Home Advertise Here About Us Contact UsCircuits Gallery Electronic Circuits and projects, DIY circuit diagrams, Robotics & Microcontroller Projects…..! Ads by Google CIRCUIT DIAGRAM BATTERY CHARGER CIRCUIT DESIGN 12v Battery Charger Circuit with Auto Cut off Jaseem vp / April 7, 2013 This is a simple DIY charge controller schematic posted in response to a request by one of our readers on our facebook page. The main component of this auto battery charger circuit is a 555 timer which compares the voltage in the battery. It turns ON the charger if the battery voltage is below the variable preset voltage (12 volt chosen here) and turns OFF the charger if the voltage reaches 13.8 volt. The battery charging voltage of the charger can be varied by adjusting the variable resistor. Recommented for you: LED dot display based Battery charge level indicator circuit diagram Simple battery charger circuit and battery level indicator with low battery recharge alarm To understand the working of this 12 volt battery charge controller circuit you must have an idea of the internal diagram of 555. You can refer the pin out section at the bottom. You must also check charge controller using LM324 IC where you can find video demonstration too. Automatic battery charger circuit diagram Click on the image for enlarged view Components Required 1. IC 555 2. Transistor BC 548 3. Diode (6A4 x5 ,1N4007) 4. Zener diode (5.1V) 5. LED (red, green) 6. Capacitor 4700uF,25V 7. Resistor (1K x 3,820,2x10E 10W) 8. Variable resistor 10K 9. Relay 12V,10A 10. Transformer 230V/015,5A Working Positive terminal of the upper comparator of 555 is connected with reference voltage in order to turn OFF the charger if the battery charges above 13.8V. Reference voltage is obtained by connecting a zener dide in series with a resistor. If the battery voltage is greater than 13.8V, comparator output goes high and flip flop will be set. This turns OFF the transistor and the relay. For understanding relay working see How to connect relay: Relays working with animation If the battery voltage is below the preset voltage (set by us), lower comparator will reset the flip flop. This turns ON the transistor and the relay will switch to charge the battery. The recharge voltage (preset voltage) can set by varying the variable resistor. Power ON is indicated by a red LED and charger ON status is indicated by a green LED. Components pin out April 7, 2013 in 555 Circuits, Charger Circuits, DIY Hobby Circuits, Indicator Circuits. Related posts Automatic Iron Box Best Electronic Science Fair Project for School Students Simple Electronic Random Number Generator Circuit using 555 and 4026 Simple Transistor Tester Circuit Diagram Using 555 Timer IC ← Phase Shift Keying (PSK) Modulation Code in MATLAB How to Build your Own USB PIC Programmer? → 231 thoughts on “12v Battery Charger Circuit with Auto Cut off” Anonymous July 10, 2013 at 3:35 pm wt u mean 5E 10W Reply Yaseen July 13, 2013 at 12:33 am 5E 10W = 5 ohm 10 Watts Reply bhanu April 4, 2014 at 4:32 pm Yes Yaseen you r right… 5E means sohm …, me bhanu Reply tazor April 19, 2016 at 1:39 am hai can you help me in making a school science project power full cellphone jammer Reply Delta May 26, 2016 at 8:06 pm Yes, Give details pls Reply bhanu April 4, 2014 at 4:34 pm Anonymous 5E 10W means 5ohm 10watt… Me bhanu Reply ISAAC YEBOAH May 17, 2015 at 12:08 pm hi master, Isaac Yeboah is my name and a citizen of Ghana. I came across some your post online and decided to try one of them I mean the battery charger, but the current is too small to charge my batteries so please with due respect can u guide me of how to increase the current or please provide me a different diagram that comes out with 20amp to charge my batteries? because in all I want to design 12v 20amps battery charger. THANKS VERY MUCH FOR YOU EFFORT look forward to hear from you soon. Reply pee October 3, 2015 at 1:46 pm can I use the charger that uses the 555 time to charge a dry cell or wet cell. Reply nelson January 17, 2016 at 1:16 pm Hi sir i made this circuit and it didn’t working but relay remain triggering. can u tell me y. Reply GAURAV July 22, 2013 at 1:56 pm Hiii howmuch prize of this circuit? Reply Admin July 28, 2013 at 11:31 pm Hi Gaurav, To know the price of circuits, please visit our online circuit store Buy from our store Reply walbertofulio April 13, 2014 at 2:28 pm Then when the battery reach at13. 2014 at 4:43 pm You follow this procedure 1)Disconnect the AC supply from the source . 2013 at 6:14 pm Hi. Reply muhammad shahroz nasim October 31. 2)Connect a variable DC power supply from the output of the circuit.. that you wants turn on the charger. and connect battery and set the voltage level by rotating the pot.5volts it on the timer again. 2014 at 2:26 am . 2015 at 9:25 am please give a circuit diagram of emergency light with automatic battery saver means that it works on a pwersupply charging stopped when batter’s charge full and start again charging when batter’s volt is low Reply Pramod October 15.8volts i add a timer 30 minutes to on the transformer then off… when the battery down at 12. Please connect a diode in series as diagram.8v then varie the preset until the LED goes off 4)Then read the circuit description again… ME bhanu Reply Caloy November 23. 3)Set the variable DC power supply at 13. Reply Anonymous July 23. 2014 at 2:28 pm hi gud evening sir can i use this ciruit above only monitoring the battery. walbertofulio April 13. 2013 at 4:34 am Please Clarify which diode you are talking about? is it shown in the above drawing? Reply bhanu April 4. 2013 at 7:15 pm both the leds glow… 10k pot has no effect on output voltage what to do??? Reply admin July 24. You have to use separate battery charger to charge 75ah battery. Reply admin August 7. 