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Ian asynchronous I2S and S/PDIF FIFO KIT group buy
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Old Today, 01:57 AM   #3001
iancanada is offline iancanada  Canada
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Ian asynchronous I2S and S/PDIF FIFO KIT group buy
Quote:
Originally Posted by lucser View Post
Hi,
Sorry I was a bit confusing the IsolatorPi 2 with FIFoPi. Ian already confirmed IsolatorPi 2 working with 502DAC pro:
Something cool for Raspberry Pi/ODROID: I2S/DSD isolator HAT with native DSD decoder
but I do not know if FiFo Pi will work the same. Probably yes but only Ian could confirm.
Let me answer this question,

502DAC pro is based on master mode PCM5122. So, you will not need FifoPi, only IsolatorPi II is needed. If I'm not wrong, PCM5122 doesn't support DSD, so, also no need the DoP board.

Good weekend.
Ian
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Old Today, 02:01 AM   #3002
lucser is offline lucser  Romania
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Quote:
Originally Posted by Murdoc View Post
Hi lucser,
thanks for responding and your suggestion!
I'll think about it, as I've already read alot about the 502DAC, but guess, that the Digione signature is better in this regard. My DAC is a Yggdrasil, btw.
Cheers,
Matthias
You’re wellcome. I was also looking to Digione but I had already 502dac and happy with the performance plus having AES/EBU output so I was not ready for another 250usd expense .

Also I have another setup based on Odroid C2 that could be used with Ian’s Isolator Pi 2 board and now looking to the other boards from Ian new GB that, presumably, could ofer same or even better quality and more flexibility of the possible setups.

Currently I planned 2 setups:
1. Digital transporter to feed an external DAC based on a RPi+FiFoPi+502DAC (only for digital outputs) + a solution for I2S/HDMI out. For I2S out I understand that Ian is working on a board, there is also an AudioGD board and also Michael Kelly is now designing a new 502 digital board with Spdif (RCA&OPTICAL), AES/EBU and I2S/HDMI. For me optimal will be Ian’s board but is not yet confirmed. Also I will like to see if same setup is working wit Odroid C2 with an additional Isolator board from Ian. I have already the first version of Ian Isolator Pi but this is not fully working with 502Dac Pro but Maybe adding a FifoPi board will do work: Odroid C2+IsolatorPi +FiFoPi+502DAC Pro. Probably Ian could confirm but now he is very busy with the latest GB. Otherwise I could buy also the IsolatorPi 2 that is confirmed to work with Odroid C2.

2. An independent player RPi+FiFoPi + Ian’sDac dual ESS 9038+ Ian standard I/V stage. Also Icould probably add an I2S/HDMI digital out if possible for more flexibility. Same here I would like to see if Icould use the Odroid through old or new Isolator Pi board.
I was mentioning I2S a lot because I have 2 dacs with I2S HDMI input (Holo Spring and Gustard) that I would like to try.

For the player I’m also thinking to use Ian’s superb LiFePo4 psu board. The only downside for me is that is needed to be switch off for charging and when used with Rpi or Odroid first you need to shutdown the Rpi before power off the player. A bit inconvenient.

If I succed to sell my Gustard X20 dac Yggdrasil is also on my top list.

Last edited by lucser; Today at 02:05 AM.
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Old Today, 02:18 AM   #3003
lucser is offline lucser  Romania
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Quote:
Originally Posted by iancanada View Post
Let me answer this question,

502DAC pro is based on master mode PCM5122. So, you will not need FifoPi, only IsolatorPi II is needed. If I'm not wrong, PCM5122 doesn't support DSD, so, also no need the DoP board.

Good weekend.
Ian
Ian thank you very much for your reply. I know how busy you are with the preparation of the new GB so even more appreciated.

Im using the 502dac pro only for digital outputs (SPDIF BNC or AES) so I was looking for a solution to use it with a RPi and/or Odroid C2. (See my prev. Post for more details). I have your Isolator I that is not fully working with 502DAC pro so I was wondering if RPi+FiFoPi+502DAC Pro or Odroid C2+IsolatorPi+FiFoPi+ 502DAC pro are working only for providing digital output to an external dac. I do not use the DAC part of 502DAC.
Also if you can provide some info regarding your intended I2S HDMI board will be great.
Thank you again for your kind support and looking forward for a successful GB 2019.
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Old Today, 03:22 AM   #3004
iancanada is offline iancanada  Canada
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Ian asynchronous I2S and S/PDIF FIFO KIT group buy
Quote:
Originally Posted by lucser View Post
Ian thank you very much for your reply. I know how busy you are with the preparation of the new GB so even more appreciated.

