Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 45 - diyAudio
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Old 26th April 2012, 03:00 AM   #441
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building up 'breadboard' for testing different options, clocks, references, regs IV etc for the dac that will drive my tweeters, the woofers are already covered with the NTD1 with another ackodac. some progress below, should power it all up tonight or tomorrow. I will try running Titan through the fifo as well as direct. it has its own clock fanout buffer and smaller fifo afaik and some rather nice clocks, so should be an interesting comparison, titan is capable of higher bandwidth than the fifo is in its current state, so i'll stick to 192 or below for the tests. the platform is normally mounted above the IV with the NTD1 thus the fairly useless set up here, though it will provide another layer of space for batteries, references etc for the rest of the testing


yes the 4 channel dac will be a 2 box affair with transformers and preregulators, battery charge circuit, along with some control circuitry in one case and the rest, DC onwards, dacs, input circuitry and output stages in the other.

its a pretty crazy build even for these 2 channels, first up i'm driving the wire BAL-BAL headphone amp directly and have altered the input circuit slightly to allow current mode coupling

please excuse the messy bench and rough and ready layout, i'll be switching things in and out so its only temporary and no thats not earwax on the cotton buds, its cardas rosin flux everything is currently floating in this build too, so thats another thing i'll be optimizing with this, the analogue stages including those in the dac should have a common ground reference, but the rest can float really as its either batteries, or a dedicated secondary winding for every consumer, so we'll see. the regs on the ackodac are all choke input so they float too


dacs arent what they used to be hey? ha
Awesome!

What XO are you using now? CCHD957 22.xxxxMHz?
Did you get the 45.xxxx XO? I finished the double speed setting documant. Do you need that to configure the FIFO running ESS9018 at async mode with higher frequency MCLK?

I got the ESS9018 DAC last week, but I'm afraid I don't have time to try it until I finish upgrading the FIFO .
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Old 26th April 2012, 03:59 AM   #442
qusp is offline qusp  Australia
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just fired it up without headphone amp attached to confirm everything is as it should be and I get synchronous mode lock confirmation on the fifo and dac board LEDs no problem. input spdif switching works fine and it was set by default at 44.1k optical and 512fs. i'm just using it with the 100Mhz onboard crystek XO just left unpowered and a u.fl socket soldered directly to the clocks output pin and its local decoupling cap for ground, so loops should be nice and neat.

so i'm going to get some sleep and get up for first listen after soldering in the output wiring to the BAL-BAL wire as buffered IV stage. so all apears going to plan; other than the rubber rings anyway. initially i'll just test with the fifo spdif input, then i'll try titan USB->i2s->Dac. versus titan USB->i2s->Fifo->Dac

i'm just running that 22.xx crystek for now, so will be stuck with 88.2/96, I may buy the 45, or may wait till the si570 is ready, but may as well do the speed setting, or once youve set for higher speed it wont work at lower? another format I can try if possible if it will handle it, is now i have a u.fl socket directly on the 100Mhz, whether this will work as an external XO for the fifo? probably not I guess.

anyway i'll take some more pics of the setup all hooked up with the headphones tonight and post here with pics and initial listening impressions, may also send you an email to discuss finer details
cheers

looks great mate, a friend of mine remarked that my dac looks like a nuclear power plant control system ha
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Old 26th April 2012, 03:57 PM   #443
qusp is offline qusp  Australia
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Hey Ian, just checking, you mentioned that the 2 MCLK u.fl outputs are the same clock source, but different drivers. are the 2 drivers of comparable quality? if not, which is preferred to drive the dac from and which for other consumers like the spif board or another dac?
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Old 27th April 2012, 12:21 PM   #444
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Hey Ian, just checking, you mentioned that the 2 MCLK u.fl outputs are the same clock source, but different drivers. are the 2 drivers of comparable quality? if not, which is preferred to drive the dac from and which for other consumers like the spif board or another dac?
They are equal, just the different outputs of same driver. But if you really want to dig out which one is better, I'd like to say, the one closer to the driver is better, just theoretically.
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Old 28th April 2012, 02:06 PM   #445
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Actually, the dual clock board has a reserved double speed mode which could run 45.xxxx and 49.xxxx MHz XO for ES9018 or Buffalo DAC to make us more happy, especially for the synchronized mode. I'll publish the setting document after I conformed that on a real Buffalo III dac. Maybe I still need to inquire you when I go the hookup.
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Hi Ian

I am going to order the Buffalo III and very happy to know that you've ordered it and will publish the setting document. Will you use the Trident or Salas SSLV for the power?
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Old 28th April 2012, 03:05 PM   #446
CeeVee is offline CeeVee  Portugal
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Hi Qusp,

What are those regulators you are using ?

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Old 28th April 2012, 04:25 PM   #447
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which ones? haha theres about 14 separate regs of 3 different designs, plus A123 LiFePO4 batteries in that pic and theres even more now. I suppose you mean the blue ones with AC input i'm using for preregs? if yes then thats a layout by my mate Nattonrice that he and I collaborated on the design for, as we both had similar space issues to solve on our respective ackodac builds. will take either LT1963A or LT1764A linear tech 1.5A or 3A regs (extra heatsinking required to go above ~300-400ma)
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Old 28th April 2012, 04:47 PM   #448
CeeVee is offline CeeVee  Portugal
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Yes! thoseblue ones, i have same space issues....how to get my hands of a few of those.

I'm tired of redesigning Salas regs for specific applications, in this case for my BIII with FIFO/double clock/SPDIF interface...XMOS USBto I2S....so many regs, those nice compact ones are just what is needed.

I thought of including the SDTRANS384 but it will look like a nuclear power plant control center.....so SDTRANS is autonomous for now.

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Old 28th April 2012, 08:19 PM   #449
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haha yep sounds like you have a similar problem, bear in mind I will have roughly double this in the final 4 channel build, consisting of a bank of 20-25 of the handy blue regs as preregs for a total including the onboard on titan, fifo and beaglebone for control, for a total of ~60 regulated supplies, its nuts. I dont mind the 'technology for world domination' look, as long as I can make it look somewhat neat.

as for availability of the regs, I only have a couple spare (if that) after this build is done and not sure how many Nattonrice has left. i'll ask though, if not we could get some more as theyve proven pretty handy, shouldnt be too pricey as Golden Phoenix has the files on record now. i'll throw in for some more, how many would you need? i'd have to ask of course.

Alternatively I have an even more compact solution that also has a volumite equivalent onboard that will take the twisted pear volumite ADC DIP8, has toslink onboard complete with u.fl out, has spots for 2 x lt3032 bipolar low noise LDOs (+/-120ma and up to 20V) 1 x lt1764A/1963A adjustable, 1 x LT17643A/1963A fixed with Vsense, 1 x lt1763 adj, 1 x lt1763 fixed. it also has a battery monitor, low charge indicator and automated shutdown

if we get some, i would suggest we get a version with dc input too, or redesign this one with a score line so the rectifiers can be snapped off

anyway this is kinda on kinda off topic as its about implementing the resulting complexity us types end up with. maybe worth an entirely new thread actually, centered on managing the large networks of regulated supplies in the modern DIY DAC

Last edited by qusp; 28th April 2012 at 08:21 PM.
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Old 29th April 2012, 12:46 AM   #450
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anyway this is kinda on kinda off topic as its about implementing the resulting complexity us types end up with. maybe worth an entirely new thread actually, centered on managing the large networks of regulated supplies in the modern DIY DAC
would be very useful to have a thrad for this topic, the powersupplies are the real hassel building a DAC.
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