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.
Panasonic AN44183A Microstepping Motor Driver is a two channel H-bridge driver with a bipolar...
The circuit shown was obtained from a 1976s publication for radio amateurs. Its purpose is to...
The frequency of this circuit is approximately 1 Hz. Whenever the output is at low level, the LED...