In sci.electronics.repair, on Thu, 01 Dec 2016 04:02:02 -0600,
At hamfests over the last 4 years, I think it's more than one person who
has been selling a little transparent bag of 7 power plugs, all
different, and I those 7 make up 99% of all the plugs used.
At hamfests one bag was only $2 so I bought 3 on the theory I'd need 3,
all the same size.
But that doesn't mean you'll be able to find this. You very often see
more than one vendor at more than one hamfest in more than one state
selling the same stuff, but how often that happens nationwide, or where
you and I are, I don't know. And a lot of hamfests are so small no one
is selling this.
This is no good because it's $30. FWIW the plugs are longer than my $2
set. :-)
https://www.amazon.com/Generic-Straight-Universal-Connector-Notebook/dp/B00DC1PCJ8
This is $6 plus shipping:
https://www.altex.com/6-Power-Cable-with-Assorted-Coax-Plugs-48-400-P143451.aspx
A more likely bet and something always available online is that there
are also universal power adapters, that have a range of voltages from 3
or 4.5 up to 9 or 12, and they have SEVEN or so power plugs on the end
all attached at once. Make sure you get one with enough power for yoru
speakers because they come in 500ma and 1000mamp iirc. Even the big one
is no more than $10.
I have 3 or 4 universal ones of various ratings and I use them to
figure out the minimum voltage I need to make something work, if it's
not labeled, and to use temporarily until I find or make a one-size
adapter. But sometimes temporarily drags on for years, like for my
router. I used a universal temporarily until I found an exact
replacement on ebay. That worked for a year or two before it burned out
in the same way the first one did. Someone, maybe here, said they were
known to be unreliable. 5 minutes after the second one broke, I was
back to the universal, which was still lying on my desk behind the
monitor.
Make sure the voltage and amperage goes high enough.
$18 for 1300 ma but you can probably do better
https://www.amazon.com/PowerLine-90367-Universal-Power-Adapter/dp/B00CWR39TI
I hate to push walmart but this at least looks like the same thign, $13
https://www.walmart.com/ip/Original-Power-Powerline-1300-mA-Universal-AC-Adapter/16778839
Microcenter has more than one model, not especially cheap.
FINALLY THIS is what I meant $8.35
http://www.ebay.com/itm/AC-DC-Wall-Power-Charger-ADAPTER-Universal-3-4-5-6-7-5-9-12V-Power-supply-2-5A-/301595192644?hash=item4638796d44:g:ROkAAOSwv0tVLb2D
Well I like the ones where they are all wired in at the same time,
including to replace a 9-volt battery, but maybe you don't care.