Article View: sci.electronics
Article #8245Re: How to reduce noise from light dimmers?
From: David Lesher,,255RTFM,255rtfm
Date: Thu, 08 Nov 1990 22:29
Date: Thu, 08 Nov 1990 22:29
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Others said: >The problem is that they use a triac to cut off the current in the middle of a >cycle. As it is the current shuts off very quickly, generating all sorts of >RF noise. Ahemmm....... Unless they are using GTO [Gate Turn Off] devices, dimmer triacs can only turn off at the zero-crossing. They work by delaying turn on until later in the cycle half. That's where the noise comes from. -- A host is a host from coast to coast.....wb8foz@mthvax.cs.miami.edu & no one will talk to a host that's close............(305) 255-RTFM Unless the host (that isn't close)......................pob 570-335 is busy, hung or dead....................................33257-0335
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<1990Nov08.222904.9443@mthvax.cs.miami.edu>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!ncar!umigw!mthvax!wb8fozReferences:
<1458@eastman.UUCP> <35639@cup.portal.com> <1990Nov6.133221.7556@athena.mit.edu> <3987@osc.COM>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!ncar!umigw!mthvax!wb8foz From: wb8foz@mthvax.cs.miami.edu (David Lesher,,255RTFM,255rtfm) Newsgroups: sci.electronics Subject: Re: How to reduce noise from light dimmers? Keywords: dimmer, RF Message-ID: <1990Nov08.222904.9443@mthvax.cs.miami.edu> Date: 8 Nov 90 22:29:04 GMT References: <1458@eastman.UUCP> <35639@cup.portal.com> <1990Nov6.133221.7556@athena.mit.edu> <3987@osc.COM> Reply-To: wb8foz@mthvax.cs.miami.edu (David Lesher) Distribution: na Organization: NRK Clinic for habitual NetNews Abusers Lines: 17