How the Circuit Works
How to Sep Up the Circuit
Setting up this automatic self regulating automatic battery charger circuit is very simple and may be done in the following way:
Remove the anode of D6 from the relay contact and connect it to the positive of the power supply.
Keep both the presets somewhere at the center position.
If the battery voltage crosses the above "window", the relay will trip and stop the battery from charging.
Parts List for self regulating automatic battery charger circuit.
R1, R2 = 10K,
P1, P2 = 10K PRESET,
T1, T2 = BC 547B,
C1 = 2200uF/25V
C2 = 47uF/25V (Please connect this capacitor across the relay coil)
D1---D4 = 1N5408,
D5, D6 = 1N4007,
RELAY = 12 VOLT, SPDT,
TRANSFORMER = AS PER THE CONNECTED BATTERY AH (DIVIDE BY 5)
The following diagram shows the instructions which needs to be followed while setting-up the circuit with the desired cut-of thresholds, using a variable power supply unit:
The above self-regulating battery charger circuit was successfully built and tested by Mr. Sai Srinivas, who is just a school kid but nevertheless has an immense interest in the field of electronics.
The following images were sent by him which displays his talent and intense dedication in the field.