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DIY TDA1541A PCB "D3"
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Old 16th July 2019, 09:39 AM   #131
ryanj is offline ryanj  Australia
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Old 16th July 2019, 09:57 AM   #132
bisesik is offline bisesik  Kazakhstan
Output transformers for DACs
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DIY TDA1541A PCB "D3"
Hi Ryan! Can you say, is it possible to avoid the current offset elements (TR1\C56\R32 and TR2\C57\R33) if to use your boards in differential mode with transformers?
I mean the following connection:

Differential output.png

Have you tried that or not? Thank you!

BR, Ivan
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Old 16th July 2019, 10:19 AM   #133
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by bisesik View Post
Hi Ryan! Can you say, is it possible to avoid the current offset elements (TR1\C56\R32 and TR2\C57\R33) if to use your boards in differential mode with transformers?
I mean the following connection:

Attachment 768589

Have you tried that or not? Thank you!

BR, Ivan
Hi,

No I havnt tried using a transformer for my output stage. I believe Batteryman and Koldby have had experience with transformers, they would be able to give you some advice.

I'd say it would depend on the resistance of the coils. I've found that having DC on AOL and AOR has a negative impact on the SQ, but this is using the CEN passive IV, so it may have a different impact. Not sure. Sorry im not much help.
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Old 16th July 2019, 10:25 AM   #134
bisesik is offline bisesik  Kazakhstan
Output transformers for DACs
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DIY TDA1541A PCB "D3"
Anyway thank you Ryan! Hope Batteryman or Koldby can tell more...
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Old 16th July 2019, 10:27 AM   #135
ryanj is offline ryanj  Australia
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Batteryman talks about it here -feed the current into the CT

And here

Last edited by ryanj; 16th July 2019 at 10:31 AM.
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Old 16th July 2019, 05:11 PM   #136
Ben Mah is offline Ben Mah  Canada
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Quote:
Originally Posted by ryanj View Post
All PCBs have been posted.
Thank you, Ryan.

Time to order some parts. Those 22uF acrylic metallized capacitors (C6, C14, C20) sure are pricey:

16MU226MD35750 Rubycon | Capacitors | DigiKey

And only available at Digi-Key, not stocked by Mouser.
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Old 17th July 2019, 08:55 AM   #137
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by Ben Mah View Post
Thank you, Ryan.

Time to order some parts. Those 22uF acrylic metallized capacitors (C6, C14, C20) sure are pricey:

16MU226MD35750 Rubycon | Capacitors | DigiKey

And only available at Digi-Key, not stocked by Mouser.
Yes they are, but they are worth every cent. I tried using different caps but didn't get anywhere near the same SQ.
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Old 17th July 2019, 09:22 AM   #138
pistollero is offline pistollero  Portugal
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Hello , can someone tell the total price of the bom?
Thks
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Old 17th July 2019, 10:15 AM   #139
ryanj is offline ryanj  Australia
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Total cost of BOM is $155 AUD
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Old 17th July 2019, 12:43 PM   #140
Ben Mah is offline Ben Mah  Canada
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When I order components I usually order extras, especially for the smaller sized smd components. The smaller sized resistors and capacitors can be easily lost so spares are handy. It saves on reordering time and shipping cost for orders of less than $100 if buying from Digi-Key or Mouser.

I will not be ordering extra C4 C14 C20 though. They are big enough so I will be able to see them if I drop them. And I will be ordering the Ryan recommended Rubycons.

So for me the BOM cost will be a bit more to account for possible component loss due to my clumsiness or poor soldering technique.

Although for the components that are required in quantities of seven or eight, it may not cost any more to buy 10, so the spares are free.
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