DIY Analog-to-Digital Converter project.Audio measurements tool - Page 18 - diyAudio
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Old 17th January 2012, 02:40 AM   #171
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Join Date: Jul 2010
Quote:
Originally Posted by Frex View Post
Hello all,

As i had already say in my previous post, the 10M resistor can be any tolerance (1-5%).It's not critical. Just use metal film resistor, no carbon type.
Tolerance noted in the BOM is a mistake. Sorry.

AR2, i'm glad you finally got your PCB !
Now you can start the job

Valeriano have finish his wiring and seem to have a working ADC (correct me if i'm wrong).He has report me a mistake concerning the two resistor R49 and R50.
(divider of the LT1963 voltage regulator).
For proper work you should solder as below :
R49=750 Ohms (but no 249)
R50=249 Ohms (but no 750)

I will notify that on the wiki page for all users.

AR2, i already have built two audio DAC , they just has not been described on the forum yet.
Just two pictures for you.

Click the image to open in full size.

Click the image to open in full size.

Regards.

Frex

Hello Frex,

Where can I read more about this project? This DAC looks very versatile! How did you implement the USB connectivity?

Thanks,

Mike
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Old 17th January 2012, 05:15 AM   #172
Frex is offline Frex  France
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Hello,

Unfortunatly, the web site that i had started to design some month ago is not yet ready and i don't have described this project on DIYaudio.
Probably because many DAC design has already designed and described on DIYaudio !

But yes, this DAC is very versatile.
The USB input use the very common PCM2906 that allow only 16bit/44-48kHz operation, but the internal
DACs are dual PCM1792A in mono mode with fully differential operation.
Optical and coax input can handle 24bits/192kHz.
The DAC can be controlled (digital volume and mute) with any RC5 compatible remote control.

If you are interested by the project, i have some bare PCBs of this design that i can sale. Of course, all design files will be provided.
If many DIYers ask me, i could also strat a dedicated thread.

HERE, you can read the full schematics.

Regards.


The PCB view :

Click the image to open in full size.

The internal view:

Click the image to open in full size.


FRex
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Old 18th June 2013, 02:44 PM   #173
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Hi Frex ,

Dropped a mail to contact@oneaudio.com , if it is not up , please drop me a mail to dasgupta.s@outlook.com

Suranjan
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Old 18th June 2013, 08:01 PM   #174
Frex is offline Frex  France
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Hello hunter,

I have send an answer at you e-mail address.
Regards.

frex
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Old 29th June 2013, 04:45 PM   #175
RNMarsh is offline RNMarsh  United States
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Uh... why is this called an A to D project when it is about a D to A?
I am looking for the lowest THD ADC on the planet.

Thx-RNM
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Old 30th June 2013, 08:22 AM   #176
Frex is offline Frex  France
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Hello RNM,

Maybe you could read the thread at it's start, will help you to understand the title.
This page speak about another of my projects that is effectively an DAC.

RNM, you seem to search the Grail.
To my experience and despite it's oldness the AK5394 seem to be again the best audio ADC with lowest THD and noise floor.
A newer ADC from ESS (ES9102) seem interesting on the paper, but despite it's announcement from many years now, i don't have read a serious review of it's real world specs and measured THD/noise performance.. Only some promises...

I have also burn many time and effort to find a good THD measuring system, and the better ADC i've find is the LTC2377-20 from Linear Technology. The specs say -125dB !But no EVM available.
The best compromise (to my opinion) is the LTC2378-18 or LTC2389-18.
The first is a 18 bits 1Msps ADC with THD of -124dB@2kHz, and the second is a 18bits 2.5Msps ADC with THD -116dB@2kHz.
Each of this ADC have their EVM available for sale at about 450 USD.

It's not a audio ADC, but i think these EVM could be a very very good piece of gear !
The analyzing bandwidth is much wider that any delta/sigma ADC, that can give interesting informations in spurious noise of audio equipment (and others).
Maybe all of that will help you a little in you quest !
Regards.

Frex
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Old 30th June 2013, 08:30 AM   #177
jcx is offline jcx  United States
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the AD PulSAR parts hold up much better in the datasheet thd vs frequency plots compared to the LTC ADC
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Old 30th June 2013, 10:25 AM   #178
Frex is offline Frex  France
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Hello Jcx,

You answer is a little short, don't you think ?
Comparing ADC specs is no so easy because many parameters must be carefully read.
Could you start to say what ADC are you comparing exactly ?

FRex
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Old 30th June 2013, 05:42 PM   #179
RNMarsh is offline RNMarsh  United States
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This all good stuff. yes, the Grail. I can now accurately measure below the ADC levels so now want to have the best ADC I or you can find as a basic additional tool.

The fast ADC will be very insightful during transient analysis.... finding issues that nice easy sine waves do not invoke in a product.

What can I beg, buy, borrow or steal that are available in some finished or simi-finished form? All input welcome.

Thx RNMarsh
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Old 1st July 2013, 03:28 AM   #180
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Bonjour Frex!
Tu tombes en plein dans le mille avec moi pour ce genre de projet!
Je suis du Québec!
And now, I guess we are better to continue in english!

This is the kind of projects that rekindle my interest in DIY. Let me read all the thread and I will come back later.
My current need is a 8 chanels of ADC to ADAT for a mic preamp I am building.
Thanks for this!
Luc
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