TDA1541A "piggybacking" on analog metric pcb? - Page 2 - diyAudio
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Old 11th May 2012, 11:39 AM   #11
Mayday is offline Mayday  Sweden
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If a moderator would change the topic to "Parallell TDA1541A's/Balanced+parallell TDA1541A's" I would be grateful. I'm no longer trying to piggyback the TDA's but rather trying to design a PCB with either 4xTDA1541A in parallell or in balanced(differntial)/paralllell(2+2).
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Old 12th May 2012, 03:43 PM   #12
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Spent about 2 more hours on this project today(in eagle).
It's comming along, but very slowly.
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Old 13th May 2012, 11:30 AM   #13
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I've created a number of parts in eagle now, DIR9001, SAA7220 and more to have options.
Once I got the hang of it it's quickly done.
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Old 13th May 2012, 11:16 PM   #14
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Hi Mayday
I am sure you have seen this, but there is a tremendous body of work on the ecdesigns thread where he explores multiple chips in parallel and then comes back to one with very careful design.
Building the ultimate NOS DAC using TDA1541A
It is a multi year journey with many of the tda experts weighing in. Long but a great source of research.
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Old 13th May 2012, 11:20 PM   #15
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Hi
I've started reading that thread, it's a long one.
I was thinking maybe a differential design with 2 tda's per channel.
Haven't really gotten very far though, this will be a long term project
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Old 15th May 2012, 02:08 AM   #16
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Meanwhile I hope you are still enjoying your 1541a masterpiece. Some of the areas that are worth consideration coverd by ecdesigns include:
DEM reclock is a winner.
Of course low noise discrete reg for each power consumer.
His bypass cap made of a double sided pcb. (brilliant) I cheated and used a silver mica to bypass Russian MGBO2 POI for coupling cap. Another winner that some claim beat a VCap for pennies.
SMT decoupling caps soldered direct to 1541a pins. Awesome.
My next thing is to build his double helix resistor for the passive I/V. No end to 1541a fun.
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Old 15th May 2012, 09:09 AM   #17
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Quote:
Originally Posted by wlowes View Post
Meanwhile I hope you are still enjoying your 1541a masterpiece. Some of the areas that are worth consideration coverd by ecdesigns include:
DEM reclock is a winner.
Of course low noise discrete reg for each power consumer.
His bypass cap made of a double sided pcb. (brilliant) I cheated and used a silver mica to bypass Russian MGBO2 POI for coupling cap. Another winner that some claim beat a VCap for pennies.
SMT decoupling caps soldered direct to 1541a pins. Awesome.
My next thing is to build his double helix resistor for the passive I/V. No end to 1541a fun.
I don't know if I'd call it a masterpiece
But I did put alot of thought into that build and used the best parts I could reasonably afford. I do enjoy it, the MayDac(as I call it) will stay for a very long time as my main D/A converter.
The project I'm tinkering on now is very long term, it's fun working in eagle and hopefully I'll get a nice design and layout in the end
I think a differential design with two TDA/channel, one for +out and one for -out might be a good way to use multiple TDA's?
1541A's are fun, and it's easy to get bitten by that bug since they are so grateful for mods/upgrades....you hear results when giving them better working conditions.

It would be difficult and expensive, but one dream of mine is to use 4 tda's as above and then after I/V connect the differential outputs of each channel to a signaltransformer for single ended outputs.
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Old 15th May 2012, 12:38 PM   #18
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This may help you

This is my release candidate board - a bit of silcscreen fixes, graphics, GND vias and pads for copper shields attatchment will make it 100%.

http://s3t.it/data/uploads/dac_1541_v011.png

Historical layouts from recent to where it started:
TDA1541A
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Old 15th May 2012, 12:40 PM   #19
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Thank you
I'll look at the links when I get home, on my cellphone now.
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Old 15th May 2012, 06:01 PM   #20
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Quote:
Originally Posted by s3tup View Post
This may help you

This is my release candidate board - a bit of silcscreen fixes, graphics, GND vias and pads for copper shields attatchment will make it 100%.

http://s3t.it/data/uploads/dac_1541_v011.png

Historical layouts from recent to where it started:
TDA1541A
You do really nice work!
Will you use a single TDA1541A?
Thanks for sharing
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