2013 at 4:09 pm I have a small UPS & a 12v 75ah car battery can I use the UPS as my inverter? and will the UPS be able to charge the 12v 75ah car battery? because the normal battery in the UPS is 12v 7. Only the green LED will do the on and off during charging. Reply Anonymous August 6. 2014 at 5:40 pm does it works? because my project’s relay is rattling Reply Anonymous August 6. is this charger able to charge deep cycle batteries used for inverters. Reply nico December 17. 2013 at 10:38 am It is highly recommended to use your name while commenting for better response from us. . November 23. Just try. 2014 at 2:16 am actually in my opinion i will not connect directly the TH to 12v from the relay.how many 12V batteries can it charge at a time. Also use capacitor 100uf/16v filter it to the relays coil terminals.0 ah. Adjust the VR until you can reach the voltage of 13. Reply Caloy November 23. And for the trigger terminal of ic555 use 33ohm 1/4w resistor connect to GND. 2013 at 11:57 pm what is the charging current of this charger. 2013 at 10:44 am You can use UPS as inverter but it will take more time for charging of the battery. in this circuit you can expect that the red LED will always glow bcause it is connected direcly from the transformers DC outputs. If on charge mode green LED glow and when fuylly charge greenLED turns off. hope it can help. 2014 at 2:31 am Caloy Your comment is awaiting moderation. connect it to the output terminal of the VR which is the other terminals of the VR one is connected directly to +12v from the relay and the other connected to GND.8v. Reply admin August 7. 2) You can use any number of batteries but charging time will increase. 2016 at 8:47 am Then to charge a Car batery 50ah we use transformer with 10 ampere rating? And 1 more question ouput of this circuit is 12v or 14v? Reply Nonso July 15.thanks Reply Abhinandan January 28. both LEDs glow. 3)Inverter batteries ( Reply wael January 18.2amper per hour how we can achieve this using your design …555 is common chip and easy to find your design will be so popular if it can satsfy the golden current charging rate of 1/10 . battery is @ 7. I have assembled the circuit. 2015 at 12:08 pm Sir it would be great if you could explain esc for bldc using back emf method. 2014 at 2:24 pm To set my preset value where do i connect my multi testing meter and should my charger be turned on while adjusting the preset value. 2015 at 1:50 am so tell us how we can achive the 1/10 rate of charging current …sir you know that car lead acid must be charged by 1/10 of thier current for example a 22 amper per hour must be charged by a 2.14V. . 2013 at 5:24 pm My name is Friday. 2016 at 5:14 am this above battery charging circuit will work for charging sealed 12 v lead acid car battery ? Reply fahad June 28. so the charging current is a little bit less than 5A(some loss due to the series resistance). Reply Anonymous August 18. how do I set my low battery level? Reply anurenjh July 30. 1) Charging current depends on the transformer used.. It is highly recommended to use your name while commenting for better response from us. here we are using 5A transformer. Awntg yours Brgds – Main Reply admin October 6. . it would be great if you could explain esc for bldc using back emf method. and d output volt drop to battery voltage when connect wit battery. 2013 at 1:59 pm You cannot use this for 6 volt battery. I made this circuit for 6 volt 4 ah battery. 2013 at 2:35 pm Am mike. Taking relay connection I'm facing some problem and properly not work (auto cutoff when battery full charged). Reply admin September 2. Reply Anonymous August 24. 2013 at 1:49 pm Hi Mike. hw do i solve dis isseu thanks. sir. pls help me i dont understand hw to connect diode in serie to d circuit. Your question is not clear Reply Anonymous August 27. 2013 at 7:35 pm What does the shaded part of the capacitor means ? I have the polarity problem. 2013 at 1:47 pm Shaded part indicates negative terminal.. Reply Anonymous October 2. Is Upper side of capacitor is positive ? Reply admin September 2. . Pls solve it for my doing the needful. 2013 at 12:11 pm Dear sir. 2013 at 5:24 am Hi. You cannot use this for 6 volt battery. 2013 at 1:02 pm Why do you need the external when you have inbuilt? Reply Marvellous October 18. BC 547 or BC 549 instead of BC 548? Are they the same specifications? What are the differences? Reply admin October 6. 2013 at 7:55 pm . So they may not be able to drive the relay. Will the external charger be connected in parallel with the ups inbuilt charger or separate? Reply admin October 18. 2013 at 3:54 pm Hi! Is it works if i will use BC 546. others are 100mA. 2015 at 5:41 pm Can this circuit be used to charge a 12v battery? what does that 58% at 10k pot indicate? Reply Johndirek Kipte October 2. For BC 548 Ic=500mA. Reply Nonso July 16. Reply vaibhav April 5. 2013 at 1:55 pm They vary in the collector current (Ic). 2014 at 7:34 pm When adjusting the variable resistor what should i use to know when the preset voltage is reached so that i can stop the adjustment. Reply Marvellous October 18. Thanks for your lecture. 2013 at 2:15 pm I cannot give any answer without seeing your UPS board. 2013 at 1:16 pm Could you please show me a design in which you use the above circuit (12V Battery charger with auto cut off) but with a Wind Turbine DC generator motor.I need external charger because of your advice on August 7 to an anonymous fellow. You have to charge it separate by using (if it's a car battery) High current adjustable power supply circuit by setting it's output voltage to 14V. What can l do then? Reply admin October 20. < Reply Shaheed December 10. l want to use the ups as an inverter and the battery for longer period of time. Reply . Reply admin October 20. Reply Marvellous October 20. 2013 at 9:29 am Hi Marvellous. Thanks Reply FOUAD December 17. Here is my suggestion. also replace 10watt resistors with short circuit. 