Power supply question (Bogen)

Discussion in 'Darkroom Developing and Printing' started by Adam Montoya, Jul 27, 2004.

  1. Adam Montoya

    Adam Montoya Guest

    Hello,

    I recently purchased a Bogen 22A Special (I'm still trying to figure
    out whats so special about it ) which came with a Dichro head. It did
    not come with a power supply. So I'm wondering if anyone knows where
    i can acquire a PS that will power the 12v 100w EFP lamp (as well as a
    voltage stabilizer)? I realize I will probably spend more on the
    power supply than if I had purchased a different enlarger with
    everything included, but I am stubborn and don't want this enlarger to
    become a waste of space (being that i do have both the 6x6 & 35mm
    carriers). I am also open for plans for building my own.

    Thanks,

    Adam Montoya
    k31 underscore owner at mL1 dot net
     
    Adam Montoya, Jul 27, 2004
    #1
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  2. I bought a switching supply for my V35 and its 12V/75W halogen bulb.
    These supplies may have several protection schemes that are not suitable to
    power a bulb due to the high inrush current.
    You absolutely need a protection that limits the current to the maximum
    authorized without switching off the supply.
    Use a model that has a power rating larger than required (twice the power of
    the bulb).
    Use thick copper wires between the supply and the bulb as currentis pretty
    large (more than 8A nominal in your case).
    Check your timer as it should handle large currents (around 15-20A) which is
    not so obvious.
    This kind of supply lets you fine tune the output voltage, I did it by
    measuring the voltage directly at the bulb pins.

    More on supplies for enlargers:
    http://www.bonavolta.ch/hobby/en/photo/v35suply.htm

    And the supply integrated in the home-made computer-driven timer (well, it
    does more than that):
    http://www.bonavolta.ch/hobby/en/photo/labsoftV3.htm


    Regards,
     
    Claudio Bonavolta, Jul 27, 2004
    #2
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  3. Adam Montoya

    BertS Guest

    A standard computer power supply will give you 12V @ 12A, minimum. Read the
    label for ratings.

    Bert
     
    BertS, Jul 28, 2004
    #3
  4. Careful here. Most switching/computer power supplies require a minimum load
    on the main 5 volt output before the auxiliary 12 volt output(s) will work.
     
    Nicholas O. Lindan, Jul 28, 2004
    #4
  5. Adam Montoya

    Lloyd Guest



    aug204 from Lloyd Elick,

    What about twelve volt lead acid batteries, such as
    automotive or marine types? No stabilizer necessary. No
    problem delivering high initial current. Used ones can be
    pretty cheap. And you can make enlargements next time the
    power grid for the whole continent goes down. Put a windmill
    on top of the house to recharge...

    regards,
    --le
    ________________________________
    Lloyd Erlick Portraits, Toronto.
    voice: 416-686-0326
    email:
    net: www.heylloyd.com
    ________________________________
     
    Lloyd, Aug 2, 2004
    #5
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