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DC polarity wiring for Dell connector

Forum Laptops & Notebooks : General Laptops & Notebooks - DC polarity wiring for Dell connector

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Hi
I have to build a DC-DC converter to power a Dell D800. The Dell leads I have been given (7m/m diameter 3 wire plug) have black and white wires and signal Which is the correct polarity? is the outer shell negative?

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If you would have posted this just a few hours ago I could have pulled one out and told you, but I moved back to school...

Reply to frozenlead
Tom's Hardware > Forum > Laptops & Notebooks > General Laptops & Notebooks > DC polarity wiring for Dell connector
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