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~125V DC Power Supply

Discussion in 'Electronics & Electrics' started by JohnZ, Jun 17, 2010.

  1. JohnZ

    JohnZ Member

    Joined:
    Dec 21, 2007
    Messages:
    373
    Location:
    RAdelaide
    I'm just about to start putting together a VU meter that outputs to nixie tubes as per this website:

    http://tchips.com/home/index.php?option=com_content&task=view&id=35&Itemid=1

    However, I have no idea how to safely convert say a 12V DC plugpack from Jaycar to ~125V to power the IN-13 nixie tubes that I have...

    I found this spec sheet: http://www.tube-tester.com/sites/nixie/dat_arch/IN-13.pdf

    Which indicates that I need a maximum ~5mA of power per nixie tube (there are 14 all together) which is about 70mA all up.

    Are there any prebuilt units I can buy for a reasonable amount or and PCBs I can get as well as components?
     
  2. mobs

    mobs Member

    Joined:
    Jul 8, 2009
    Messages:
    137
    back to back transformers.

    ...........AC Plugpack............Reversed Transformer..............Bridge rectfier
    240VAC------------->9VAC----------------------------> ??VAC ----------------->DC


    Plugpack = 240v to 9vac
    transformer = 240v to 24vac (with 9vac from plugpack applied on 24v side)
    rectifier + capacitors on the 240v side of the transformer should get you right around your target voltage.
     
  3. dohzer

    dohzer Member

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    Jan 5, 2002
    Messages:
    5,452
    Location:
    Melbourne
    I'm a little confused by your post, mobs, but doesn't he want 125VDC, not ~12VDC? Or is that what the setup in your post achieves?

    I had a similar question when I needed a +110VDC supply, and people suggested one of the step-down transformers with rectifier and capacitors, etc. That would probably work for you, but obviously you'd need the correct ratio transformer that produces a voltage that is rectified to 125VDC. Not sure if that is "safe" enough for you though.
     
  4. Goth

    Goth Grumpy Member

    Joined:
    Jun 22, 2002
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    240 VAC --> 9 VAC

    9 VAC --> 90 VAC (with a backwards 10:1 transformer intended as a 240VAC : 24 VAC stepdown transformer)

    After rectification and filtering, you get 127 V DC.
     

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