A Super Simple UV Flashlight

Portable blacklight!

Materials:

1. 9 volt battery

2. A momentary push button switch or other switch of your flavor

3. LEDs of your choice. I used UV considering it doesn’t need a resistor to run off of a 9v battery

4. Resistor (depends on the voltage of the LEDs used, with UV, a resistor isn’t needed (2x4.5v=9v))

5. A case to put it all in

Tools:

1. A soldering iron

2. Solder

3. Drill bit and drill

4. Electrical tape

5. Wire cutter

Drill the necessary number of holes in the case where you want the LEDs to be.

Drill holes for the switch and do a test fit.

Solder the LEDs in series taking care that they have the right spacing for the holes that were drilled.

Solder wires onto the legs of the switch as shown.

Fit the switch into position. The holes that were previously drilled may have to be enlarged slightly for the wires to go through.

Solder the rest of the connections as shown.

Add tape where necessary and put it back together. You now have a simple flashlight!

Schematic!

To get the PDF for this and more go here or here. Don't be shy, most of my stuff is free.