Except on many pieces of kit where the outside is positive....

Most personal stereos that I've seen use these connectors, either 1.3mm
or 2.1mm with the outside positive.

Most RF type things, which have them tend to have the outside negative.

Many adaptors are AC too.

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@mitvma.mit.edu] On Behalf Of Sid Weaver
> Sent: 27 March 2002 17:29
> To: PICLIST@mitvma.mit.edu
> Subject: Re: [EE]: Barrel Connectors: what's with them?
>
>
> For Colin
>
> Barrel Jacks come in two main sizes, 2.5mm and 2.1 mn-m.
> Nearly all ordinary wall adapters are 2.1mm.  The outside of
> the sleeve is negative, the inside positive.
>
> Sid
>
> --
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