Im trying to flash an LED to music. I have tried to follow this article and calculate values but cannot get it to go. Basically what i think i need is:
- audio in
- through a low pass filter (isolate frquencies <200hz)
- output to a peak detector or Schmidt trigger of some sort
- trigger a pulse monostable (eg 555) for duration.
My trouble is i cannot work out a useful low pass and peak circuit. surely this has been done before!
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