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Old 23rd January 2013, 02:34 PM   #371
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Too much work in the company, still not received heatsinks, to be continued next weekend.
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Old 24th January 2013, 07:08 AM   #372
Tyimo is offline Tyimo  Hungary
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O.K.!
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Old 10th February 2013, 04:35 PM   #373
shaan is offline shaan  India
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Hi fellow diy-ers. Hi Andrej. How are you?

Just a few hours ago my ugly board was finished. It's singing some vocals now.

Looking at the schema of vssa I honestly doubt(ed) that it would come even close to its mom soundwise, especially with those electrolytics in the feedback node. But damn, it did! Not just sonics, but the offset, it's fixed and rock steady at 110mV, no different from turn on to right now, no trimming. Man I like this, Fantastic! Finally the last boss in the game has been defeated.

Also the different current injection node is something that tempted me so much that I had to give it a shot just to see that it actually works. It went very well. Got paid in full. Learned something new.

The amp is nothing less than a beautiful gift, simple, transparent, like an earth globe made of glass. Thanks again LC. We are indeed lucky to have you around.

shaan
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Old 10th February 2013, 06:21 PM   #374
Tyimo is offline Tyimo  Hungary
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Hi!
Quote:
Just a few hours ago my ugly board was finished. It's singing some vocals now.
Did you build the original version? V1.2?

Greets:
Tyimo
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Old 10th February 2013, 06:42 PM   #375
shaan is offline shaan  India
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I built the one in the first post.

Some changes: No miller cap, bd139/140 vas, 2x1N4148 for bias, 22ohm vas degeneration, no zobel, no parallel small feedback cap, 10uF input cap(nonpolar electro), 10K current injectors and, ahem, +-15V PS.
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Old 10th February 2013, 06:52 PM   #376
Salas is online now Salas  Greece
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How much current it draws per rail with your two diode gate voltage bias?
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Old 10th February 2013, 07:00 PM   #377
shaan is offline shaan  India
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Hi Salas. It draws 100.1mA in total.
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Old 10th February 2013, 08:42 PM   #378
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shaan, porn please (schematic and photos).
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Old 12th February 2013, 07:29 AM   #379
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Quote:
Originally Posted by shaan View Post
Hi fellow diy-ers. Hi Andrej. How are you?

Just a few hours ago my ugly board was finished. It's singing some vocals now.

Looking at the schema of vssa I honestly doubt(ed) that it would come even close to its mom soundwise, especially with those electrolytics in the feedback node. But damn, it did! Not just sonics, but the offset, it's fixed and rock steady at 110mV, no different from turn on to right now, no trimming. Man I like this, Fantastic! Finally the last boss in the game has been defeated.

Also the different current injection node is something that tempted me so much that I had to give it a shot just to see that it actually works. It went very well. Got paid in full. Learned something new.

The amp is nothing less than a beautiful gift, simple, transparent, like an earth globe made of glass. Thanks again LC. We are indeed lucky to have you around.

shaan
Hi Shaan

Been playing with network streamer player (media renderer) last days, since this should be my source for the future use. It is capable of 24/192 bit perfect streaming from any network shared library and so far it works nicely.

I congratulate you to try VSSA, but let me tell you that you should try the one from my signature link. Although stability compensation scheme is now quite a bit different and it works perfectly, will present measurements plots and pics later this week.

Regards Andrej
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File Type: jpg NMR DAC 2.jpg (611.5 KB, 817 views)
File Type: jpg NMR DAC 3.jpg (663.0 KB, 762 views)
File Type: jpg eLyric 1.jpg (69.6 KB, 717 views)
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Old 12th February 2013, 07:51 AM   #380
sonnya is offline sonnya  Denmark
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Their NMR works fine, and you can use the iphone volume settings to control a discrete volume control.
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