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Thread: How do i make -8V from 12V power?

  1. #1
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    Join Date
    Feb 2001
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    Post How do i make -8V from 12V power?

    How do i make -8V from 12V power?

    Do i just need to use

    -8V regulator(7908) and connect like this?
    Code:
    |---------------|
    |    7908       |
    -----------------
    |      |        |
    |      |        |
    12V    Ground   X
    then will I get -8 from X?

    is that all i have to do it? or do i need other stuff too?

    let me know about this and if you have good web site about this or schematic..


    PS: i am trying to Sharp 6" work so i need 12V(from car) 5V(http://www.hut.fi/Misc/Electronics/circuits/vga2tv/psu_5v.html) and -8V...

    LQ6RA01 from eio.com(and bought from jay) i think.. and have only bare LCD part
    Started
    <A HREF="http://www.mp3car.com/usersites/zp3/" TARGET=_blank>
    http://www.mp3car.com/usersites/zp3/</A>

  2. #2
    Retired Admin Aaron Cake's Avatar
    Join Date
    Jan 2000
    Location
    London, Ontario, Canada
    Posts
    2,464

    Cool

    That won't work. The 79xx series regulators require a negative voltage input. Check out http://www.aaroncake.net/circuits under Voltage Inverter and Voltage Inverter II for some circuits...
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  3. #3
    Low Bitrate
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    Feb 2001
    Location
    Kuutinkylä, FINLAND
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    Post

    I was jus designing almost free DC-DC ps for myself and I found this:
    MAX765
    This will make -12V@ ~500mA from 5V

    It will easily do -8V if you use 7908 after that circuit and 7805 before.
    You need only few parts besides that and they all are easy to get!
    WINAMPCAR
    Project almost ready

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