We found this version of the automotive tachometer in a 1980s publication. Variations from other sources appear elsewhere in this section. The indicator is a 0 to 1 mA milliammeter.
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
The circuit shown in the figure below is suggested by ON Semiconductor (www.onsemi.com), based on...
This old circuit is from the era of analog televisions, serving for technicians to make...