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.
The purpose of this circuit is to extend the range of frequency meters (typically up to 30 MHz) to...
This basic configuration of an astable multivibrator was found in a publication of the year 1968....
The frequency of TTL square signal is divide by 5 with this circuit. Power supply is 5 V and the...