LM317

The LM317 is an adjustable positive voltage regulator: it holds a steady output voltage, set by two resistors or a resistor and a potentiometer, even when the input voltage or the load changes. Circuits in this tag build variable bench supplies, regulated stages after a transformer and rectifier, and battery chargers, with meters on the input and output to show the regulation working. For example, "LM317 Variable Voltage Regulation Circuit" turns a potentiometer to adjust the output and reads the result on panel meters.