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 is designed to trigger a xenon lamp from a switch. The circuit was found in the May...
This circuit was found in a Hands On Electronics from the 90s. It is intended to supply old tape...
This amplifier uses a 1975 integrated circuit, which is uncommon today. The circuit has a gain of 30...