Voltage question

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

  1. rpw

    Thread Starter New Member

    Jan 11, 2007
    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

    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
    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.