How can I charge a NiCa battery with a small DC (permanent magnets) motor spinning the shaft by hand?
I can run a small FM radio with this motor spinning the shaft (via the belt pulley) by hand. I think the motor produces at least 3V/40mA. I tried to charge a nicad(800 mAh) by adding a diode to the power wire but it failed. All I need is a circuit(schematic) to charge a battery. Help, please!