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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!mcsun!sunic!fuw.edu.pl!cocos!jt
- From: jt@fuw.edu.pl (Jerzy Tarasiuk)
- Subject: Re: Electrical Shielding
- In-Reply-To: datta@cs.uwp.edu's message of 29 Dec 92 00:52:25 GMT
- Message-ID: <JT.93Jan12202142@fizyk1.fuw.edu.pl>
- Sender: news@fuw.edu.pl
- Nntp-Posting-Host: fizyk1
- Organization: Warsaw University Physics Dept.
- References: <1992Dec29.005225.14027@cs.uwp.edu>
- Date: Tue, 12 Jan 1993 19:21:42 GMT
- Lines: 28
-
- >>>>> On 29 Dec 92 00:52:25 GMT, datta@cs.uwp.edu (David Datta) said:
- David> X-Newsreader: TIN [version 1.1 PL8]
-
- David> Is there an easy way to add shielding to cards in a PC? I have a
- David> Creative Labs Video Blaster and a SoundBlaster. Both cards are noisy
- David> and interfere with each other. Is there a way I can shield one from the
- David> other?
-
- First, don't put such a cards on adjacent slots.
- Second, if you have >0.7mm distance between adjacent cards, can put
- shield between them: thin (max 0.1mm) metal (best copper) plate put
- inside at least 0.3mm plastic (don't use too thin or too soft plastic:
- its purpose is to protect electrically connected parts from touching
- the plate, such a touching can cause computer damage!!!) and connected
- electrically to ground (e.g. computer case). Note the metal plate must
- be fixed firmly inside the plastic to make sure it will not touch any
- computer part. It should have size slightly larger than card shielded
- by it. This of course makes electrical shielding only, for magnetic
- shielding need more place: 0.5mm (or more) iron plate + 0.1mm of copper,
- all put inside plastic isolator (for safety), put around the card:
- I -----------------------------------------------+
- I===========the=board=to=be=shielded============ I
- I (elements on the board ..................) I
- I -------------------------the-shield------------+
- I-main board
- The magnetic shield must be made of one plate of magnetically soft iron.
- I just looked into my PC and saw there is 2-5mm between cards, this is
- a lot of space for shielding.
-