Automatic nimh battery charger circuit that automatic cuts off. This project is good ways,Use AN4558 OP-AMP IC. Detect battery voltage when power is full.
This is a small motorola radio charger circuit, with automatic mode for the 9 nickel-metal hydride battery holder, if the battery is charged to 11 Volts. [...]
The project is the NiMH battery charger circuit on automatically shut off when fully charged. Can charge batteries 1-10 pcs. Depending on the input voltage [...]