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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
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!