How to Power an AC device using DC- from an outlet

I have a heating pad (Sunbeam, the kind of pad used for muscle aches etc.) that plugs into the wall (110v AC). It says on the pad that it draws 42watts. For various reasons, I'd like to have the heat generated by a DC source rather than AC.

I'm thinking maybe there is a way for me to plug some kind of converter into the wall (AC to DC) and then plug the heating pad into this which will still result in heat. I have no idea if this is possible. The pad has a switch for three different heat settings.

Can I do this? How?

Thanks for any suggestions!

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gopy971 year ago

i want to operate ac device with dc voltage? is it possible? if yes how can i make?

what device

heat: easy. Yes.

Light bulb: yes.

Motor with brushes: yes.

Induction motor : I don't think so.

Please give no details at all so everyone here leave a few hundred comments with possible options...

Patrik9 years ago
Are you sure it doesn't already include a transformer and AC-DC converter? Most electric equipment that are meant to be in direct human contact (whether it's an electrical blanket or an electrical razor) use low-voltage DC out of safety considerations. Wouldn't want to spill your beer on that heating pad while you're wearing it, right?
Goodhart Patrik9 years ago
Yeah, most of the ones I have seen are not *shiver* isolated with a transformer, and also *double shiver* not protected by a GFCI device. Maybe the newer ones are though...
UpsidedownRightSideup (author)  Patrik9 years ago
No transformer. If you go to your local Walgreen/Rite-Aide you'll find these heating pads. They simply plug into the wall.
no walwart?
The vast majority of Walwarts I'm seeing on Google appear to be made for simple electronic devices, with low (mA) output, nor do any of them have a two pronged socket. I'm thinking I might have to use one with higher Amp output (I found one - at 4Amp) and modify it to accept a two pronged plug (maybe from Radioshack). Your simple two word comment reflects exactly the direction I was thinking, BTW. PKM, what do you think?
. Most heating pads I've seen run on 110VAC (I'll assume 220 in other parts of the world). All the ones I've seen have the elements sealed (sonic welding?) in a heavy plastic bag to keep out moisture. . Not something I'd buy at a garage sale, but reasonably safe if used/maintained properly and thrown out when called for.
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