We found this time base circuit in a timer project from the August 1972 Radio Electronics magazine. The circuit takes advantage of the 60 Hz signal from the power grid.
This circuit is from 1990 documentation. When we press D1 the lamp remains on for a time interval that...
This 1995 circuit uses interruption sensors or NC connected in series in any quantity. With the...
This circuit from a Radio Electronics magazine from June 1969 already shows the use of the newly...