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CM6631A + ES9023 cheap board - modification...?
CM6631A + ES9023 cheap board - modification...?
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Old 14th March 2019, 09:19 PM   #61
phase is offline phase  United States
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Join Date: Oct 2004
I usually let them play for about 12 hours, then shut them down for 12, do that for a couple weeks or so at least. The last ones took around 7 weeks, as they (polystyrene) didn’t have much voltage or current going through them.
Sounds crazy, and if you’d told me that a few years ago, I would have had some serious doubts!
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Old 15th March 2019, 05:51 AM   #62
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by phase View Post
I usually let them play for about 12 hours, then shut them down for 12, do that for a couple weeks or so at least. The last ones took around 7 weeks, as they (polystyrene) didn’t have much voltage or current going through them.
Sounds crazy, and if you’d told me that a few years ago, I would have had some serious doubts!
yes yes...switch on for some couple of hours and off!!...
i am really happy with the sound...rally not bad for the money
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Old 16th March 2019, 08:27 PM   #63
chermann is offline chermann  Austria
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Join Date: Jan 2017
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Default Vreg 180k 3,3V...

Hi


i push from a file...315hz into the DAC and check what is the max level with 3,3V setting and the 180kR resistor on Vreg.
see the pic 1,86Vrms max level of output

but i thought 3,3V is AVCC / 2 = 1,65V???



to late i found at foobar the function for a tone generator:
under file/ADD location you can enter e.g. tone://1000,20 = 1khz with 20seconds




chris
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File Type: jpg output voltage at 3,3 with 180kR.jpg (90.4 KB, 28 views)

Last edited by chermann; 16th March 2019 at 08:34 PM.
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Old Yesterday, 08:48 PM   #64
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Default next modification borad1

Good evening


after some compare session with my unmod D50 i decided to do the next step with changing the caps near the crystals. these are decoupling caps and Samwah 470µ/25V. i measure that (LCR Meter) and they are not bad up to 10kHz, 10khz not so fine...so i think they are good for "supplies". i need "lower ESRcaps"

the only caps at home are and i think 80µF are sufficient :
rubycon 47µ/50V 50YXM47MEFc6.3x11
Panasonic 33µF/35V EEU-FM1V330

What did i miss? compared to D50 i miss more mirco details and a correct bass area. some voices (e,g. "t" are to hard and were more shouted not sang)

on the pic you can see in the top right corner the bigger ruby..the pana are at the bottom side of the pcb.
why so small caps?...for the final DAC--> with alu case i have to be careful about the size of the cap.

Thanks to" José James / no Beginning no End" i had a nice listening evening ( as specially title 5,8,12 for compare mostly)

will hear after some hours what happened...actually its playing at this update 2 hours and i am happy..the sounds stage is not as big as the D50 and the smartness is not evident but the micro details start to shine a bit more.



chris
Attached Images
File Type: jpg 9023 modification_variant_1_1.jpg (430.3 KB, 9 views)
File Type: jpg 9023 modification_variant_1_2caps.jpg (367.2 KB, 9 views)

Last edited by chermann; Yesterday at 08:51 PM.
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Old Yesterday, 09:01 PM   #65
chermann is offline chermann  Austria
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Join Date: Jan 2017
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oh...i forgot the album "never ending January" title 1,3 Espen Erikson Trio for compare...
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