[sdiy] Tonewheel questions

[Tom Arnold]

On Fri, May 28, 2004 at 07:27:27AM -0700, Harry Bissell Jr wrote:
> My method would be to use retro-reflective optical
> sensors on a 12" diameter cardboard disk carried on
> a turntable platter.  speed control would be
> excellent.
> You could use white cardboard and black magic marker.
> Different frequencies could occupy different positions
> on the disk

Sounds like an Optigon.  

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 - Tom Arnold -       When I was small, I was in love,                  - 
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