We find this oscillator in a 1980s documentation. The frequency depends on the crystal and the transistor used must be able to oscillate at the desired frequency.
This circuit is more elaborate than the previous one. It was obtained from an 80s circuit manual. The...
This is the circuit of an RCA Dimmer sold in 1967. With it it is possible to control a load up to...
This circuit uses a resonant reed switch at the trigger frequency. The circuit is from General...