- Small project box (3"x2"x1")
- A piece of 2-sided copper clad PC board (2"x2")
- CR2032 Button Battery holder
- CR2032 Button Battery
- Small peice of wire (not in picture)
Optional potentimeter to be able to turn voltage down for LEDs that require lower voltages. I built it to test 3-4VDC LEDs, so running just a 3VDC button battery worked for me, but I am going to add the adjustability later.
(I bought everything at Radio Shack. I'm lucky enough to live in a college town with a large engineering school, so the Radio Shack actually still carries components.)