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Old 25th October 2012, 05:55 PM   #31
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To create a set of measurements is necessary only a normal sound card and the freeware Arta software.
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Old 25th October 2012, 11:23 PM   #32
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Quote:
Originally Posted by reactivepower View Post
I used a pair of Jensen output transformers directly connected to the ES9018 output and was quite happy with the sound. I selected the Jensen because they seemed to be built on science and theory not snake oil. Jensen also has a well written book on audio transformers on their website. I used the JT-10KB-D step down transformer to give me 0.6 V output, which was perfect for the gain of my amp. Also, I picked a slightly higher resistance than recommended on the output and loaded it with my amp input impedance in parallel to give the right value. It worked really well and I was quite happy with the low end. I had tried another configuration with an I/V stage before the transformer but found the low end frequency response to be rolled off. Maybe just try different configurations with the transformers you have to see if you can get the sound you are looking for.
I plan to do the PCB has the following output:

1. DAC output signal directly-you can use the manufacturer's standard IV with 3 opam A797.
2. DAC using the or iV Output used a pre opam or tube

3. DAC output signal through a transformer LL1674 or equivalent. You can buy it and add your own.
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Old 25th October 2012, 11:28 PM   #33
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I plan to do the PCB has the following output:

1. DAC output signal directly-you can use the manufacturer's standard IV with 3 opam A797.
2. DAC using the or iV Output used a pre opam or tube

3. DAC output signal through a transformer LL1674 or equivalent. You can buy it and add your own.
Attached Images
File Type: png dac.png (59.9 KB, 785 views)
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Old 25th October 2012, 11:37 PM   #34
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and this is the lyout part complete DAC-end R.with the following dimensions:

110 mm x 210 mm.
I plan to do with all kit components paste, used industrial welding machines.
Note that the kit is not LL1674 transformer, you need to purchase it separately and welding kit.

You look at this project, thank you!
Attached Images
File Type: jpg dac-22.jpg (257.2 KB, 772 views)
File Type: jpg 32.jpg (138.8 KB, 724 views)
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Last edited by quanghao; 25th October 2012 at 11:47 PM.
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Old 26th October 2012, 11:02 AM   #35
Ciu is offline Ciu  France
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Quote:
Originally Posted by audiodesign View Post
Looking for a good I/V for this project I have started a series of test with output transformers.

There is another thread about ES9018 and transformers.
Buffalo II & transformers

The trasformers can be placed bofore or after the resistors of the I/V.

I have modified the schematic of Joe Rasmussen.
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
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Old 26th October 2012, 11:13 AM   #36
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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
yes, i use the iv passive 5R ( parallel 2x 10R) but i not use out put tranformer, I use balnce op am. the sound i like!
Thanks
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Old 26th October 2012, 11:36 AM   #37
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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
Where you connect the central ?
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Old 26th October 2012, 03:26 PM   #38
Ciu is offline Ciu  France
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Quote:
Originally Posted by audiodesign View Post
Where you connect the central ?
Hello !

I don't have any central .... I use Jensen JT-11-emcf transformer
The resistor is across the primary, the + - are always 180 of phase, so the current is flowing, and as ESS said early, the ESS9018 output is "sourcing/sinking"

Would you explain the "theory" with CT grounded, and if you could test, it would be nice
Thanks
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Old 26th October 2012, 06:25 PM   #39
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Here the new measurement with low I/V resistances, the LL1684 with a turn ratio 1:1 is not bad
Attached Images
File Type: gif ES9018_2x5ohm_LL1674_150mVrms.gif (60.7 KB, 676 views)
File Type: gif ES9018_2x10ohm_LL1684_100mVrms.gif (60.4 KB, 646 views)
File Type: gif ES9018_2x5ohm_LL1684_50mVrms.gif (60.6 KB, 158 views)
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Old 26th October 2012, 06:49 PM   #40
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If we use the tranformer we don't need a balanced differential vacuum tube stage so we could use this circuit.

It is a variation of the TEM 3200 6moons audio reviews: Thorens TEM 3200

It is a DC coupled vacuum tube stage without the output capacitor.

The negative voltage is variable with an auto-set to get always zero volt on output.

The second stage is driven on g2 grid and the low global feedback is optional not necessary.
Attached Images
File Type: gif OutDC1.gif (12.0 KB, 265 views)

Last edited by audiodesign; 26th October 2012 at 06:52 PM.
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