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This instructable shows how to modify a pair of speakers to also pulse an LED (or multiple leds, you choice) to the beat.
For this project you shouldn't even need to buy anything You need: A pair of speakers (or one, whatever you want) 1 bright led (I chose red because...
Open up the speaker. Usually all the screws come out except one, so you just pull the case apart and it'll pop out.
see that big metal thing? That's a speaker. If any wires are coming off of it (like another speaker) that's easier to reach, then just use that. I ...
attach either a wire or aligator clips to each connector. connect the other ends of the wire or aligator clip to your led. Even though it's an led, ...
turn you speakers up and play music until the led is reactive. It starts being reactive at about 25%, but then (for me) it was best at half as loud a...
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