home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: misc.consumers
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!sdd.hp.com!hp-cv!hp-pcd!hpcvaac!billn
- From: billn@hpcvaac.cv.hp.com (bill nelson)
- Subject: Re: Tell me about electric blankets
- Message-ID: <1992Dec27.075120.19624@hpcvaac.cv.hp.com>
- Organization: Hewlett-Packard Company, Corvallis, Oregon USA
- References: <1992Dec26.061022.18326@doug.cae.wisc.edu>
- Distribution: na
- Date: Sun, 27 Dec 1992 07:51:20 GMT
- Lines: 31
-
- kolstad@cae.wisc.edu (Joel Kolstad) writes:
- : In article <1992Dec26.092731.3215@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes:
- :
- : >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?
-
- That was not specified. In other threads on this subject, people have sworn
- that rectifying the power to dc would change it to a "non-hazardous" form.
- Now, if you want to talk about ripple free DC, then specify that is what you
- are talking about. Otherwise, I have to assume that any type of dc is valid.
-
- Actually, the dc in your computer does pulsate - although not very much,
- unless you are running it near the limit of its power handling capabilities.
-
- : Likewise, a "DC electric blanket" would not pulsate. (Or at least not more
- : than a miniscule amount.)
-
- It would depend on the design of the blanket. I certainly would not want to
- sleep under a blanket with a large capacitor hooked to it. If course, the
- current requirements might be small enough that you could use a voltage
- regulator instead.
-
- Bill
-