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Old 12th November 2007, 04:02 PM   #1
Faust3D is offline Faust3D  United States
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Question DAC - Opinion needed

Hi,

Please take a look at these pics and let me know what do you think about this DAC's design. Thanks guys!

Click the image to open in full size.

Click the image to open in full size.

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Old 13th November 2007, 10:24 AM   #2
oshifis is offline oshifis  Hungary
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A circuit diagram perhaps? BTW, are the output coupling capacitors PIO?
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Old 13th November 2007, 12:11 PM   #3
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After applying gamma correction with Irfanview to the pictures it appears to be a TDA1541 NON-OS DAC with tube outputs.

To me it seems been built extremely messy.
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Old 13th November 2007, 12:51 PM   #4
borges is offline borges  Norway
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It looks like the insides of my 1960's Tektronix 'scope. Except this design has chips in it.

Messyness isn't necessarily a bad thing as long as you keep track of good design practice. If you maintain good grounding (star or plane), small loop area between signal conductor and return, and minimize crosstalk between digital and analog signals, things should be working fine.

How does the DAC perform if you pause the music and turn up the amp? Any 50/60Hz problems with the lid off?


Regards,
BÝrge
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Old 13th November 2007, 02:51 PM   #5
Faust3D is offline Faust3D  United States
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Quote:
Originally posted by oshifis
A circuit diagram perhaps? BTW, are the output coupling capacitors PIO?

Russian military PIO, yes. I need to look for it.
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Old 13th November 2007, 02:59 PM   #6
Faust3D is offline Faust3D  United States
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Quote:
Originally posted by borges
It looks like the insides of my 1960's Tektronix 'scope. Except this design has chips in it.

Messyness isn't necessarily a bad thing as long as you keep track of good design practice. If you maintain good grounding (star or plane), small loop area between signal conductor and return, and minimize crosstalk between digital and analog signals, things should be working fine.

How does the DAC perform if you pause the music and turn up the amp? Any 50/60Hz problems with the lid off?


Regards,
BÝrge
Dead quite. I actually did not make this DAC, it's a my friends design. He is an old school designer, used to design tubes for USSR military. Worked with Vladimir Shushurin back in the day. It's interesting how all of his designs look very messy but sound great.

What surpriced me here is that he hard wired the the input chip CS8412. He basically soldered each leg with silver wire, crazy if you ask me.

Here are a few pics of the amp that he made for me.

Click the image to open in full size.

Click the image to open in full size.

Power supply:

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Old 13th November 2007, 03:04 PM   #7
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Quote:
Originally posted by Faust3D

....

What surpriced me here is that he hard wired the the input chip CS8412. He basically soldered each leg with silver wire, crazy if you ask me.

....

SPDIF sucks...
http://www.diyhifi.org/forums/viewto...&hilit=#p30707
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Old 13th November 2007, 03:15 PM   #8
Faust3D is offline Faust3D  United States
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Quote:
Originally posted by QSerraTico_Tico



SPDIF sucks...
http://www.diyhifi.org/forums/viewto...&hilit=#p30707

Thanks for letting me know.
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Old 14th November 2007, 09:19 AM   #9
MJW is offline MJW  United Kingdom
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Default Birds nest soup

Spdif sucks big time for sure but then so do many of our Brazilian bro's comments! Every time I read a thread he contributes to he's having a sarchastic pop.

I like it. It exhibits the business like craziness of some one who knows what they are doing and is just keen to pull it together so they can listen.

I thought most here had figured out that neat don't mean squat.

Similar to the notion that beautiful women often can't F*** worth a dam.

I once said to a sales person in a generic Hi-Fi shop.

"Look mate, I dont give a stuff what it looks like as long as it sounds fantastic. I don't think you can help me."

He looked back at me bewildered and offered up. "Yeah but everyone likes cool stuff, smart lookin Hi- Fi don't they?"

"Thats the problem" I said. "Somewhere you've forgotten about the music. This is about experiancing and enjoying music in the home, nothing else".

One of the last times I ventured into a shop. Lets face it mostly they sell garbage......
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Old 14th November 2007, 10:14 AM   #10
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Perhaps I should explain why SPDIF is a bad idea and also executed poorly....
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