This 1970s RCA circuit can be triggered by light or dark, depending on how the LDR is connected. The controlled load depends on the triac.
We found this conventional source with power transistors in a 1997 publication. The output voltage...
This circuit was found in a 1964 documentation. It shows how to achieve automatic gain control for...
This circuit amplifies VHF signals in the two-meter range and is very critical, especially...