This circuit was obtained from an American 1980s documentation. The frequency depends on the crystal and the circuit may be a PNP that reaches the generated frequency.
Some of the components used in this circuit are not very common today. The circuit is from a 1996...
This circuit multiplies the frequency of a signal by 100. The circuit was found in the October 1994...
We found this circuit in a 1978 documentation. The SCR conducts when the regulator's output...