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Infinite RGB LED Cube
The figure in step 10 shows how to connect the ends of your strip to the circuit, and what switch are you looking for ?
So you are trying to power your lights using the current from your audio device ? That's never going to happen and is probably going to fry your audio output circuit. I think you should consult some of the other instructables which are based on the TIP31C, the circuit is pretty straightforward for that.
The Arduino Internet Gizmo
MAKALU modular origami sculpture - 6 woven pentagons
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