2014 at 9:52 am Hi FOUAD To increase the current replace transformer with higher current type. You cannot connect it parallel. After charging reconnect battery to the ups board. 2013 at 12:41 pm Thanks for your response. 2013 at 7:31 am How to increase the amperage of the charger Reply Yaseen January 5.then you can connect external charger in paralle with the battery without removing UPS connection. charge the UPS battery with the external charger independently when charging is required. If you can identify the charging components of the UPS board. this charger only work with battery of 75ah? can i charge another kind of battery?(45ah.can the above circuit be used to charge car batteries? Reply Yaseen January 5.to reduce time you have to increas the current of transformer. but you should increase the current of the transformer used to reduce charging time…also replace the zener with 5.by increasing the capacity. 2013 at 6:40 pm Matthew.etc. Reply Hafeez Ashraf January 3. please can I have several examples of batteries this circuit can charge? Reply Cristian December 28.) Thank for your time! Reply Yaseen January 5.1V . 2014 at 5:17 am Hi Hafeez Ashraf You can. 2014 at 1:45 am Replace larger amp value of transformer. Reply . use also larger diode amp capacity and no need to use 10ohm/10w resistor just connect directly from the b+ Reply Matthew December 22. 2014 at 5:38 pm Hi. time taken for charging will increase. 2013 at 2:30 am Hi! I have a question about the current. 2014 at 9:44 am Hi Cristian It work with all 12V battery . 55ah. Caloy November 23. 2014 at 7:00 pm can I replace the 5.200ah? sir if not. Thank you.1v Zener by another one with a higher voltage? Can you please suggest a specific voltage? Reply Peter January 6.Thanks. for c1815 (1=emiter 2=collector 3=base) C1815 is much better than bc548 because its (collector current) is Ic=150mA. For bc 548 (1=emiter 2=base 3=collector). what are the things to replace. 2014 at 3:31 am Hi Adsamzy It will work with 12v/200ah battery. Reply adsamzy January 26. sir can this circuit work for 12v. may i know what is the proper wattage of the resistor (1k and 820?) ? Reply Yaseen February 22. 2014 at 8:18 am Is it possible for this circuit to charge a Nimh 9V battery? Also can the transistor be replace with C1815. Reply Yaseen February 22. 2014 at 1:59 am Hi Peter Use 1/4 watt resistor. Reply Caloy November 23. 2014 at 4:20 pm Hi sir. while bc548 Ic=100mA. Ron February 17. 2014 at 7:56 pm Sir thanks for your innovative works. . 2014 at 2:03 am Yes you can replace transistor bc 548 to 2sc1815 but make sure to locate the proper transistor terminals. Reply Thayhor January 10. ) plz relpy me thanks. Reply Rex March 19.can I use this circuit to charge 24vdc and how. It will work with 12v/200ah battery.5a Reply Ariel C February 21.5v. I used a series of 3v and 12v in series also with 150 ohms to achieve 13. 2014 at 11:38 pm Dear sir. Zener should be between 13v to 14v.5A while the normal charger for the battery is 14. 2016 at 4:06 pm hi i have design and construct 12v 30A battery charger but i fine difficult to design the cut off circuit plz can you help with an easy and simple circuit diagram plz Reply vickey February 26.83v on 15v 3amps power supply. why do the makers dont edit it?? Reply Richard MM May 21. 2014 at 12:25 pm hello Yaseen I want to use this circuit with 0 20 5Amp TXR so plz help me and what you mean .820. Reply .k February 6. It says the circuit will stop charging when the battery’s voltage reached 13. Reply i. 2015 at 4:44 pm thanks! this worked out.6v. Reply aliyu February 15. 2014 at 6:23 am Please can I use 12.Resistor (1K x 3.4A battery charger to charge a battery of a 12v. 2014 at 10:13 am There’s an errors on the actual diagram to what has been explained on this project.1.8 but the zener used in the diagram was only 5. ahmed February 26. 2014 at 5:07 pm Hi Aliyu Gray Red Black=820 ohm Reply MOTWE March 16. 2014 at 3:05 pm . your timer may damaged. Reply ahmed February 28. 2014 at 1:55 am Hi Ahmed Maximum input voltage of 555 is +18V. 2014 at 1:02 pm thanks for your answer yeah timer damaged but i replaced it with another one the circuit working but it didn’t cutoff and the relay alway on thanks in advanced Reply aliyu March 3. 2014 at 11:50 pm 1. 2014 at 9:44 am Hi sir. i connected this circuit with transformer 3 amper 24 volt DC timer was very hot . 2014 at 5:57 pm What is the resistor 820 color cody and is the resistor rated in ohm or kilo ohms Reply Yaseen March 10. and output voltage 6.7v? Reply Yaseen March 22.7 dc volt i changed resistor many times but no change and it’s still very hot Reply Yaseen February 27. is it possible for this circuit to give the output of 3. connect it to the output terminal of the VR which is the other terminals of the VR one is connected directly to +12v from the relay and the other connected to GND. 2014 at 10:43 am Hi sir. 2014 at 1:09 am Hi Abdul jalil You have to vary the pot to change the threshold.1 . please give me solution what will be done here.7 Reply MOTWE March 16. this will show that battery is full . Both led glow. is the relay keep click on when circuit working Reply abdul jalil April 2. is it possible for this circuit to give an output of 3.7V? Reply Sanjeewa March 27. 2014 at 2:16 am actually in my opinion i will not connect directly the TH to 12v from the relay. 2014 at 3:05 pm HI MOTWE You have to use LM317 to set the output 3. Reply . 2014 at 9:40 pm hi sir: I connect 14 v to the circuit two LED came on but the relay keep clicking . 2014 at 11:56 am voltage at Control voltage is 5. Is there any modification to use this circuit? Reply kel March 28. Hope it can help. And for the trigger terminal of ic555 use 33ohm 1/4w resistor connect to GND.1 (as zener diode is used) fixed . Reply Caloy November 23. Adjust the VR until you can reach the voltage of 13. thanks Reply Yaseen April 11. 