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    Afefe10's Avatar
    Afefe10 Posts: 5, Reputation: 1
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    #1

    Dec 18, 2013, 02:39 AM
    Transformer polarity
    Lost transformer-ac110/120v,output-DC 9v 400/500ma. No polarity info. Have 3 universal adapters with polarity switches. Is there a way to figure out polarity so I don't fry the multi- action x- mas musical figure?
    Afefe10's Avatar
    Afefe10 Posts: 5, Reputation: 1
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    #2

    Dec 18, 2013, 02:48 AM
    Polarity
    Are all 9V transformers the same polarity?
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #3

    Dec 18, 2013, 04:49 AM
    No.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
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    #4

    Dec 18, 2013, 04:49 AM
    Do you own a multi-meter?
    Afefe10's Avatar
    Afefe10 Posts: 5, Reputation: 1
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    #5

    Dec 18, 2013, 01:44 PM
    Quote Originally Posted by stanfortyman View Post
    Do you own a multi-meter?
    . Yes more then one,but need to relearn how to use. Thanks for your 9 V ans.
    Afefe10's Avatar
    Afefe10 Posts: 5, Reputation: 1
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    #6

    Dec 18, 2013, 02:45 PM
    Quote Originally Posted by stanfortyman View Post
    No.
    Thank you
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #7

    Dec 18, 2013, 02:51 PM
    Most DC adapters have the polarity marked on them. As a rule, but not 100%, the center is positive.
    Afefe10's Avatar
    Afefe10 Posts: 5, Reputation: 1
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    #8

    Dec 18, 2013, 04:58 PM
    Quote Originally Posted by Afefe10 View Post
    Are all 9V transformers the same polarity?
    Thanking Stanfortyman & all others for ans.
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