Kevin Weddle Posted June 11, 2005 Report Share Posted June 11, 2005 What is the construction of a light bulb dimmer? Quote Link to comment Share on other sites More sharing options...
audioguru Posted June 11, 2005 Report Share Posted June 11, 2005 Hi Kevin, welcome back. ;DThe 120V AC light bulb dimmer circuit in our projects section might work, but nowadays, a Diac is used instead of its neon light bulb for triggering the Triac.http://www.electronics-lab.com/projects/motor_light/029/ Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted June 11, 2005 Author Report Share Posted June 11, 2005 Hi Quote Link to comment Share on other sites More sharing options...
trigger Posted June 11, 2005 Report Share Posted June 11, 2005 some low cost dimmer will use SCR + diac circuit... Quote Link to comment Share on other sites More sharing options...
Guest Alun Posted June 11, 2005 Report Share Posted June 11, 2005 SCR dimmers aren't used in practice because an SCR onle passes half the AC cycle so them maximum power available is 50%. We studied only an SCR dimmer in college because it's easier to understand and veiw the waveform on a scope.A neon lamp and diac are electrically the same thing, the reach a certain breakdown voltage and then turn on, this is needed to make the triggering of the traic more reliable. Quote Link to comment Share on other sites More sharing options...
audioguru Posted June 11, 2005 Report Share Posted June 11, 2005 I don't know if our project was designed with a neon bulb instead of a Diac because either a neon bulb was on hand, or because the Diac wasn't invented yet. ;D Quote Link to comment Share on other sites More sharing options...
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