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.
This is a possible setting for a Colpitts oscillator operating in the audio track. The shunt coil...
We found this circuit in a European publication of the 1980s. The transistor could be the BC549. The...
This programmable circuit emits a signal that can be sensed by the dog at a distance. The circuit is...