On 11/17/14, 10:49 AM, Bill Turner wrote:
------------ ORIGINAL MESSAGE ------------(may be snipped)
On Mon, 17 Nov 2014 10:10:13 -0800, you wrote:
Powerless are optimized for intermittent, field operation of dc equipment. Once
installed correctly, you cannot plug something in wrong polarity, even if
fumbling around in the dark. I now buy ONLY 12v supply equipment, and I
immediately cut the power cords and install PPs. That way I can power/charge
every single piece of gear from a common power source ranging from car battery
to wall wart to bench PS.
Using them in the shack for permanently installed gear is somewhat of a waste,
but very convenient.
Tom
kf7rsf
REPLY:
Couldn't you do the same with the spade type male and female
connectors that have been around for decades at a fraction of the
cost?
Use the male for the negative source and female for the positive
source and you can't plug them in wrong either. Insulated, of course.
If your time is free, and you don't mind carrying tools around, sure.
You could also solder the wires to the lugs and not have to worry about
dropping the screw.
It's kind of like the AC receptacles in your house. You could use screw
lugs and your appliances could have spade or ring lugs, but that would
make vacuuming the house a bit inconvenient.
If you want something better than a terminal strip, but not a plug/jack,
the new style terminal strips with a captive screw that clamp onto the
end of the stripped wire are MUCH better than old style barrier strips
and ring lugs.
I like power poles because they are polarized (unlike, say, dual banana
plugs, of which we have dozens in the lab at work).. Yes, with dual
bananas, you can put a reverse biased diode across the terminals so that
if you plug it into the power supply backwards, you don't blow up the
circuit, but still, having a polarized plug is nice.
For low current circuits, modular jacks are nice, as long as you don't
have a lot of mate/demate cycles, and as long as you need 8 or fewer
conductors.
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