This circuit, which is present in other points of this website, was found in a 90s Hands On Electronics. The circuit activates a buzzer with an oscillator.
This circuit triggers a relay when the phone rings. An application is like remote doorbell. The circuit...
This simple CMOS circuit generates two-frequency signals for use as a signal injector. The circuit...
With a mains-rated transformer and 1:1 winding this benchtop circuit was found in the January 1995...