This configuration is from a 1964 US documentation valid for any FET. The range of power voltages depends on the application.
This circuit uses the 7815 regulator to obtain a voltage for motor control num shield for PC. The...
This circuit simulates a UJT, with two bipolar transistor. Frequency is given by C1 and P1...
This circuit uses a metal enclosed transistor as a temperature sensor. The circuit is from an old...