Re: Amusing problem about DC polarity
- From: "Jason S" <jst3712@xxxxxxxxxxxxxx>
- Date: Fri, 9 Jun 2006 22:36:38 +1000
"siliconmike" <siliconmike@xxxxxxxxx> wrote in message
news:1149838180.937755.216870@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Imagine a black plastic box that takes in DC power but has no polarity
markings on its power socket.
The problem is to experimentally determine the correct DC polarity
without opening the box and without letting the box die.
How close can we come?
Based on experience - assuming it's a standard chassis DC Socket, *usually*
(like 90% of the time) the inner/centre is positive, and the outer is
negative.
No guarantees of course. Bit silly of them not to mark the casing!
There may be a way of testing it properly somehow without opening it (or
breaking it), but sorry, I can't help with that one.
Jason.
.
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