Variable Dummy Load for Power Supply Testing.

How to test a voltage source to know if it is good or not?. What is the percentage regulation?.

Delayed activation 15V voltage source using LM317.

This circuit uses the LM317 voltage regulator. This voltage source also uses a bipolar PNP transistor and an electrolytic capacitor, to achieve a delayed activation of the voltage regulator

20 Amp Variable Power Supply using LM317

This 20 Amp Variable Power Supply varies its output voltage from 1.5 to 15 volts and is based on the well-known variable voltage source configuration, where only the LM317 voltage regulator is used.

LM317 variable voltage regulator circuit diagram.

LM317 characteristics. How the voltage regulator circuit works, Regulator circuit operation improvement