Car Battery Charger

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This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the battery is fully charged, the circuit switches off and lights a LED, telling you that the cycle has finished.

Schematic

This is the schematic of the Car Battery Charger

Parts
Part
Total Qty.
Description
Substitutions
R11500 Ohm 1/4 W Resistor
R213K 1/4 W Resistor
R311K 1/4 W Resistor
R4115 Ohm 1/4 W Resistor
R51230 Ohm 1/4 W Resistor
R6115K 1/4 W Resistor
R710.2 Ohm 10 W Resistor
C110.1uF 25V Ceramic Capacitor
C211uF 25V Electrolytic Capacitor
C311000pF 25V Ceramic Capacitor
D111N457 Diode
Q112N2905 PNP Transistor
U11LM350 Regulator
U21LM301A Op Amp
S11Normally Open Push Button Switch
MISC1Wire, Board, Heatsink For U1, Case, Binding Posts or Alligator Clips For Output

Notes

  1. The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors on the schematic. There is no reason why you cannot add these.

  2. A heatsink will be needed for U1.

  3. To use the circuit, hook it up to a power supply/plug it in. Then, connect the battery to be charged to the output terminals. All you have to do now is push S1 (the "Start" switch), and wait for the circuit to finish.

  4. If you want to use the charger without having to provide an external power supply, use the following circuit.

    This is the schematic of the Car Battery Charger Power Supply

    Part
    Total Qty.
    Description
    Substitutions
    C116800uF 25V Electrolytic Capcitor
    T113A 15V Transformer
    BR115A 50V Bridge Rectifier10A 50V Bridge Rectifier
    S115A SPST Switch
    F114A 250V Fuse

  5. The first time you use the circuit, you should check up on it every once and a while to make sure that it is working properly and the battery is not being over charged.

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Comments
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Randy
Car Battery Charger
Friday, November 06, 2009 6:20:15 PM
can you Substitute R1 500ohm with a 510? and R5 230 with a 220 i am unable to find them. thank you
anonymous
Car Battery Charger
Saturday, September 12, 2009 9:54:40 AM
can i replace this switch with a non momentary switch
zizo
Car Battery Charger
Thursday, September 03, 2009 8:42:33 AM
I could'nt find D1 1N457 Diode. What can use else instead of it ??? is there any substitution ?? thank you.
woody
Car Battery Charger
Thursday, July 16, 2009 9:09:10 PM
I like your circuit but the info does not state the maximum current charge rate. please state same. thanks.
umar
Car Battery Charger
Saturday, July 11, 2009 3:12:11 AM
Thank's for your circuit. I need a battery charger that can charge 12 V 10 A. what can I do for that problem, can You send me circuit for that? Thank's....
anonymous
Car Battery Charger
Saturday, July 04, 2009 12:40:53 AM
Yes you can charge a 12v battery using another 12V battery. But connecting the two batteries directly will not charge the empty battery since the voltage difference is zero. You will need a DC to DC converter to convert 12vdc to a higer voltage level commoly 13.8vdc. You cannot expect that the empty battery will be fully charged before the the other battery is drained. You cannot transfer all the charge from the 1st battery to the 2nd since the DC to DC converter will dissipate some power (resistors, transistors, transformer....).
Arthur
Car Battery Charger
Wednesday, July 01, 2009 4:07:39 PM
I wanted to know if I can connect my car battery to the car battery charger while it is plugged up?
Sokvan In
24V-Car Battery Charger
Friday, June 26, 2009 6:36:06 AM
hello, i'm a student and i wanna ask you a question. i wanna make 24V-car battery charger. but i'm not sure how to make it. could you give me some advice, thanks beforehand.
Rob
Car Battery Charger
Wednesday, June 10, 2009 6:19:32 PM
I already built the circuit but when I first connected the battery the led turned off, but when a few minutes later I disconnected it and connected again and the light didn't turn off again...could you help me!!!
MARTINS
Car Battery Charger
Wednesday, May 27, 2009 1:59:06 AM
HOW CAN I IMPROVE THE OUTPUT CURRENT OF THE LM350 REGULATOR?
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