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 can be used in alarms by activating a relay or a current load that depends on the...
This circuit is from the 1968 ARLL documentation. The MOSFET admits equivalent and the coil...
Figure bellow shows how one of the two separated counters found inside the 4518 is used as a...