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SD Card Memory FLAC/WAV 192/24 player - ESS crescendo II - AK4495 - DV20A
SD Card Memory FLAC/WAV 192/24 player - ESS crescendo II - AK4495 - DV20A
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Old 4th April 2018, 09:12 PM   #11
Extreme_Boky is offline Extreme_Boky
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It is.
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Old 4th April 2018, 11:25 PM   #12
phase is offline phase  United States
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Sure looks like it to me!
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Old 5th April 2018, 10:09 AM   #13
acidbrain is offline acidbrain  Netherlands
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SD Card Memory FLAC/WAV 192/24 player - ESS crescendo II - AK4495 - DV20A
thanks for the advice.
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Old 6th April 2018, 08:42 AM   #14
pistollero is offline pistollero  Portugal
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Does anyone know if the volume control is the digital volume of akm chip?
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Old 6th April 2018, 03:17 PM   #15
acidbrain is offline acidbrain  Netherlands
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SD Card Memory FLAC/WAV 192/24 player - ESS crescendo II - AK4495 - DV20A
Finally Weiliang released ak4495+ak4118 dac today.
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Old 23rd April 2018, 02:39 PM   #16
acidbrain is offline acidbrain  Netherlands
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SD Card Memory FLAC/WAV 192/24 player - ESS crescendo II - AK4495 - DV20A
Okay , first thing that i wanted to do was to split up de powersupply for the opamp.
The double voltage 15/0/-15 was rectified using one bridge.
The 0 wire was connected inside the transformator with the other secundairy windings.
Using just 3 wires gave a loud hum coming from the transformer.
I had to cut the trafo open to make 4 wires for the double rectifier.

I then removed the two regulators, LM317 & LM 337 and surrounding caps + resistors.
Changed them for 2 NEWclassD regulators i had laying around.
Removed the 2x "Elna for audio" 4700uF caps for 2x Nichicon KZ 1000uF
I also made a new rectifier with 8 Schottky diodes, the existing diodes were also Schottky's.
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File Type: jpg IMAG3255.jpg (437.4 KB, 240 views)

Last edited by acidbrain; 23rd April 2018 at 02:52 PM.
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Old 23rd April 2018, 03:15 PM   #17
acidbrain is offline acidbrain  Netherlands
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SD Card Memory FLAC/WAV 192/24 player - ESS crescendo II - AK4495 - DV20A
Here a picture with the 2 regulators on the right, i also changed the Wima filmcaps surrounding the Muse8820 for my favourite filmcaps.
I don't know if the capacitors are genuine or not, changed them to be sure of it.
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Old 24th April 2018, 03:26 PM   #18
acidbrain is offline acidbrain  Netherlands
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SD Card Memory FLAC/WAV 192/24 player - ESS crescendo II - AK4495 - DV20A
With this newer model DAC is the powersupply for the USB/Sd card /display etc. moved to it's own board. The DAC board itself remained unchanged, only without parts. So I cut the board up to make room for 2 trafo's to make 4 powersupply's.
The last picture is of a later date, there i allready changed all the elco's surrounding the AK4495 for real? Silmic 2 and Panasonic FM.
I also moved the main switch away from the rectifier, too close, it became unsafe.
Funny thing about that switch, it was placed between the 2 primairy 115V coils. That gave some problems when installing my own trannies
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File Type: jpg IMAG3237[1].jpg (493.9 KB, 211 views)
File Type: jpg IMAG3260[1].jpg (350.5 KB, 75 views)
File Type: jpg IMAG3315[1].jpg (462.7 KB, 74 views)

Last edited by acidbrain; 24th April 2018 at 03:38 PM.
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Old 24th April 2018, 04:06 PM   #19
acidbrain is offline acidbrain  Netherlands
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SD Card Memory FLAC/WAV 192/24 player - ESS crescendo II - AK4495 - DV20A
The stock transformer delivers 8V/1A to the I/O board and 2x 15V ?A to the DAC itself. There only the negative side is used to feed the MUSE8820. The positive side is also used for the opamp AND to feed 2 LM2941 regulators.

The LM2941 one the right powers VDD/L/R and VREF/L/R, the other regulator powers DVDD and AVDD. I wanted to split that up, the original supply is now only used for the opamp.
With my 2 new trannies i can make 4 power supplies. One NewclassD reg for VDD/L/R at 6.9V, a TPS7A4701 based reg for VREF/L/R also at 6.9V.
In the pictures you can see where i cut the lines.

TPS7A4701 Low Noise RF LDO Regulator Power Supply Module 1.5V-34V 3.3V 5V 12V 1A | eBay
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File Type: jpg IMAG3271[1].jpg (850.7 KB, 69 views)
File Type: jpg IMAG3273[1].jpg (318.1 KB, 40 views)
File Type: jpg IMAG3332[1].jpg (504.1 KB, 50 views)

Last edited by acidbrain; 24th April 2018 at 04:16 PM.
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Old 25th April 2018, 02:33 PM   #20
acidbrain is offline acidbrain  Netherlands
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SD Card Memory FLAC/WAV 192/24 player - ESS crescendo II - AK4495 - DV20A
Another TPS7A4701 reg at 5.25V was placed in the small space left. That one powers a Twisted Pear AVCC reg with 2x3.6V output. Those outputs feeds the DVDD and AVDD of the AK4495 chip. Luckily the sound improves with every change, better image, cleaner sound, but maybe a little too bright.

-As mentioned before on other threads, you can easily cut the single powersupply for analog and digital up by removing the 2 ferrite coils on the board.
- I tried the 2 big capacitors on VREF/L/R, the sound got gloomy and slow. I currently use only 2 Wima 6.8uF filmcaps.
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Last edited by acidbrain; 25th April 2018 at 02:57 PM.
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