Found in old documentation, this circuit uses a double gate MOSFET. The operating frequencies depend on the coil, and the indicator is a microammeter.
This circuit is from an English publication from 1978. The transistors can be the BC548 and the...
The circuit shown in the figure can generate signals up to 1.6 GHz. Coil L1 and capacitor C2 are...
This circuit was found in an old publication about transistor. The original trasistors are...