Step 1: What You Need:
- A cheap LED headlamp with a flashing/strobe setting
- 3 volt button cell batteries (I used cr2025 batteries)
- A multi-tool or a knife and wire strippers
- Duct tape
Step 2: Dissasembling the Headlamp
- Strip the ends of the battery wires to expose about 1/4" of bare wire. This is a delicate step, since the battery wires are likely weakly connected to the circuit and may break off.
Step 3: Powering the Circuit
- Determine which battery wire is positive and which is negative. Check where the wires are soldered to the circuit, there should be positive and negative signs there.
- Use a small piece of duct tape to hold the positive wire to the positive side of one button cell. Use another to hold the negative wire to the negative side of the other button cell. Then duct tape the two button cells together. If you only needed one button cell, simply tape the positive wire to the positive side and the negative wire to the negative side.
- Turn on the circuit to make sure it still works.