKS | ||
| Can I use circuit for three phase delta connections : 110V to 200V AC inout to charge 24V : 40 amps lead acid batteries: please comment with alternative | ||
| can a i make this so that i can use just as a charge controller with my own power supply | ||
| the site has given me an important clue which i think will help me execute my projet | ||
| It would be kind of you if you can help to design a charger to charge 120AH lead-acid battery via solar cell and alternatively main power line. | ||
| PLEASE GIVE ME THE SUBTITUDE OF BRX49 scr i am from india and it is not aviable in mumbai plz give me the another subtitude for it | ||
| Can i charge 80 Ahr battery or more with the help of this charger or will i have to increase the value of the components used. Please help me out. | ||
| Sir, I need to know the working principle of circuit diagram since i wanted the charger for 48V system with 4A. How do i modify this circuit. Thanks. | ||
| Can we use this diagram in 24v transformer? | ||
| If I want to use 10A transformer, did the rest of part will remain the same or must be use the bigger amps.? Thanks | ||
| we need description of the circuit and operation........... what is need for AND gate to the input of transformer. | ||
| PLEASE GIVE ME THE SUBTITUDE OF BRX49 | ||
| I need a 12V 35A/20Hr car battery charger please do send me. | ||
| Can a 12 volt center tapped XFMR be used with this circuit to charge both 6 or 12 volt batteries by switching the cener tap and the bottom XFMR leg? Thank You. | ||
| Is their a way to make the charger work using 25VDC rather than the 120VAC. I need a battery charger that will run off of 25VDC. Any comments will help. | ||
| Respected Sir, Can u plz provide me the ckt diagram for a microcontroller based batterr charging ckt Waiting for a positive reply | ||
| it is good, but i need something more of automatic. keep up your good work. | ||
| It is good, but i have a 12V-7AH battery. According to theory, We have to charge it by 7/10= 0.7A. So 4A is too high, do you have any idea to decrease it to around 0.7-1A. | ||
| Please send me the functioning of each components(description). URGENT! (Editor's notes: I'll save you the trouble of searching the forum: http://www.aaroncake.net/forum/topic.asp?TOPIC_ID=5954) |
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| i would like to know that if this circuit will able to charge up to 12v 7ah batttery simultaneously? | ||
| This is good but can u give me the circuit description and cant this be implemented even more simply? | ||
| respected sir, can i charge 18ah12v batterry with this ckt, can do it , which input powersupply require,this ckt make over voltage cut off ? | ||
| ENGINEER AYO HELP? Pls give me a circuit diagram that can be use as low battery cut-off and full cut-off e.g when a battery is working with inverter and when it runs down to 9v or 8.5v the circuit should cut-off and when it start charging immediately 13.5v or 14v and 14.5v is gained the circuit should also cut-off, and pls i also need a battery back up. e.g when a 12v battery is been used on inverter , the circuit will make it last at least two,three,four,five days or a week. | ||
| Sir, can we replace the lead acid battery by an SMF battery in the same circuit? | ||
| can i up this to a output of 24VDc | ||
| This is great but for 12v 120Ah battery it does not work? please can i upgrade this circuit? | ||
| hi, sir can you please give me the detailed description about the circuit operation and working of each component in the circuit.