2014 at 11:40 am This circuit is not working. and also battery positive (12 V)terminal is directly connected to Thrshold so Thr > 5. Yaseen March 22.8v. thulani April 7. Reply mukesh patel April 22. Can i use a 12v 5 amp SMPS as input of the circuit replacing the 15v 5amp transformer Thanks in advance. 2014 at 4:01 am dear sir i want to charge 12v 45ah batt.the component required is written that 5 ohm and circuit shows 10 ohm 10w why so? 3. what was your ripple current (Idc) Reply walbertofulio April 13.. Reply emwik April 16. 2014 at 8:13 am hi sir how did you come up with the values of these resistors and caps. what will be the zener .8v the timer on again to cut off the trasformer. 2014 at 4:00 am 12 volt 7 ah battery charger Auto cut off Pls send me quatation 9974889544 Reply . 2014 at 2:48 pm gud evening sir…can i use this ciruit as monitoring the battery voltage? bcoz last time i use battery alternator check to monitor the battery voltage.5v the transformer on again…when the battery reach at 13. can i use ups transformer for this? 2. when the battery down at 12. 2014 at 12:33 pm Hi. i want to build one for the batteries at my work place. Then i add a timer to switch off the trasformer. I have a question. diodes and other resistor values for my requirement? thank you. plz answer in detail i have many confusion regarding this ? Reply jayanath April 17. 1. 2014 at 12:32 pm i wana ask that how it sense that voltage in the battery is greater than 12v. Reply saby April 21. Reply. You can refer our previous article on How to connect relay. Hope it helps.i dont know Reply Khaleel May 13. i want to know if it can be possible to recharge an inverter battery using same source generated from the inverter through external battery charger. 2014 at 2:53 pm Sir. can i use a 12v 5amp SMPS in the place of 15v 5amp transformer? Reply Ability May 10. Thanks. 2014 at 11:13 am i’m only getting a 12V 3A transformer what are the ratings of the other components that i should use ? Reply James Wang June 6. Please i want know if that canbe possible. 2014 at 1:02 pm how to charge car battery using this circuit Reply travis May 27. 2014 at 1:04 pm Hey Saurabh. Reply saurabh May 13. 2014 at 11:03 am please explain how to connect relay……. 2014 at 12:56 am can i use this charger for flooded leadacid type car battery with distilled water?? Reply .Reply Sabya April 22. 2014 at 9:26 pm hi. Reply saurabh May 13. 2014 at 8:31 am my UPS battery rechargable voltage is 82V but i required 110V for charging so tell me whom components are repairable . Reply mandeep July 7. 4 diodes 6 ampere or 6.can you please refer me a circuit diagram using stepdown transformer to get 4v DC supply from 220v/230v (generally available in india). Reply restie June 10. you can try that.The circuit should have sufficient longevity. 2015 at 9:59 am I want to make a led bulb consisting 10 nos of LED of 4v DC each in parallel.Thanking You.Reply Yaseen July 4. 2014 at 11:18 am I cant find the 5ohm 10 watt resistor in the diagram … i can see is 2 pcs 10ohm 10 watt resistor….4ampere diode Reply Yaseen July 4. 2014 at 9:18 am Please refer datasheet. Reply Muhammad Mehboob June 8. Reply SAJIDUR RAHMAN October 27. 2014 at 9:19 am Yes.cost efficient. 2014 at 3:33 pm what is mean by 6A4 diodes. 2014 at 12:11 pm We have used 2 10 Ohms instead of a 5 Ohm. What will be the rated watt of the Bulb? Please kindly reply me. pls need help…tnx Reply Yaseen July 3. Nestor Reply . Can we ignore the 10ohm. 2014 at 2:21 am Dear Sir. 2014 at 10:52 am Hi Yaseem.2amps Reply Nestor Parayno July 27.10 watt resistor. 2014 at 5:55 am plzz provide terminating circuit of the above shown battery charger diagram Reply Kishore July 16.Reply Anjan July 12. Good day. Thanks. pls reply soon. 2014 at 8:14 pm Odinaka by name pls can u give me a circuit of automatic change over Reply akash July 15. I am waiting for your reeply Reply Odinaka July 14. 2014 at 4:49 am whether it works for liion battery of 7. if we ignore do the circuit have any impact on output? Thanks Reply madhu sairam July 21. 2014 at 6:37 pm Where should I put my multimeter red & black Prob when I am setting The recharge voltage (preset voltage). Should I set the voltage when the battery connected or disconnected. Can you suggest how to modify the circuit adaptable to a 48 VDC charger.4v and 5. Please help me sir. 2014 at 7:38 pm hi. I HAVE READ THE ABOVE COMMENTS. THANK YOU! Reply caloy November 26. 2014 at 4:39 pm Hi Sir. WE NEED YOUR HELP…. what is the output Ampr? thanks Reply habib August 5. I have designed this circuit and i could see both the red and green LED are glowing. 2014 at 2:32 am in this circuit you can expect that the red LED will always glow bcause it is connected direcly from the . I know i have a correct connection no doubt. YOU DIDNT ANSWER ANY THIS KIND OF QUESTION. Nothing happen honestly. prakash August 4. 2014 at 3:25 pm for admin: WHY YOU DO NOT ANSWER THIS QUESTION. 2014 at 7:42 pm hi how much time does take to charge 12v 150amp battery by this charger? Reply krish August 6. Please tell me is this normal. Thanks Reply Emielle October 11. I RUIN MY PROJECT BECAUSE I TRUST YOUR DIAGRAM. 2014 at 8:53 am can i use 15 v 1A transformer in this cicuit regards Prakash Reply habib August 5. Both LEDs Glow even if you vary the POT. also i just tried tuning the pot but no effect on the circuit still both the LED is glowing. 1 take 12v zener 3v zener and 150 ohm resistance in series. the voltage is around 2. Thanks to share Reply . what voltage I must have if I want to start charging at 11. Adjust the VR until you can reach the voltage of 13. connect it to the output terminal of the VR which is the other terminals of the VR one is connected directly to +12v from the relay and the other connected to GND. 2014 at 12:31 pm Hlw can i use 3Ahm transfermer Reply Slyder August 29. Hope it can help.5 volt for example. 