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Discussion in 'Lights - Store Bought and Home Made' started by Tigion, Jul 2, 2014.

  1. Tigion

    Tigion New Elf

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    want to convert this to dc these are the specs
    input 240v AC 50hz
    output 36v Max 15.6VA
    Bulb Raiting 3v 20ma 0.06w
    Total Wattage 14 w


    there seems to be a controller that makes it shimmer if i cut it before controller will it still shimmer or will i still have just on and off
     

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  2. David_AVD

    David_AVD Bite my shiny metal ass!

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    Without seeing it I would guess that without the controller it will be steady on. 36V sounds like one of the newer switchmode (light weight) plugpacks which are DC.
     
  3. OP
    OP
    Tigion

    Tigion New Elf

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    im so confused plugback DC ? it has a transformer maybe i should take more pics of it
     
  4. David_AVD

    David_AVD Bite my shiny metal ass!

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    Maybe take a picture of the plugpack so we can see the text on it.
     
  5. OP
    OP
    Tigion

    Tigion New Elf

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    here we go
     

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  6. David_AVD

    David_AVD Bite my shiny metal ass!

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    Hmmm... 36V AC according to the plugpack (the ~ sign next to the 36V).

    That's a potential issue as you may need 45V DC or so to drive them via a DC controller.

    Probably not in the easily hackable category unfortunately.
     
  7. scamper

    scamper Senior Elf

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    second giveaway would be calling it 15.6va. the va (volt/amps) it the AC way of saying Watts (power)
     
  8. OP
    OP
    Tigion

    Tigion New Elf

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    great now i have no sign for x mass
     
  9. i13

    i13 Senior Elf

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    There is still another option. If you want to control it with DC you could use a relay and keep all of the original parts. This is an easy option but you won't be able to dim it, just on or off. Do not put the relay on the high voltage side.

    It might still be possible (but not super easy) to convert.
     
  10. David_AVD

    David_AVD Bite my shiny metal ass!

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    I wasn't sure if the OP wanted to control the sign in a more custom way or if on/off control all they want.

    Using a relay driven from the output of a DC controller is certainly an option. Don't forget the diode in parallel with the relay coil (cathode to V+) to protect the controller output.

    The other option is to control the plugpack with an AC controller, but the relay option would be safer. Either way don't go switching the sign on and off rapidly.
     
  11. Kaden

    Kaden Pixels! I need more pixels!

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    Why not put the relay after that AC power supply (where it is 35v) that way you can switch it as fast as you want (if this had a multifunction controller you could multiple relays, one for each channel)
     
  12. David_AVD

    David_AVD Bite my shiny metal ass!

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    Yeah, that's what I meant. Switch the 36V AC line. When I mentioned speed I meant you couldn't really switch it on and off many times per second as A) the relay contacts won't like it, and B) the MFC may not like it.
     
  13. BundyRoy

    BundyRoy Senior Elf

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    But if you're using a DC to control the relay for on/off and still using the AC power pack anf MFC to run the lights then this won't help alleviate the problems with the light shimmering mentioned by Tigion will it? Or am I misunderstanding something.
     
  14. David_AVD

    David_AVD Bite my shiny metal ass!

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    The shimmering is a feature of the MFC by the sound of it. Only he can say whether he wants that effect of full control.
     

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