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From Ben Krasnow's new YouTube channel: Make a microgram scale from an old panel meter! - Adventures in Engineering
The wanderings of a modern ronin.

Ben Cantrick
  Date: 2014-06-15 17:21
  Subject:   From Ben Krasnow's new YouTube channel: Make a microgram scale from an old panel meter!
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That is really cool. I suspect the opto he used had a Schmitt trigger output. The circuit would work even better with a true analog output opto...

http://www.youtube.com/watch?v=ta7nlkI5K5g
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