This circuit generates frequencies determined by R3 and C1. We found it in the Radio Electronics magazine of May 1988. The power supply must be symmetrical.
This circuit was obtained from a 1967 General Electric documentation. The circuit makes use of...
This configuration uses the 4 gates of a 7401 integrated circuit. The capacitors determine the...
This filter can be used to eliminate hum in sound equipment. Operational amplifiers can be 741 and...