This 12V Nicad Battery charger 200mA/H circuit charges the electric battery at 75 mA until the battery is charged, then it cuts down the current to a trickle rate. It’ll fully recharge a dead nicad battery in 4 hours and the battery can be left in the Nicad Battery charger for a long time.
Setting the shut-off point, connect a 270 ohm, 2-W resistor across the charge terminals and adjust the pot for 15.5 V across the resistor.
Parts list : R1 : 1K R2 : 68ohm R3 : 2K D1, D3 : 1N752 D2 : 1N4001 T1 : 2N2219 T2 : 2N2222 VR1 : 10K
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