RE: Power supplies in dacs

Posted by unclestu (D) on July 22, 2015 at 11:51:40

In Reply to: RE: Power supplies in dacs posted by beppe61 on July 21, 2015 at 05:21:08:

Again in digital equipment noise, in effect, is self generating. You got clock chips, sometimes several, running at RF frequencies. Most are metal covered for some shielding, but I like to ground the cases ( some players and DACs do that, BTW). I believe your unit has three clocks.

The digital processing chips themselves are generally plastic encased and thus RFI can easily enter and exit the chips as they process the bit stream data entering the unit.

All the essential circuits work with RF frequencies and they are not synchronized. They radiate within the chassis and they contaminate all power supplies.

The key IMHO, is to attack the source. Obviously you need the digital data, but it is imperative that you try and contain the "RF radiation" they produce.

Easiest way to limit them is to cover all chips and semiconductors with ERS. There is a reason why they are shielded, and I can see some kind of circuit under neath.

The boxes while acting as a shield are not as effective as ERS, because their reflective surface can actually "bounce" some RF off. Again the lowly HK players used a box but lined it with felt to be more absorbent. You can line the boxes with ERS too.

Some have simply lined the entire chassis with ERS, but that does NOT stop the internal RF reflections from bouncing around and contaminating adjacent chips and circuits. also be aware that many DAC's employ a filter on the analog output stage to roll off RF. I've seen this on Regas and even the Esoteric machines. Using ERS with out disabling the roll off circuit simply makes the unit dull.

I did shielding like I described on an Esoteric unit and it indeed sounded dull till I lifted the small ceramic cap off the output stage. The unit then opened up, with an extremely airy quality and a tremendous sense of depth.

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Follow Ups Full Thread

Topic - Power supplies in dacs - beppe61 23:37:30 07/19/15 (29)

Grounding - Lew 21:37:43 07/20/15 (20)

" enhancing the grounding schemes " - beppe61 23:13:42 07/20/15 (19)

Yes,... - Lew 07:56:09 07/21/15 (18)

RE: Yes,... - beppe61 09:36:41 07/21/15 (17)

The lowly - unclestu 20:47:53 07/21/15 (16)

RE: The lowly - beppe61 22:18:42 07/21/15 (15)

RE: The lowly - Lew 06:48:26 07/22/15 (14)

RE: The lowly - Crazy Dave 12:20:54 07/28/15 (12)

RE: The lowly - beppe61 23:02:35 07/28/15 (11)

RE: The lowly - Lew 07:56:47 07/30/15 (10)

RE: The lowly - beppe61 11:33:19 07/30/15 (9)

RE: The lowly - Lew 11:58:59 07/30/15 (8)

RE: The lowly - beppe61 22:37:55 07/30/15 (7)

There may be some truth in what you say,... - Lew 07:06:49 07/31/15 (6)

RE: There may be some truth in what you say,... - unclestu 09:42:08 07/31/15 (4)

On the other hand, ... - Lew 08:47:12 08/02/15 (3)

Beleive - unclestu 12:20:01 08/02/15 (2)

Then there's "jitter" - Lew 16:54:38 08/02/15 (1)

RE: "jitter" - unclestu 18:20:03 08/02/15 (0)

RE: There may be some truth in what you say,... - beppe61 09:14:15 07/31/15 (0)

RE: The lowly - beppe61 09:47:16 07/22/15 (0)

RE: Power supplies in dacs - unclestu 12:41:55 07/20/15 (5)

RE: Power supplies in dacs - beppe61 23:09:53 07/20/15 (4)

RE: Power supplies in dacs - unclestu 23:16:27 07/20/15 (3)

RE: Power supplies in dacs - beppe61 05:21:08 07/21/15 (2)

RE: Power supplies in dacs - unclestu 11:51:40 07/22/15 (1)

RE: Power supplies in dacs - beppe61 23:21:17 07/22/15 (0)

RE: Power supplies in dacs - fmak 03:51:16 07/20/15 (1)

RE: Power supplies in dacs - beppe61 06:04:45 07/20/15 (0)

Follow Ups

RE: Power supplies in dacs - unclestu 11:51:40 07/22/15 (1)

RE: Power supplies in dacs - beppe61 23:21:17 07/22/15 (0)

RE: Power supplies in dacs

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