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Article #2040Re: High-pitched whine
From: braner
Date: Sat, 27 Sep 1986 20:50
Date: Sat, 27 Sep 1986 20:50
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[] According to Atari (in a memo they sent to dealers), the high-pitched whine comes from the "inverter" chip, a little DIP on the mother-board that converts +12V to -12V. It oscillates to do it, ==> whine. The only (?) load on the -12V line is the RS232 port and related driver chip (1488). So it is not surprising that whatever is plugged in there affects the whine. Atari has also sent the dealers instructions on how to eliminate the whine, which I posted here a while ago. - Moshe Braner
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!cbatt!ihnp4!qantel!intelca!oliveb!hplabs!tektronix!uw-beaver!cornell!batcomputer!braner From: braner@batcomputer.TN.CORNELL.EDU (braner) Newsgroups: net.micro.atari16 Subject: Re: High-pitched whine Message-ID: <1114@batcomputer.TN.CORNELL.EDU> Date: Sat, 27-Sep-86 16:50:10 EDT Article-I.D.: batcompu.1114 Posted: Sat Sep 27 16:50:10 1986 Date-Received: Tue, 30-Sep-86 07:34:40 EDT References: <860925115730.1.TYSON@ELCAPITAN.ARPA> Reply-To: braner@batcomputer.UUCP (braner) Organization: Theory Center, Cornell University, Ithaca NY Lines: 11