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Old 29th January 2013, 03:38 AM   #2061
qusp is offline qusp  Australia
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Quote:
Originally Posted by KlipschKid View Post
Please post a video on Youtube of your psu as you switch on. ;-)
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Old 29th January 2013, 08:04 AM   #2062
Coris is offline Coris  Norway
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Originally Posted by KlipschKid View Post
Please post a video on Youtube of your psu as you switch on. ;-)
I see, you want to watch the smoking things...

You know, it is not this a big problem when start to load such capacities (without smoking...). It could be a problem about how long time will take such process... And it could be a challenge to find a solution to get rid of that energy after power off...
Thanks to RayCtech if he can come with some comments about those aspects.

I will see... I think it is an interesting area to experiment... Anyway, experimenting is not synonym to succeeding in a task, or have the solution for something.
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Old 29th January 2013, 10:34 AM   #2063
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I hope not... probably your psu has current limiting ? So it simply.... won't work. But maybe you can pre-charge the caps with a car battery.... perhaps hard to do with a 3.8V DAC.... as Ray said, you really do have to design for large caps/cap banks. It's a real challenge to just add them later and not mess something up.

Besides anything else, big caps have a certain sound.... so you might consider bypassing them with fast caps - film caps like Sonicap in decades - 10uF, 1uF - and then even faster Vishay MKP1837 0.1uF, 10nF or Relcap RTE. Anyway, maybe you know all this already ... but it's worth repeating since this thread seems to have turned this way.

Personally, having tried this kinda thing before, it's not a sound I like. I winced when I saw the Audiocom board, and hoped none of the solid polymer caps were on analogue power lines. Each to their own I guess.

Last edited by KlipschKid; 29th January 2013 at 10:36 AM.
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Old 29th January 2013, 11:09 AM   #2064
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Originally Posted by Coris View Post
You know, it is not this a big problem when start to load such capacities (without smoking...). It could be a problem about how long time will take such process... And it could be a challenge to find a solution to get rid of that energy after power off...
You need to evaluate the circuits you need and implement that..

With 1F to 10F capacitors I have implemented circuits that can charge and discharge them or simply disconnect and connect them after the initial charge.. In some cases also MCU control or a simple logic control for protection and safety.
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Old 29th January 2013, 12:12 PM   #2065
qusp is offline qusp  Australia
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just use properly low noise regs that dont need such crazy filtering in the first place, or batteries, since thats effectively what caps are at that size. just putting them on normal regulators or wide bandwidth flea type regulators is an experiment doomed to fail, a dangerous one, since you seem to insist on DC coupling.

Coris I see you only took these suggestions by Ray as positives and did not notice the strong warnings as well as thanking him for the things he said, some things that I have been saying to you for months. enjoy that extra 1-2db you might get from higher AVCC, that 1-2db will be swallowed well and truly by your following gain structure. remember ive been through this with you, this will only ADD to your problems here. your poweramps have significantly more gain than you can use already.

first things first....

seeing to your gain structure will provide much more tangible improvement than increasing AVCC, or adding huge caps. this was yet another conversation where my trying to help you, linking to the articles etc, turned into you playing the victim because what I said wasnt what you wanted to hear.

you continue to push in a direction that brings you no benefit while the rest stays the same, in fact it will bring more harm. with so much gain already on your IV stage, you could probably use 3-6db of gain before the amps start distorting.
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Old 29th January 2013, 01:37 PM   #2066
Coris is offline Coris  Norway
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Man, I have normal ultra low noise voltage regulators in function today (and for few month ago)! And they work very well.

I do not take or took the Ray`s suggestions just blind as positive. He came her with the information that he used huge capacities. I used too this quite big decoupling capacities with good results (but not so big as him). So it seems to me that it is possible one can also use huge filtering/decoupling capacities. I only found this idea interesting. Is my opinion. I do not know how it will work, and what kind of improvement it will bring, or if it will bring at all something. I just want to try and see what it may happen.

Else, yes I know that decoupling capacities it have to be paralleled in different ways/values/types, to work as it should.

As soon as I will have the opportunity to start to work again in this field, I will review the gain distribution/levels in my system, and I will come back here with details.

I`m aware that improvements it may come from different directions. I have tried only few, I know that. After I will be comfortable with what I get in one direction I will switch to another one. This is my strategy so far.

Else I care enough to not destroy something, as it cost quite much... I do not do it to destroy things, or take blind risks without take precautions...

Unfortunately, I can not show you how well it works my actual system. But just believe me that it works just fine... with all that "bad things" in it: huge overclocking, over AVCC power, big decoupling capacities, huge gain in the system, no any HF filtering, but low HF noise anyway, and so on...
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Old 29th January 2013, 10:57 PM   #2067
Bunpei is offline Bunpei  Japan
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Hi, Coris and RayCTech,

Why don't you create your own threads to show your ideas, observations, manifests, and so on, for your proprietary ultra spec DAC or your out-of-spec application of ES9018?

Bunpei
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Old 30th January 2013, 06:26 AM   #2068
Coris is offline Coris  Norway
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There is actually already created that thread (ESS9018 - try new, try more...)

Sorry for disturbing you here with my interventions. I did not think it were so painfully...
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Old 1st February 2013, 08:36 PM   #2069
mjz3348 is offline mjz3348  United States
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Default Computer DAC

Can someone recommend a complete USB DAC using the ESS Sabre chip?
Plug and play.

Thanks
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Old 1st February 2013, 08:58 PM   #2070
exa065 is offline exa065  Canada
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Quote:
Originally Posted by mjz3348 View Post
Can someone recommend a complete USB DAC using the ESS Sabre chip?
Plug and play.

Thanks
Since our DACs are not "plug and play", I would recommend Anedio Affordable High-End Audio
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