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 in a Popular Electronics of the 90s. The resistor R4 determines the load...
Found in a 1968 Motorola publication, this circuit generates a high-powered audio tone when...
The TL431 integrated circuit consists of a programmable shunt regulator with an internal...