Article View: sci.electronics
Article #5932Re: DC motor noise in audio circuit
From: Bob Myers
Date: Thu, 30 Aug 1990 17:47
Date: Thu, 30 Aug 1990 17:47
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>Remember, magnetic fields don't really induce voltages in isolated bits
>of paths. High impedance, low impedance, it doesn't matter. Magnetic fields
>induce voltages in *loops*.
Minor not: magnetic fields induce *current* in loops, which then by Ohm's
law may result in potential differences ("voltage") *across* any two points
on the loop, by the resistance of the loop.
I know *you* know this, Jeff, but I get too many students who talk about
"the voltage through this resistor" and other such abominations to let it
go uncorrected.
Bob Myers KC0EW HP Graphics Tech. Div.| Opinions expressed here are not
Ft. Collins, Colorado | those of my employer or any other
myers@fc.hp.com | sentient life-form on this planet.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!dali.cs.montana.edu!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!sdd.hp.com!ucsd!ucbvax!hplabs!hpfcso!hpfcdj!myers From: myers@hpfcdj.HP.COM (Bob Myers) Newsgroups: sci.electronics Subject: Re: DC motor noise in audio circuit Message-ID: <17660093@hpfcdj.HP.COM> Date: 30 Aug 90 17:47:26 GMT References: <15857@s.ms.uky.edu> Organization: Hewlett Packard -- Fort Collins, CO Lines: 16