Gasoline engine tachometer

Posted on May 13, 2012

This tachometer can be set up for any number of cylinders by linking the appropriate timing resistor as illustrated. A 500 ohm trim resistor can be used to set up final calibration

Gasoline engine tachometer
Click here to download the full size of the above Circuit.

A protection circuit composed of a 10 ohm resistor and a zener diode is also shown as a safety precaution against the transients which are to be found in automobiles.

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