Introduction: A Super Simple UV Flashlight

About: Chemistry and electronics have been a staple in my life since I was 8 and have pretty much been my only hobbies although I have dabbled in herbalism, art, music, and various other areas as well.

Portable blacklight!

Step 1: Gather the 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


1. A soldering iron

2. Solder

3. Drill bit and drill

4. Electrical tape

5. Wire cutter

Step 2: Drilling for LEDs

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

Step 3: Drilling for Switch

Drill holes for the switch and do a test fit.

Step 4: Solder the LEDs

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

Step 5: Solder the Switch

Solder wires onto the legs of the switch as shown.

Step 6: Install the Switch

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

Step 7: Solder the Rest

Solder the rest of the connections as shown.

Step 8: Insulate

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

Step 9: Schematic


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