home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: misc.consumers
- Path: sparky!uunet!think.com!spool.mu.edu!uwm.edu!zazen!doug.cae.wisc.edu!kolstad
- From: kolstad@cae.wisc.edu (Joel Kolstad)
- Subject: Re: Tell me about electric blankets
- Organization: U of Wisconsin-Madison College of Engineering
- Distribution: na
- Date: 26 Dec 92 06:10:22 CST
- Message-ID: <1992Dec26.061022.18326@doug.cae.wisc.edu>
- References: <1gt74rINNsse@hp-col.col.hp.com> <1992Dec26.092731.3215@hpcvaac.cv.hp.com>
- Lines: 36
-
- In article <1992Dec26.092731.3215@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes:
- >cab@col.hp.com (Chris Best) writes:
- >: > : Your DC blanket will, of course, generate a magnetic field -- just not an
- >: > : electric one. Whether or not this is better or worse from the health
- >: > : standpoint is, as you point out, a good question.
- >: >
- >: > Bullshit. It will produce a DC electromagnet field. That field will build
- >: > and collapse as the blanket thermostat cycles.
- >:
- >: Maybe a few hundred times a night, but not 1.7 million, which was the original
- >: point. Is there ANYthing on your body that resonates at the thermostat's
- >: cycle rate? Not likely.
- >
- >Ah, but it would - unless the person built a power supply with built in
- >capacitors and a voltage regulator. I suspect that such a contrivance
- >would be rather hazardous.
-
- Perhaps if you used 177V DC right off the AC line, although I've heard that
- 120V 60Hz AC is actually worse. :-) But perhaps... if so, transformers
- could always be used to step down the voltage. Granted, this is
- expensive.
-
- >If the person simply rectified the current then - with a half-wave rectifier,
- >the current would pulse at 60 hz (1/2 that of a 60 hz AC voltage, which
- >pulses at 120 hz) or - with a full-wave rectifier, the current would pulse
- >at 120 hz.
- >
- >It is questionable that anything in the human body resonates at either 60 Hz
- >or 120 Hz either.
-
- Bill, Bill, Bill... DC DC DC! Not pulsating DC, ok? When you go buy a "DC
- power supply" for your computer, it doesn't pulsate, now does it?
- Likewise, a "DC electric blanket" would not pulsate. (Or at least not more
- than a miniscule amount.)
-
- ---Joel Kolstad
-