This circuit was found in a Popular Electronics from the 80s. It is possible to control a relay from a video signal. The circuit was used in video recorders of the time.
This simple alarm circuit was found in a 1998 documentation. When the sensors are activated, the...
This circuit was found in an old American documentation. The integrated circuit used is uncommon...
Found in a 90s Electronic Design, this suggestion to have a higher voltage in a fixed regulator...