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.
We find this circuit in a Popular Electronics of the 80's. The frequency range depends on C1 and...
The circuit shown in the figure uses general purpose NPN transistors and can be used to generate...
This circuit with a double-gate MOS transistor was found in a Popular Electronics from the 90's....