Variable Power Supply
The variable power supply runs on battery or mains and uses an LM317 to regulate the output. A variable resistor adjusts
the output voltage between 1.2 volts and 10 volts.
The circuit board carries the LM317 regulator with clip-on heat sink.
The front panel carries the indicator LED, voltage control, and output terminals.
The rear panel carries two battery boxes, battery on/off switch and the mains adaptor connector.