200-mA/Hour, 12-V Nicad Battery Charger

by: F Harq

This circuit charges the battery at 75 mA until the battery is charged, then it reduces the current to a trickle rate. It will completely recharge a dead battery in four hours and the battery can be left in the charger indefinitely. To set the shut-off point, connect a 270 Ohm 2-W resistor across the charger terminals and adjust the pot for 15.5 V across the resistor