light dimmer

Discussion in 'The Projects Forum' started by sasek, Apr 7, 2010.

  1. sasek

    Thread Starter Member

    Jan 3, 2010
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    hai all,

    problem here is i want design a circuit of light dimmer. the concept i want to use is to control the light dimmer using pwm. could i do that??? if yes pls help me to find the basic concept to design the driver to read pwm signal then control the light. thanks 4 reading :)
     
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Yes. Look below at similar threads. More information would help, V,I,W, application, type of control, type of light" bulb ".
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Are you talking about controlling the intensity of LEDs or incandescent lamps being powered by a low voltage DC supply? If so, then yes; PWM is a good way to go.

    If you are talking about mains AC powered lamps, then PWM is not the way to go.

    Projects that are powered directly by the mains are not something suitable for beginners in electronics.
     
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  4. sasek

    Thread Starter Member

    Jan 3, 2010
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    is it posible if i use triac opthocoupler and give pwm to input opthocoupler
     
  5. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Using PWM on AC powered TRIAC will result in either ON or OFF[ 0% duty] as once triggered TRIAC will conduct a full half cycle, just to be triggered again on other half. Just buy commercial dimmer.
     
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  6. sasek

    Thread Starter Member

    Jan 3, 2010
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    thanks Bernard it very help me,

    before this i have try with LDR optocoupler and the result is same like u said, is it all optocoupler like that????.
     
  7. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    It is the signal driving the opto-coupler that makes the difference.
     
  8. sasek

    Thread Starter Member

    Jan 3, 2010
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    yes, i use pwm to drive the optocoupler. i try using moc3011 and moc3020
     
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