How do you change poloarity on a PSU?

All my searches keep returning damn PC power supply stuff.

Do I just cut the cord a few inches from where the cord would be inserted into the unit, strip it, and then re-connect the wires to the opposite ones? If I use this method, what is a safe way to keep this thing from starting a fire in the future? I normally unplug my bricks when not in use, but sometimes I forget.

Or do I open it up somehow (don't see any screws), and do my business in there?

It's this PSU...

http://www.amazon.com/Power-Adapter...&redirect=true&ref_=oh_aui_detailpage_o00_s00

greedostick said:

Do I just cut the cord a few inches from where the cord would be inserted into the unit, strip it, and then re-connect the wires to the opposite ones?]

Click to expand...

Yes that's it.

greedostick said:

If I use this method, what is a safe way to keep this thing from starting a fire in the future?

Click to expand...

It's safe as long as you do a clean job and use proper insulation (heat shrink tube and electrical tape).

Or you could buy a replacement male DC barrel connector, cut the old one off, strip the wires and solder them onto the new barrel connector.

greedostick said:

Do I just cut the cord a few inches from where the cord would be inserted into the unit, strip it, and then re-connect the wires to the opposite ones?

Click to expand...

Yes that's pretty much it. I wouldn't cut too close to the brick, leave yourself an ample margin in case you make some mistake.

greedostick said:

If I use this method, what is a safe way to keep this thing from starting a fire in the future?

Click to expand...

Heatshrink tubing. I suggest you buy one of those kits with multiple sizes like this one http://www.amazon.com/Vktech-150pcs-Shrink-Tubing-Sleeving/dp/B00EXLPLTW
It's really handy to have anyway.

Heatshrink each splice (twist together horizontally then solder) separately then heatshrink over both.
Of course remember to put the heatshrink pieces over the wires before you join them

greedostick said:

Or do I open it up somehow (don't see any screws), and do my business in there?

Click to expand...

Nah since you are buying one without screws it's ok to invert the wires externally, with the heatshrink it'll be a neat job anyway.

After the modification mark clearly the new polarity on that psu so you won't risk using it accidentally with some other device with the more common central positive polarity.

thanks guys!