I’m using the 502dac pro only for digital outputs (SPDIF BNC or AES) so I was looking for a solution to use it with a RPi and/or Odroid C2. (See my prev. Post for more details). I have your Isolator I that is not fully working with 502DAC pro so I was wondering if RPi+FiFoPi+502DAC Pro or Odroid C2+IsolatorPi+FiFoPi+ 502DAC pro are working only for providing digital output to an external dac. I do not use the DAC part of 502DAC.
Also if you can provide some info regarding your intended I2S HDMI board will be great.
Thank you again for your kind support and looking forward for a successful GB 2019.
502DAC pro makes use of PCM5122 to generate master clock, so even you use s/pdif output only, it still relies on PCM5122 for the timing. FifoPi works in different mode so only IsolatorPi II works with 502 DAC Pro.

BTW, I use one of my LifePO4 power supply for Rpi, FifoPi, DAC HAT and I/V stage everything. It integrated all in one on/off control and automatic charge management, I didn't see any problem.

I designed a I2S to HDMI transmitter/receiver KIT, they can work with FifoPi as a digital transformer. But I'm afraid it can not catch up with this GB.
Click the image to open in full size.
HDMI_I2S_DSD_KIT
by Ian, on Flickr

Regards,
Ian

Last edited by iancanada; Today at 03:31 AM.
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Old Today, 04:35 AM   #3005
lucser is offline lucser  Romania
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[QUOTE=iancanada;5699471]502DAC pro makes use of PCM5122 to generate master clock, so even you use s/pdif output only, it still relies on PCM5122 for the timing. FifoPi works in different mode so only IsolatorPi II works with 502 DAC Pro.

BTW, I use one of my LifePO4 power supply for Rpi, FifoPi, DAC HAT and I/V stage everything. It integrated all in one on/off control and automatic charge management, I didn't see any problem.

I designed a I2S to HDMI transmitter/receiver KIT, they can work with FifoPi as a digital transformer. But I'm afraid it can not catch up with this GB.

Regards,
Ian[/QUOTE

Thank you,
Now it is clear.
If I want to use the 502DAC Pro I need an Isolator Pi II. This will work as: RPi or Odroid C2 + IsolatorPi II + 502Dac Pro.

For the other setup I could use RPi+FiFoPi+ Ian DAC Board + Ian I/V stage. To use Odroid C2 instead of RPi i need an IsolatorPi (I or II) before the FiFo Pi. In this setup there is any board (beside your I2S HDMI Tx board when will be available) that could provide also digital outputs for an external DAC?

Regarding to the LifePO4 power supply for Rpi I’m sure it is working. I was reffering to the fact that is recommended to shutdown the RPi first, before switching off the power supply to avoid the sdcard corruption. Didn’t happened to me but I understand that SDcard corruption is a risk if RPi is powered off without proper shutdown. Not a big thing to first shutdown the Rpi and swtch off the power supply after, just a bit inconvenient.
There are some solutions to implement a hardware shutdown button for RPi using a switch to ground the pin 5 from gpio and a script but then it is still needed a delayed (maybe 10-20sec) to switch off the power supply.
Anyhow the Pros of such high quality power supply cancel out the inconvenience of shutdown sequence.

I suppose that the IsolatorPi II will be also available in this GB.

Cheers

Last edited by lucser; Today at 04:41 AM.
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Old Today, 02:16 PM   #3006
iancanada is offline iancanada  Canada
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Ian asynchronous I2S and S/PDIF FIFO KIT group buy
@lucser

Yes, IsolatroPi II is available. You can find the user's manual of IsolatorPi II at here:

DocumentDownload/IsolatorPi at master * iancanada/DocumentDownload * GitHub

Good weekend.
Ian
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Old Today, 02:38 PM   #3007
MikeyFresh is offline MikeyFresh  United States
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Ian asynchronous I2S and S/PDIF FIFO KIT group buy
Quote:
Originally Posted by iancanada View Post
@lucser

Yes, IsolatroPi II is available. You can find the user's manual of IsolatorPi II at here:

DocumentDownload/IsolatorPi at master * iancanada/DocumentDownload * GitHub

Good weekend.
Ian
Hi Ian,
Great work, we are all very excited!
Just a bit of clarity on the IsolatorPi II please, I'm sorry if I missed this at some point previously.

IsolatorPi II was not part of GB2017 per se, that was the original IsolatorPi, correct? If so, I don't think we've seen this newer version as confirmed for the GB2019 until now, is it still the same $49 as the original IsolatorPi?

Lastly, I think you've said in the last page or two that the forthcoming FifoPi is NOT compatible with master clock mode DACs such as the HiFiBerry DAC+ Pro, do I have that right?

Thanks again!
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Old Today, 03:57 PM   #3008
iancanada is offline iancanada  Canada
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@MikeyFresh

Yes, IsolatorPi II was available just before this GB. The price keeps no change as IsolatorPi. So it will be included.

FifoPi work for DACs are sync mode. IsolatorPi II works for DAC at both normal mode(async) and master mode. So you have to use IsolatorPi II for 502 Pro.

