That just means it's DC; if there's any polarity markings they'll be seperate.
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18 years ago
-- ------------------------------------------- Tim Wescott Wescott Design Services http://www.wescottdesign.com
laptop ACadapter barrel plug polarity simbol?
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- posted
18 years ago
What's the barrel plug symbol means when it has a solid line on top and a dashed right under it? Is that ot say the barrel plug has the inside cylinder as negative and the outside positive? or is it hte other way around?
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18 years ago
Neither. IIRC it means the input needs to be *regulated* DC power (not a wall wart).
Usually there's another indicator like a C with a dot in the middle (i.e., the end of a barrel connector), with one of them showing + or -. That's your polarity marking.
Richard
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18 years ago
Should've said "most" wall warts. Nearly all the wall warts I come across (i.e., consumer goods) aren't regulated, though there are certainly exceptions like the one you mentioned. (IME most regulated supplies tend to be inline bricks for some reason, like laptops.)
Cheers, Richard
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18 years ago
Hey - some wall warts *are* regulated DC.
Did you mean 'it isn't AC' ?
< picks up ADSL modem > Only if the manufacturer can be bothered ! There's nothing on the back at all.Graham