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Re: Terry's DRSSTC - All Ready!!
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- Subject: Re: Terry's DRSSTC - All Ready!!
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- Date: Thu, 03 Mar 2005 00:56:19 -0700
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Original poster: "Black Moon" <black_moons@xxxxxxxxxxx>
The clouds cleared, the birds sang, and the darn things stared working
perfectly!!!!!!!!!! Too much negative input to the LM339 messed it up
and made it false trip. The Schottkys fixed that right up!!!
Great. You still have zero margin (spec wise). Alternatively, you could
clamp to +0.6V instead of ground and get the diode drop completely out of
the picture. Sorta like the diode compensation for a push/pull audio
power amp using complementry bipolar transistors. One extra diode and
resistor might do. Or you could bias the CT at Vdd/2 and eliminate need
for clamping
TI makes some wonderful 'supply spliter' IC's, rated for about 20ma~ or so
with great precision.
Gerry R