This circuit for the medium wave range was suggested by a Popular Electronics from the 90s. The double port MOSFET is an unusual component today.
This transistorized oscillator, a modification of the Colpitts oscillator, was found in the...
This circuit uses a CA3140, an operational amplifier with FETs in the input stages. Equivalent can be...
This signal injector and tracer (follower) was found in an old American documentation. The...