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DIY TDA1541A PCB "D3"
DIY TDA1541A PCB "D3"
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Old 31st January 2021, 08:05 PM   #901
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by androa76 View Post
Understand. Do you have any recommendation for silvered ufl cables for connection data lines? Thank you.
Hi androa76,

I suppose you mean tinned at one end, with the other end terminated with a ufl plug?
Buying two long ufl cables and cutting them in half you could make your own. I have not tried this but should work fine.
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Old 17th February 2021, 04:56 PM   #902
simon dart is offline simon dart  United Kingdom
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Default Tube I/V?

Soooo late to this party but I'll be building up my D3 soon.

I'm drawn to Thortstens ECC88 I/V for my build Thorsten's tube Stage for TDA1541A but I know nothing of the subtleties of tube circuits.

I'd like to try choke loading the anode as he suggests. I guess the standing current is the important thing to aim for here and the higher the inductance the better? Would a Llundhal L1667 fit the bill? Its 270H and 15mA.

Grateful for any advice. Thanks!
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Old 11th March 2021, 12:51 PM   #903
3kes is offline 3kes  Netherlands
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Join Date: Mar 2018
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Probably a very stupid question but I can't figure it out.

I see D3 setups with Ian's Fifopi directly to the D3 board and setups with the I2S to simultaneous converter board between the Fifopi and D3 board.

What is the benefit or downside of the setups?

Thanks!
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Old 14th March 2021, 03:24 AM   #904
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by 3kes View Post
Probably a very stupid question but I can't figure it out.

I see D3 setups with Ian's Fifopi directly to the D3 board and setups with the I2S to simultaneous converter board between the Fifopi and D3 board.

What is the benefit or downside of the setups?

Thanks!
Hi 3kes,

Simultaneous mode in my experience is a much more enjoyable listening experience with the TDA1541A. The sterreo imaging is much more refined and accurate, I also noticed an improvement in the accuracy of the bass.
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Old 17th March 2021, 09:59 PM   #905
asanden is offline asanden  Netherlands
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Join Date: Apr 2015
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Default JLsounds Question

I finally had some time to finish my D3 build, look forward to it. But I run into a no sound issue... I suspect it is on the V1 i2s sim board.

My setup is:
RPI4 + Moode Audio (USB setting) (files play ok)
>>
JLSounds V3; USB>I2S internal clock (internal clock, TDA1541A in I2S mode in 32-bit frame; jumpers on J2, J4 A2, B1, B3 closed) 32 bit means stereo I guess!
Dual external power supply setup
>>
Ryan’s V1 board (I2S > Sim)
>>
Ryan’s D3 board (in J2 simultaneous setting)
>> I/V 50R resistor for the moment

No shorts and such on the UF/L lines.

The D3 has correct power and I can get 0mV on the AOL / AOR once the RPI starts playing a song.

For those familiar with the jlsounds; Is the jlsounds jumper setting correct?, the 32 bit refers to 2x16 stereo channels I guess...

Next step would be troubleshooting the V1 board

Regards, Albert
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Old 19th March 2021, 01:46 PM   #906
asanden is offline asanden  Netherlands
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Join Date: Apr 2015
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Follow up on previous post.
Jlsounds needed the standard I2S setup (only B1 and B3), I2S SIM V1, D3 all ok
Very good sound on this test setup
Hear some cracks on some 16 bits sample rates, but ie 176k/16 plays fine
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File Type: jpeg E0D9CBEF-188A-4EA8-802B-A4631B815047.jpeg (555.0 KB, 202 views)
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Old 19th March 2021, 08:53 PM   #907
androa76 is offline androa76  Slovenia
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At the moment I have very little time because of 3 month old child, so i have to optimize my time. I am very sorry if this was already explained, i found some info but i am not sure if i explained it right to myselfe. I soldered my boards, connected them to 2 lifepo power supply, so 25,2V and 8,4V followed by tps7a4700 set to 5v. I measured voltages in expected region, just dc offset can not be set to 0V and i can"t measure any output signal with 50r i/v resistor. Here is my work. For the test i use piece of wood, later if sound will be promissing it wil be mounted into alu enclosure. Maybe some mistakes are vissible? I know, i should"t use S1 for testing but, i get A dac in one week and can"t wait another week .
Attached Images
File Type: jpg Inputd3.jpg (429.0 KB, 193 views)
File Type: jpg d3 2p.jpg (951.1 KB, 183 views)
File Type: jpg d3 all.jpg (902.3 KB, 176 views)

Last edited by androa76; 19th March 2021 at 08:56 PM.
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Old 21st March 2021, 02:01 AM   #908
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by asanden View Post
Follow up on previous post.
Jlsounds needed the standard I2S setup (only B1 and B3), I2S SIM V1, D3 all ok
Very good sound on this test setup
Hear some cracks on some 16 bits sample rates, but ie 176k/16 plays fine
Glad you got it all working. Are the cracks over 176k?
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Old 21st March 2021, 02:03 AM   #909
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by androa76 View Post
At the moment I have very little time because of 3 month old child, so i have to optimize my time. I am very sorry if this was already explained, i found some info but i am not sure if i explained it right to myselfe. I soldered my boards, connected them to 2 lifepo power supply, so 25,2V and 8,4V followed by tps7a4700 set to 5v. I measured voltages in expected region, just dc offset can not be set to 0V and i can"t measure any output signal with 50r i/v resistor. Here is my work. For the test i use piece of wood, later if sound will be promissing it wil be mounted into alu enclosure. Maybe some mistakes are vissible? I know, i should"t use S1 for testing but, i get A dac in one week and can"t wait another week .
Is the 25.2V battery supply floating? its not referenced to ground?

You may also need music playing to get 0V on the outputs.

Last edited by ryanj; 21st March 2021 at 02:06 AM.
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Old 21st March 2021, 04:39 AM   #910
androa76 is offline androa76  Slovenia
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Changed the tda1541 and dac works. I got damaged dac. Voltages on oscilator are at damaged dac around -14.5v on working dac -11.4. And on Decou capacitors only around -0.45v not more. Next...output stage.
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