The USB Charger Doctor holds an OTP microcontroller, Voltage and Current Sensors, and one 7-segment LED display unit. The internal electronics is powered by an onboard voltage regulator, which ...

Here is a tried and tested sample circuit of a Li-Ion battery charger that can be used to charge any 3.7V Li-Ion battery using a 5VDC (USB, Solar Panel…) power supply. At the heart of the circuit is ...