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 amplifier was found in an 80s component manual. The circuit can be used for media recovery....
When the sensor X1 is opened, the relay is energized. When waiting, the current drained is very...
We find this circuit in an earlier American publication of 1978. The components are no longer...