Electronics Workbench Circuit File Version: 5 Charset: ANSI Description: "The lamp dimmer uses a triac to control the AC voltage across the switch. The potentiometer \"P\" changes the voltage appearing across the diac which in turn controls the firing angle of the triac." "Press \"Shift + P\" to increase the pot and hence, increase the firing angle thereby dimming the lamp. Make the lamp brighter by pressing \"P\" to decrease the pot and the firing angle." 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