The LM317L device is an adjustable, 3-terminal, positive-voltage regulator capable of supplying 100 mA over an output-voltage range of 1.25 V to 32 V.

Voltage Regulator L78L33ABZ-AP with 3.3V output voltage.

The TL431A is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges.

This module is a Battery Charger suitable for mobile phones. It has a dual USB interface, so you can charge two batteries at the same time.

BT138-600 12A 600V

This is a DC-DC buck-mode power module, with input voltage range of 3V - 15V and fixed voltage / current at fixed 5V / 600mA . Working frequency can reach 0.5 MHz . The module has high conversion rate and small size, easy to incorporate.