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Hey thanks. I didn't know that about the LM339 that when both inputs are above the common input mode voltage the output transistor conducts (output goes low just as when IN- > IN+). It's so clearly stated in section 126.96.36.199 on page 12, the last bullet item of the documented you linked in above. Wow, thought I knew everything ... but didn't. It's a pretty cool project. Thanks again.
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