This configuration similar to many of this site was found in 1965 General Electric documentation. Modern equivalent transistors can be used. LEDs can be used.
Found in American documentation from the 1960s, this circuit employs power transistors of the...
This circuit uses a thermistor or NTC as a temperature sensor and provides the indication on an...
This is a dimmer version for incandescent lamps (do not use any other type) from an old...