This circuit automatically turns off small battery-powered devices after a certain amount of time, saving battery life. We found it in a Popular Electronics from the 90s.
This circuit was found in the December 1995 issue of Electronics Now magazine. The circuit...
In the figure we have the photo-conductive way of using a photocell to control a small motor with...
This circuit, which can be used on percussion instruments, has the oscillation point adjustment made in...