This circuit was found in a 1992 publication. What it does is to light an external lamp when it gets dark. The trigger point adjustment is made in a potentiometer or trimpot and the sensor is a common LDR.
June 2017 - Mouser Electronics already has the new Vishay DG series analog switches in stock. The...
If the reader needs to monitor a voltage and does not want an expensive or sophisticated solution. In...
The circuit with a common operational amplifier uses a zener as a reference. The circuit is from...