View Full Version : Transformer polarity
Afefe10
Dec 18, 2013, 02:39 AM
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
Dec 18, 2013, 02:48 AM
Are all 9V transformers the same polarity?
stanfortyman
Dec 18, 2013, 04:49 AM
No.
stanfortyman
Dec 18, 2013, 04:49 AM
Do you own a multi-meter?
Afefe10
Dec 18, 2013, 01:44 PM
Do you own a multi-meter?. Yes more then one,but need to relearn how to use. Thanks for your 9 V ans.
Afefe10
Dec 18, 2013, 02:45 PM
No.
Thank you
ma0641
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
Dec 18, 2013, 04:58 PM
Are all 9V transformers the same polarity?
Thanking Stanfortyman & all others for ans.