Regards,
Ian
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Old Today, 04:07 PM   #3009
iancanada is offline iancanada  Canada
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Default LifePO4 power supply user's manual (draft)

LifePO4 power supply user's manual (draft) is here:

Develop ultra capacitor power supply and LiFePO4 battery power supply

Good weekend.
Ian
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Old Today, 06:41 PM   #3010
Greg Stewart is offline Greg Stewart  United States
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Ian asynchronous I2S and S/PDIF FIFO KIT group buy
@lucser & @Murdoc

Interesting projects you two have planned. Some thoughts (sorry, slightly off-topic)...

First, on the standard 502DAC board, I am a little confused about it running in Master mode while using the 'Industry-standard PCM5122 drivers'. I may not be up on the latest developments in this areea, but all of the basic PCM5122 drivers I'm familiar with only run in Slave mode. There are product specific drivers such as those for the HiFiBerry DAC+Pro and their similar units and the Allo Boss that provide Master mode, but also AFAIK, these don't run with other companies' DACs. You 2 have run those setups... Am I missing something here?

As an aside, both the the HiFiBerry DAC+Pro and Allo Bosses (original and 1.2 version) can be run with a basic I2S output PCM5122 driver in slave mode. My experience with the HFBD+P and the original Boss are that after putting them on an isolator (either Ian's or Allo's) and a Kali reclocker (or soon an Ian FIFOPi as an alternative to both), I preferred them both in Slave mode with the isolation and reclocking provided by those boards than in Master mode either directly on an RPi or with an isolator board in-between. The later Allo Boss 1.2 was a different animal, I did prefer it with an isolator and operated in Master mode to using an isolator+Kali in Slave mode.

Given this (and reviewing the 502DAC block diagrams) I suspect that trying the most basic I2S output drivers MIGHT allow the 502DAC's analog output and S/PDIF generators to operate ok. Curious what you find if you get a chance to try this.

Second, on the 502DAC ($109) versus the 502DAC Pro ($???) versus the Allo DigiOne ($99) versus the Allo DigiOne Signature ($239), it of course depends on what you are wanting to do.

IF you don't already have one of the 502DAC units (which appear to be solidly engineered units as examined via pictures) AND only need a S/PDIF out RPi player/streamer, then the Allo units seem to be the best buys to me... the basic DigiOne if you don't need a top unit, the full Signature if you want one of the best in that class. Of course, neither of those units work with anything but a bare RPi.

IF you already have one of the 502DAC units OR need an analog output from the player/streamer, then those units are of course the choices.

Now, back more on topic... @Lucser, you throw in I2S over HDMI. Looking at Ian's board for this, it appears it could be inserted between an RPi and a 502DAC or DigiOne (regular or Signature) and all should work ok as the I2S and I2C lines should all pass-through. OR it could be added either before or after a FIFOPi with one of Ian's (or someone else's) Slave-mode DAC hats to get both an I2S over HDMI feed to a separate DAC AND an analog output from that player. My gut-feel is that the I2S over HDMI would be better if it was after the FIFOPi (lower-jitter I2S input), but that your DAC hat's output would be better if it was before (shorter I2S lines to the DAC hat). Could be another interesting area for some experiments once Ian releases that board.

Another couple of things to consider with the units in Ian's upcoming GB, based on the pictures already released. First, the latest versions of his ES90x8Q2M DAC hats show a place to connect a S/PDIF input. I assume the firmware in the lastest version of his DAC controller allows selection of this as an input. SO using one of his DAC hats along with his DAC controller, you should now have a dual-input DAC, if my guesses are correct!

Second, a output stage we've not seen before from Ian is his standard opamp I/V stage. This appears to have 3 dual opamps in what I bet is the standard "One dual opamp per channel with each half used as an I/V stage, these directly feeding the balanced outputs with some additional passive filtering, and the other dual opamp used as two balanced-to-single-ended conversion stages". Nice! Of course, again if I am correct on my guesses, you can roll opamps to your heart's content! I've got some Sparkos dual discrete opamps sitting here to try. Then I can see how a similarly powered Ian FIFOPi -> ES90x8Q2M -> Std I/V stage stack compares to an Allo Katana with roughly equivalent output stages. A previous comparison I did had a better-powered Ian setup using the best transformer output I've tried so far (Onetics 600R:600R) falling slightly behind a still very good-powered Katana. This might reverse that comparison... of course, at a price! Allo, by incorporating the Sparkos opamp circuits into their output stage board can bring the Sparkos discrete opamp technology in their Katana to you at a price that you can't match if you have to buy 3 of the Sparkos dual opamps separately.

Now to get back to something I promised to Ian... SORRY!

Greg in Mississippi

P.S. @Lucser, I've been running a number of RPi-based setups for over 3 years now with various DAC hats or connected via I2S to larger DACs. I've never performed a controlled power down on my RPis, I've ALWAYS just unplugged the power. I haven't corrupted an SD card yet. I'm not saying it doesn't happen, but my experience is that the odds seem pretty low.
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Last edited by Greg Stewart; Today at 06:48 PM.
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