On 2/9/10 10:25 AM, Doug McNutt wrote:
And while I'm at it there are too many of those cylindrical connectors in the world. The plus and minus leads are often not specified and you may not know if a device needs positive on the center or the outside. There is also a pair, 3.2 mm comes to mind, where there are two different designs that have different diameters for the inside pin. If you have the wrong one it can seem to fit but the pin carefully fails to contact the inside sleeve of the mate. It's a good thing I don't have much hair on top or I would have pulled it all out the last time I got hit by that one.
Most equipment is marked for polarity. Watch out for stuff that isn't, it may be AC which doesn't usually mix well with DC.
Usually coax power connectors that fit will make electrical contact too. If the inside pin is too big the plug won't go in. If it's too small it still can go in and it will usually make contact. I don't recall ever running into one that didn't come to think of it.
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