This circuit triggers a Sonalarme when the LED used as a sensor receives light. The circuit was found in an old documentation, but the components used are all current.
This circuit was taken from the 1967 General Electric SCR Manual. The circuit can use virtually any...
Found in National Semiconductor documentation from the 1980s, this circuit employs a power...
The different aspect of this source is the use of a 12 V lamp as a current regulator together with a...