This circuit is from an American 80's documentation. The integrated circuit is from the time and the sensor consists of a smoke chamber measuring its transparency change.
This circuit was found in a 1967 General Electric manual. It is intended for the control of high...
This circuit with low impedance output and 900k input impedance was found in the October 1993...
Up to some minutes intervals can be obtained from this circuit. The circuit can use a lamp (or...