Advice please: 120V Mains > 12V circuit design (Beginner)

Discussion in 'The Projects Forum' started by Dreaming Nomad, Mar 18, 2016.

  1. Dreaming Nomad

    Thread Starter New Member

    Mar 18, 2016
    1
    0
    Howdy neighbors,
    Long time lurker, first time poster. I'm not formally trained or educated - I just enjoy studying and reading about electronics and electrical theory (and making cool shit) in my free time.

    Earlier today I salvaged some CCFL bulbs out of an old LCD monitor and want to build a night light/lamp with them. I quickly put together an inverter, which works, but I'm having trouble getting the CFLs to 100% power.
    9V batteries die rapidly and only partially light them up. My PSU transformer has a 12V 0.25A output which brilliantly illuminates two ccfls in series, but I need that to power my circuits. Plus, it's friggin huge as hell and weighs like 20lbs.

    I do have a 120-12V CoilCraft Transformer (http://www.coilcraft.com/ncp101x.cfm) but I'm not sure exactly how to hook it up. I don't have much experience with wall power and I've only just begun to research transformer theory. My protoboard has a big transformer that plugs directly into a wall socket, but I'm guessing it's not a good idea to do that with a smaller one... (I know this because I already tried and it caught on fire right away.)

    So how do I connect my transformer to wall socket 120V without melting it? Do I need to use the right resistor with enough heat dissipation? Or what?

    Somebody holler some truth in mah freakin face!
     
  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    5,003
    745
    Get a smpsu that gives out 12v @2 amps or more.
     
    Last edited: Mar 18, 2016
  3. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
    1,149
    205
    I'm confused. You don;t really mention if it's AC or DC. I just hope you didn't use the transformer without the integrated circuit?

    See http://www.onsemi.com/pub_link/Collateral/NCP1010-D.PDF


    Is also confusing, Full wave rectified and filtered will give you a 12*1.414 DC power supply/
     
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