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Use OP AMPs. I'm not exactly sure how to do it, but I believe it involves hooking them up in series with different values of transistors between them. The rheostat can control the amount of current that will go into the series. I'm sorry for my vague answer (I know next to nothing about...
Please keep in mind that I have absolutely no experience with building or designing circuits.
I'm trying to get LED's to light up in sync with some music (The louder the music is, the brighter the LED's will glow). To do this, I am utilizing unused RCA audio outputs from my car's stereo system...
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