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Posted by Conor on April 13, 2010, 5:30 pm
I have, at the most, a very basic understanding of electronics. I'm working on a project that takes a line or mic level audio signal and splits the signal into 3 bands. each band activates an R, G or B LED. I want to keep it a simple as possible given my lack of experience and knowledge. are there any ICs that filter frequency that I can use? Thanks so much.

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Reply by Robert LaJeunesse on April 21, 2010, 9:53 am
Before you can select an IC you need to define how much overlap there will be in the frequency bands. That sets the filter sharpness so you can determine the number of poles required per filter.That said, you might be able to cheat in some manner and use a multi-band audio equalizer IC (such as the 5-band BA3812L) plus maybe an additional dual op-amp for the 2nd and 3rd outputs.

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