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.
LTC7841 PolyPhase® Synchronized Boost Controllers Mouser Announces Analog Devices LTC7841...
This is the basic version of a small audio oscillator with the LM3909. The circuit must be powered...
We found this circuit in a 1980s documentation. The circuit uses general purpose transistors,...