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DIY TDA1541A PCB "D3"

Would you like a through hole version of the D3?

  • Yes

    Votes: 12 52.2%

  • Maybe, depends on the performance

    Votes: 11 47.8%
  • Total voters
    23
  • Poll closed .
Jump to Latest
sthcoaster

sthcoaster

Member
Joined 2016
Paid Member
ryanj said:
Hi,

Thanks.

My current output stage is the CEN passive IV, which ive been using for a while now.

The 26V supply is fed by a capacitance multiplier using darlingtons in both the negative and positive lines. Attached schematic is similar to what im using right now. R2 was just to simulate the load.

For the +5V supply im using ecdesigns "charge transfer supply".
Click to expand...

What spec transformer in 26v supply?
 
P

ppap64

Member
Joined 2010
Hi Ryan, I have placed my order for the DAC boards.
Thank you for the psu info.
After searching the floating supply a bit, it seems we need a transf. w/ 2 x 24V second., BD679 for Q1 & Q2, BD680 for Q3 & Q4.
MBRS360 is obsolete, but MBR360G is available.
But, could you share the part #'s for L1, L2 100mH & L3, L4 470uH chokes ?
Thank you again.
 
T

tomtest

Member
Joined 2018
ppap64 said:
Hi Ryan, I have placed my order for the DAC boards.
Thank you for the psu info.
After searching the floating supply a bit, it seems we need a transf. w/ 2 x 24V second., BD679 for Q1 & Q2, BD680 for Q3 & Q4.
MBRS360 is obsolete, but MBR360G is available.
But, could you share the part #'s for L1, L2 100mH & L3, L4 470uH chokes ?
Thank you again.
Click to expand...

Hi ppap64,

normaly I would say 2x24V for a 26V power supply like the UltraBib is ok!

But my findings in the LtSpice simulation and the new circuit picture from Ryan shows 2x34V are correct. (Ryan please correct me if I am writing something stupid ;) )

Ryans suggestions for L you could find in the D2 thread:
Distinction-1541 v2 complete PCB interest list

or directly for L=100mH:
1140-153K-RC Bourns Inc. | Inductors, Coils, Chokes | DigiKey

Hope this helps!?

Building and struggling with the same problems. ;)

If someone out there have build a working circuit of this or at best have made a working PCB out of it:
It would be very kind of you if you could share this with us!!!:lickface:

Greetings to all and good luck with your build!
André
 
B

Ben Mah

Member
Joined 2012
Paid Member
BOM R22 R29

Hi Ryan,

There is a small discrepancy in the BOM.

R22 and R29 are listed together but the quantity is 1. Then R29 is specified again further down the list.

It seems that R29 was included with R22 in error. R22 and R29 are both 10R but are different types.

So it would appear that the quantity (1) of WSC452710R00FEA is correct but the inclusion of R29 with R22 is not.
 
R

ryanj

Member
Joined 2010
Current bid for populated test pcb.

Current Bid is $180 by acccruz

Post your bids on this thread.

ryanj said:
I will offer the final test PCB up for sale (without 1541A chip), if your interested please send me your bid.

Starting bid will be $169 AUD (Cost of parts+PCB). Postage cost will be calculated for the winning bidder.

I will accept bids until 15th July.

Happy bidding!

Ryan
Click to expand...
 
R

ryanj

Member
Joined 2010
Ben Mah said:
Hi Ryan,

There is a small discrepancy in the BOM.

R22 and R29 are listed together but the quantity is 1. Then R29 is specified again further down the list.

It seems that R29 was included with R22 in error. R22 and R29 are both 10R but are different types.

So it would appear that the quantity (1) of WSC452710R00FEA is correct but the inclusion of R29 with R22 is not.
Click to expand...
Thanks for pointing that out. I'll fix it up.
 
B

Ben Mah

Member
Joined 2012
Paid Member
ryanj said:
Hi,

The 26V supply is fed by a capacitance multiplier using darlingtons in both the negative and positive lines. Attached schematic is similar to what im using right now. R2 was just to simulate the load.
Click to expand...

I will be repurposing the supplies in my existing dac.

I see that your simulated load is 200R. Is the expected maximum current draw of the 26V supply 130mA?
 
B

Ben Mah

Member
Joined 2012
Paid Member
ryanj said:
Ben mah,

The darlingtons do most of the heavy lifting in this circuit so you could omit the inductors and just use an RC after the darlingtons instead. You could adjust R to get the voltage needed.
Click to expand...

It wasn't me who was asking about the inductors. It was ppap64.

I am planning to reuse the -15V supply of my existing dac. It is floating with CRCRC in both legs followed by LM317 voltage regulator in the positive leg, followed by C, then LM317 ccs in the negative leg, followed by inductors and ferrite cores in both legs, then TL431 voltage regulator, ending with C. I have enough AC voltage. I just need to adjust some resistor values to end with 26V.

The last part is similar to your design of the local TDA supplies. Is it ok to have the ccs and TL431 in the 26V supply feeding the local supplies with ccs and TL431?
 
R

ryanj

Member
Joined 2010
karahana said:
Hi! Does it make sense to use multiple boards? And how actually does it sound? I was looking for a 1541 project and run into this thread. I understand it is connected to another huge thread (ultimate nos dac tda1541a). I have no chance to read it even briefly.
Am i on time to order pcbs?
Click to expand...

Yes you can still order a PCB, I have a few left.

Do you mean you want to run in parallel?

How does it sound - well I love it, but any listening impression is subjective, and im guessing everyone is going to get different results based on the synergy of their sound system. In the end you'd just have to try it out to see if you like it or not.
 
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