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From: Nandu@cup.portal.com (Narendra J Kulkarni)
Newsgroups: sci.electronics
Subject: Re: How to reduce noise from light dimmers?
Message-ID: <35639@cup.portal.com>
Date: 6 Nov 90 02:00:52 GMT
References: <1458@eastman.UUCP>
Organization: The Portal System (TM)
Lines: 6

Most of the cheap dimmers chop the sine wave using triac and do not use
zero crossing and this generate lot of RFI, AM stations are more sensitive
to this, you can try to reduce the noise by shielding the dimmer with a metal
wire mesh / or solid metal case, using toroid ferrite bead in the line, these
will help only to a limited case, also try orienting the AM radio antenna
if all fails then buy a new dimmer