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Drive NOS AD1865/62,PCM1704/02/63,TDA1541 from FIFO: Universal I2S-PCM driver board
Drive NOS AD1865/62,PCM1704/02/63,TDA1541 from FIFO: Universal I2S-PCM driver board
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Old 13th June 2017, 04:50 PM   #891
Cheng is offline Cheng  Singapore
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Join Date: Dec 2004
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Hi Eldam,

Yes. The Kali has a u.fl mclk out, just that I'm not sure whether it works with the pcm board.

Hi Ian,

Thank you. Yes it is your isolatorpi in the second & third picture. I did not get them to work on the AD1865 & PCM1702. Don't know whats went wrong, as I assume all I2S signal should be a standard.

Maybe I should try your FIFO to isolate the problem. Or maybe it is the opamp IV, but I remember they work well with my other diyinhk dac.

I like to plan the boards positioning for testing before transferring them into a proper chassis

Cheng
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Old 14th June 2017, 08:00 AM   #892
vzs is offline vzs  Europe
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Cheng, did you double check that all I2S connections from DAC pins to source board u-fl or OK? also check at DAC pins the required voltages.
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Old 14th June 2017, 04:40 PM   #893
Cheng is offline Cheng  Singapore
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Hi vzs,

I have double checked all the u.fl connection from kali > PCM board > Dac board. I do not know the problem is the opamp IV or kali>ian pcm compatibility.

Do I really need a mclk data for ian pcm > dac board?

p.s. I have checked & confirmed the 5vdd and +-5Vcc input to the DAC too.

Cheng
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Last edited by Cheng; 14th June 2017 at 05:09 PM.
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Old 14th June 2017, 05:23 PM   #894
vzs is offline vzs  Europe
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Quote:
Originally Posted by Cheng View Post
Do I really need a mclk data for ian pcm > dac board
You need a MCLK to I2StoPCM board only, MCLK range can be 128*Fs to 2048*Fs.
I2StoPCM board uses that MCLK for reclocking the PCM signals sent to the DAC board.
So if you play Fs = 44.1KHz music you need at least 5.6448MHz MCLK for the PCM board.

Try to measure the signal frequencies at the DAC pins. I see you have (at least) a Fluke 115, with that you can check LLLR with 44.1KHz music you should see ~44.1KHz on the meter. If you have a better one measure CLK too.
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Old 17th June 2017, 04:36 AM   #895
Cheng is offline Cheng  Singapore
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Hi vzs,

Today I tried measured the LLLR pin11/pin14 & CLK pin12 on dac pin (ref to DGND pin13 ).

I got 0HZ at the LLLR.

I got 44.1KHZ at the CLK.

Does that means the problem is with the compatibility of kali & Ian pcm board?

Cheng
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Old 18th June 2017, 12:54 AM   #896
Dimdim is offline Dimdim  Greece
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Drive NOS AD1865/62,PCM1704/02/63,TDA1541 from FIFO: Universal I2S-PCM driver board
It means that you should definitely re-check your cabling. 44.1K at (B)CLK points to a mixup in the cables.
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Old 2nd July 2017, 01:30 PM   #897
Cheng is offline Cheng  Singapore
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Hi all,

Manage to get the AD1865 & PCM1702s Dac board to sing with following setup. Can't figure out why it doesn't with the Kali setup. (May try again to confirm)

Rpi>Ian Fifo>Ian Isolator Board>Ian Dual Clock Board>Ian PCM Board >Dac Board>Opamp IV

The reason I got into this project is because I wanted to try old NOS R2R Dacs in simultaneous mode before its all gone in the future And I hope to replace my old cd player (marantz cd63) with HD/Rpi, as the it is so much more convenient.

So far I find both Ad1865 & PCM1702s Dacs set up to sound smooth and detail especially in vocal. My marantz is also very detail and musical, but the sound is abit "on your face", just like other DS dac that I have heard. Next on the test bench will be trying out on different IV output.

Again I would like to thanks Ian for all the nice digital interface boards. It really makes integrating with nos dac so much easier

Cheng
Attached Images
File Type: jpg Closed up view AD1865 setup.JPG (410.5 KB, 264 views)
File Type: jpg Full view AD1865 setup.JPG (396.0 KB, 260 views)
File Type: jpg Testing with 4Khz.JPG (329.2 KB, 244 views)
File Type: jpg Testing with 400Hz.JPG (310.6 KB, 227 views)
File Type: jpg Over View.JPG (394.4 KB, 229 views)
File Type: jpg Close Up View.JPG (396.0 KB, 119 views)
File Type: jpg 4Khz Test Tone.JPG (334.0 KB, 86 views)
File Type: jpg 400Hz Test Tone.JPG (337.4 KB, 82 views)
File Type: jpg Listening test.JPG (176.4 KB, 99 views)
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Old 6th July 2017, 06:37 AM   #898
Luke is offline Luke  New Zealand
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Hi Cheng, nice build. Where did you get the dac board from?
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Old 6th July 2017, 04:06 PM   #899
Cheng is offline Cheng  Singapore
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Hi Luke,

I am the fortunate few who got the dac core board from vzs who generously donated his extra board from Ian.

Cheng
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Old 13th July 2017, 04:19 AM   #900
chansiukwing is offline chansiukwing  Hong Kong
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Default TDA1540

Is it possible connecting this old DAC to the I2S-PCB BOARD?
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