Electric blankets, Gratuitous complexity??
On Sat, 10 Nov 2012 00:28:53 -0500, "tm"
wrote:
wrote in message
.. .
On Fri, 09 Nov 2012 21:30:28 -0600, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:
"tm" fired this volley in news:k7khim$at3$1
:
Well, if it has a poorly designed triac controller, it may radiate RFI.
Even well-designed ones do on the turn-on. Only a lot of down-line
choking and shielding will get it down to reasonable levels.
But it's not likely that the RFI emitted from a 1/2-amp controller would
emit enough to be harmful to tissue. Could screw up your pacemaker, I
guess...
Lloyd
There ARE controllers that switch on the downward slope of the sine,
greatly reducung theRFI.
One thing for sure - an electric blanket sure plays havok with
magnetometers, like in electronic compases - and electronic gyros.
It's best when they switch on the zero crossings.
Which means either full on, half on, or off.
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