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.
This circuit was found the Optoelectronics Sourcebook by Texas Instruments. Any phototransistor...
This traditional photodiode amplifier configuration uses an operational one that is no longer...
Figure bellow shows how one of the two separated counters found inside the 4518 is used as a...