Make a simple triggerable strobe for taking action photos with.
You will need:
A working disposable camera flash unit, and the knowledge of how to use one safely
An Altoids tin
Soldering iron and solder
Wire (preferably stranded and solid core, but you could get away with either)
1 or 2 small electronics switches
Digital camera capable of taking long-exposure pictures, preferably with a remote
...and for the photos:
Thick card (I use cereal box card)
Something to take photos of (I use a .177 air pistol and sheets of ice or plastic cups and a Fireball gun- get creative)
You may also want:
Fan (for reducing flux smoke inhaled)
Small single AA battery holder
Two friends to help you take photos in darkness
Step 1: Remove flash circuit
If you have already done this, skip a step.
To open the camera, it may have screws holding the case together which you will need to remove, but most cameras just have plastic locking tabs holding the case on. Break these off, but avoid sticking a metal screwdriver into the case as shorting the wrong parts of the circuit board can wreck it. Once you have the flash unit out avoid touching the capacitor wires or exposed metal parts of the board until you have discharged the capacitor by shorting out the two wires with a metal object. I handle the board by the battery contacts (safe), the casing of the capacitor and the plastic front of the flash bulb.