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Old 13th September 2012, 06:39 AM   #281
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Hi Bunpei,

- thanks for posting and giving this link but I don't understand what it says

Google translate gives me a hint about it but not to an extent that it is becomes "usable" ...

But in another thread - I think it was on the SDtrans384 - I noticed that you mentioned a LPF filter (LCR) you made for this device. I reckon it's basically enough to know the output impedance of the sending end (the I2S output impedance) and the receiving end and then calculate the values of L, C or R needed, right?

Will get back to you later on email

Jesper
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Old 13th September 2012, 11:55 AM   #282
NicMac is offline NicMac  Italy
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Ok. Back on topic
Found something in my incoming post today........
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File Type: jpg amanero.jpg (46.2 KB, 678 views)
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Old 13th September 2012, 12:00 PM   #283
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by Bunpei View Post
A Japanese user made a very simple
discrete direct DSD/analog converter (in Japanese) with using one chip device.
Click the image to open in full size.
Bunpei,
Do you know what is the device in the picture?
Looks pretty identical to the amanero board.................
Cheers,
Nic
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Old 13th September 2012, 12:09 PM   #284
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Quote:
Originally Posted by NicMac View Post
Bunpei,
Do you know what is the device in the picture?
Looks pretty identical to the amanero board.................
Cheers,
Nic
Hi ... Bunpei probably knows for sure ... but amanero pops up from time to time in the google translated text on link he gave ...

Regards,

Jesper
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Old 13th September 2012, 12:53 PM   #285
NicMac is offline NicMac  Italy
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From the thread in japanese it looks like he tested various types of USB VBUS decoupling. I wonder what he concluded and what worked best
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Old 13th September 2012, 02:35 PM   #286
Bunpei is offline Bunpei  Japan
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Hi, gentlevoice and NicMac,

I should have clarified that "the board was amanero and he connected his own discrete direct DSD/analog converter to the DSD output terminals on the board".

To gentlevoice
Your guess was correct. His converter is a single resister of 1k ohm as a LPF.
I believe it is far more simple, less expensive, feasible and reproducible than the complicated one appeared in a dRaydream.

To NicMac
His conclusion was that "the aggregation of all" matched his taste the best.
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Old 13th September 2012, 03:12 PM   #287
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Quote:
Originally Posted by Bunpei View Post
I believe it is far more simple, less expensive, feasible and reproducible than the complicated one appeared in a dRaydream.
you might sleep for a hundred years when you have read about all the dRayDream´s

Last edited by RayCtech; 13th September 2012 at 03:34 PM.
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Old 13th September 2012, 05:23 PM   #288
qusp is offline qusp  Australia
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doesnt really sound like the DSD direct filter is ..you you say....'optimal'?

then again it was hard going even with chrome translator, it did seem to be a theme among thos he tried with the LPF compared to using ESS DSD mode
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Old 13th September 2012, 10:31 PM   #289
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by RayCtech View Post
you might sleep for a hundred years when you have read about all the dRayDream´s
Don't even care to read about it
Usual esoteric overshoot stuff aimed at ripping people of without any measurable/audible benefit. Wired with gold wire I assume.......
I much prefer a single 1k resistor solution.
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Old 14th September 2012, 12:10 AM   #290
qusp is offline qusp  Australia
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i'm not discouraged, part of the reason I got this thing was to experiment with direct out, maybe not just a single resistor though...... with the USB board being usb powered this would mean USB ground passed right through… thats what you call terrible PSRR

hey maybe a high bandwidth transformer could be used as filter and isolate the output ground.

but a few extra parts and perhaps battery psu it could be winning

think i'll skip the blurb too...

Last edited by qusp; 14th September 2012 at 12:15 AM.
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