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.
This circuit was found in an Argentine publication from 1973. It uses a common AM coil (50 + 50...
Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be...
We found this circuit in an English publication from 1982. The transistors can be the BC548. We...