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 power supply was found in the December 1993 issue of Electronics Now magazine. Power...
This circuit suggested by Texas Instruments, operates with pulses, and is based on an operational...
This fast-acting circuit uses a 555. We found it in the November 1992 Radio Electronics magazine. The...