Using an LDR as a sensor and an operational amplifier this circuit was found in the Encyclopedia of Electronic Circuits volume 5 from 1995. The circuit triggers an optodiac.
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...