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Thread: EVGA 450 BT?

  1. #101
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    Quote Originally Posted by jonnyGURU View Post
    I've only seen audio use -5v. Mobo manufacturers tell me -12V is just for serial ports.
    I've seen mobos just use +5V for audio, nothing else, they use coupling caps at their output. A most of the opamps they use can actually work with the 12V supply (gives more output voltage) and they don't use it. xd

    What mobo is it?

    There's has to be a protection in the audio circuit, because if you remove the negative rail from the chip amp it will damage it, big detail considering that PSUs no longer come with -5V.

    Or are they generating their own -5V? That's the most common thing I've seen on soundcards, the max97222 is very popular for this, it's got its integrated inverting chargepump.

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    Quote Originally Posted by Samueru Sama View Post
    What mobo is it?
    Very old school. Like over 10 years ago.

    Once again, you misunderstand my point.

    You said that -12V was taken advantage of by on board audio. I meant to imply that I have NEVER seen on board audio use -12V and have only seen them use -5V... when talking about what rails they may use outside of the norm.

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    Quote Originally Posted by jonnyGURU View Post
    Very old school. Like over 10 years ago.

    Once again, you misunderstand my point.

    You said that -12V was taken advantage of by on board audio. I meant to imply that I have NEVER seen on board audio use -12V and have only seen them use -5V... when talking about what rails they may use outside of the norm.
    ?

    I said that not even audio devices use the -12V.

  4. #104
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    Quote Originally Posted by Samueru Sama View Post

    And really nobody uses that rail anymore. xd Not even audio devices which would take advantage of it use it.
    Quote Originally Posted by Samueru Sama View Post

    I said that not even audio devices use the -12V.
    Ok. Then I misunderstood you. I thought you were saying that on board audio DOES take advantage of the -12V.

  5. #105
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    Alright I have bad news again. xd

    I finally managed to put it together, I couldn't find any SMD transistor so I had to improvise:

    https://i.imgur.com/kJ7nHMg.jpg
    https://i.imgur.com/Myg61Ki.png

    I began testing it, I noticed that since the new diodes are normal silicon diodes the crossload performance is terrible:



    That's the unit with just a 1 Ohm load on the 5V rail, if I lower it to 0.8 Ohm the unit shuts down since the 12V rail starts hitting 13.5V.

    And then as I was testing it, the unit died again. happened once I loaded the 12V rail with a 1 Ohm load, again the secondary is fine and I get 5VSB, however the relay doesn't want to engage any more when I try to turn it on. And the transistor at the primary hasn't die.
    Last edited by Samueru Sama; 05-22-2018 at 09:31 PM.

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