2014 at 2:39 am Try this changes: Do not connect directly the TH to 12v from the relay instead connect it to the output terminal of the VR which is the other terminals of the VR is connected directly to +12v from the relay and the other connected to GND. And for the trigger terminal of ic555 use 33ohm 1/4w resistor connect to GND. Reply shaikh March 15. Reply caloy November 26.5 volt and the pot can change this value so. Reply caloy November 26. Reply Sharojalhasan August 7. 2014 at 2:34 am Try this changes: connect directly the TH to 12v from the relay.8v. in this circuit you can expect that the red LED will always glow bcause it is connected direcly from the transformers DC outputs. At pin 2. If on charge mode green LED glow and when fuylly charge greenLED turns off. Adjust the VR until you can reach the voltage of 13. Only the green LED will do the on and off during charging. And for the trigger terminal of ic555 use 33ohm 1/4w resistor series it to GND. Hope it can help. I would like to know this formula. 2016 at 2:02 am change zener 5. There is probably a formula to calculate this. 2014 at 9:38 pm Hi I would like to know the formula for calculate the voltage that I want to start charging the battery.8v. 2014 at 4:50 pm What about float charge no mention of float charge. 2014 at 11:35 am HI. i ask if the pin 7 of the 555 IC is connected to the other pin of Relay (the one that has no connection)??? Reply iyiola semiu October 13. IT IS AUTO OFF BATTERY CHARGER IT’S OK BUT IT IS AUTO ON ALSO? ANSWER ME FAST I AM WAITING FOR YOUR ANS …… Reply iyiola semiu September 26. 2014 at 9:20 pm Hi sir! What changes should be made to controll an Input current of 710 Amp and 18 volts PV. Please provide details of fast charge and also float charge. Waiting for your reply Reply mathew September 15. 2014 at 9:46 am Sir how many amp and voltage can be use to charge 12vby200ah b3. 2014 at 7:06 am hi sir. 2014 at 5:37 am is there a pdf version of the datasheet? Reply RUTVIK September 15. Hassan Raza September 8. 2014 at 9:36 pm Sir please how can I add LM393 IC to circuit to work as power surg.tnx. SIR. Reply jagadeeshpatil0 September 29. Basicaly i have Solar panel of 150 Watts. Reply Emman October 12. Reply . 8v. 2014 at 12:24 pm can i skip the 2x 5 Ohm 10w residtors ???? Reply giotest December 7.pls correct it for us I face d same problem. that’s why I need replacement only Reply giotest December 7.Reply ainsworth lynch November 9. Hope it can help.1N4001 ??? Reply john l. Only the green LED will do the on and off during charging. 2014 at 2:26 am If I use a 12012 transformer would that be ok? I only see 15v on the step down side of your transformer Reply Chike November 22. 2014 at 4:21 am Hi sir. Reply xian lee July 31. 2014 at 12:30 pm 6A4 Diode??? can i use 1N4006 . During charge mode green LED glow and when fuylly charge greenLED turns off. Try this changes: connect directly the TH to 12v from the relay. And for the trigger terminal of ic555 use 33ohm 1/4w resistor connect to GND. connect it to the output terminal of the VR which is the other terminals of the VR one is connected directly to +12v from the relay and the other connected to GND. . 2014 at 2:45 am in this circuit you can expect that the red LED will always glow bcause it is connected direcly from the transformers DC outputs. Adjust the VR until you can reach the voltage of 13. I want to ask can I use 1k variable resistor on this circuit f not which part affected and need to replace. I ask this because in my area barely hard to find electronic items like this. Reply caloy November 26.1N4007.I have read all d coments bt u didn’t reply them dat has d problem of both leds coming up while d voltage refuses to vary. 2015 at 3:55 pm good day sir. 2015 at 8:37 pm You have 230 VAC input in my case i have 110VAC. 2015 at 12:15 am how to calculate output current? i need a formula.??? Reply Asantha February 6. Reply saif ur Rehman January 29. 2015 at 11:51 am 10E 10W mean 10 Ohms 10W resistor Reply Kishor February 18.. 2015 at 9:41 am . 2015 at 11:10 am How to set the preset voltage. 2015 at 6:55 am sir i want circuit that automatically on when the goes and auto off when the light comes. December 11. WOuld this circuit still work for me the way it is or would i have to change some components? Reply Ajith January 16. 2014 at 10:03 pm what are the 10E 10w resistors??? (Ohms) Reply Ricardo Versiani January 14...so that i can stop the adjustment Reply alie January 17. john l. what is a 10E 10w (resistor oms / k ) plese help Reply Djeff February 10. 2015 at 3:03 pm sir . but I think cut ac power supply by using relay tx primary side.test with a multimeter Reply . It posible relay use to cut ac..8V Reply Rishi Raj March 31.. 2015 at 3:15 am your trans is not 15015.5 ah battery charger Auto cut off Pls send me quatation Reply Talha February 18.and no auto cutoff at 13. 2015 at 3:46 pm hi! sir did all the resistors are of 10W? Reply Salim Miah February 25. 2015 at 3:40 am Hi. Reply bini April 3. Reply bhasi March 2.We need12 volt 4. 2015 at 12:22 pm hi sir my trans4mer is 15015 v then i put the 6A4 diode at 015 v and i filter with 4700uF /25v cap. I mean this ckt cut battery positive terminal. This circuit will be applicable for 12 volt 30 AH Battery (Auto battery) ? I have 5 Amp Transformer. and the 10E 10w resistor is very hot and also my ic555.might be 18018.. Can I use this circuit ? Reply xander gelicame March 31. plzz help me. 2015 at 4:02 am I made the circuit bu my green LED always ON.3v. 2015 at 7:25 am Hi. then i put 1 more 6A4 diode at + but when i test it the output voltage is 22... Reply Rishi Raj April 9. 