This circuit uses a resonant reed switch at the trigger frequency. The circuit is from General Electric in a 1966 documentation. This type of component is rare today.
Found in Radio Electronics from the 90s, this circuit generates signals from 100 Hz to 1.5 kHz....
Operating in the range of 1.5 to 15 kHz, this sinusoidal oscillator is based on a 741 operational. The...
This circuit was obtained in a 1973s documentation. The transistors may be BC558 for the PNP and...