Unlike the previous circuit, the output of this one goes high in the window voltage range. The circuit is from Radio Electronics from June 1986 and is based on the CA3140.
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...