2015 at 12:20 pm DEAR SIR..but battery won’t charge beyond 13v max. 2015 at 1:28 am use lm317 0r lm7815 to make it apt for 555 voltage level.its a simple circuit and cheap components Reply xander gelicame April 11. PLEASE HELP ME ABOUT THIS CIRCUIT AND HOW IS WORK COMPONENT IN THIS WORK. 2015 at 5:28 am Hi. 2015 at 9:35 am thank you bini. Reply Adnan Tayyab .... Roni June 5.but how can i make it 12v bini? Reply bini April 10. 2015 at 1:40 pm Please can you give me the link of ckt diagram of 18018 to 15015 used by lm7815? ANAND KUMAR April 8. xander gelicame April 3. 2015 at 5:04 am Ya. 2015 at 12:54 pm yes its 18018 . 12012 Volts. Can I use this circuit for charging ? Reply bini April 13. My transformer is 4 Amp. I am using 15015 transformer (2A). Any idea on what could be wrong? Also when the battery has a very low voltage or is not connected the relay oscillates.i am awaiting ur reply Reply Eugene May 4. Can i place tactile switch before the Transistor to reset if required? As i am only ..2 on pin # 3 of 555 and 4.but i can’t understand the working of 555 timer and its connection………sir.how i can made the pcb.pls let me know design is over. 5. 2015 at 5:46 am I am suraj. i have made this circuit and work properly………. 2015 at 7:55 pm Pls how to connect VR Reply Carl May 28. I got only 5V on pin number 4 of 555. 2015 at 6:56 am hai sir. 2015 at 6:16 am Thanks for this. kindly reply me what i do and how to solve this problem??? Reply harish April 21. 2015 at 7:08 pm Hi my friend. 2015 at 6:48 pm Sir. Across the zener it’s reading 5. Adnan Tayyab April 18. As per schematic /comments u given the changes know……. Any advice on how to disable the circuit in this situation? Reply suraj chauhan May 6. I have a 24V 2A transformer which i can reduce to 17V through an LM317 which will give i think 1. Which type of relay i wnt to buy i have little bit confusion if u have the image means pls send me sir with connection…….2V and my 12V battery is obviously overcharging. 2015 at 10:58 am Sir I made it as given above schematics on PBC. evething is 5n….I have 13 volt transformer can I use this Reply Sarfaraz Alam May 13. please kindly elaborate… Reply rejeesh May 25. My reference voltage on pin 5 is reading 18. means 12v DC relay not operate on that voltage. I do not nee the red led and can therefore remove and the resistor. I have some problems please help me.1V. A couple of questions though.9 at the input of relay. Supply is 15V 3A. i need to make a pcb pls confirm it sir.5A. 10E 10W mean 10 Ohms 10 W resistor? Thanks Reply Roni June 5. plz help me soon… Thank You. I think the two 5E 10w resistors will be to big. 2015 at 1:44 pm Hi. 2015 at 6:51 pm Sir. So how can I convert it? please can you give me a ckt with attache main auto cut of battery ckt or separately… Please… Reply Chethan Tomy June 12. what size do they now need to be with the lower current? Finaly in the diagram is the picture showing the relay normaly open or normaly closed? Many thanks Reply khan May 29.77 amp for charging ay output what’s the problem Reply Suman June 3.then for this i want to set charging voltage and cut off. if so what time it take? if i increase the amp rateing to 2amp or 4amp what will be the effect? will it damage the battery? Reply .. Reply Roni June 5. Please help me. 2015 at 2:24 am Sir i have a 12v 1amp transformer will it be able to charge up my 12v 7.2ah car battery.5Amp and not 5Amp transformer. like if i want to charge 6v battery . i want to make adjustable voltage and current battery charger with auto cut off after full charge. 2015 at 8:49 pm I have completed the circuit but it is giving me only 0.using 1. same for 12v battery. 2015 at 1:23 pm Hello. Ihave a 18018 transformer but for this ckt I needs to convert this transformer in 15015. I have a 18018 transformer. i don’t understand about the variable resistor. what are the things to replace. This circuit can be auto cut off charger phone or not?? Please answer .. how can i use this circuit for charging 12v lead acid two battries are in serisly connected? Reply Isma August 5. I want to use it on this ckt. I need to knows some thing from you. 2015 at 10:48 am Hello sir. 2015 at 11:45 am sir can I use this as a adapter to BPL u. it’s urgent… I will waiting for you.?? Reply prabhakar. 5 ohm 20 watt). On the ckt I can see use 2 registance 10 ohm 10 watt in parallel (it’s mens maybe. 8 of IC 555 and relaly’s upper lag? It’s not will be use on this ckt? please give me solution. Roni Reply sumit chandra das June 17. why need it here……………. 2015 at 8:55 am dear admin . Best Regards.s July 13. 2015 at 11:31 am can i use 18V 12A transformer in this circuit can this circuit work for 12v. 2015 at 2:00 pm Hi sir. Can I use another resistance in this place? What about the lag 1.jayasinghe August 5.help me sir Reply JOSEMON August 22. Roni June 12.. 2015 at 4:57 am Sir. 7.lite…………emergency light Reply R. Reply .200ah? sir if not. How Can I do it (mens how can I convart it’s voltage in 15v?) one more. which xan be actuated by the 12 v to close and open if there is power failures Reply salman September 27. I tired to set pot. 2015 at 8:14 am sir…. 2015 at 3:29 am Hi Every Body. I would like to inform u that this circuits is propperly for only 12voolts dc battery only attach the supply only dc 12 volts no need to variable then it ll be correct work. Reply Vaibhav Umrotkar September 3.Reply rajesh reddy August 24.6…. There is need to change any component value.com Reply M aly April 20. 2015 at 3:35 pm Sir how to make same circuit with12DC 10amp transformer. Salman waheed salmanwaheed2008@gmail. 2016 at 9:04 pm I have 4 batt each 2 conected in series and each group(2 series batt)conected in parrellel each batt is 12v 110amp and my source 115 ac volt 60hz how can i use this circiut to charge my batteries Reply . 2015 at 7:42 pm The relay is not cutoff after battery charged 13.2 or 13. 