Change 12VDC to 12VAC, can it be done without transformer?

Discussion in 'General Electronics Chat' started by mosta, Jun 27, 2014.

  1. mosta

    Thread Starter New Member

    Jun 27, 2014
    I've 3 batteries ( each 3kw X3= 9kw ) and Inverter for 9kw is too expensive, I just want same voltage input but to be changed to the VAC (12VAC) , so it can be done without transformer? So, in this diagram: Can I just remove the transformer and put powerful transistors to withstand 9kw input VDC?
    It can be done and how can I edit the diagram without transformer?
  2. Papabravo


    Feb 24, 2006
    No it cannot be done. The multivibrator circuit produces a square wave that swings between +12V and ground. The whole purpose of the transformer is to produce an AC waveform that is not referenced to battery ground. There is going to be some smoothing of the waveform but it probably won't be a sinewave. Also 12VAC is an RMS value so the transformer needs to boost the peak voltage so the resultant waveform is 12VAC (RMS), or 17V Peak or 34 V P-P

    There are no component values so it is hard to tell what frequency AC output you need.

    Of course you can do anything your heart desires. Accomplishing a specific purpose is another matter entirely.
    Last edited: Jun 27, 2014
  3. inwo

    Well-Known Member

    Nov 7, 2013
    What is the 9KW 12vac load?:eek: