On Tue, 07 Dec 2004 20:20:29 GMT, Rich Grise <rich@example.net> wrote:
Quote:
On Fri, 03 Dec 2004 22:42:23 +0100, Rudolf Zeitschek wrote:
Don Kelly schrieb:
"Eric R Snow" <etpm@whidbey.com> wrote in message
I envision a full wave rectifier and a capacitor. And it looks like
there is enough room in the control for these extra parts. Is there
anything inside the blanket itself that precludes Dc operation?
Thanks,
Eric R Snow,
--------
It could be done but I wouldnt recommend it. The thermostat switch would
likely fail quickly and start a fire as it is much harder to interrupt DC.
What you would be doing is trading an insignificant (if present) hazard for
a much greater one. Much safer to leave it alone.
I agree and would like to mention a further problem:
If you just rectify (without filtering by a condenser) you get the same
heat, but you still have a lot of alternating current (and field).
If you filter to get pure DC, you need a very large condenser and ir
will give the peak voltage (165v for 117V AC) and the blanket will
overheat.....
I'd be worried about any modification to an electric blanket. How does the
thermostat actually sense the temperature of the blanket? Isn't the
resistance of the element itself the sensor? If so, then any messing with
it will upset its operation.
I agree with that other poster - leave the AC, because a DC magnetic field
will cause your blood to pool. ;-) Tell the wife you did some research and
found out that AC is actually beneficial! We're engineers, we ought to
know!
Good Luck!
Rich
Perfect answer Rich! I'll just say that the engineers on line have
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conducted a study and found that ac is actually good for you as it
keeps the blood evenly distributed.
Eric