2015 at 3:02 am will there be any changes if we use a transformer of 3A in place of 5A in this project Reply Vaibhav Umrotkar September 1.is it possible for me to put another relay between the upper positive terminal of the battery and the junction to 6 pin of ic…. Plz help Reply benjamin September 12. 2nd thing for all persons also mention your email id and skype id Thanks. how can be increased the cuttingoff threshold. 2015 at 12:02 pm Hello Sir! Can i ask you. Sir my question is. 2015 at 9:16 am hello sir . Reply .8V? Thank you! Reply JOBIN BABY October 27. I want this circuit on 6v lead acid battery. Reply Parteek October 9. can 12 volt DC input supply charge a 12 volt rechargeable battery ? Please. please. sir kindly help me…….So sir what changes are apply on the above circuit. but not at 13. 2015 at 7:02 am Respect sir. I am doing a project in my School in which I am able to generate 12 volt DC. a big fan of yours projects i have a question that i have a 18v step down transformer can this will work with that or i have to buy a 15 v transformer i hope you will reply thanks Reply Lightman October 21. 2015 at 5:23 pm The circuit is superb I just want to know that if battery voltage gous down after cout off (full charg) Like the charger is connected with battery and also connected an load to battery it will start charging automatically or I have to reset the circuit Reply Upendra Kumar October 7. Parteek October 5. reply as soon as soon as possible.4V. 2015 at 5:47 am hi sir. please. using motors and dynamos. 2015 at 4:59 pm You have to increase voltage because current flow from high potential to low potential if battery voltage is grater the moter the it will work as moter but if voltage is lower then moter then dc moter will work as genrater so I will recommend you to use an 6v battery or an dcdc boost convertor wich will help to increase the voltage and boost convertor also give an stable output voltage Reply muneeb rehman October 11. because i want the power supply to be cuttedoff at 14. Reply Yaseen November 28. 2015 at 3:42 am Hi Kolly See 12v Led Battery Level Indicator Circuit and LED dot display based Battery charge level indicator Reply Shajahan December 16. 2015 at 5:42 am ok.e 72volts.please suggest me which components to replace Reply navin lessing December 23. 2015 at 5:51 am Hello sir i need a circuit for (150ah12volt*4)batteries i.2Ah battery Reply Pankaj Saha December 27. 2015 at 11:22 am Hello Sir. The circuit should have capability to provide +/ 10 A.7V. 2015 at 3:45 am Hi Adam Read 12v Led Battery Level Indicator Circuit and LED dot display based Battery charge level indicator Reply Kolley November 27.8v Thanks Reply Yaseen November 28. Adam November 27. 2015 at 6:46 pm Hi sir Pls how can I include LED to indicate battery fully charge at 13. now what is the charging voltage and current for a 12V 7. I want to use this circuit for supercapacitor charging (2.good work. 10F).. 2015 at 2:34 pm The circuit is working nicely but how will can I connect an led to indicate the battery is full charged.. what kind of . (max) to one side. Reply James Pittman January 21. output voltage is 16 v .change I have to made in this circuit or this circuit is fine for that. When I turn the variable resistor or pontesion. So the only problem is how to overcome the otomatic cut off and otomatic on to work? Appreciating for kind respon for solution. . 5. 2016 at 8:21 am sir this 555 charger will able to charge 12 v 35 amp car battery ? of any replacement of components are require ?please specify. What i found are : 1. when set by 10k variac voltage become 11. plz help me. 2016 at 6:32 am Is there any way to use an SCR to turn off and on the charge circuit? and not have float charging or trickle charge. Would it be possible to let me know by email? Reply abhiraj January 30. The current output is okay around 14. the effect is the green lamp is off but the IC is become very hot 3b. The otomatic cut off n automatic on. Reply KK December 29. When I turn it (max) to the other side (opposite 3a). Reply Deepal January 31. the green is on and IC temperarature is normal 4. All red dan green lamps are 2. 2016 at 5:47 am can I use two 6v batteries for a 12 v battery Reply james February 5.5 Volt (with traffo 5A) so it is still working to recharge the battery.67. 2015 at 6:17 am Dear Sir Please ask me how to used battery maximum reating? Reply praf January 7. 2016 at 6:59 pm green led continue on. 2016 at 1:01 am I made this circuit. thanking you. both not wirking 3a. can’t set to 12 volt for charge 12 volt car battery. Thx Kindly as been set. what if i use transformer 220v 12 instead of that you have used in this circuit and what are the changes that i need to do … Reply sathish February 24. 2016 at 10:50 pm Hi sir . 2016 at 8:55 am Can I convert a simple charger to automatic battery charger. Priciple. 2016 at 5:46 pm how can i modified the circuit to charge a battery not more than 5.2 volts??? Plz replay as as posible Reply Pwajok March 10. then How Reply Sanaullah March 4. If yes.com) Reply Sitanshu Mathukia March 1. 2016 at 11:22 am What is the Aim. 2016 at 10:39 am please I need you to help me with the youtube video of the 555 time automatic battery charger operations. Reply Amal GAMAGE .Appreciating for kind respon for solution. 2016 at 10:33 am hii. I want circuit diagram for “testing of induction motor using power converters” anyone pls send me to this mail address (
