This circuit was published in the July 1993 issue of Electronics Now magazine. It uses a sensor from the time and triggers a buzzer with a Sonalert-type oscillator.
This traditional triac dimmer configuration was obtained in a 1987 documentation. The circuit can...
This bandpass filter has a simple feedback system. The component values can be calculated using the...
The 709 integrated circuit is not common today. The circuit is from American technical...