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.
September 2017 - Würth Elektronik High Power Ultraviolet LEDs can be obtained from Mouser...
We found this circuit in the July 1994 issue of Electronics Now magazine. The circuit can use...
This circuit shows on the screen of an oscilloscope two signals alternately at a frequency that depends...