On Wed, 29 Dec 2010 08:18:50 -0500, "Olin Lathrop" said:

> What I came up with is only for one-off use, but it worked nicely.  Use
> two
> LEDs and two light-dependent resistors.  I had the analog circuit drive
> the
> two LEDs in opposition smoothly.  When the voltage was at either extreme,
> one LED would be on brightly.  In the middle they were both on somewhat.
> This has the added advantage of the control and controlled circuits being
> optically isolated.

I seriously considered this, but it's been a long time since I bought
any cds cells except from places like Radio Shack, and I was concerned
about channel matching.

Thanks,

Bob


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