Found in Popular Electronics from the 90s, this circuit can be used in tachometers. The integrated circuit is not a common component today.
Three of the four gates found in a 4001 can be used to perform as an AND gate. This improvisation...
This circuit generates a train of pulses that depends on the time that is pressed PB and the value of...
This circuit for the 85 to 95 MHz band has a gain of 15 dB. We find it in a 1980s documentation. The...