This is a circuit of 12V Ni-Cad battery charger with charging rate of 200mA/Hour. Here’s the figure of the circuit;
This Ni-Cad battery charger circuit charges the battery at 75 mA until the battery is charged, then it reduces the current to a trickle rate. It will fully recharge a dead/unpowered battery in 4 hours and the battery can be left in the charger indefinitely. To set the shut off point, connect a 270 ohm / 2 Watt resistor across the charge terminals and adjust the pot for 15.5V across the resistor.
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