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.
Found in a 90s Elektor, this circuit is based on a Maxim integrated circuit of the time. The...
No information is given about the transformers in this circuit suggested by Motorola in a 1968...
This circuit was found in the January 1996 issue of Electronics Now magazine. The circuit is...