I am thinking about building a PIC based flasher that flashes to the 
beat of the music.  I am sure that it has been done before, I just can 
not seem to find it via Google or on the PIC_List archives.

One way is to have a low pass Op-Amp filter that connects to the PIC A/D 
input or Comparator input and either turns the LED on or off when ever a 
signal edge is detected.  I keep thinking that there has to be an easier 
way.  How do the cheep designs do this?  A passive low pass filter seems 
like it would load the driving circuit, so I am assuming that it 
requires an Op-Amp.

Any pointers would be greatly appreciated.

Phil



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