> in my box of AC adapters, a 9 volt, 600 MA unit that fits into the player I
> have. How do I know whether this is centre positive or negative? When I have
> someone look at it, they can't tell, saying that there is a -, then a circle
> with a dot in it, then a + sign.

If they look closer, they'll see a line from the dot to one sign
and a line from the circle to the other sign.
The dot is the inside of the barrel, referred to as the tip.

> I've already plugged the player in (it's useless anyway), and it
> says "charging battery".

Ladies and gentlemen, we have a winner.
Received on Sat Oct 8 14:55:24 2005