This OF-1 LO oscillator was found in a 1980s American documentation. The transistor can be any general-purpose and C1 / C2 are determined by the frequency.
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...