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Old 26th April 2011, 02:15 PM   #21
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Here's how the stock DAC board can be modified: all "unnecessary" components have been removed and 3 discreet regulators added. I'm using MIT RTX 1uF output coupling caps. External PS is the same as in the balanced DAC. Instead of costly BG N 1000/50 I'm using here BG NX 470/16 which works fine too.

I'm also attaching Word document which was compiled by uncle_leon who tried some of the mods already.
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File Type: jpg DD0.jpg (177.3 KB, 3277 views)
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File Type: jpg DD3.jpg (196.0 KB, 2934 views)
File Type: jpg DD4.jpg (191.1 KB, 2822 views)
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File Type: doc DAC v1 to v3 mods.doc (30.5 KB, 741 views)
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Last edited by Peter Daniel; 26th April 2011 at 02:18 PM.
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Old 26th April 2011, 02:30 PM   #22
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Some of the components in a shunt regulator can be hard to source, so this is series regulator we've been using initially. It also works very well and the difference between those two regulators is rather subtle, although shunt seem to sound a bit better when the circuit is built exactly as described.

For 5V output, change 8k25 resistor to 5k. That regulator circuit was also developed by Bobken.
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File Type: jpg r.jpg (153.1 KB, 1818 views)
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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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Old 26th April 2011, 03:13 PM   #23
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Peter,

Any balanced PCBs planned? Keeping with your affinity for short traces I see Neutrik has some nice PCB mountable XLR connectors.

Click the image to open in full size.

Regards,
Dan
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Old 27th April 2011, 02:30 PM   #24
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Quote:
Originally Posted by dantwomey View Post
Any balanced PCBs planned?
I think it would be really hard to convince people these days that TDA1543 can sound better that high res modern DACs

Coming back to the topic, here's a DAC I built for a local customer around Christmas time. He was initially searching for Bidat, but when he audition the Bidat and this DAC in my system, there was no doubt what sounded better. His system required coupling caps so we went with 1uF TFTF V-Caps. The enclosure is a modified AMP-2 chassis.
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Old 27th April 2011, 03:43 PM   #25
c12mech is offline c12mech  United States
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Is anyone sure that Peter does not have a machine shop that is not int the pictures he posts? J/K.

That is absolutely beautiful work Peter. How are the ends attached to the case? I don't see any hardware. Is this the same circuit with the addition of the coupling caps?
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Old 27th April 2011, 03:46 PM   #26
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Quote:
Originally Posted by Peter Daniel View Post
I think it would be really hard to convince people these days that TDA1543 can sound better that high res modern DACs
Do you think most people wouldn't like the Altmann Attraction DAC? Of course we all know that the Altmann is a TDA1543 based DAC.

Regards,
Dan
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Old 27th April 2011, 03:51 PM   #27
massimo is offline massimo  Italy
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Quote:
Originally Posted by Peter Daniel View Post
I think it would be really hard to convince people these days that TDA1543 can sound better that high res modern DACs
We trust you!
Design a suitable pcb and customers will follow. You already got one at least
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Old 27th April 2011, 04:39 PM   #28
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Quote:
Originally Posted by c12mech View Post
Is anyone sure that Peter does not have a machine shop that is not int the pictures he posts? J/K.

That is absolutely beautiful work Peter. How are the ends attached to the case? I don't see any hardware. Is this the same circuit with the addition of the coupling caps?
Those are the enclosures that I had fabricated for AMP2 mono blocks that were on a cover of hi-fi+: http://www.audiosector.com/downloads/hifi+review.pdf

The 3/4" aluminum panels are press fitted into tubing and secured with a single screw only.
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File Type: jpg 3.jpg (193.9 KB, 1036 views)
File Type: jpg pre.jpg (61.6 KB, 763 views)
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Old 27th April 2011, 05:06 PM   #29
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Quote:
Originally Posted by dantwomey View Post
Do you think most people wouldn't like the Altmann Attraction DAC? Of course we all know that the Altmann is a TDA1543 based DAC.
My original DAC quite favorably compared to Altman DAC: Audiosector USB DAC -- my new DAC--(and comparison)

This one, especially when balanced, seems to be much better
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Old 27th April 2011, 05:15 PM   #30
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Originally Posted by Peter Daniel View Post
My original DAC quite favorably compared to Altman DAC: Audiosector USB DAC -- my new DAC--(and comparison)

This one, especially when balanced, seems to be much better
Hmmmmmmmm..................very intriguing.

Regards,
Dan
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