This common dimmer configuration is one of thousands that have appeared in electronics publications around the world. This one with a triac was found in October 1977 Radio Electronics magazine.
This circuit, from a 2002 documentation, checks the logic levels of the inputs, providing a...
Using a dual 555 CMOS this very useful circuit on the bench was found in the July 1998 Electronics Now...
The integrated circuit used in this regulator is quite old. Its 1970s casing is still made of...