Nicad Charger Circuit Diagram. This nicd charger circuit is basically a voltage doubler created using the 555 ic. For example if a battery is connected to jp1 jp4 pins then the current that flows cause a voltage drop to r1 then d1 causes a voltage drop of 07 volts and 1 conducts.
Therminal of c1 bufferelco should be connected to the both cathodes of d1 and d2. Here we have yet another excellent universal battery charger that is easy to build and can be used to safely charge practically all commonly used nicd and nimh penlight cells. A very interesting and useful design of a multiple nicd nimh battery charger circuit which can charge many different nicd and nimh batteries.
A step down ac transformer with the rating of 230v to 15v 1amps is used here.
The ni cad battery charger circuit can be used with the battery will charge with 48 volt current 800ma using it for about five hours which. Because of which the charging current is regulating to 4 amperes so as the charging current get 4 amperes. Using a current limiter composed of r3 and a transistor it can charge as many cells as desired until a fully charged voltage. The heart of this automatic nicd battery charger is the comparator which compares the nicad batterys voltage with a referance voltage.