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 3-transistor circuit is from a 1963 publication. The transistors are from the time, but the...
This circuit incorporates the passive control of the previous circuit and was also found in the...
This voltage regulator was obtained in the SGS manual of linear integrated circuits of 1982. The...