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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
A story of mysterious interaction between a diy tda1543 dac setup and the human body.
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Old 19th March 2018, 01:13 PM   #11
Bartb is offline Bartb  Slovenia
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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
Hello Abraxalito,
Do you know maybe how many parallel TDA1543s (I2S) I can drive with one 74HC125 buffer? I've seen a maximum of 12x TDA1543 in online designs. I checked the data sheets, don't want to guess on this..
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Old 19th March 2018, 03:44 PM   #12
abraxalito is offline abraxalito  United Kingdom
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I didn't know the answer, had to look it up. Its at least 100 in practice - though that's not guaranteed, just a typical at 25oC. If you want the ultra-conservative 100% guaranteed figure, its 35.

The data you need (in particular the buffer's output drive characteristics) isn't shown in the Nexperia 74HC125 datasheet, its in the HC/HCT user guide.
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Old 19th March 2018, 06:07 PM   #13
Bartb is offline Bartb  Slovenia
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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
Thanks for checking that out. This surely simplifies the design in case I go with 32xTDA1543.
( DDDAC 2000 says a good balance between improvements and power consumption is 60x but I definitively want to stay lower )
To date I've made a 16x TDA1543 and I am very happy with the sound. It has a punch and consistence that I like very much. Somewhere I read this chip's sound (with passive i/v) is addictive... and I'm starting to believe that.
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Old 20th March 2018, 03:28 AM   #14
abraxalito is offline abraxalito  United Kingdom
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Yeah its addictive all right with passive I/V but goes up another level (think crack cocaine) with active I/V preceded by a fairly steep filter. Then you'll not need to use as many chips as 32. Have you tried TDA1543A incidentally? It has at least one problem on the older version fixed.
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Old 20th March 2018, 09:12 AM   #15
Bartb is offline Bartb  Slovenia
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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
Ahaaa I'll try the active setup as well then
It started as a car audio project, and I was attracted by the relatively simple setup.
I compared my 2cent dac (16xTDA1543) with the (acclaimed) DCT-Z1 Denon, the (respected) Pioneer DEX-P9R and the Shanling CD T-80 (tube-home), well... they're all headed to the dustbin,
No haven't tried the TDA1543A, what problem did they fix?
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Old 20th March 2018, 09:19 AM   #16
abraxalito is offline abraxalito  United Kingdom
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Best to let @Alexandre tell you himself about the issues with the non-A. I've played with the 'A' and definitely the sample update delay has been fixed.

Which budget USB DAC under 200USD
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Old 20th March 2018, 09:22 AM   #17
Bartb is offline Bartb  Slovenia
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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
Ahaa ok, I'll check that out. and what kind of active I/V were you suggesting ?
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Old 20th March 2018, 09:26 AM   #18
abraxalito is offline abraxalito  United Kingdom
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Single PNP transistor in common-base mode. DAC output goes to emitter, I/V resistor between collector and 0V. Base is fed from a reference voltage (TL431 works fine). Think I've posted up the schematic before trouble is I can never remember where...
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Old 20th March 2018, 09:35 AM   #19
Bartb is offline Bartb  Slovenia
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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
Ok thanks! I'll look that up as well. I'm in experimental mode
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Old 20th March 2018, 09:04 PM   #20
Bartb is offline Bartb  Slovenia
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A story of mysterious interaction between a diy tda1543 dac setup and the human body.
I think this is the post with schematic you were suggesting... fits the description
Please help: nOOb building a 9028 DAC
What happens if you feed pin 5 with +8V ?
How about adapting circuit for 16x parallel ? (it lowers distortion ?)

Last edited by Bartb; 20th March 2018 at 09:23 PM.
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