thank you (Editor's notes: Search the forum.) |
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| Good site! | ||
| i would request you to tell me more about this circuit. plz send me an email about the design procedure and woking principle of automatic 12V Lead Acid Car Battery Charger
Thank you (Editor's notes: Search the forum, or read previous comments.) |
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| Can you provide me the most simple design for a battery charger? Thanks | ||
| Sir, Can you please tell me how to make battrey charger with POWER MOSFET MTP3055,Autoshut-off, Polarity Protection,Short Circuit Protection? Thanks You | ||
| is it possible to use this circuit on a 12v 45Ah 300A car battery? | ||
| Nice design. I believe I can answer a couple of the questions, in that you need to know what the allowable high rate charge can be for your application. If you have a big battery (e.g. 19Ah) you can drive a higher current to begin with like this design shows, but if you have a smaller battery (e.g. 2500mAh) you need to drive a lower initial current or you will probably create a toaster or an IED. Simply use a lower current output transformer and your high rate charge current will be lower too. Some component adjustments may be necessary to get the right threshold voltages. Idea: Add diodes (large enough to handle the current) on the output to prevent battery drain in the event of a power disconnect. | ||
| Dear sir, I REQ 12V 10Amp BATTERY CHARGER CIRCUIT WITH FLOT AND BOOST CHRGING ATOMATICALY CHANGE KINDLY SUGGEST ME | ||
| much better if the whole assembly (picture of the circuit's assembly) must shown in this site together with the schematic diagram. well, this site is very good, i learned from it... thanks a lot... | ||
| can i also use this charger to charge a 12v motorcycle(dry cell) battery? | ||
| How about 12v 7A 10hr Sealed Acid batteries ? may I use that schema too? please reply me. thanks | ||
| This project is helpful to the students who wanted to learn the basic concept of designing. R4 and R5 are connected in parallel may be replaced by a single resistor if the desired resistance value is available. R7 and R8 also have the same situation with R4 and R5 as they are connected in parallel. Being a half-wave rectifier circuit, the charging current is smaller compared to the fullwave rectifier circuits. Fullwave center-tapped or fullwave bridge type may be used as an alternative rectifier to this project. | ||
| Please tell me if this charger can be left to charge a battery for indefinined time,or it need other circuits? Regards | ||
| Thanks a lot fot the circuit, i have a question: can i use a full wave rectifier (4 diodes) instead half wave (1 diode). Thanks gg. | ||
| i cant find BRX49 SCR,... can you give an equivalent componet that is widly avelable; thank you... | ||
| Can I use 500mA transformer? And can I use TYN612 SCR instead of BRX49? | ||
| Sir , Can I use this circuit to charge 24 V battery ? Please suggest the componenent value changes. Thank you. | ||
| can u please show the whiole specification about the circuit? kindly sir. thanks | ||
| Good site! | ||
| Can I use a UPS to make it to power to a Computer power supply without the Mains for quite a long time | ||
| can i use this circuit perminently to the battery because when power is gone to load automatically i want to conect this battery to load that means like backup battery. if any modifications required pl.give the additional circuit | ||
| sir, is there any substitute for the following: Q1-:BT136 TRAIC Q2-:BRX49SCR | ||
| thanks to almighty for finding out such a site enhance students especially the young tech- with there career. I say a BIG weldone to the site management | ||
| IS THIS CIRCUIT REALLY WORKS | ||
| Can you also let me know about a UPS and how I can make it to power my Computer without the Mains for quite a long time. | ||
| Thank you very much for this circuit | ||
| Dear Sir,
thanks a lot for all that you are doing for technological improvement and humanity in general.
Please Sir,kindly help me with the full circuit diagram of automatic 12v lead acid battery charger capable of charging 12v 200ah battery automatically..Thanks in advance. (Editor's notes: It's on the page about 8 inches above this comment.) |
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| can i use 5 amp transformer instead 4amp transformer? | ||
| This looks useful. It appears to be the half wave equivalent of a full wave battery charger from Harb.Frieght ~ $20 which is 6v/12v 2A/6A. Item 45005 very nice. | ||
| I need to charge a 18v 1.2 amp lead acid battery. Also, can I use a 18v 1.2 amp dc power supply, it measures over 22v at no load. | ||
| Thank you for this circuit design | ||
| very good | ||
| HI, I WILL LIKE TO ATTACH THIS CIRCUIT TO AN INVTER CIRCUIT TO ENSURE THAT ANYTIME THERE IS A DROP IN THE BATTERY VOLTAGE, IT WILL AUTOMATICALLY BE RECHARGED. DO YOU THINK IT WILL WORK OUT? | ||
| I am very thank u to the person who create this circuit but i am little bit pointed because it does not complete with the process of work, i have a question for you that can you explain me please, how the circuit of atutomatic Lead Acid 12volt charger can work???? | ||
| I feel I will be cheating on myself if I don't thank you people for this great and wonderful work! THANK YOU Very Very much to let us easily get and learn this information. Can you also let me know about a UPS and how I can make it to power my Computer without the Mains for quite a long time. | ||
| thank u | ||
| while looking for above circuit. I found this site and found very helpful. I hope you will maintain it. ok. | ||
| good for the proffessional and the greens alike | ||
| Quite good for me. | ||
| It's a good design, however, using it in a smaller type of lead acid battery might blow the battery itself. using it on a bigger one like 2SM is good, and I appriciate the performance. thanks | ||
| pls i need more xplanation on this project and how to design one for a bigger battery | ||
| I feel I will be cheating on myself if I don't thank you people for this great and wonderful work! THANK YOU Very Very much to let us easily get and learn this information. Can you also let me know about a UPS and how I can make it to power my Computer without the Mains for quite a long time. | ||
| Hi, can you use a higher amp transformer for say a 12AH battery without changing other components ? | ||
| Thanks for the diagram but what type of electrolite cap is needed | ||
| i want to know how it work authomatic | ||
| please kindly send me manual for the troubleshooting for in case of any problem | ||
| It is a Very use fulfor the students like me. | ||
| pliz I wanna get some analysis of a battery charger that is to be used for the ups to supply 12 volts. Thanks. | ||
| Can it be a risk of the gates on the circuit board can be burned off, because of the high current? | ||
| can you please send me the principle of operation of this battery as i want to build one for myself.
