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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
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Old 23rd May 2017, 11:07 AM   #21
Yatsushiro is offline Yatsushiro  United Kingdom
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Location: Now, England, but France soon...
Quote:
Originally Posted by Tomax View Post
Hi Ian,

anything new on this topic or did you discard your plans building this HAT DAC?
It exists!

Click the image to open in full size.
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Old 23rd May 2017, 12:04 PM   #22
Tomax is offline Tomax
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Hi Yatsushiro, is there a GB or anything else where you can buy Ian's PCB?
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Old 23rd May 2017, 01:59 PM   #23
Yatsushiro is offline Yatsushiro  United Kingdom
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Quote:
Originally Posted by Tomax View Post
Hi Yatsushiro, is there a GB or anything else where you can buy Ian's PCB?
I'm not sure, I'm trying to find out myself! just saw the pictures in another thread...
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Old 27th June 2017, 03:09 PM   #24
TioFrancotirador is offline TioFrancotirador  Poland
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Hopefully it is not to late to replace it with es9028q2m.
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Old 27th June 2017, 03:32 PM   #25
iancanada is offline iancanada  Canada
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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
Quote:
Originally Posted by TioFrancotirador View Post
Hopefully it is not to late to replace it with es9028q2m.
@TioFrancotirador

ES9028Q2M is possible. The only thing is that ESS is not interested in our DIYer. They are only interested in cell phone manufacturers now. So, it had to get technical support.

Please let me know if you have more information about ES9028Q2M

Thanks for your suggestion.

Regards,
Ian
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Old 27th June 2017, 05:04 PM   #26
TioFrancotirador is offline TioFrancotirador  Poland
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Quote:
Originally Posted by iancanada View Post
@TioFrancotirador

ES9028Q2M is possible. The only thing is that ESS is not interested in our DIYer. They are only interested in cell phone manufacturers now. So, it had to get technical support.

Please let me know if you have more information about ES9028Q2M

Thanks for your suggestion.

Regards,
Ian
es9028q2m supposed to be direct replacement for es9018k2m. Like es9028 for es9018.
I do not have much information on that other what is already officially published.
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Old 27th June 2017, 06:46 PM   #27
iancanada is offline iancanada  Canada
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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
Quote:
Originally Posted by TioFrancotirador View Post
es9028q2m supposed to be direct replacement for es9018k2m. Like es9028 for es9018.
I do not have much information on that other what is already officially published.
OK if it is direct replacement, let me see if I can try it.

Ian
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Old 2nd July 2017, 08:18 AM   #28
TioFrancotirador is offline TioFrancotirador  Poland
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@Ian,

One thing to consider if it is not tool late of course.
Regarding bitperfect volume control and fir selection.
As alternative to writing the drivers the following thing could be done:
Design an daughter board with some eprom on it where as input you could have a 10k regular pot. Pot will work as voltage divider between 3.3V and GND. Eprom senses divided voltage and translates it to appropriate I2C volume level command.
I like such solution because it gives you an analog feeling of volume control (regular pot) while being bit perfect at the same time. Such solution is used by es9018 sabre buffalo from twisteadperaaudio and soekris dam1021. I love it.
As for the FIR selection, for me it could be done in form of jumpers. Once chosen and set stays there forever, at least in my case.
Not sure what is others preference ...
What do you think?
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Old 2nd July 2017, 04:03 PM   #29
iancanada is offline iancanada  Canada
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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
Quote:
Originally Posted by TioFrancotirador View Post
@Ian,

One thing to consider if it is not tool late of course.
Regarding bitperfect volume control and fir selection.
As alternative to writing the drivers the following thing could be done:
Design an daughter board with some eprom on it where as input you could have a 10k regular pot. Pot will work as voltage divider between 3.3V and GND. Eprom senses divided voltage and translates it to appropriate I2C volume level command.
I like such solution because it gives you an analog feeling of volume control (regular pot) while being bit perfect at the same time. Such solution is used by es9018 sabre buffalo from twisteadperaaudio and soekris dam1021. I love it.
As for the FIR selection, for me it could be done in form of jumpers. Once chosen and set stays there forever, at least in my case.
Not sure what is others preference ...
What do you think?
Hi TioFrancotirador,

That's a very good idea. I like it. I'll take it into consideration.

ES9018 volume control is not bitperfact because it is a digital volume control. But it's 32 bit volume control so the accuracy is not bad.

Regards,
Ian
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Old 2nd July 2017, 04:32 PM   #30
TioFrancotirador is offline TioFrancotirador  Poland
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Join Date: May 2014
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Quote:
Originally Posted by iancanada View Post
Hi TioFrancotirador,

That's a very good idea. I like it. I'll take it into consideration.

ES9018 volume control is not bitperfact because it is a digital volume control. But it's 32 bit volume control so the accuracy is not bad.

Regards,
Ian
Under this link there is document explaining ess digital volume approach:
http://www.diyinhk.com/support/digit...me-control.pdf
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