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Old 7th December 2011, 03:27 PM   #4061
dady is offline dady  Argentina
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Default Hi Sir, about your octal DAC...

Quote:
Originally Posted by -ecdesigns- View Post
Hi triode_al,



These are the crystals I bought:

CITIZEN AMERICA|HC49US11.2896MABJ-UB|CRYSTAL, 11.2896M, 18PF CL, HC49 | Farnell Nederland

They are specified at 11.2896 MHz and I received crystals with following printings: 11.2C76 and 11.2C63
Now I recognize that is to late for say something, I Tried to read all the Forum posts about your creation, not only yours findings further the comments of the whole group, and the testimonial from another Dutch colleagues that listened your Frankenstein monster. Until discover this point of view about DAC non oversampling.
At the year 2000 I Build one DAC with four 1543 in Comodoro Rivadavia Argentina.
Since 2005 until now living in Europe more close to the technology after a lot of DACs i got, I am amazed with this topology and I need to try again. I understand that now i am servicing from your findings and your developments and like cook receipt I want to get all the info about it.
Do you have the whole project, schematics, pcb or at last pcbs for sale?
Thanks in advance for your generosity.
Esteban Bikic
dady@comodoro.com
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Old 8th December 2011, 03:07 AM   #4062
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ECDesigns,

I am in AWE of the work you've put into optimizing your DAC. It is as clean and slick as any audio circuit I've seen with some truly unique and groundbreaking ideas!

Now after all that flattery, a quick question... I get that you don't select any of the components by 'accident'. But did you compare the Cornell-Dubilier acrylic SMD film caps to any of the other ones available like the Panasonic PPS?

Also, what were the best type of ceramics that you found for PS bypassing and can you say more about the issues you saw with them?

TIA!

Greg in Mississippi
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Old 10th December 2011, 01:23 PM   #4063
dady is offline dady  Argentina
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Default The horn from the corner is Tanoy?

Quote:
Originally Posted by maxlorenz View Post
Well, I am tweaking my DIDACs from DI16 and DI8x4 to DI4 or DI4x4...
On one of my DACs I added TeddyRegs for the output section (still LM4562, active IV) and the TeddyReg for the DAC chips was reduced to 5V (4,8 under load...).

Next (I hope this week) I will try the DATA and WS attenuators.
Apart, I got 220R SMD resistors for BCK...is it still OK, John?

I never asked this before, what is the reason to make the attenuator referred both to ground and to VCC? Has to be that the signal can be High or Low, right?

Is it OK if I put 22R in series to all signals from the timing chain???

I will show some picks of my test DI4.

Picasa Web Albums - mauricio - DIDAC
You can see the 4 Teddyregs...two for the DACs and two for the opamps. TeddyRegs rule!

Picasa Web Albums - mauricio - DIDAC
This one shows the mess with the PCB to adapt it...and DACs PS bypass caps arrangement. I increased 4K7 Rref to 18K...I still do not get the do-not-connect-it thing...

Advices are welcome...
Cheers,
M
Edit>
Sorry, double post while uploading images. Could the kind administrator delete the previous one?
Hi Maxlorenz.
I see you live on Osorno, I had friends from this part of the planet and very good people I knew at Comodoro Rivadavia.
I come following this forum about the DACs (TDA 16bit) i just discover last week because i got a CD player with 1541 and look for some improvement in the peformance and found this monster blog. I made one DAC no oversampling 11years ago with four 1543 with receiver 8411 i guess, the circuit worked marvellous but i abandon for get more complex and modern ones. I started to read fast at the beginning but after two days I discover that this blog is an eternal source and fountain of wisdom, for this reason I restarted to read more carefully and become more tempting to re see or better, try to build one. I noted amazed in your pics the corner horn because i like full range speakers and horns.
Receive my regards from Spain compadre
Esteban Bikic
dady@comodoro.com
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Old 10th December 2011, 01:44 PM   #4064
dady is offline dady  Argentina
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Default The horn from the corner is Tanoy?

Quote:
Originally Posted by maxlorenz View Post
Well, I am tweaking my DIDACs from DI16 and DI8x4 to DI4 or DI4x4...
On one of my DACs I added TeddyRegs for the output section (still LM4562, active IV) and the TeddyReg for the DAC chips was reduced to 5V (4,8 under load...).

Next (I hope this week) I will try the DATA and WS attenuators.
Apart, I got 220R SMD resistors for BCK...is it still OK, John?

I never asked this before, what is the reason to make the attenuator referred both to ground and to VCC? Has to be that the signal can be High or Low, right?

Is it OK if I put 22R in series to all signals from the timing chain???

I will show some picks of my test DI4.

Picasa Web Albums - mauricio - DIDAC
You can see the 4 Teddyregs...two for the DACs and two for the opamps. TeddyRegs rule!

Picasa Web Albums - mauricio - DIDAC
This one shows the mess with the PCB to adapt it...and DACs PS bypass caps arrangement. I increased 4K7 Rref to 18K...I still do not get the do-not-connect-it thing...

Advices are welcome...
Cheers,
M
Edit>
Sorry, double post while uploading images. Could the kind administrator delete the previous one?
Hi Maxlorenz.
I see you live on Osorno, I had friends from this part of the planet and very good people I knew at Comodoro Rivadavia.
I come following this forum about the DACs (TDA 16bit) i just discover last week because i got a CD player with 1541 and look for some improvement in the peformance and found this monster blog. I made one DAC no oversampling 11years ago with four 1543 with receiver 8411 i guess, the circuit worked marvellous but i abandon for get more complex and modern ones. I started to read fast at the beginning but after two days I discover that this blog is an eternal source and fountain of wisdom, for this reason I restarted to read more carefully and become more tempting to re see or better, try to build one. I noted amazed in your pics the corner horn because i like full range speakers and horns.
Receive my regards from Spain compadre
Esteban Bikic
dady@comodoro.com
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Old 11th December 2011, 09:40 AM   #4065
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hi dady,

Quote:
Do you have the whole project, schematics, pcb or at last pcbs for sale? Thanks in advance for your generosity. Esteban Bikic
The latest DAC module is the TDA1541A-MK8 with a single TDA1541A(S2). I posted concept schematics on this thread.

