Monday, 25 September 2017

connector - How to tell polarity expected of a DC barrel jack?



I'm sure this information is somewhere around the internet, but I can't find it.


I have a device that takes a DC barrel jack. I don't know the polarity it expects though. There is a marking though. It looks like this:


___
---  12VDC

I'm 99% sure it's a symbol to indicate the polarity, but which is it? Positive inside or positive outside?




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