On Apr 3, 2011, at 9:05 AM, Olin Lathrop wrote:

> If you had a single strobe, the string would be frozen in space at =20
> one part of its cycle when exactly in tune.  When out of tune, it =20
> would appear to move thru its cycle at the beat frequency (amount =20
> out of tune).
>    :
> I assume the two strobes are fired 180 degrees apart.

I am not seeing how it behaves differently than a single LED operated =20
at twice the target frequency...

BillW

--=20
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