Re: !2v adaptor question


"Mac" <Mac@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:1144841144.110329.139990@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I have just bought a pair of cordless headphones for which a mains/12v
adaptor is supplied for the transmitter. However, I will be using a 12v
supply anyway (on a boat), so I will cut off the adaptor and connect to
the 12v supply.

My question is: how do I tell which is +ve and which -ve? The plug into
the equipment is a sealed unit. One of the two wires has a white stripe
on it. Which is this? Does it matter?

Thanks

Mac


I think international standards require the "hole" into which you insert the
adaptor plug to be marked.

The mark is a sort of circle, open on one side (this is the outer metal
piece on the plug) with a line to one side. The end of this line should be
marked + or -. In the centre of the open circle is a large dot, again with a
line and polarity mark running to the opposite side to the one on the
circle. This represents the centre "hole" in the plug.


--
Tony Brooks
www.TB-Training.co.uk


.

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