This crystal oscillator generates a 20 MHz signal. Equivalent transistors such as BF494 and 2N2222 can be used. The stabilizing diodes can be 1N4148.
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This project from a 1983 publication can be assembled using more modern transistors. We can use...
The circuit shown in the figure is the version activated at the low level, of the previous circuit...