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Thread: 12v into 9v - what will happen?

  1. #1
    Join Date: Jun 2014

    Location: Chorley Lancs

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    I'm Steve.

    Default 12v into 9v - what will happen?

    Hi all,

    I have an SMSL dac which I'm wanting to put in the AOS swap shop, but I seem to have lost the adaptor plug for it. All I can find is one that outputs 12v, while the dac wants 9v. Can this be used, or will it bugger up the SMSL?
    I just dropped in, to see what condition my condition was in

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  2. #2
    Join Date: Feb 2010

    Location: Moved to frozen north, beyond Inverness

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    I'm Dave.

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    Quote Originally Posted by Pigmy Pony View Post
    Hi all,

    I have an SMSL dac which I'm wanting to put in the AOS swap shop, but I seem to have lost the adaptor plug for it. All I can find is one that outputs 12v, while the dac wants 9v. Can this be used, or will it bugger up the SMSL?
    Not a good idea, I think.

    You could offer it without the psu.
    Dave

  3. #3
    Join Date: Feb 2013

    Location: W Lothian

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    I'm Grant.

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    Much depends on the voltage reg in the unit but without being sure from data sheet I wouldn't do it
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  4. #4
    Join Date: Oct 2012

    Location: The Black Country

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    I'm Alan.

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    Yes it all depends on whether there are internal regulators, and if so what the maximum they can cope with is.

  5. #5
    Join Date: Sep 2013

    Location: North Island New Zealand

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    I'm Chris.

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    Also that it is assumed 9v DC is being discussed, when it could be 9v AC , 9V AC once full wave rectified being 12.7v DC

    and if 9VDC that some naughty plugpack manufacturers swap the polarity at the end connector. The most common type is
    the middle connector being positive, which is to say some are and might be the other way.

    If its AC initially, most common regulators will handle the once rectified 4.2v DC difference. For instance a LM317
    rated to 40v input to output differential, a 78xx ( horrible regulators) rated to 35v DC, but exceptions are low dropout LDO types where
    typically 20v DC is the maximum - some 24V Dc though. The effect of more initial voltage, adds heat to be dissipated, which may
    or may not be allowed for in the design.

    Hence as most are saying, supply with the exact adapter.
    Last edited by Light Dependant Resistor; 09-04-2019 at 19:46.

  6. #6
    Join Date: Jun 2014

    Location: Chorley Lancs

    Posts: 14,587
    I'm Steve.

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    Thanks everyone, I suspected it wouldn't be a good idea, but didn't know why. I'll put it in AOS swapshop sans adaptor and see if anyone wants it.
    I just dropped in, to see what condition my condition was in

    T/T: Inspire Monarch, X200 tonearm, Ortofon Quintet Blue. Phono: Project Tube Box CD: Marantz CD6006 (UK Edition); Amp: Musical Fidelity A5 Integrated.
    Speakers: Zu Omen Def, REL T9i subwoofer. Cables: Atlas Equator interconnects, Atlas Hyper 3.0 speaker cables

    T'other system:
    Echo Dot, Amptastic Mini One,Arcam A75 integrated, Celestion 5's, BK XLS-200 DF

    A/V:
    LG 55" OLED, Panasonic Blu Ray, Sony a/v amp, MA Radius speakers, REL Storm sub

    Forget the past, it's gone. And don't worry about the future, it doesn't exist. There is only NOW.

    KICKSTARTER: ENABLING SCAMMERS SINCE 2009

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