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 electronic soldering gun circuit was found in the December 1998 Electronics Now magazine. The article...
This circuit uses only passive components and must be tuned to the operating range. The circuit is...
This is a very simple configuration with a power transistor to control a DC motor from 3 to 12 V...