Ni-MH Battery Charger circuit 4 AA batteries can be charged in the circuit is more complex, but in general attiny26 microcontroller circuits BD140 transistors and a few passive components consist of batteries connected to the channels via LEDs showing... Electronics Projects, Ni-MH Battery Charger Circuit Atmel ATtiny26 "avr project, battery charger circuit, microcontroller projects, " Date 2019/08/03