Car Battery Charger circuits Schematic Diagram

Car Battery Charger circuits Schematic Diagram

This circuit shows car battery charger that will 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.

Part list of car battery charger schematic:

U2 1 LM301A Op Amp
U1 1 LM350 Regulator
S1 1 Normally Open Push Button Switch
R7 1 0.2 Ohm 10 W Resistor
R6 1 15K 1/4 W Resistor
R5 1 230 Ohm 1/4 W Resistor
R4 1 15 Ohm 1/4 W Resistor
R3 1 1K 1/4 W Resistor
R2 1 3K 1/4 W Resistor
R1 1 500 Ohm 1/4 W Resistor
Q1 1 2N2905 PNP Transistor
D1 1 1N457 Diode
C3 1 1000pF 25V Ceramic Capacitor
C2 1 1uF 25V Electrolytic Capacitor
C1 1 0.1uF 25V Ceramic Capacitor

MISC 1 Wire, Board, Heatsink For U1, Case, Binding Posts or Alligator Clips For Output

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.

A heatsink will be needed for U1. 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.


Sesilia said...

I have been looking for the working of car battery charger, you provided very useful stuff upon...thank you so much keep it up!