Finished a 2XTDA1541A real balance DAC just for fun

audio-gd · 18th November 2009, 04:08 PM

These days I finished the TDA1541A DAC just for fun.
This DAC apply one TDA1541A for each channels for real balance output.
I apply the passive I/V change, I think passive IV change sound relax than active IV change.
The output is two diamond amps, the LPF only apply -6DB/oct.
There is a programmable Cyclone 2 as the digital filter, it design can work on NOS or OS mode.
In OS mode, it can setting work on 2X , 4X, or 8X oversampling , and the stopband attenuation can setting at -50DB, -90DB or -130DB.
Because apply the Cyclone 2 chip , I can let the TDA1541A work in one channel for balance, unlike apply the SA7220.

audio-gd · 18th November 2009, 04:09 PM

Some other photos

ratza · 18th November 2009, 04:14 PM

Man, that looks absolutely IMPRESSIVE.

audio-gd · 18th November 2009, 04:17 PM

The DAC working without any couple caps and DC serve, the building is quite difficult, I want to measure and match the transistors two times to keep the output offset near 0V.
The power supply is large, it apply 5 units transformers, and 30 groups transistors PSU .
Here is some photos while building.

frenzic · 18th November 2009, 05:25 PM

I'm with ratza.

qusp · 18th November 2009, 05:49 PM

OMG!! thats some serious...errmmm 'discrete' power supply action; in fact they need to come up with another word instead; seems far from discrete.

audio-gd · 19th November 2009, 02:48 AM

Quote:

Originally Posted by qusp

OMG!! thats some serious...errmmm 'discrete' power supply action; in fact they need to come up with another word instead; seems far from discrete.

I conside the PSU very near the signal circuits is better than separate, can avoid the cable effect the SQ and sound color. But this just different viewpoint by different designer.

flyboi · 19th November 2009, 02:07 PM

Wow! Looks good! So, how is the sound?

guido · 19th November 2009, 05:56 PM

I agree it looks impressive. Some thoughts though:
- are the signals reclocked after the cyclone? I'm wondering about jitter.
- the cyclone seems overkill. With a pmd100 you can easily get the same setup (ok, without nos and filter settings). And not easy to get anymore, but still.
- looking at the block diagram, the output current has to travel a long way from left to right dac output. mmm..

Just my 2 cents without having details. A schematic would help :-) Had a look on the website, they actually do have designs with pmd100. Curious.

piero7 · 19th November 2009, 11:00 PM

18th November 2009, 04:14 PM	#3
ratza diyAudio Member Join Date: Dec 2007 Location: Sibiu, Romania	Man, that looks absolutely IMPRESSIVE. __________________ Any solution is a compromise.

19th November 2009, 05:56 PM	#9
guido diyAudio Member Join Date: Mar 2002 Location: diepe zuiden	I agree it looks impressive. Some thoughts though: - are the signals reclocked after the cyclone? I'm wondering about jitter. - the cyclone seems overkill. With a pmd100 you can easily get the same setup (ok, without nos and filter settings). And not easy to get anymore, but still. - looking at the block diagram, the output current has to travel a long way from left to right dac output. mmm.. Just my 2 cents without having details. A schematic would help :-) Had a look on the website, they actually do have designs with pmd100. Curious. __________________ GuidoB

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18th November 2009, 05:25 PM	#5
frenzic diyAudio Member Join Date: May 2003 Location: http://www.last.fm/user/frenzicatlast	I'm with ratza.

18th November 2009, 05:49 PM	#6
qusp Sometimes a square peg fits a round hole just fine diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	OMG!! thats some serious...errmmm 'discrete' power supply action; in fact they need to come up with another word instead; seems far from discrete.

19th November 2009, 02:07 PM	#8
flyboi diyAudio Member Join Date: Dec 2004 Location: .	Wow! Looks good! So, how is the sound?

19th November 2009, 11:00 PM	#10
piero7 diyAudio Member Join Date: Apr 2009 Location: Matera

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