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Old 17th February 2015, 07:00 PM   #1
Green77 is offline Green77  Sweden
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Default Luckit wave io and tda1541

Hello all!

I bought a wave io card from luckit and will use the i2s signals to my tda1541 dac. Do i need to do the i2s attenuator mod? Or will it work if connect the 3 signals directly?

Regards // Daniel
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Old 17th February 2015, 07:17 PM   #2
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I have been using it as it is and it works perfectly. I have tried both direct and isolated outputs and both are fine. If using isolated output of wavIO you might want to use 3.3v (or whatever is the lowest acceptable voltage) for powering the isolators.
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Old 17th February 2015, 08:07 PM   #3
Green77 is offline Green77  Sweden
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Thanks. I will try it without the mod and use 3.3v to isolated i2s output.

Regards //Daniel
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Old 17th February 2015, 08:55 PM   #4
Green77 is offline Green77  Sweden
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One more thing, what is the advatige with the i2s attenuator mod?
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Old 17th February 2015, 09:57 PM   #5
Eldam is offline Eldam  France
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It's a tip by John to reduce the Jitter (lower voltage equal less jitter: my understanding).

You could also supply the isolator pin with the same external supply 5 VDC
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Old 26th February 2015, 03:42 PM   #6
Eldam is offline Eldam  France
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Ah, so with 5 V it's also ok as wrote, but not with the same PS than the Wav I/O one (because same ground = no isolation though it will work as the chip is feeded but will isolate nothing if taken from the Wave I/O 5V PS !).

I don't know if it's work for a value between 3.3 V and 5 V ?
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Old 26th February 2015, 06:20 PM   #7
Green77 is offline Green77  Sweden
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I tried the isolated I2S with 3.3v. Works, but the sound is really bright with lack of both bass and mid for me. I don't have any u.fl cables so i haven't tried the "normal" i2s..
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Old 26th February 2015, 07:26 PM   #8
Eldam is offline Eldam  France
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Ah you use the spidf input ! I just have been understanding.

It's a much better board for USB input !

With those old chips it's recall me what some good designer says about it with TDA1541... If you look at what Pedja Rogic can do with a CS8014 spidf chip... sounds good despite the say jitter (which is not so bad btw for the bass in relation too what you measure about the jitter here !). Some prefer the CS8014 (discontinued) with this chip than the DIR tou talked about ! I should source if you such a chip...or just the old chip, could be posssible to find the DIR...).

But If you talk about the usb input i have no particular problem with the board : sounds good ! Some prefer the non isolated side with the tda1541 but don't notice too much problems as you do.
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Old 27th February 2015, 03:40 AM   #9
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Quote:
Originally Posted by Green77 View Post
I tried the isolated I2S with 3.3v. Works, but the sound is really bright with lack of both bass and mid for me. I don't have any u.fl cables so i haven't tried the "normal" i2s..
You may want to try direct I2S too. Some find that the added jitter of isolated I2S could sound worse than dirty ground of direct I2S.
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Old 27th February 2015, 05:10 AM   #10
Green77 is offline Green77  Sweden
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Yes, i will do that. I haven't found any local company that hold u.fl cables, so i have order from eBay...
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