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.
The four gates of a 40111 IC are used in thes two-out circuit. The output chages their state in a...
The sensor of this circuit is a 2N3055 transistor from which the housing cover has been removed to...
Found in the November 1984 issue of Radio Electronics magazine, this circuit is based on the CMOS...