Variable Transformer

Discussion in 'The Projects Forum' started by Jonnap2000, Oct 22, 2009.

  1. Jonnap2000

    Thread Starter New Member

    Oct 7, 2009
    7
    0
    Hi,

    Can anyone tell me the advantages and dissadvantages of the variable transformer?
     
  2. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
    1,758
    98
    Advantage it's variable
    Disadvantage cost
     
  3. alim

    Senior Member

    Dec 27, 2005
    113
    1
    As for a serviceman the variable transformer is a useful piece of equipment , used for troubleshooting, that is you can apply a lower voltage to check amplifiers TVs etc . I dont know you use a variable trans. where a fixed voltage is required.
     
  4. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    Disadvantage: variable transformers are usually autotransformers and the secondary is not isolated from the power line.

    Ken
     
  5. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    Another deadly consequence of the auto transformer is the swapped (wrong) connection of LIVE and NEUTRAL connection to the primary.

    The auto transformer works as usual and a lamp dims down as expected to zero when user turned down the auto-transformer, not knowing now both the connection wires to the lamp are at LIVE level.

    This false sense of "lack of voltage" had killed many. Take great care.
     
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