Found in a 1966’s General Electric documentation, this circuit uses a triple diode from the time. The output current is 5 mA. It serves as a voltage reference.
The CK722 transistor used in this circuit is one of the first commercial types in the world. The...
This automatic dimmer for incandescent lamps was found in a European publication from the 1980s. The...
This traditional doubler configuration with the 555 can be found in other articles on the author’s site....