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Step 12Build the light circuit
Using a joule thief circuit, we can power all four LEDs with a single 1.5V battery!
There's already many great instructables and other online guides on how to make a joule thief (here, for example) so I won't go into too much detail here.
The LEDs are wired up in pairs. The ferrite toroid and resistor is stuck to the side of the battery case, and the whole assembly is glued to the back of the helmet. The wires leading to each pair of LEDs naturally should be long enough to reach the holes. The wires leading the switch should also be long.
Glue the LED wires along the sides of the helmet, and the switch to a convenient place at the base of the helmet.
Insert the LEDs into the holes drilled earlier, and glue them in place.
There's already many great instructables and other online guides on how to make a joule thief (here, for example) so I won't go into too much detail here.
The LEDs are wired up in pairs. The ferrite toroid and resistor is stuck to the side of the battery case, and the whole assembly is glued to the back of the helmet. The wires leading to each pair of LEDs naturally should be long enough to reach the holes. The wires leading the switch should also be long.
Glue the LED wires along the sides of the helmet, and the switch to a convenient place at the base of the helmet.
Insert the LEDs into the holes drilled earlier, and glue them in place.
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