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Thread: Can someone simplify this diagram?

  1. #1
    Constant Bitrate GRUNT's Avatar
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    Can someone simplify this diagram?

    My lcd inverter requires 5v the controller card requires 12v.
    I have a 12v DC-DC 12v 5amp out PSU.
    I want to be able to use this PSU to supply the 5v along with the 12v.
    I found this link and have a Maxim 787.
    http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1271

    Can someone simplify this diagram in to English for me.

    I can do the soldering and get the parts, but I don't know how to read this stuff.

    I also have what I think is 2 T7s and need a T6 if anyone would like to trade???
    I need the T6 to complete an other sproggy, which I could use to power
    the LCD and controller???

    Thanks for helping the dummy.

  2. #2
    I'm sorry, and you are....? frodobaggins's Avatar
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    you don't need that switchmode regulator, a simple regulator and a heatsink would suffice
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  3. #3
    Constant Bitrate GRUNT's Avatar
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    Thanks, how do I build that?

  4. #4
    Raw Wave
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    The diagram is already simple, You cant really make it much simplier.

    How much current you want from your 5V supply? If you dont want much then there no need for a switchmode regulator, the good old LM7805CV can give out 2A max. If you want lets say 5A with an input supply of 12V then your 5V regulator have to lose 7V at 5A, thats 35W of power lost as heat.

    So decide what you need first then build it.

  5. #5
    Constant Bitrate GRUNT's Avatar
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    Built it, and it works!

    Thanks for the help.

    "Just be cool. She'll hold."

  6. #6
    Raw Wave
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    That was quick...where did you buy all the parts? any links? I just hate those inductors, not easy to buy them.

    Thanks

  7. #7
    Constant Bitrate GRUNT's Avatar
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    I removed the 7805 from an old PSU.

    This is the LCD screen and invertor I have:

    www.review-displays.co.uk/Products/nec/specs/nl6448bc20-08.htm

    Recommended inverter (Part No. 65PWB31)

    Should have it up and running in the car, by the weekend, I hope!

    Thanks
    John

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