We found this circuit in 1969 American documentation. FETs admit equivalents, as do transistors. The circuit can be used as a shield.
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...