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.
B12127E) This circuit was found in an English publication from 1992. An integrated circuit 4017...
This trigger produces an output pulse when zeroing the input signal. The circuit is from a...
In fact, this circuit found in a 1992 documentation does not have all this power. It consists of a...