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Regulating voltage through a filament transformer

Discussion in 'Electronic Basics' started by rich brenz, Mar 15, 2005.

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  1. rich brenz

    rich brenz Guest

    I'm trying to build a resistance soldering unit using a filament Xfmr
    with 120V input and 6.5V 20A secondary. Any suggestions as to how I
    should regulate the input voltage so as to have variable
    output?(Without,hopefully, having to purchase a large VARIAC!) The input
    regulator will need to sustain the large current draw with no "'splosions"!
  2. Some low voltage halogen lamps are powered by a transformer - a real
    transformer, not an SMPS - and some dimmers exist to control them. May be
    the best buy. Ordinairy incandescent dimmers won't work for long. Designing
    something to control the primary is not that easy, allthough it can be done
    off course. But maybe someone has a good design.

    You can controll the secondary, but you will loose some voltage and 6.5V is
    not that much.

    petrus bitbyter
  3. mike

    mike Guest

    Input current is about an amp. That's not a very large VARIAC!.

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  4. A couple lamp sockets wired in parallel and that in series with the
    primary should be enough of a current limit, once you select the right
    wattage bulbs to put in them. I think a 40 watt and a 75 watt would
    give 3 useful combinations.
    And you get a nice visual indication that a connection is made. ;-)
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