"Reference" TDA1541A DAC with I2S-BUS architecture - Page 17 - diyAudio
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Old 6th October 2010, 04:26 PM   #161
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So, irrespective of the output stage, do you rate the Behringer with up-sampling?
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Old 6th October 2010, 07:02 PM   #162
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Hmm, some people like SRPP, some don't.... this might depend on ears, surrounding equipment, speaker timbre, ..., room, ... not at least cables and the kind of DAC of course.
Personally I have only heard such a circuit with a FET instead of the upper half tube and I liked it very much i a preamp.
So maybe there is not the perfect I/V but a right one for ears, equipment and room.

Enough wisdom

What I read from John (EC Design) his DAC with his I/V stage should offer really really good resolution, stage, details,........just everything...... maybe especially with his most recent DAC MK4. If I'm right, Olivers is more MK2 and I don't remember if Johns stage at this time was the same.

I appreciate Lukasz approach and effort finding the best with his ears and like his entertaining style

John posted that 30 R is max for 1541; Lukasz uses something around 90 R. After John he should gather higher distortion due to that. I haven't tried, but I will.

To find the right I/V stage probably means try and error or try and modify. A simple anode follower stage can sound rather different, depending on kind of biasing (resistors, LED, with or without electrolytics), type of resistors in charge.... In my mind, it shouln'd be too much effort trying different topologies. And one could keep cost low, if used not only Boutique parts for try out stages. Russian tubes are cheap, 2sk170 is still cheap, everything on a wooden board....

I'll try but it will take time, a lot of time.

Btw, the TNT I/V stage should sound very good as well and only cheap parts are used as well.

Hm, some try to implement the new Pass I/V in their 1541. Be quick to get some J74 before you have to buy them in a pharmacy.

And others, all well documented here.....

A lot of time but not that much money

Regards Ernst
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Old 6th October 2010, 07:07 PM   #163
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Quote:
Originally Posted by LucasAdamson View Post
So, irrespective of the output stage, do you rate the Behringer with up-sampling?
It's pretty good. It sounds remarkably similar to the creek cd50mk2, which has a CS dac, and is generally rated very good (in its price range).

I hope the tda1541 project will be better though....
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Old 12th October 2010, 05:36 PM   #164
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Exclamation Personal announcement

Well my friends it is time to say thanks to all of you, who like and ordered my pcbs.

Because i am no developer of electronic circuits but have the knowledge to design pcbs, i wanted to give something back to the community.

Since i started with my 1st pcb, the Optical-Volume-Control on 15th October 2009, a small donation from every sold pcb goes to diyaudio.com

Today i am proud to say that your cumulated donation achieve

$ 1.500

Keep on having fun with my pcbs and best regards

Oliver
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Old 13th October 2010, 07:23 PM   #165
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All modules are in stock again
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Old 14th October 2010, 12:32 AM   #166
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Default All modules are in stock again

Hi Mr. Oliver:

Many congratulations for what you achieved to DIYAUDIO from the sales of your PCB!

Here the modules I want:
+/- Power Supply Module
TDA1541A shunt regulator Module (x2)
Shunt regulator Module for add. +5V line
TDA1541A DAC Module
NL17SZ02 adapter pcb

Cheers,
Antonio
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Old 14th October 2010, 12:32 AM   #167
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Oliver, that's awesome! I can't wait to hear this thing.

I have a question. I only have 12 Stealth diodes left. The +5v and -5v shunt supplies to the chip, can they be fed from 4x diodes, like a DC coupled unit, or is there some reason why I should isolate their earths completely and use 4x diodes each side?

Many thanks
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Old 14th October 2010, 07:43 AM   #168
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Quote:
Originally Posted by LucasAdamson View Post
Oliver, that's awesome! I can't wait to hear this thing.

I have a question. I only have 12 Stealth diodes left. The +5v and -5v shunt supplies to the chip, can they be fed from 4x diodes, like a DC coupled unit, or is there some reason why I should isolate their earths completely and use 4x diodes each side?

Many thanks
My thoughts were to separate all lines. That includes the rectifier.
If you want, you could change it to a symmetrical design like in the DCB1
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Old 14th October 2010, 08:39 AM   #169
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I think I have it - I'll steal 4x Stealth diodes back out of the heater unit of the Tube-I-Zator, and put MUR860s in there.

Am I right in thinking that the heater unit of the tube is not the most audio critical part?

Thanks again!
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Old 14th October 2010, 02:43 PM   #170
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Quote:
Originally Posted by LucasAdamson View Post
I think I have it - I'll steal 4x Stealth diodes back out of the heater unit of the Tube-I-Zator, and put MUR860s in there.

Am I right in thinking that the heater unit of the tube is not the most audio critical part?

Thanks again!
Good idea!
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