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.
We found this circuit with JFETs in a Radio Electronics magazine from June 1969. The circuit has...
This detector with ultra-low deviation was found in an American documentation from the 90s....
This circuit is connected to the input of a good amplifier serving as a follower of audio signals or...