This circuit detects smoke by changing the light falling on the sensor. The circuit was found in the Electronics Experimenter's Handbook of 1991. Optical devices must be used.
The circuit presented was obtained from a 1976 Italian Radio Elettronica but can be easily...
Using the well-known CK722 and also the CK721, this signal follower or tracer was found in Radio...
This circuit was found in General Electric documentation from 1964. It makes use of a PUT, called the...