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QA-550 SD card 16/44.1 WAV transport
QA-550 SD card 16/44.1 WAV transport
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Old 23rd June 2015, 03:28 PM   #321
gadut is offline gadut  Indonesia
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QA-550 SD card 16/44.1 WAV transport
you can find this lcd easily on ebay, it's cheap. just use keyword "lcd 16x2". or you can find it from your local store which usually sell arduino related items.

I got it from here on my local store, which i'm sure it's the same item listed on ebay JUAL LCD 16x2 Backlight Biru MURAH - UjungSolder
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Old 23rd June 2015, 03:53 PM   #322
maxlorenz is offline maxlorenz  Chile
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Thank you.
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Old 2nd August 2015, 04:27 PM   #323
maxlorenz is offline maxlorenz  Chile
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Dear Gadut,

I am a nullity.

I cannot source the cable-set for the connection of the big LCD screen, which, by contrast, is very easy to source, as you said.
I need a little help.

Appart, I upgraded the clock and it made a significant improvement. Now the red Wima seems to be fully burnt-in...at last.

Cheers,
M.
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Old 3rd August 2015, 02:57 PM   #324
gadut is offline gadut  Indonesia
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QA-550 SD card 16/44.1 WAV transport
try to google "40pin header rainbow", below sample from my local webstore:
https://m.tokopedia.com/ujungsolder/...in-male-female
https://m.tokopedia.com/ujungsolder/...le-tulang-ikan

i put aditional resistor 1k5 on pin 3 V0 to reduce contrast, use some oscon sg 47uf and bg pk, clock to tentlabs.

got lcd 40x2 from ebay, it' huge. i'm expecting to get a new firmware for this displayed, but qls reply " Sorry, This product has been discontinued for a long time, and the original code design staff has been replaced " so 16x2 is the maximum display you can get, most important thing is to keep this player to work as long as possible
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Last edited by gadut; 3rd August 2015 at 03:10 PM.
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Old 4th August 2015, 01:39 AM   #325
maxlorenz is offline maxlorenz  Chile
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Thanks a lot.
Very useful info.

M.
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Old 9th November 2015, 08:05 AM   #326
arivel is offline arivel  Italy
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Hello to all.
sorry my English.
after reading these pages I decided to get hold of the QA550.
I would like to make some changes to improve.
use I2S, SPDIF remove chips, make new power with LT3080, new synchronous clock and reclocking.
The most difficult thing for me is to replace the clock and use synchronous I2S.
I saw what he did EUVL and I would do it myself but I have not figured out how to do it.
anyone can help me ?
bye thank you
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Old 1st May 2019, 05:14 PM   #327
EUVL is offline EUVL  Europe
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Someone dug out this thread and asked me what I changed on the original.

The simple answer is nothing, other than remove the XO.
The XO is placed near the ES9023 and then fed back to the QA using the MCLK pin of the I2S.

And yes, sounds really gorgious.
But that of course also depends on your DAC.


Cheers,
Patrick
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