laptop ACadapter barrel plug polarity simbol?

[Tim Wescott]

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?

That just means it's DC; if there's any polarity markings they'll be
seperate.

 

[Orc General]

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?

 

[Richard H.]

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?

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

 

[Pooh Bear]

Neither. IIRC it means the input needs to be *regulated* DC power (not
a wall wart).

Hey - some wall warts *are* regulated DC.

Did you mean 'it isn't AC' ?

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.

< picks up ADSL modem > Only if the manufacturer can be bothered ! There's
nothing on the back at all.

Graham

 

[Richard H.]

Hey - some wall warts *are* regulated DC.

Did you mean 'it isn't AC' ?

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