Found in American documentation from the 90's, this circuit oscillates up to 150 MHz. The transistor supports an equivalent and the diode is general-purpose.
This short-range circuit can act as a wireless microphone. We got the schematic and the printed...
This oscillator can be used to generate sinusoidal signals from less than 1 Hz to close to 20 kHz....
This circuit is from an American documentation of the 1980s. The circuit can be implemented with more...