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dx 100mw labby question

Razako

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Find an ordinary LED. The longer leg should be negative. Hook the adapter up to the LED with a resister. If the LED turns on you just found the polarity of the wires.
 





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If the output is 2 black wires bonded side by side they usually mark the positive side with a ridge along the side......

Regards rog8811
 

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also, when the wires are bonded side by side, the negative will have white dashed running on the wire.
 

Razako

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If you post a picture of the adapter in question I can probably tell you which wire is which.
 




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