Found in a manufacturer documentation from the 90s, this circuit makes use of period components. The configuration can be adapted to use modern equivalent components.
Found in an Electronics World of 1966 this circuit is intended for use with a microphone as an...
This simple power source with only one transistor can be used in the laboratory, without overload...
This circuit, found in 2002 documentation, triggers LEDs when a phone call is received. The LEDs...