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 is from Motorola's 1990 Linear Databook. The transistors allow equivalents and the...
This circuit, which may have appeared elsewhere on this site, is from the integrated...
The basis of this circuit is a National Semiconductor operational amplifier that functions as a...