On Sun, 23 Jul 2006, Russell McMahon wrote:
>
> Optical method
>
>        http://www.elecdesign.com/Articles/Index.cfm?AD=1&ArticleID=3597
> .. .
>
> Circuit
>
>        http://www.elecdesign.com/Files/29/3597/Figure_01.gif .. .
>


Great! Exactly what I was aiming for... I probably wouldn't have managed
to design the complete thing, but it's what I had in mind. I'll need to
SPICE this circuit, because I don't understand what those transistors
do.



Thanks a bunch,
Christian VA2CBW
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