In the figure we have a simple way to produce tone in a piezoelectric transducer. The frequency depends on the capacitors and the supply can be done with voltages from 1.5 to 6 V.
This circuit was obtained from a National Semiconductor manual from the 1990s. The circuit employs a...
This circuit causes an LED to flash at a frequency determined by capacitor C1. The circuit can be...
Suggested by Fairchild in a 1980s publication, this multiplier uses operational amplifiers from that...