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DAC-END R (ES9018) full assembled board

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quanghao

quanghao

Member
Joined 2009
quanghao.com/
shattered_dream said:
So now DAC running... BUT :
I got one question regarding the legato...
Iḿ using an quanghau design DAC together with the legato I/V stage....
After startup the USB is active, and when I switch to optical input I can see that signal is locked, but there is no sound coming from the legato.
After switching off and on the legato stage, there is sound. Do u have an idea why this is ?
Click to expand...

May be the iv have prolem.
The iv get I out or v out from dac? Please tell me now .
Thanks
 
B

bertchai

Member
Joined 2007
Hi, I am finally back and have time to enjoy and play with my DACENDR. The firmware didn't really solved the issue of the first 0.5s mute, but I can live with it. Now I am having another query:
1. I connect the DAC to headphone amp for listening and the right hand side has an audible hum when i turn up the vol to max. the left side too , but less audible.
2. I notice some of the transistor in the shunt regulations are FZT957, while a few were hand soldered with FZT953. Have check the datasheet of these 2 transistors and the parameters are quite different. Has this got anything to do with the hum noise?
 
K

kimschips

Member
Joined 2004
About using ES9018 dac with zapfilter 2

What are your experience with this setup?
What type of output are you guys using (voltage or current from the dac)?

I am using balanced current output right now and if I test with squeezebox 3 I need to have the volume at max 95% else I get a distortet output (also same thing with a DVD player connected to the zapfilter 2 (all coax)

Could It be any difference if I connect the dac output as voltage single to the zapfilter 2?

Best regards
 
E

Erlend Sæterdal

Member
Joined 2007
kimschips said:
About using ES9018 dac with zapfilter 2

What are your experience with this setup?
What type of output are you guys using (voltage or current from the dac)?

I am using balanced current output right now and if I test with squeezebox 3 I need to have the volume at max 95% else I get a distortet output (also same thing with a DVD player connected to the zapfilter 2 (all coax)

Could It be any difference if I connect the dac output as voltage single to the zapfilter 2?

Best regards
Click to expand...

I use Voltage. Much more dynamic then Current output.
 
C

caad

Member
Joined 2010
kimschips said:
About using ES9018 dac with zapfilter 2

What are your experience with this setup?
What type of output are you guys using (voltage or current from the dac)?

I am using balanced current output right now and if I test with squeezebox 3 I need to have the volume at max 95% else I get a distortet output (also same thing with a DVD player connected to the zapfilter 2 (all coax)

Could It be any difference if I connect the dac output as voltage single to the zapfilter 2?

Best regards
Click to expand...

Hi.

The distortion issue with max 95% may be the ES9018 has VACC/2 on output (3,3V/2=1,65V). Have you raised the input of the Zap-filter to the same?

Also be aware that the Zap filter is made for DAC with much lower current then the ES9018. I would contact LCAudio for advise when using this DAC chip.

Br
Caad
 
K

kimschips

Member
Joined 2004
caad said:
Hi.

The distortion issue with max 95% may be the ES9018 has VACC/2 on output (3,3V/2=1,65V). Have you raised the input of the Zap-filter to the same?

Also be aware that the Zap filter is made for DAC with much lower current then the ES9018. I would contact LCAudio for advise when using this DAC chip.

Br
Caad
Click to expand...

How do I raise the input to handle the current output?

Thanks☺
 
L

linuxfan

Member
Joined 2007
Well I finally assembled my version-1 DAC-END-R, with Lundahl transformer output boards.
Sadly, not working.

With original firmware, I tried coax input (CD player) and optical input (TV). In both cases the display remained on "DSD" and no audio output.
Then I flashed the firmware to ver 57a. Slight change - now the display remains on "PCM" but still no audio output. I tried coax input, optical input, and also I2S input from Beaglebone Black. With each input, When I toggle from menu-mode back to normal-mode, I see "PCM-/0)-Hz" displayed.
It seems the DAC does not recognise the incoming digital data?

Andrea suggested I use firmware 64a. I flashed this firmware. No change.
Andrea suggested I check the ribbon cable and its connections. I removed the controller, tested the ribbon cable with multi-meter, re-soldered 2x connections at the controller. No change.

Is there anything else I can check, please?
 

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