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Old Yesterday, 07:59 AM   #1991
paulmarinis is offline paulmarinis  Greece
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Join Date: Sep 2007
Originally Posted by Markw4 View Post
What do you mean by that? What is your understanding on that?
I actually concluded that from your posts, at some point you said that the real differences come with current to voltage conversion and changing capacitors will not do much.
As im not that good at circuit making, is there something ready for current to voltage conversion?
would something like that do?

Current To Voltage I/V Conversion Photoelectric Signal Amplifier Module Emitter | eBay
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Old Yesterday, 09:31 AM   #1992
pentajazz is offline pentajazz  Greece
diyAudio Member
Join Date: Jun 2015
For those who want to try the real time pcm to dsd conversion in foobar2000:

Foobar 2000 for Dummies (Part 1) – General Setup | DIY-Audio-Heaven
Foobar 2000 for Dummies (Part 2) – Playing DSD – New SACD plugin (0.9.x and 1.x.x Series) | DIY-Audio-Heaven
Foobar 2000 for Dummies (Part 3) – Playing DSD – Old SACD plugin (0.8.x and 0.7.x series) | DIY-Audio-Heaven

There are plenty of custom DSD filters to select, 4 different algorithms to convert PCM to DSD based on Philips ProTech tools.

For me there is no need to rely on hardware up-sampling if you are using only audio files on a pc, through spdif or i2s over usb or whatever.

note if connecting to DACs: spdif limit DSD64 (DoP), DSD128+ only over i2s

have fun..

Last edited by pentajazz; Yesterday at 09:35 AM.
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Old Yesterday, 06:27 PM   #1993
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
Originally Posted by paulmarinis View Post
I actually concluded that from your posts, at some point you said that the real differences come with current to voltage conversion and changing capacitors will not do much.
Relatively speaking, changing a few caps won't do much. But, using the right passive components to fabricate I/V and differential stages is important and that point is made by ESS in their documentation.

Of course, the first thing people want to know is, what cheap (or expensive) ebay board will work at least well-enough for upgrading the DAC? For power supplies, there may be a few. Other than that, the answer is none, you have to build it yourself. I have given you pictures of one way of doing it. The schematic for what I did is given in this thread. Information about power supplies and bypassing, its all there.

Basically, that's all there is. Some examples and some advice, but its not be organized as a beginner or kit type of project. One reason for that is when starting out there was no way of knowing what exact architecture would win out. We are only now getting pretty close to the end of knowing everything we need to know to get the support circuitry around the dac chip good enough that we are probably getting back to the point where the dac chip may be the weak link, but we are not quite all the way there yet, IMHO.

Last edited by Markw4; Yesterday at 06:29 PM.
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Old Today, 01:32 AM   #1994
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
Regarding software or hardware upsampling, the only thing I can say is that not all upsamplers are the same. A result, some sound a lot better than others. My recommendations are only for things that I have tried and found to work well. In particular, there are no software upsamplers I am recommending at this time.

Pretty soon I hope to test out the new lower cost AK4317 board from ebay. I may do some mods on it to improve signal integrity for the I/O interconnections. The reason the new board is lower cost is because it is PCM/I2S/DSD input only. There are no SPDIF, TOSLINK, or AES inputs. Assuming it works as well or better than the other AK4317 board with the ES9038Q2M DAC, it would be suitable for those folks using Amanero or XMOS USB boards, and who do not need other types of inputs.

In addition, in order to get very high sample rate PCM/DSD to work with the DAC board I had to modify the board with more ground pins and wire the PCM/DSD interconnection cabling to reduce jitter and ground bounce, and to improve high speed reliability. I will see I if can find the post with pictures of how to do that. Presumably, the same kinds of issues would be likely to occur with an Amanero or XMOS board at the highest sample rates.

EDIT: Pictures of improved PCM/I2S/DSD interconnections: ES9038Q2M Board

Last edited by Markw4; Today at 01:43 AM.
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