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 circuit has a duty cycle of 50%. We found it in old English documentation. The center...
Two NAND gates are used in the configuration shown here to perform as a monostable triggered by...
This circuit is from a 1976l filter cookbook. The circuit has a factor Q = 3, and must be supplied...