Found in the September 1982 issue of Radio Electronics magazine, this circuit triggers a relay intermittently. Triggering is done by a reed switch, but other types of sensors can be used.
In the original 2000, this circuit was designed to interface the parallel port with external...
The author has many books he had written in Eglish (See the Biography) published by famous...
This circuit, to add the ambience effect, was suggested by National Semiconductor in documentation...