Voltage question

Discussion in 'The Projects Forum' started by rpw, Jan 11, 2007.

  1. rpw

    Thread Starter New Member

    Jan 11, 2007
    1
    0
    First of all, what a great resource. I'm glad to have found this forum.

    If anyone is willing, I have, what is for most of you, a simple circuit question that I am unable to figure out on my own. I am new to virtually all things DIY and am trying to begin with something simple. I opted to build a video projector from some old parts and an LCD screen.

    I have most of my components in working order -- screen, fan, case, etc. However, the light bulb required is 82vac 410watts.

    How would someone go about achieving 82vac from a 120v receptacle?

    Thanks in advance for any help.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    I'd look for a transformer with a secondary that put out 80 VAC @ 6 amps. That will give you an output very close to the bulb spec.

    I've taken one apart. They are busy animals inside.
     
  3. wireaddict

    Senior Member

    Nov 1, 2006
    133
    0
    Howdy, If you can't find a transformer with a secondary voltage that low you can use a variac [adjustable autotransformer]. You can set it for 82 V; just make sure you get at least a 6.25 A or larger unit to keep it from overheating. Try to get a used one to save money.
     
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