Power supply module still needs to be designed. I am currently testing pre-filtered common mode power supplies.
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Old 11th December 2011, 12:18 PM   #4066
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Hi Greg Stewart,

Quote:
Now after all that flattery, a quick question... I get that you don't select any of the components by 'accident'. But did you compare the Cornell-Dubilier acrylic SMD film caps to any of the other ones available like the Panasonic PPS?
The components are selected for a specific application. Their effectiveness is verified by both measurements and extensive listening tests.

Quote:
Also, what were the best type of ceramics that you found for PS bypassing and can you say more about the issues you saw with them?
This depends on the application and there is no simple answer to it. I experienced problems with too high Q factor (NPO), piezoelectric effects and poor mechanical strength (caps often break in half when exposed to slightest mechanical stress).
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Old 11th December 2011, 07:57 PM   #4067
dady is offline dady  Argentina
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Default I just reading the whole information of this blog and...

Quote:
Originally Posted by -ecdesigns- View Post
hi dady,



The latest DAC module is the TDA1541A-MK8 with a single TDA1541A(S2). I posted concept schematics on this thread.

Power supply module still needs to be designed. I am currently testing pre-filtered common mode power supplies.
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Old 11th December 2011, 08:09 PM   #4068
dady is offline dady  Argentina
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Default I just reading the whole information of this blog and...

Quote:
Originally Posted by -ecdesigns- View Post
hi dady,



The latest DAC module is the TDA1541A-MK8 with a single TDA1541A(S2). I posted concept schematics on this thread.

Power supply module still needs to be designed. I am currently testing pre-filtered common mode power supplies.
I started for the beginning (Always I must do that) Becoming more and more shocked for the project I abandoned nine years ago when I build a DAC with four TDA1543 and never listen again. After the page of this (the yours) if I remember near the seventieth one, you confessed that the another and more simple DAC sound better. Anyway this forum is for me a fountain of wisdom and knowledge, more than i can hold with my own capacity but anyway a challenge for learn a little bit more.
Please Sir if is possible to counsel about a paper for understand better DACs with the proposal of understand more deeply the title maybe must say "DAC for idiots in 24 lessons"
Thanks for your reply.
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Old 12th December 2011, 09:36 AM   #4069
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Quote:
Hi Maxlorenz.
I see you live on Osorno, I had friends from this part of the planet and very good people I knew at Comodoro Rivadavia.
I come following this forum about the DACs (TDA 16bit) i just discover last week because i got a CD player with 1541 and look for some improvement in the peformance and found this monster blog. I made one DAC no oversampling 11years ago with four 1543 with receiver 8411 i guess, the circuit worked marvellous but i abandon for get more complex and modern ones. I started to read fast at the beginning but after two days I discover that this blog is an eternal source and fountain of wisdom, for this reason I restarted to read more carefully and become more tempting to re see or better, try to build one. I noted amazed in your pics the corner horn because i like full range speakers and horns.
Receive my regards from Spain compadre
Esteban Bikic
Welcome dear Esteban,

Yes the speaker enclosures are the wonderful Tannoy Autographs from the 50's but the transducers are not real Tannoy but (spanish) Beyma 15"coaxials. I love them but they took me 4 months of my life to build them. I have a thread here with its story. I have the plans if you wish to: many members asked for them but no one reported back... The apparently also excellent P-Audio 15"coaxials are good replacement parts.
IMHO, horns are for classical music followers: never mind flatness of frequency response but look for speed or dynamics. My 10 year old child wanted a system for his room so I used USD30 tinny "surround" speakers that were lying there unused plus a trio of tubes (for an acoustic treatment project which name I forgot) and I installed them in a rear horn loaded bass:


https://picasaweb.google.com/lh/phot...eat=directlink

https://picasaweb.google.com/lh/phot...eat=directlink

I kept them and lent my bookshelf to my son. Of course they are not perfect but they make sound instruments like real, even double basses. I will perfect the project with fullrangers and an exponential horn built from plywood.

I have 5 or 6 of John's DACs and I love them. The multiDAC chip DACs are god for party/jazz, having fuller warmer bass/midbass and the one DAC latest versions are cleaner and more defined, excellent for classical, though I have not yet the MK8 for which I am saving my pennies.
I abandoned the 4x4 DAC for power issues but I am considering it again as a passive and balanced out DAC, but I need to buy a scope for that.
The DIY honeycomb resistors are truly amazing. These DACs sound better the fewer the parts involved.

Good luck,
M.

Last edited by maxlorenz; 12th December 2011 at 09:39 AM.
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Old 14th December 2011, 03:15 PM   #4070
dady is offline dady  Argentina
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Default Hi Maxlorenz

Thanks for your reply, Amazing horns, I just travelled for your blog and I will investigate for make one pair of them, I made at the end of 2005 (I need for glue them two month and half) one pair of horns, the cuts were so critic and they were make for a professional carpenter and I put a full range eight inches in and they are my favourites speakers. About the DACs maybe you have anything for sale, please tell me. You can email me in Castillan better to my address: dady@comodoro.com
I like opera and jazz to and valves amps and I will be glad in hear about you in Our predilection language.
To the rest of the fellows of the post my sincerely great salutations for the Christmas time with families and beloved people.
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