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Old 3rd November 2012, 05:52 PM   #541
Boomer2 is offline Boomer2  Canada
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Quote:
Originally Posted by acko View Post
Thanks Acko. A good read and great timing for me. This literally stopped me in my tracks on purchasing $200 worth of Elma stepped attenuators directly connected to RCA connectors to give a dual mono inline passive volume control setup to be directly connect to my power amp with no preamp.

I think the $200 is better spent on a better DAC that handles onboard digital volume control. It looks like ES9023 is the only DAC chip from ESS that doesn't have onboard volume control. For anyone considering a passive preamp setup, ESS digital volume might be a good option. You can also pre-attenuate the output from the DAC to match your amp's input sensitivity.

Cheers.
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Old 3rd November 2012, 06:23 PM   #542
AR2 is offline AR2  United States
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Hello guys,
Is there anyone who successfully connected Acko DAC with GLT's Hifidunio code? I have been successful in driving Bufalo II, but now I am ready to switch to Acko DAC with 9012 chip. Here is my Bufalo implementation:
Search Results AR2 H i F i D U I N O
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Old 4th November 2012, 01:53 AM   #543
glt is offline glt  United States
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Yes: Hifiduino with AckoDAC H i F i D U I N O
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Old 4th November 2012, 04:39 AM   #544
AR2 is offline AR2  United States
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Thank you GLT. Yes I am aware of that post on your site, but I need to know if any hardware or code was adjusted or changed, comparing to regular use with Bufalo II. At least I know it is done, so it is possible. Now I need to figure out how. I contacted that guy, so hopefully I will find out. I am also using, per your recommendation, converter from 5 to 3.2 V for I2C line so that should be fine.

Best

AR2
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Old 7th November 2012, 03:49 PM   #545
AR2 is offline AR2  United States
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Just to post update here - finally I was able to complete my ACKO's DAC, after such a long line of mishaps solely due to my dumbness and sloppiness. With that it is really worth saying BIG thank you to Acko, from whom I have received an unprecedented support and help. I am still trying to finish all other parts in case and will post more pictures later. For now, here is the idea that someone might like and use. I used Delrin, a plastic material geared for machining purpose to house all the parts - DAC and regs closest possible to each other, and also to be able to have a shortest I2S leads to other electronics I have in the case. Yes I could do it in Aluminum as well, but I liked the durability and easy machining of this plastic. It is very strong that allowed me to tap threads in it, even the small one 6/32. Originally this concept was meant to house two sets of regs and two DACs, one on each side, but for now I am moving forward only with one set. It will be mounted as you see in vertical position. The black plastic base is only for the purpose of holding it during assembly.
I was able to connect to HIFIDUNIO code without any adjustments, and it worked with no problems. In my set up I have LightHarmonics USB to I2S board, Ian's FIFO board with dual clock and Acko's DAC with ESS9012 run in synchronous mode. The only part so far that I am aware is I have to figureout frequency readout, since for dual clock board I still have to receive Crystek 957 clocks, and my HIFIDUNIO board is still set for Bufalo II. I will deal with it when I am done with everything. First hardware, than software... I will update you with pictures when all is packed in case.
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Old 8th November 2012, 03:55 AM   #546
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Very slick!
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Old 8th November 2012, 04:22 AM   #547
glt is offline glt  United States
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Originally Posted by AR2 View Post
I was able to connect to HIFIDUNIO code without any adjustments, and it worked with no problems. In my set up I have LightHarmonics USB to I2S board, Ian's FIFO board with dual clock and Acko's DAC with ESS9012 run in synchronous mode. The only part so far that I am aware is I have to figureout frequency readout, since for dual clock board I still have to receive Crystek 957 clocks, and my HIFIDUNIO board is still set for Bufalo II. I will deal with it when I am done with everything. First hardware, than software... I will update you with pictures when all is packed in case.
I read from another poster that in Synchronous mode, the DPLL "doesn't know what to do" so the frequency value in the register is "all over". So in synchronous mode, the source clock must tell the Arduino controller what the sample frequency is. Ian is preparing a serial communication protocol for is Si570 clock board that will have such feature.

Nice setup!

Are those black capacitors high value tantalum caps?
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Old 8th November 2012, 05:44 AM   #548
qusp is offline qusp  Australia
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they are the same polymer caps used throughout the ackodac stuff. lowest Z on the market afaik. the Panasonic SP-Cap (Special Polymer)

looking good AR2! one thing though mate, make sure you dont make the analogue current output connections too long so you can have short i2s connections. I wopuld hazard a gues that a few cm extra w.fl cable will damage the sound less than a few cm extra twisted pair analogue cable

Last edited by qusp; 8th November 2012 at 05:48 AM.
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Old 8th November 2012, 06:02 AM   #549
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I'd be tempted to twist all of the power supply leads together too ... as in each pair twisted together rather than all running parallel like they are at the moment.


Otherwise that looks really, really nice! Given me some ideas about the next iteration of my case layout too.
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Old 8th November 2012, 08:31 AM   #550
AR2 is offline AR2  United States
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Originally Posted by glt View Post
I read from another poster that in Synchronous mode, the DPLL "doesn't know what to do" so the frequency value in the register is "all over". So in synchronous mode, the source clock must tell the Arduino controller what the sample frequency is. Ian is preparing a serial communication protocol for is Si570 clock board that will have such feature.

Nice setup!

Are those black capacitors high value tantalum caps?
GLT, that is correct, I noticed the same. Although I was thinking it is because in my Hifidunio code I have set 100 MHz for the clock speed, and clocks on Fifio board are just the ones Ian provided for testing - 22.... and 24.... MHz So I am glad to hear that new clock board will solve that so that Hifidunio will again provide a full functionality. As for the capacitors, Qusp gave answer. I would just add they are very good, but also very sensitive and easily damaged.
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