This circuit uses a parallel resonant crystal to control the frequency. The circuit is from Radio Electronics magazine, February 1993. Equivalent transistors can be used.
This circuit was found in the March 1994 issue of Electronics Now magazine. The circuit uses a...
This 1965 General Electric circuit uses a "Thyrector" that is a suppressor of the time. The...
Originally in 1986, this circuit was developed to operate with microcomputers of the time like the...