The constant charging current is produced by an LDO and resistor and gated by Q1, which in turn is managed by an output of the microcontroller. A quartet of LEDs, also microcontroller-driven, indicates charge status to the user
Figure 1. The constant charging current is produced by an LDO and resistor and gated by Q1, which in turn is managed by an output of the microcontroller. A quartet of LEDs, also microcontroller-driven, indicates charge status to the user