triac on 12v

Discussion in 'General Electronics Chat' started by markosillypig, Aug 29, 2013.

  1. markosillypig

    Thread Starter Active Member

    Jul 21, 2008
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  2. #12

    Expert

    Nov 30, 2010
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    It's rated for 600 volts maximum so I believe it will work with 12 volts.
     
  3. nigelwright7557

    Senior Member

    May 10, 2008
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    I don't think a triac will work on DC.
    If I remember correctly it needs the volts across it to go to zero before it can switch off.
    But, I could be wrong.
     
  4. markosillypig

    Thread Starter Active Member

    Jul 21, 2008
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    could i use a tip120 if i get the Vces to 2V ?
     
  5. #12

    Expert

    Nov 30, 2010
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    nigel is wright, but you aren't telling us the circuit. There is nothing here except guessing if you don't tell what circuit you are trying to make.
     
  6. markosillypig

    Thread Starter Active Member

    Jul 21, 2008
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    i will photo circuit and add components to the image this weekend thanks any way
    marko
     
  7. markosillypig

    Thread Starter Active Member

    Jul 21, 2008
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    uploaded photo's for you all to see
    thanks
    marko
     
  8. #12

    Expert

    Nov 30, 2010
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    Again, nigel is wright. You can't use triacs to supply DC because they will never turn off. Your circuit depends on the polarity change of the AC power to shut down after each "on" event.

    A TIP120 is a Darlington, so it has a chance of working with a 12V DC supply, but you will have to redesign the circuit to make sure it will work.
     
  9. markosillypig

    Thread Starter Active Member

    Jul 21, 2008
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    ok
    so if i keep this circuit the same could i add a bank of 4 other transistors side by side to the existing outputs but just use a + or - v 12v supply to them ?
    what i am trying to achieve is to replace the 230v bulbs with 12v led's
     
  10. #12

    Expert

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    Start by making a schematic of the board then redesign it to use 12 volts.
     
  11. MaxHeadRoom

    Expert

    Jul 18, 2013
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    If there is an AC source to the items (lights?) you want control (transformer secondary?) and it is via a bridge rectifier, put the Triac before the bridge!.
    IOW in the AC side of the rectifier.
    Max.
     
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