This long interval timer was found in the September 1976 issue of Radio Electronics magazine. The output can be used to control a relay. The circuit achieves timings of up to 14 hours.
This traditional dimmer configuration for incandescent lamps and heating elements was found in an...
This is another possible version of a negative voltage generator using a 555 integrated circuit. The...
A wire vibrating between the poles of a magnet works as a frequency pattern in this oscillator found in...