[Noisebridge-discuss] Why is my AC adapter melting?

Ari Lacenski alacenski at gmail.com
Thu Apr 18 02:52:24 UTC 2013

I was intrigued, so I googled it and found pages and pages of people
complaining about melting power bricks, but not the technical reason.
I too would like to know. (egad! glad yer all right!)

Inside they're pretty simple: a pair of wire coils and some diodes for
the DC current. I would imagine that one of the diodes failed and
caused a short, leaving the transformer coils to turn into toaster
elements. Confirm/deny?


On Wed, Apr 17, 2013 at 6:00 PM, James Sundquist
<sundquistjames at gmail.com> wrote:
> I have a 9v 300ma power supply connected to an appropriate 9v 300ma device,
> which has been happily working for the past year.  I hadn't used it in a few
> weeks and plugged it into an outlet and found myself getting no power.
> Confused, but easily sidetracked, I worked on something else for a half
> hour.  I came back to the device and decided to unplug it; I found the AC
> plug had actually grown quite soft/extremely hot to the touch.  I've now
> tossed it in the electrical recycling bin and am just wondering if these
> kinds of electrical meltdowns are common over time.
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