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.
This zero-crossing detector circuit produces an output pulse every time the input sinusoidal...
May 2017 - Mouser Electronics supplies a wide range of sources for LEDs from Mean Well with inputs for...
This sophisticated power supply for the laboratory of the maker or professional repaired was found...