Circuits Archive

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Tach and Dwell Meter

This circuit as first published in Wireless World September 1975 and subsequently in MECRM.

It's built around a TTL quad NOR gate, though CMOS could be used (with minor alterations to the circuit).


Calibration details were given in the original article.

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First published: 22nd April 2002.
Page's Author: Richard Torrens
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