stepping down 300v ac

Discussion in 'The Projects Forum' started by asad1234, Apr 10, 2013.

  1. asad1234

    Thread Starter New Member

    Apr 10, 2013
    I want to stepdown 300Vac 50hz to 5v(peak)ac but i have only 220v to 12vrms transformer available can someone suggest how can i use this 220v transformer with 300v. I tried using a potential divider to first divide the voltage but it doesn't works since the primary winding of transformer comes in parallel with the resistance of potential divider circuit and mess up the voltage drop any suggestions??
  2. wayneh


    Sep 9, 2010
    Well that is a predicament. So getting the right transformer is not an option? You could consider winding your own.

    How much current do you need at 5VAC, and what do you hope to power with that? Your available solutions will depend a lot on how much current you're dealing with.
  3. richard.cs


    Mar 3, 2012
    If you had two identical 220V-12V transformers then you could connect the secondaries in parallel and the primaries in series to give 440V-12V, about 8V out for 300V in.

    Alternatively a lot of European suppliers stock transformers with 400V or 415V primaries, they are intended to power electronics in three-phase equipment that doesn't have a neutral connection. One of these with a suitable secondary would do what you want.

    Is your 300V peak or rms? How much current do you need?
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    buy the right transformer...
    #12 likes this.