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

  1. #1
    Join Date: Jun 2014

    Location: Chorley Lancs

    Posts: 4,142
    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?
    Excuse me, are you the Judean People's Front?

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  2. #2
    Join Date: Feb 2010

    Location: London, UK

    Posts: 1,307
    I'm Dave.

    Default

    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

    Posts: 56,873
    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
    Regards,
    Grant .... ؠ

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  4. #4
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 4,947
    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

    Posts: 1,337
    I'm Chris.

    Default

    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: 4,142
    I'm Steve.

    Default

    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.
    Excuse me, are you the Judean People's Front?

    T/T: Inspire Monarch, X200 tonearm, Ortofon 2M Black. Phono: Yaqin MS-22B CD: Densen Beat B400 Plus; Headphone/pre: Myryad Z40; Amp: Audion Silver Night 300b stereo
    Speakers: Zu Omen Def. Atlas Equator interconnects, Atlas Hyper 3.0 speaker cables

    T'other system:
    Echo Dot, Amptastic Mini-1, Celestion 5's, BK XLS-200 DF

    A/V:
    Panasonic 42" plasma, Panasonic Blu Ray, Sony a/v amp, MA Radius speakers, REL Storm sub

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