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 was found in General Electric documentation from 1964. It makes use of a PUT, called the...
The circuit shown in the figure is suggested by ON Semiconductor (www.onsemi.com), based on its...
This circuit for discharging NiCad batteries limits the current to a value that can be adjusted in the...