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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Q for the techno boffins - screening IC 's posted by Adam on January 25, 2000 at 17:07:34:
After reading your earlier post I think some further explanation is in order.First, the majority of CD players on the market today have adequate, but not ideal, shielding from stray RFI. The casework of the player provides a barrier, both from reflection and a bit of dissipation through the earth ground.
Second, the purpose of the sheild that you read about is most likely to reduce emissions from the digital IC's WITHIN the CD player. A number of the IC's in a CD player can produces spurious RF emissions if not carefully controlled. So, most likely the best approach is to add sheilding around the servo-contol and RF demodulator (which these days are usually together on one board), and the clock crystal. Does any of this sound familiar from the article?
The other approach is to shield the analog reconstruction filter and output stages. The method that will work the best will depend upon the internal layout of the player. Since each successive generation of CD players have increased the use of surface mount devices and VLSI, it is often hard to tell where the digital circuitry ends and the analog begins. Low end players will not have the same attention to detail concerning placement and isolation from RF because it is expensive, time-consuming and takes a certain amount of practice and natural talent. You might direct a post to Victor Khomenko who probably has a lot of experience from his time at Hewlett-Packard. He can at least offer his experience from the design of the BAT player.
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Follow Ups
- Adam: Some more thoughts . . . - patentguy 14:17:16 01/26/00 (1)
- Hey thanks guys........ - Adam 15:22:34 01/26/00 (0)
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