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

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  • 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
    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...
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

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    • #3
      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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