This circuit uses an LED (called SSL) to regulate current in a configuration with complementary transistors. The circuit is from 1970 General Electric documentation.
This 6V microsupply with just 2mA current uses a common 1N34 germanium diode. The circuit was...
This electronic siren circuit, found in a 1982 documentation, uses three oscillators mounted...
This integrated circuit is recommended as a standard amplifier in sound equipment, TV sets,...