Re: Amusing problem about DC polarity
- From: Robert Baer <robertbaer@xxxxxxxxxxxxx>
- Date: Mon, 12 Jun 2006 02:13:43 GMT
siliconmike wrote:
siliconmike wrote:I had a currency counter that would test open...until you put a coin in for sort / count.
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?
The black box, say is a portable electronic consumer device - say for
example a mobile phone or a CD player or a currency counter for that
matter.. Working on less than 24 V for example..
Apologies, I should have mentioned that earlier..
Mike.
And it did not care about polarity..
.
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