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12 Volts 3 Amps DC vs 12 Volts 6 Amps DC

Discussion in 'Electronic Basics' started by Jerome Jahnke, Sep 27, 2004.

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  1. I am working on a project. And I have two elements which take power
    from two different AC to DC power converters. In this case it is an
    LCD Display and a DC to DC power converter for a small computer. The
    display is expecting 12v 3A and the DC to DC converter is expecting
    12v 6A.

    I have been looking around I understand that the product of volts and
    amps make wattage, which make sense on the computer side as wattage is
    what we need to make all the perphial devices go. But I am confused on
    a few things.

    1) If I just split the connector from the AC to DC converter how would
    that affect the DC to DC converter (would it still actually be getting
    12v 6A?)

    2) If I split it and put some kind of (as yet unknown circut) in front
    of the LDC Monitor to somehow convert it to 12v3A would that affect
    the DC to DC converter.

    3) Finally if I split it and did not convert it would the 12v 6A
    damage the LCD?

    I don't know enough about electronics to phrase the question which is
    why I am having a problem finding the answer (the search engines don't
    seem to be helping.) Ideally I would like this device to run on both
    wall power with the AC to DC converter as well as off of a car's 14
    volt electrical system.

    Any adivce here would be very helpufl.

  2. On 26 Sep 2004 21:40:30 -0700, (Jerome Jahnke)

    I'm very newbie at this, but this sounds similar to what I've done
    before so here's my shot at it. Veterans please correct me so that I
    can see if I learnt anything after all these time :ppPp
    I think you only need to worry about the volts. The devices will
    determine how many amperes they draw, just make sure your supply can
    handle the total power needed.
    I once did something like this, clobbered together an adapter for my
    LCD after I misplaced the original AC->DC converter. Essentially I
    took a normal wallplugged AC to 24V DC adapter and added a simple 12V
    regulated circuit using a MOSFET and some caps. The design was
    according to the diagram provided by the power regulation mosfet
    manufacturer. It worked pretty ok except I think I needed to use
    bigger caps or the circuit sometimes doesn't provide enough power
    during mode switch. Though I got around it simply by switching on the
    LCD after the system booted :ppPpp It's something you might want to
    keep in mind if the screen goes blank after a mode switch from say
    text 320x240 to 800x600.

    For your case, I think you would just have to make the two bits
    detachable so you can plug in either the AC/DC converter or the car's
    14 (isn't it 24V?) system.

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