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, found in a 1982 documentation, consists of a small inverter based on a Hartley...
This circuit was obtained in a technical publication from the 1970s. It fires a diac and thus a...
With this circuit, found in an English publication in 1983, it is possible to control an...