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Old 29th July 2019, 11:23 AM   #71
theol is offline theol
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Default Working Sigma Stuio Project

Hi every one !


I'm currently trying all sorts of combinations to avoid the noise on my freedsp.


In order to eliminate a software problem, could anyone send me his fully working Sigma Studio project, tested on a freeDSP SMD-B ?
Maybe my Sigma Studio configuration is wrong…



Thank you very much !
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Old 1st August 2019, 12:49 PM   #72
DarkOne is offline DarkOne  Slovakia
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Quote:
Originally Posted by theol View Post
Hello,





DarkOne, I'm glad that the noise is gone on your FreeDSP !



Unfortunately, on mine, I still have a lot of noise on DAC 2&3. I checked once again all soldering, I changed the power supply, but nothing worked…


I'm a little bit confused and I don't know what to do.


If anyone have an idea.



Maybe I'm gonna send back this board and buy a MiniDPS…
Hi Theol, unfortunately DAC2&3 are still noisy. Measurements are much better than what I posted earlier, it was probably some SW glitch in my measurement rig.
Anyway, DAC2&3 have 15-20dB more noise than the other channels, I posted. When I connect 93dB/2.83V tweeter to amplifier output I hear very low noise from DAC0&1 and loud noise from DAC2&3, so loud that I can hear it loudly 3 meters away.
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Robo
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Old 5th August 2019, 07:28 AM   #73
FrankGersemsky is offline FrankGersemsky  Germany
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Default Connecting external ADC to freeDSP board

Hi,
did you get a response or even better a solution to this question?
I have the same problem, would like to connect an external ADC via I2S but seems like the BCLK and LRCLK input signals are not connected on the board. And the ADAU1701 datasheet clearly says that these two must be externally connected to the I2S master mode output signals (MP10 and MP11).


Frank


Quote:
Originally Posted by marekFreeDSP View Post
Hey,


I have a question.
I've just got mine copy of freedsp-smd-b board from evenelements.


Could you tell me how to connect i2s signal when MP4/MP5 pins are physically not used in the board?
Sigma studio uses those pins for LRCLK/BCLK_IN.


Thanks.
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Old 7th August 2019, 03:17 PM   #74
CyberPit is offline CyberPit  Japan
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Default Set in Hardware Configuration(Top) Tab and...

Quote:
Originally Posted by FrankGersemsky View Post
Hi,
did you get a response or even better a solution to this question?
I have the same problem, would like to connect an external ADC via I2S but seems like the BCLK and LRCLK input signals are not connected on the board. And the ADAU1701 datasheet clearly says that these two must be externally connected to the I2S master mode output signals (MP10 and MP11).


Frank

Hi Guys,
You can configure MPx pins in Hardware Configuration(Topside tab)
then IC1 - 170x¥140x Register Control(Bottom-side Tab)


Simile as my board configuration




DIY DSP PROCESSOR PROJECT PAGE
Cyberpit
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File Type: gif fullportsetup.GIF (349.6 KB, 195 views)
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Old 8th August 2019, 07:13 AM   #75
FrankGersemsky is offline FrankGersemsky  Germany
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Default MP4/MP5 not connected on board

Thanks for the response, but
the problem is that on my freeDSP board (Rev 1.0) the pins MP4 and MP5 are not connected at all. I just saw that there is a new release of the board (Rev 1.1) now available where these pins are connected to new pin headers.
(see also the add-on in the documentation pasted below)


In my case I will need to patch these signals by soldering cabled directly to the IC pins.


Revision 2019 - Information and changes - I²S-Issue



2019 we discovered a essential Problem with the digital audio communication on the SMD-B Board. There were two MultiPurpose-Pins unused (MP4/5), but they’re very important when it comes to getting digital audio on the Board. It turned out that the freeDSP Standard Connector can’t easily send and receive on same hardware/channel. The ADAU1701 requires a BCLK-In and a LRCLK-In for all input channel. These Inputs are MP4/5.


Changes
There was nothing changed in terms of general hardware or layout. That means besides this page the board and the Getting Started is still the same. Please note that the minimal distance to the side is slightly smaller than recommended in the design guidelines.


Additions
MP4 (INPUT_LRCLK) - is now connected to the outside world.
MP5 (INPUT_BCLK) - is now connected to the outside world.






Quote:
Originally Posted by CyberPit View Post
Hi Guys,
You can configure MPx pins in Hardware Configuration(Topside tab)
then IC1 - 170x¥140x Register Control(Bottom-side Tab)


Simile as my board configuration




DIY DSP PROCESSOR PROJECT PAGE
Cyberpit
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Old 8th August 2019, 06:03 PM   #76
CyberPit is offline CyberPit  Japan
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Hello Frank-San,


Sorry, I didn't know that.
Wish your success in modification.



If you feels so much difficult to do,
you can get another digital only PCB like this...
ADAU1401/ADAU1701 DSPmini Lernen Bord Update Zu ADAU1401 Einzigen Chip Audio System-in Ersatzteile & Zubehor aus Verbraucherelektronik bei Aliexpress.com | Alibaba Gruppe


Good Luck!
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Old 19th August 2019, 07:21 AM   #77
mhelin is offline mhelin
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freeDSP site http://www.freedsp.cc has been down recently, what's the problem?
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Old 24th August 2019, 08:28 AM   #78
Baldin is offline Baldin  Denmark
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Hi FreeDSP Users and Devlopers

New to this game, so just started with a set of boards from Sure Electronics (ADAU1701 board, connection board and programmer ICP3).
Works really nice, but turning on gives a big thump in the speakers.
I have a MiniDSP as well, and it has same issue but maybe not as loud.

How have you avoided this in the FreeDSP designs?
Or how would you do it?


I do not really want big relays on the outputs, so searching for other options.
Wondering if the thumb comes from the ADAU1701 it self when powering up or down, or it is the opamps used on the output as filters. What is the source?


This is for sure one of the issues I'd like to tackle before designing a board myself, as connecting this to a big sub with 300W Damp, will make a lot of noise

BR Baldin
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Old 24th August 2019, 10:47 AM   #79
SubSoniks is offline SubSoniks  Wales
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Quote:
Originally Posted by Baldin View Post
Hi FreeDSP Users and Devlopers

New to this game, so just started with a set of boards from Sure Electronics (ADAU1701 board, connection board and programmer ICP3).
Works really nice, but turning on gives a big thump in the speakers.
I have a MiniDSP as well, and it has same issue but maybe not as loud.

How have you avoided this in the FreeDSP designs?
Or how would you do it?


I do not really want big relays on the outputs, so searching for other options.
Wondering if the thumb comes from the ADAU1701 it self when powering up or down, or it is the opamps used on the output as filters. What is the source?


This is for sure one of the issues I'd like to tackle before designing a board myself, as connecting this to a big sub with 300W Damp, will make a lot of noise

BR Baldin
A fairly simple solution is to use PCM5120a boards available on ebay etc, they have a built in mute circuit that prevents pops and bangs during power up/down. They so are able to output 2.1V as opposed to the 0.9V of the Sure board. Needed connections are 5V, GND, BCLK, LRCLK, DATA. An example here, available from many sellers on alibaba, ebay etc

https://www.ebay.com/p/Pcm5102a-DAC-...dule/819603476
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Old 24th August 2019, 03:13 PM   #80
Baldin is offline Baldin  Denmark
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Sure, but the question was also if any of you experience the same, and how to overcome this using the internal DACs and output opamps.
Of course one could end up with so many additional components that just using a DAC which has already taken care of this is a better option.
But would like to hear some experiences. Thanks.
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