PowerSupply

An Arduino-controlled benchtop power supply

Features

3.8 to 19.5 VDC output
Up to 3A continuous current
Display voltage or current
RGB LED knob

Components

Arduino Pro Mini 328 (5v/16MHz)
40W Laptop charger for AC/DC conversion
Illuminated RGB encoder (Sparkfun COM-10982)
7-Segment LED display (x2)
SN74HC595N 8-bit Shift Register (x2)
200Ω resistor (16x)
MCP41HV51 high voltage digital potentiometer
22K resistor (4x for voltage divider)
ACS712 hall-effect current sensor (Sparkfun BOB-08882)
Toggle switch, max 15A DC (took this one from a vacuum cleaner)
4-contact spring terminal block (Digikey GC400-ND)
LM2596-based DC buck converter (x2)
A nifty aluminum box

PCB

Custom PCB schematics designed with CircuitMaker, available here

Planned Improvements