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when i run out of red and black wire for projects i help myself remember which is positve by putting a little piece of electrical tape around the ...
3 ways to find positive and negative on your Ledby mde santis1
positive and negative wiresby mde santis1
mini powered fanby mde santis1
battery clips and how much they helpby mde santis1
testing batterys without expesive equipmentby mde santis1
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