I have always wanted to stick a little mirror to a speaker cone and
fire a laser at it while it is pumping out tunes.  It would have to
look impressive I think.

One day ....

Justin 

On 8/2/05, Phil Keller <Phil@pkeller.net> wrote:
> 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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