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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
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Old 27th May 2020, 02:33 AM   #8831
godady is offline godady
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I made a big mistake. I tried to replace 1117 to tps7a4701, but I did wrong calculate, output is over 6V, I know it probably burn some part, could someone give me a hint? I need to know where can I start.
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Old 27th May 2020, 02:24 PM   #8832
Ryssen is online now Ryssen  Sweden
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Quote:
Originally Posted by TNT View Post
There are measurements with different size capacitance and its impact in this thread.

//
Well they used 2200uF and the messaurement sems fine.
So there are only 4v over the e-lyts mine can take 16v so its a little bulkier.
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Old 28th May 2020, 04:22 PM   #8833
godady is offline godady
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Quote:
Originally Posted by godady View Post
I made a big mistake. I tried to replace 1117 to tps7a4701, but I did wrong calculate, output is over 6V, I know it probably burn some part, could someone give me a hint? I need to know where can I start.
I think CPU or other two component are burned, I will find the new picese to replace them. Could Søren tell me what model of them?

Click the image to open in full size.
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Old 28th May 2020, 09:09 PM   #8834
soekris is offline soekris  Denmark
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Quote:
Originally Posted by godady View Post
I think CPU or other two component are burned, I will find the new picese to replace them. Could Søren tell me what model of them?

Click the image to open in full size.
Can't see picture, but most likely most parts powered by 3.3V died....
I'll recommend to just purchase a new board, replacing the 256 pins BGA packaged FPGA is not something you can do yourself....
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Old 29th May 2020, 12:24 AM   #8835
godady is offline godady
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Quote:
Originally Posted by soekris View Post
Can't see picture, but most likely most parts powered by 3.3V died....
I'll recommend to just purchase a new board, replacing the 256 pins BGA packaged FPGA is not something you can do yourself....
Too sad.
I removed stm and winbond components, still get short, likely you said.
I like this board very much. I'll purchase a new board when I have enough budget.
Thanks for your reply.
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Old 24th June 2020, 08:24 AM   #8836
EugenKo is offline EugenKo  Russian Federation
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I have been using DAM1021 for several years.
Yesterday I decided to try playing DXD files, (352/24), and I was surprised to hear that everything is reproducing, but the tones are shifted down in frequency, about a half to two times (I haven’t measured yet).
I wonder how is this even possible?

The setup consists of:

NAS Synology + MinimServer
NMR media renderer

DAM1021 (NOS filter)
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Old 24th June 2020, 09:43 AM   #8837
analog_sa is offline analog_sa  Europe
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
So, all other sampling rates play fine? Does the board detect the SR correctly?

My first look would be at the i2s cabling.

Last edited by analog_sa; 24th June 2020 at 09:49 AM.
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Old 24th June 2020, 11:57 AM   #8838
EugenKo is offline EugenKo  Russian Federation
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Quote:
Originally Posted by analog_sa View Post
So, all other sampling rates play fine? Does the board detect the SR correctly?

My first look would be at the i2s cabling.
Yes, up to 192/24 and DSD128 all fine.

I have no indications of SR, this was not required.
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Old 24th June 2020, 12:53 PM   #8839
analog_sa is offline analog_sa  Europe
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
My guess is the DAM determines wrongly the 352kHz. It may be just long connecting wires for the i2s signal. It doesn't sound like something broken in the dac.
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Old 24th June 2020, 02:27 PM   #8840
EugenKo is offline EugenKo  Russian Federation
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Quote:
Originally Posted by analog_sa View Post
My guess is the DAM determines wrongly the 352kHz. It may be just long connecting wires for the i2s signal. It doesn't sound like something broken in the dac.

I think I’ll have to open the device and check the BCK, LRCK and Data signals with the oscilloscope.
 

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