Charger Circuit LM393 op-amp based on the computer’s USB port with 5 volts on 2 AA NiMH, NiCd batteries can be recharged. Charging current of 470 pcb circuit drawing and detailed information have. During charging, R1, R2, and R4... Electronics Projects, USB Battery Charger Circuit Nimh Nicd "battery charger circuit, power electronic projects, simple circuit projects, " Date 2019/08/01