Found in an old Popular Electronics this circuit appears in other variations on this site and in this section. It uses a 7-segment common anode LED display as an indicator.
This circuit was obtained from an ancient American documentation, but appears elsewhere in this...
Found in an Electronics World of 1968 this circuit can use any SCR and diodes depending on the...
This high power dimmer uses a unijunction transistor to trigger the triac. The triac is choosen...