Thank you. (Editor's notes: http://www.aaroncake.net/forum/topic.asp?TOPIC_ID=5954) |
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| Can u send me,the pcb layout of this project....please send me also some substitution af BRX49 SCR..because i cant buy here in our area... | ||
| Is it possible to charge multiple 12V 3Ah SLA batteries in parallel at once with this circuit? would anyone be able to recommend any circuit modifications to do so?
thanks. (Editor's notes: Yes.) |
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| pliz sir,kindly e-mail to me the design calculations for the Automatic 12v lead acid battery charger.i interested in making the project and presenting it to the panel.Thanks in advance yours,cyprian. | ||
| First, thank you for your diagram. How can I use a 12vdc input to charge a 12vdc battery? | ||
| CAN YOU SEND ME PLEASE THE PCB OF THIS CIRCIUT | ||
| Is it possible for you to supply the design calculations? | ||
| dear sir, i want clarify about 12 v battery charger , how much for the max amps battery will be conected, thankyou, murali. | ||
| can that circuit use for 24 vdc and 10 A? aand 12 Vdc 10 Amp? what component should change? | ||
| i highly appreciate your notes they have been of great help to me. | ||
| Hi. Great design. Currently I'm looking for at charger to small motocycles, as it is over charging the battery. So I want to know if Q1 can be changed with a TIC 263M? (to increase the current) Best regards, Torben | ||
| HI THENK'S FOR AGRAET CIRCIUT CAN YOU SEND ME PLEASE THE PCB OF THIS CIRCIUT. thank you. | ||
| Hi, Have you had any posative comments from whom have built this charger ?
Would I be able to use these on Marine type GEL batteries?
Does the current self limit in case the battery is flat ?
kind regards
Peter (Editor's notes: Works great. I use it all the time.) |
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| worst charger i have ever seen i can make it more effecient | ||
| Can this be modified for 24 Volts | ||
| a relay can be added to the circuit in order not to drain the the battery if the circuit was unpluged. the coil of the relay can be connected after D1 or a bridge and its normally open switch can be connected in series with the +ve of the battery | ||
| drawing such a huge current with a half wave rectifier continiously will destroy trafo. a bridge rectifier may be used instead. | ||
| i need the above diagram in my box | ||
| is it possible to use a bridge rectifier instead of D1?.Please I will be glad if my question is answer as soon as possible.THANKS | ||
| Please explain briefly circuit function of lead acid battery charger . (Editor's notes: See this forum topic) |
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| its nice | ||
| Which of suppliers could I used to get parts for that your Charger? | ||
| can i know the actual pin configurations of the triac and the scr used in the circuit?plsss.... (Editor's notes: Datasheet...) |
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| My name is wongalethu, i just want to know how long or how many minutes is the charger will it take to charger a battery.
thank you. (Editor's notes: Depends on the size of the battery.) |
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| Ibuilt this circuit but LED not working voltage accross the LED is very very low 0.09v -0.06v what would be the problem | ||
| Could you tell me how can I buy the parts for both Chargers - #1 and #2, please. | ||
| please i need a circiut diagram for 12V/5A battery charger | ||
| i need a circiut diagram for the above.please send to my box | ||
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