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13vdc to 11vac conversion

Discussion in 'General Electronics' started by [email protected], Aug 9, 2003.

  1. Guest

    I am seeking a way to replace the inverter/wallwart solution I am
    using. I have tried powering the device with the 13vdc, but it does
    not function properly. I believe the satellite tuner inside requires
    29vdc and they are making it from the ac voltage.
    Is a circuit to accomplish this conversion a simple project, or does
    an off the shelf product exist? The current requirement of the ac
    supply is quite low.

    Thanks for any help.
     
  2. Commercially avbailable power invertor to change the 13 VDC source to 110
    VAC to poer the device. Price them and you may just find it more effecient
    to just replace the reciever.
     
  3. Rich Grise

    Rich Grise Guest

    Is this device on a vehicle of some kind? IOW, is 13 VDC all you have?
    It sounds like what you have is the closest to an off-the-shelf item
    as you're going to get. Depending on what the 11VAC drives, it
    could be pretty simple to build just a chopper or something, where
    the equipment's input transformer serves as the chopper's output
    load.

    Lessee ... yeah - an LMC555 and any ol' power MOSFET and a flywheel diode.
    Adjust Ra and Rb for the duty cycle that works the best. Or if the input
    isn't isolated, then you'll need a transformer of some kind, which won't
    need to be very big.

    Good Luck!
    Rich
     
  4. Guest

    The unit is a very simple 950-1450 spectrum analyzer, the DC is coming
    from a 7ah gell cell, it outputs composite video. After reading the
    thread about the game console, I am assuming the video section needs
    the 60hz to properly display now.
    Thanks for the direction.
     
  5. Rich Grise

    Rich Grise Guest

    wrote in message > ...
    I'm sorry, but I'm really having trouble grasping what you're trying
    to accomplish here, and what you're working with.

    Where's the 60 Hz coming from _now_?

    Please draw me a word picture (or ASCII art diagram) of what you
    have now (i.e., how many boxes, their names, what's connected to
    where, what you want different about it, stuff like that. I may
    be deep, but I'm slow. ;-}

    Thanks!
    Rich
     
  6. Guest

    A 110v to 11vac wall plug transformer, powered by a small 100watt DC
    to AC inverter which is powered by a small battery.

    I am trying to eliminate the inverter and wall plug with a direct
    conversion of 13VDC to 11VAC.
    I'm really bad at that, but will do it if the above description isn't
    good enough.

    I have been thinking, if I could modify a small inverter to produce
    the 11volts AC, as opposed to the normal 110 I could probably be
    happy.
    Is this possible?
     
  7. Rich Grise

    Rich Grise Guest

    wrote in message
    But, isn't that what you already have, just in two boxes? Open
    both boxes, and find someplace to hide the wall wart transformer
    inside the inverter box, or put them both in one new box - it'll
    be MUCH easier and cheaper than trying to modify the inverter itself.

    Good Luck!
    Rich
     
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