This is a basic diagram of a Portable Ni Cad Battery Charger. This circuit is designed to charge battery packs of Nickel Cadmium from 4.8 to 15.6 V from remote power source such a automobile battery.
When power is applied to the circuit, a small bias current supplied by R1 via winding W1, starts to turn on the transistor TR1. This forces a voltage across W2 and the positive feedback given by the coupling of W1 and W2 causes the transistor to turn on applying full supply across W2.
Circuit Diagram Below:
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