designing a step up transformer (1V-4V)

Discussion in 'The Projects Forum' started by IvyK, Apr 7, 2012.

  1. IvyK

    Thread Starter New Member

    Apr 7, 2012
    Hi all,

    I need to step up 1V ac to 4V ac. Is it practical to do this with a transformer. I need the design to be small and efficient.

  2. rfredel


    Jan 23, 2011

    you can use an line input audio transformer with transformation ratio of 1 to 4. This is the easiest solution.



    PS: Sorry, if my English is not so good

  3. IvyK

    Thread Starter New Member

    Apr 7, 2012
    Ok thanks. I've read up on them but i found some really complicated information. I'll try and search for more information. Are there any power issues with an audio transformer? By power issues, I mean can it transfer a decent amount of power?

    PS: Dont worry about the English, No ones perfect:)
  4. jimkeith

    Well-Known Member

    Oct 26, 2011
    English is fine--Good suggestion
    Check out this audio transformer available from DigiKey:
    This page provides a link to the datasheet

    This is a 600Ω to 600Ω transformer with a split secondary--now forget the impedances as this only adds to the confusion

    Turns ration = 2:1:1

    So if you wire it as an autotransformer with all windings in series (series aiding) and input your 1V source to one of the secondaries, you have a 1:4 transformer--if you need isolation, you are limited to a 1:3 ratio

    Although it indicates a frequency range of 300 to 3500hZ, I believe it will work OK at power frequency.

    Regarding power, it indicates a DC current rating of 90mA--what this means is that it can handle serious DC without saturation--also means that low freq should be OK as well--regulation is unknown as they do not indicate winding resistances