4QD TEC Circuits Archive Automobile Circuits
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.
© 2001- RJT
First published: 22nd April 2002.
Page's Author: Richard Torrens