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Old 27th October 2012, 01:04 AM   #41
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Quote:
Originally Posted by audiodesign View Post
Here the new measurement with low I/V resistances, the LL1684 with a turn ratio 1:1 is not bad


nice information

thanks!
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Old 27th October 2012, 02:15 AM   #42
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FYI I didn't measure. It just sounded right.
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Old 27th October 2012, 05:52 AM   #43
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Quote:
Originally Posted by reactivepower View Post
FYI I didn't measure. It just sounded right.
OK, I seen it, thank you very much!
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Old 27th October 2012, 06:51 AM   #44
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Quote:
Originally Posted by Ciu View Post
Hello !

Speaking about left D schematic (resistors on primary):
Did you test also, but without grounding CT on primary ?
I didn't have measured, but to "my ears", it sound better with only one resistor (6 ohms) across primary, and x50 tube stage.
Thanks
Richard

My impression too. Not a great difference but definitely better. Maybe the transformer dislikes any small dc imbalance...
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Old 27th October 2012, 08:10 AM   #45
Ciu is offline Ciu  France
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Hello Analog-sa

I happy you confirm what I feel, but without real measures, I will always have a doubt ...
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Old 27th October 2012, 08:35 AM   #46
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I'm following the Dac End R dear quanghao i'm in a dilemma with Dac End 2...
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Old 27th October 2012, 03:22 PM   #47
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Here the last opamp output stage and the relative measurements.

Some capacitors will be add in the future to create a low order filter for high frequency.

P.S. The GND on this module must be the real DAC analog gnd not the Voffest.
Attached Images
File Type: gif OpAmpLast_ver1a.gif (19.1 KB, 619 views)
File Type: gif ES9018_2x5ohm_OPA2134_Bal_2Vrms.gif (60.4 KB, 611 views)
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Old 27th October 2012, 04:47 PM   #48
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Here photo of the output stage
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Old 27th October 2012, 06:21 PM   #49
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Quote:
Originally Posted by yildiray View Post
I'm following the Dac End R dear quanghao i'm in a dilemma with Dac End 2...
Thank,
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Old 28th October 2012, 10:07 PM   #50
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New op-amp output stage.

33pF compensation on first stage

103=0.01uF ceramic compensation on negative shunt

reduced voltage to 12V on outptu stage

OP627 on first stage (with dual chip dip adapter) and OPA2134 on second stage.

now there only a little noise on headphone probably it is possible to eliminate it reducing the voltage gain on first stage and setting I/V resistor to 10ohm instead of 5ohm, I will try soon.
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File Type: jpg OpApmp_out_ver3a.jpg (466.9 KB, 514 views)
File Type: gif OPAmp_ver3a.gif (26.9 KB, 480 views)
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