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.
Depending on the components, given in the table, this circuit can amplify signals of 100 MHz or...
Found in Ferranti's 1969 documentation this circuit has a maximum operating frequency of 7.5 MHz....
An interesting interface solution that can be provided in some cases is the one shown in the...