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Thread: Sproggy is ALIVE

  1. #11
    Maximum Bitrate
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    Are you using it with a EPIA motherboard?

  2. #12
    Constant Bitrate henkbliek's Avatar
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    Originally posted by digitallexus
    I used a 7805A which I believe can supply 1A
    Yes it can, but be sure to heatsink it, otherwise it will get about 300 to 400 degrees (C) -which it can't-

    white bream
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  3. #13
    Constant Bitrate
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    I have a modified sproggy 2.7.

    It has dual 787's and dual 788's to get 10A on both 5 and 3.3 volt rails.

    I also added the soft-power-on and standby which the 2.7 lacked.

    I am attempting to make it work with the M9000. I should have plenty of power available now to counter the "sproggy doesn't provide enough current for the m9000 startup spike" theory.

    So far, no luck getting it to work though.

    I've tried adding additional 5v pullup on the PS_ON line, extending the power_good delay, etc.

    It works perfectly with my full blown P3-933 system, just not M9000.

  4. #14
    Maximum Bitrate
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    Ok, I am home from work now and I have added a LM1084 5 volt 5 amp regulator into the mix and now get all appropriate ATX signals... When I get back from the gym, I am gonna add my heatsinks, wire it up and cross my fingers that it will turn on my epia m board!!!

    Mike

  5. #15
    Constant Bitrate
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    I measured the current requirements of 5vstb line with the M9000 (I am using 512MB of PC2700).

    Peak usage is only 295mA during standby. Otherwise I believe it was only around 150mA during power on.

    Which M board do you have?

  6. #16
    Maximum Bitrate
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    I also have the m 9000... I am about to wire it up and give it the inital test drive (fingers crossed)..

  7. #17
    Constant Bitrate
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    I just tested a M10000 and it has the same exact problem as the M9000. Fan on, no POST.

    The board is labeled Rev. B, but looks pretty much identical other than a large additional heatsink.

  8. #18
    Maximum Bitrate
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    Hmmmm..... doesnt work. I dont even get the fan spinning.

    I had to dust off the trusty o'scope to see whats really going on with the power OK line as I think that is what is the problem..

    For one thing, the board that works (one I bought with the small case) puts out VERY precise outputs (usually only a couple mV off) where as the sproggy is not nearly that close...

    The official ATX specs says the power ok line must come up between 100 and 500 mS after the PS On line goes low. I was watching the difference between the board that works and the sproggy.. The sproggy seems to meet the timing but kicks up to 4 volts for a second before it jumps up to 5 volts? The working PS does not do this... I dont know if this is a problem but the specs say this

    3.3.5. Risetime
    The output voltages shall rise from < or = 10% of nominal to within the regulation ranges
    specified in Section 3.2.1 within 0.1 ms to 20 ms (0.1 ms T2 20 ms).
    There must be a smooth and continuous ramp of each DC output voltage from 10% to 90%
    of its final set-point within the regulation band, while loaded as specified in Section 3.2.3.
    The smooth turn-on requires that, during the 10% to 90% portion of the rise time, the slope
    of the turn-on waveform must be positive and have a value of between 0 V/ms and
    [Vout,nominal / 0.1] V/ms. Also, for any 5 ms segment of the 10% to 90% risetime
    waveform, a straight line drawn between the end points of the waveform segment must
    have a slope [Vout,nominal / 20] V/ms.

    So, after watching the Power OK line from the sproggy, it definately does NOT create a nice strait ramp to 90% of 5 volts...

    I am gonna try to get my hands on a multiple channel waveform recorder from work so we can actually watch the timing differences between the important lines...

    Mike

  9. #19
    Constant Bitrate
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    Isn't the rise time definition talking about the various voltage rails?

    Shouldn't the power_good line act as a TTL on/off level and go from 0 to ~5 when power is good?

  10. #20
    Constant Bitrate
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    Strangely enough, I don't think the M9000 actually needs the power_good line. During my current measurements with a desktop ATX supply, I tested with this line disconnected at one point and it POSTed fine.

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