This circuit emits a warning sound when night falls. The circuit is from a Hands On Electronics from the 90s. The Sensor is a common LDR and R6 adjusts the trigger point.
June 2017 - The new TE Connectivity FSJMI series of illuminated tactiles switches is now available in Mouser...
This circuit was found in an American documentation from the 80's. The sensor is a special...
This simple triac trigger switch with low current switch was found in the June 1970 Radio...