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Old 04-12-2011, 12:24 PM   #11 (permalink)
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Originally Posted by glug View Post
I finally settled on an lm339 based comparator
339, or 393? Though it's a pretty basic comparator circuit that should work with many op-amps, your diagram says 393.
10uF might be overkill for the decoupling cap on your input. Also, electrolytic caps are polarized, and I think the polarity is backwards in that diagram. Try turning the cap around and/or a mylar cap (or something else unpolarized in the fraction-of-a-uF range) and see if that helps with limitations you're seeing.

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