This circuit is from the 1968 ARLL documentation. The MOSFET admits equivalent and the coil determines the operating frequency range being the plug type.
With this circuit it is possible to vary the resistance by adjusting the mark/space reaction of...
This circuit is from a 1967 US publication. The configuration can serve as a basis for designs...
This analog TV circuit can be used on a small transmitter. The circuit is from an 80's American...