This circuit for AC loads was found in February 1976, Radio Electronics magazine. The triac is common, and the times are given by the 20 MΩ resistor and the 1 uF capacitor.
This circuit can be used to recognize a tone by its frequency. When this tone is present in a...
We have many versions of biofeedback with the 555 IC on this site. This is another one. We found it...
In fact, it is a night light system that automatically turns on the outside lights when it gets...