Chris Norton on 23 Oct 2015 13:20:08 -0700

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Re: [PLUG] OT: wall warts

It's not the moving parts that is the issue, it's the capacitors in them. If those go bad, then you aren't going to see any real juice come out. You should check the output on each and see if it's actually pushing out 12v and also what amperage it's rated for.

Crack those bad boys open and look for swelling/busted caps.

On Fri, Oct 23, 2015 at 3:27 PM, JP Vossen <> wrote:
OT, but I know some folks on the list know a lot more about electronics
than I do.

I was having a problem with a cordless wet/dry vac not charging, which
turned out to be a bad wall wart.  I didn't think those went bad much,
so it took me a while to figure that out.  I have a drawer full of old
ones, so I pulled that out and started testing with my digital Fluke 73
and at least half of old ones showed a flickering more-or-less nothing.
 Others seemed to be around the nominal expected output

I just double checked 2 of them with an even older analog multi-meter
with the same results.

Am I missing something or doing something stupid?  Is there some way one
would only output under a real load?  Some reason my tester would work
on some but not others?  Or do wall warts just go bad more than I think?
 I know they are cheap but the have no moving parts...

JP Vossen, CISSP            |:::======|
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implemented self, while the overhead incidentally flattens Moore's Law.
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