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 variable frequency oscillator generates signals that have a recurrence frequency determined by...
Found in a 1988 publication, this 455 kHz crystal oscillator circuit is used to calibrate AM...
We found this conventional flasher by activating a relay in a 1987 documentation. The circuit...