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Thread: What is "coil whine" and what is that goopy stuff all over the inside of my PSU

  1. #41
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    Quote Originally Posted by ashiekh View Post
    What are relays used for in power supplies? all mine are old and have none.
    In rush current bypass and to switch +5VSB to +5V in some models.

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    ashiekh (06-19-2019)

  3. #42
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    Quote Originally Posted by Jon Gerow View Post
    In rush current bypass and to switch +5VSB to +5V in some models.
    The first I had forgotten, the second is new (to me).

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    Though 5VSB Bypass is done more often with MOSFETs instead of electro mechanical switches.

  5. #44
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    Quote Originally Posted by Stefan Payne View Post
    Though 5VSB Bypass is done more often with MOSFETs instead of electro mechanical switches.

    No concern about the voltage drop?

  6. #45
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    Quote Originally Posted by ashiekh View Post
    No concern about the voltage drop?
    Yes, if cheaply implemented. Which is why it tends to be a more expensive option.

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