tl431

This is the Shunt Regulator circuit with TL431 Voltage Reference – Shunt Voltage Reference IC. They are easy to use, comprises one IC, three resistors, four capacitors. If you like to use Zener diode for the voltage reference, it very cheap but low quality than the IC. In the circuit, the...

This is a simple to build charger for single 3.7V lipo battery. The heart of the charger is TL431 shunt regulator that controls the incoming current. Charger comes with a convenient charging LED indicator. As charging current goes down so does the intensity of the LED