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Transformer replacement

Discussion in 'Electronic Basics' started by Jack// ani, May 23, 2005.

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  1. Jack// ani

    Jack// ani Guest

    Can I use 12V, 2amp centre tapped transformer in place of a 24V/2amp. I
    will not use the tapped wire, so I'll get 24volts across its two
    ends.

    TIA
     
  2. Chris

    Chris Guest

    Nope. The center tap provides a voltage tap halfway between the two
    legs, like this (view in fixed font or Notepad):
    ` 12VCT Secondary Transformer
    ` o-----. ,--------o12VAC
    ` )|(
    `Primary )|(
    ` ) ,--------o 6VAC
    ` 120VAC )|(
    ` )|(
    ` o-----' '--------o 0VAC
    `
    created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de

    Can't get there (24VAC) from here (12VAC). Whether you use the center
    tap or not, you've only got 12VAC. Sorry.

    Good luck
    Chris
     
  3. You cannot use a 24 Watt transformer in place of a 48 Watt transformer,
    unless you know it will not have to deliver more than 24 Watt.
    Many transformers are made in a way which makes it possible to split
    the winding.
    Look at the middle contact point in the secondary winding above, the
    point marked 6VAC, look at the same point on the realworld transformer.
    It is often a sling of copper wire coming out of the winding, and is
    soldered to a post.

    Desolder it from the post, cut the sling in the middle, connect the two
    wires to two separate contacts.

    Now you have separated the two 6 Volt windings. The wire is covered
    with enamel, so they are isolated from each other even if it may not
    look right. Test with a resistance meter that there is no contact
    between the two.
     
  4. The "advertised" secondary voltage of a transformer is normally the
    full voltage developed across its secondary, ignoring any taps, so you
    will only get 12 volts from the 12 volt transformer.
     
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