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Subject: Re: how does an op amp work?
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Date: 11/17/02 at 10:38 AM
Posted by: Russ Kincaid
In Reply to: how does an op amp work? posted by Jason Warnett on 11/16/02 at 3:57 PM:
Note that ascii art does not work on this forum, but what you probably have is two voltage dividers with the moisture sensor in one leg. The "op amp" is connected as a comparator, when the + input is more positive than the - input, the output goes positive and turns on one LED. When the - input is more positive than the + input, the output goes low, turning on the other LED. Do a google.com search on "op amp theory" and check out this URL: http://horizon.ece.utexas.edu/~jacome/ee411/lectures/SL6.pdf
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