A general purpose dc power supply KIT

This kit combines an LM317 with a thumbwheel potentiometer to allow you to easily set the output voltage from 1.5V up to 2V less than the input. Three preset voltages (5, 9, 12V) can also be selected. Input power comes from an external source.
Features:

• Stable, low-noise output adjustable from 1.5 to 30V
• Supplies up to 500mA
• Preset outputs of 5V/9V/12V
• Integrated heatsink

A general purpose dc power supply KIT - [Link]