On Wed, 27 Mar 2002 09:01:38 -0800, you wrote:

>Hi,
>
>I'm mystified by the many I.D.s and O.D.s of barrel connectors used by =
wall
>wart power supplies.  Is there any convention regarding any of the =
following?
>
>AC/DC
>Voltage
>Polarity
Nope.=20

About the only standard thing is that they are black (mostly!), and
the white stripe on the cable is usually connected to the centre pin.

Centre is often positive, but not always (I think the reason for this
nonstandardness is that sockets with cutouts cut the outer connection,
and people like to switch positives!).

Sony seem to have sort-of standardised their ones, but then they also
use nonstandard plug sizes, and also sometimes use connectors with
centre pins instead of holes.

The most common sizes are 2.5 and 2.1mm (pin in socket), 1.3mm is also
quite common on walkmen and other small things, but there are many
others - digital cameras always seem to use odd-sized ones.

I'm looking at a universal  brick in a catalogue which comes with
SIXTEEN different plug adapters!=20

Having said, that, there actually IS a standard - EIAJ RC-5320A, based
on  different plug sizes for different voltage classifications, but I
doubt if anything like everyone uses (or has even heard of) it.

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