With the setup for the Tic-Tac flashlight, the voltage produced by the magnet alone may not be enough to power up the LED. It is possible that the only reason the LED lit up was due to the rechargable battery not being completely empty in the first place. This theoretical experiment attempts to improve on the circuit based on one of the comments made on "Shake it like a Tic-Tac!"
Image taken from Shake it like a Tic-Tac! page.
Step 1: Parts Needed
Magnet 20 mm in Diameter x 1
470u Electrolytics x 2
White LED x 1
Magnet Wire x 300 ft
Ballpen case or some hollow cylindrical tube that can fit the magnets and accommodate the coils of wire
Step 2: Making the Magnet Tube and Wire Coil Tubes
Step 3: Making the Wire Coils
This is perhaps the most boring and time-consuming part, but it is crucial, as this is how the electricity will be generated.
What is important to consider is that the coil should be larger than the diameter of the wire in order for the maximum voltage to be generated.
Step 4: Assembling the Circuit
Basically, the circuit itself is in series, and it follows this diagram:
The coils actually sit flat against the slide (against the side of the magnet) as shown in the diagram below. You must get the end of the magnet to fully pass though the coil so the voltage will be a maximum. Thats why the slide extends past the coils at the top and bottom of the diagram.
You can solder the circuit together and, there you'll have it.
Step 5: Final Notes
1.6v + 0.6v = 2.2v, and that is the voltage the coil needs to produce.
It is good that there are electrolytics in the circuit, since these will keep the LED illuminated for the time it takes for the magnet to make another pass through the coils.
If the LED still does not light up after following the instructions, be sure to check your connections to see if anything is loose.
Perhaps the LED itself may be busted, so be sure to check that out as well.