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.
This circuit was found in a 1970 American publication. The FETs are power types according to the...
This circuit is from a 1974 publication. It generates a pulse with several sinusoidal cycles from...
Suggested by Philips in 1966 documentation, this limiter can be found elsewhere on this website....