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.
Found in a 90’s 303 Circuits, this circuit uses components that are still common and has a common...
We found this circuit in a publication from the 1980s. Transistors are high voltage types of the...
This low current circuit allows the regulation of voltages in the range of 0.5 to 30 V. We find it...