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Old 20th December 2016, 07:59 PM   #1341
levelUP is offline levelUP  Lithuania
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Hello, everyone.
I would like to share my experience with dam1021 dac's
currently comparing dam1021 fully balanced version mixed filter with PCM1704 x 4chips in nos mode, sowter transformers. Everything feeds on A123 batteries. Without voltage regulators as possible. Usb interfaces: waveIO 3,3V battery modded / m2tech OEM / singxer F1 battery modded ( F1 is the best, then m2tech, then waveio).
It little bit winning in dynamic over PCM1704, but completely loosing in speed/ resolution. I was hoping for better performance from dam dac.
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Old 21st December 2016, 12:54 PM   #1342
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This is corrected.
1021filt.1.6.zip
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Old 21st December 2016, 02:47 PM   #1343
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Quote:
Originally Posted by levelUP View Post
Hello, everyone.
I would like to share my experience with dam1021 dac's
currently comparing dam1021 fully balanced version mixed filter with PCM1704 x 4chips in nos mode, sowter transformers. Everything feeds on A123 batteries. Without voltage regulators as possible. Usb interfaces: waveIO 3,3V battery modded / m2tech OEM / singxer F1 battery modded ( F1 is the best, then m2tech, then waveio).
It little bit winning in dynamic over PCM1704, but completely loosing in speed/ resolution. I was hoping for better performance from dam dac.
It is not necessary to run the batteries without regulator/chargers for best sound.

How long are the voltages staying constant while playing music? Are you using the onboard regs of the SOEKRIS using the batteries to power the onboard regulators? If this is the case your are missing most of the advantages of battery power.

Is the DAC you are comparing to using the same basic powering scheme as what you have used for the SOEKRIS?

Most people condemn the SOEKRIS for having less than stellar dynamics. I have not been bothered by this but it does stand out in your assessment.
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Old 21st December 2016, 11:39 PM   #1344
levelUP is offline levelUP  Lithuania
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voltages staying constant 3.2V ~ 8 hrs with 4 cells ( 2X dacs) it's better to remove all unused opamps, regulators as they consume power.
Click the image to open in full size.

Last edited by levelUP; 21st December 2016 at 11:47 PM.
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Old 22nd December 2016, 12:36 AM   #1345
soekris is offline soekris  Denmark
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Quote:
Originally Posted by levelUP View Post
voltages staying constant 3.2V ~ 8 hrs with 4 cells ( 2X dacs) it's better to remove all unused opamps, regulators as they consume power.
How do you get -4V from a LT3042 ??

The reason to the distortion at -3.2V only is the jfets, their gate-drain diodes start to conduct without the higher off voltage to the gates. Or you could just remove the jfets, but then you get the turnoff thumps.... Or connect -6.4V to J2 pin 9 instead of -3.2V.

The onboard vref regulators are better then an external LT3042, but then, 6.4V will kill an opa365.... If you insists then ensure your regulators are very close to the dam1021 and connected with thick wires.... You might want to verify than vref ripple is less than 1mV pp.

You might want to use the "soft" filter settings, sounds like it will more to your liking....

Since your're using the unbuffered outputs you need to keep the wires reasonable short, in balanced mode the Zout is 1280 ohm.

And btw, your postings really belong in the main dam1021 thread....
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Old 27th December 2016, 04:01 AM   #1346
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Quote:
Originally Posted by oneoclock View Post
This is corrected.
Attachment 587039
Yes, it's working now.
Thank you very much
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Old 11th January 2017, 12:26 PM   #1347
levelUP is offline levelUP  Lithuania
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Quote:
Originally Posted by soekris View Post
How do you get -4V from a LT3042 ??
with ~40K resistor Rset
Also it's working possible to get 1,2V

Last edited by levelUP; 11th January 2017 at 12:49 PM.
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Old 11th January 2017, 04:20 PM   #1348
soekris is offline soekris  Denmark
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Quote:
Originally Posted by levelUP View Post
with ~40K resistor Rset
Also it's working possible to get 1,2V
No, how do you get negative voltage from a positive voltage regulator ??
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Old 11th January 2017, 05:43 PM   #1349
levelUP is offline levelUP  Lithuania
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Quote:
Originally Posted by soekris View Post
No, how do you get negative voltage from a positive voltage regulator ??
batteries should be without center tap Click the image to open in full size.
but the scheme become little bit complex, it's easier with 3,2V instead of 4V

Last edited by levelUP; 11th January 2017 at 05:50 PM.
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Old 11th January 2017, 06:08 PM   #1350
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Yep, it works as long as the voltage sources are isolated.
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