Kevin Weddle
- Feb 23, 2004
- 1,620
- Joined
- Feb 23, 2004
- Messages
- 1,620
What is the construction of a light bulb dimmer?
audioguru2
- Apr 6, 2004
- 12,026
- Joined
- Apr 6, 2004
- Messages
- 12,026
Hi Kevin, welcome back. ;D
The 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/
The 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/
Kevin Weddle
- Feb 23, 2004
- 1,620
- Joined
- Feb 23, 2004
- Messages
- 1,620
Hi
Last edited by a moderator:
A
Alun
- Jan 1, 1970
- 0
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.
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.
audioguru2
- Apr 6, 2004
- 12,026
- Joined
- Apr 6, 2004
- Messages
- 12,026
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
