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Something wrong, help need! : making -8V and 5V PS,

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  • Something wrong, help need! : making -8V and 5V PS,

    Something wrong, help need! : making -8V and 5V PS,


    Hello guys..
    i am now making this 12VDC input, 5V and -8V output PS. (only building power suply, not

    controller)




    but, mine doesn't produce -8V.
    but it produce -1V.. please, check this and tell me weather i got wrong components or wrong

    size..


    here is what i got and what it says on the surface. Mostly i got from www.jameco.com and including their part number and link

    No. Fron schematic Actual component shows(on face shows) Part No.
    1. 555 timer IC, XRL555 (L555CP 9309) 34930
    2. 7805 5V reg IC, 7805T (L7805CV) 51262
    3. 220 uF cap CAP, Radial, 220uf 25V, 105C 158262
    4. 1K resistor Resistor, 1/4W 5%, 1.0K Ohm
    29663
    5. 3.3K resistor Resistor, 1/4W 5%, 3.3K Ohm
    30672
    6. Diode 1N4002 Diode, Sil Rec, 1N4002, 1A, 76961


    And, following are from local electronic shop.
    7. 7908 -8 Reg (7908 UC8352)
    8. 0.047 uF cap (A E 473)

    Let's assume that i wired all correctly.. (that's why it produce -1V rirhg?)

    here is some clue that i don't know.

    1. for diod, it looks like this, ====||
    and i matchiwired them as this,
    ==||
    |>|
    ▶|
    let me know whether i did opposite way or not

    2. Every compnent seems correct but 0.047uf Cap seems wrong or, maybe right..
    If it says A E 473, then is that right?
    also, schematic shows |( <----- like that, but it seems there is no + or - on it..

    3. Probably my timer is wrong???


    Guys!!!
    Please check the this and advise me why i am getting -1V not -8V..

    thank you
    Started
    <A HREF="http://www.mp3car.com/usersites/zp3/" TARGET=_blank>
    http://www.mp3car.com/usersites/zp3/</A>

  • #2
    Moved to "Power Supplies".
    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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