[email protected] am sathish . I will be pleased to receive it in my mail. Applications and Benifits of this charger? What battrey will this charger charge? And how doesi it work? Reply Mubbashir March 2.. Reply Deepak February 24. 1V at pin # 6. when it rectifier it . You must put a pot 22K between pin # 6 and the battery +.. Reply Shiras May 7. 2016 at 4:23 pm That circuit doesn’t work. ( 12v .1V. the relay is only one side. 40AH) Reply Rahul April 12.8V.1V.5V. Plus. I have really run out of time. Then adjust the 10K pot to 2. the 555 only will set when the pin # 6 reach 5.8v in DC but how is it identify when I giving 17v to the battery.Adjust this pot to 5. i have a 4v batt…. Amal GAMAGE March 21. It supplies 17v to the battery and the circuit is getting hotter and hotter . If you fixed the pin # 5 in 5. Can I use direct DC supply of 17. 2016 at 5:32 am please I have as well done the whole project. 2016 at 4:54 am hi sir. you said it automatically cutoff the relay bt 13. I want to make a rechargeable circuit that voltage can be regulated from 3 to 30 V and current is also variable.what are the modifications to be done? Reply Eric May 9.5V from solar other than a tranaformer? . It becomes 19v in DC . 2016 at 3:16 am what is 820 Reply Edson April 28.5V at pin #2 when the battery voltage goes down 11. am supposed to graduate but am stack_the circuit continues to charge the 12V battery even when full no disconnect. Can you please help me with this ? Thanks Reply M chandu April 27. 2016 at 4:29 pm I made this circuit and give 15 AC current to DIODES . need to discharge itself when the device is fully charged to prevent overcharged. 2016 at 2:13 pm Sir 555 timer automatically turnoff charger when battery is fully charged or it will turn off after particular period of time Reply Chaw April 25. 2016 at 8:08 am Hi Sir. all connections are perfect and correct but no future. when the battery voltage goes to 13. Reply Yasir Soomr May 28. 2016 at 12:14 pm Hi Yaseen.0A.Can I use direct DC supply of 17.5AH) and with the 2A adapter i want to use my wifi router. 2016 at 5:38 am can I use direct DC supply of 17. Pls sir. will you help me on this . That is why i want to use two 12v dc adapter.5V from solar other than a tranaformer? pls reply Reply Eric May 9. Pls Sir. can i use the Charge controller to charge LiFePo4 12V battery. 2016 at 8:42 am I have 12v 2A dc adapter. i want to make simple regulator in which 3 inputs and on output . 2016 at 9:42 am Dear can you Please Clear Tell me Relay Connection i cant understand please Reply must Reply Okey Ben June 16.what is the reason for relay working. 2016 at 1:16 pm i want to make battery charger controller for three inputs.like UPS. Reply Gagan June 18. Reply .13v …I m using 12v transformer instead of 15v …. When input Mains is present. help me and post the updated cct to my Email Reply muhammad alvi June 17. when the AC mains fails the battery will backup my wifi router without interruption. with the 2A adapter i want to charge the battery(4. And i can’t find the updated circuit that indicate battery connections.5V from the solar other than transformer Reply ahsan saeed May 26. MY modem is rated as 12V 2. 2016 at 4:14 am Both the leds glows but relay is not giving output…relay NO contact not closed…across zener diode the voltage is 5. 2016 at 4:24 pm What is the charging current? . Can you please help me to solve my question? 1.Reply Shakil Ahmed June 19. ampermeter use ct transformer 50/5 and frrquencymeter Reply Angelo July 2.What is reference voltage here and which pin of 555 ic is reference voltage pin? 2.Which pin is upper comparator pin of 555ic? Reply david July 7. 2016 at 3:32 pm Pls the circuit is nt working. Some questions are arise while reading this article. the 10K pot smokes up and it just confuses me totally Reply David fred July 7. any changes? Reply yani June 23. its nt supplying d battery enough voltage to charge Reply Themiya July 23. 2016 at 11:11 pm Could a PNP transistor be used Reply vijay July 5. I have read your circuit description of this battery charger. 2016 at 12:46 pm I have attempted this circuit numerous times and it does not work. 2016 at 4:06 pm Pls d circuit is nt working as in d diagram. 2016 at 1:03 pm how much price if help me make voltmeter . 2016 at 10:31 am Hi! I am Shakil Ahmed from Bangladesh. 2016 at 8:26 am Dos ds circuit relley works Reply . Reply AFEEZ August 18. 2016 at 3:33 am I want to way connect charging condition betrry negetive point chargar positive tarminal and bettry posisitive tarminal chargars negetive tarminal Pliztel me this regan Reply prabhu kiran July 28. 2016 at 6:58 am Dear sir. 2016 at 5:23 am im in nairobi Kenya. 2016 at 8:23 am Plss guys hope dis circuit will work well for me if i follow d diagram above…. thanks for all the info and circuits . I want know about circuit diagram of 12v24v auto detect PWM charger can u please guide me sir thank you Reply RAJAN August 9. Because am abt to satrt my project on ds typic…… Pls i need respose…… Am AFEEZ from nigeria Reply AFEEZ August 18. 2016 at 5:13 am Why u using 2 nos 5ohm10W resistor in parallel Reply rahul July 25.Reply nandaskandan July 24. AFEEZ August 18. 2016 at 5:03 pm Can I charge series of li ion battery Reply Kashif February 3. 2017 at 6:29 pm Sir in this automatic charging cut off circuit how can I change 13.8 volt cut off to 15v cut off. 2016 at 9:50 am Plss will ds circuit work well Reply chuka August 22. Notify me of new posts by email. according to your diagram I can see a negative coming out and also two wires coming out from the transformer. New CG Program Store .what will happen if I change the value of zener towards higher voltage or lower. 2016 at 8:51 pm Hi. pls how do I insert the circuit into a 12v inverter. thanks Reply Arjit Singh December 8. Reply Leave a Reply Your email address will not be published. Required fields are marked * Comment Name * Email * Website Post Comment Notify me of followup comments by email. ! We accept Credit / Debit Card. New CG Program Store CircuitsGallery introducing 'The NEW CG PROGRAM STORE'.. Programs are 100% tested & Output guaranteed. from where you can buy embedded program codes... Internet Banking & Direct Bank transfer . Visit CG_PROGRAM_STORE.