RF or even switching transistors like the 2N2222 can be used in this circuit. The capacitors are ceramic and the frequency is determined by the crystal.
The circuit shown by the figure below can produce signals in the range between 20 kHz and 30 kHz....
In the figure we show yet another CMOS component based voltage controlled oscillator circuit. The...
We find this circuit in a documentation for engineers from 1971. The circuit generates rectangular and...