Dear all,
I'm interesting to buy this product, because I want to build my own streamer based on my Raspberry Pi. My goal it's to have :
- Raspberry Pi as streamer
- Use this I2S Isolator
- Use card with specific clock and connect it to I2S HDMI output
- And I want to have additionnal SPDIF Output
My questions are :
Which components do I need to buy in this list (http://www.diyaudio.com/forums/grou...-pdif-fifo-kit-group-buy-188.html#post4357477) for my project ?
Does this card is compatible with this SPDIF interface (http://www.diyaudio.com/forums/group-buys/207438-ian-asynchronous-i2s-s-pdif-fifo-kit-group-buy.html) ?
Sorry for my questions but there is many thread and it's not clear for me.
Thanks for your help.
I'm interesting to buy this product, because I want to build my own streamer based on my Raspberry Pi. My goal it's to have :
- Raspberry Pi as streamer
- Use this I2S Isolator
- Use card with specific clock and connect it to I2S HDMI output
- And I want to have additionnal SPDIF Output
My questions are :
Which components do I need to buy in this list (http://www.diyaudio.com/forums/grou...-pdif-fifo-kit-group-buy-188.html#post4357477) for my project ?
Does this card is compatible with this SPDIF interface (http://www.diyaudio.com/forums/group-buys/207438-ian-asynchronous-i2s-s-pdif-fifo-kit-group-buy.html) ?
Sorry for my questions but there is many thread and it's not clear for me.
Thanks for your help.
Can you confirm (or otherwise) the I2S lines passing though the 40-pin header are isolated on the "top" side of the board (or are they simply pass-thru)? Or are the only isolated I2S lines the ones available through the U.FL connectors?
I as because you have earlier stated "This isloater works in transparent mode. It looks as if there is nothing between RPi and DAC for software." so though best to get clarification around my assumption.
Like Greg in an earlier post I am interested in using with a Kali re-clocker to gain isolation prior to re-clocking The Kali works through the 40-pin header so if the isolated signal is via the U.FL only and not via the header it well be very difficult to combine the 2 boards.
Thanks
Last edited:
Hi ChrisMmm,
Yes, I can confirm this isolator isolates I2S signals passing through RPi 40PIN GPIO connector. So, any I2S device on top of this isolator will be isolated from RPi I2S signals, as well as RPi ground.
Regards,
Ian
Cool, thanks Ian.
On close look at your pics it became evident the I2S signals (well at least one I could see) are routed to the GPIO, U.FL and Odroid header.
I use a Raspberry Pi in combination with a Kali Reclocker. The Kali feeds the reclocked I2S signals to an external (Audio-GD) Dac.
Do I in my setup benefit from this I2S/DSD Isolator hat? Will sound quality be improved?
I know prices are not available yet but can any indication be given (with a broad range)?
Do I in my setup benefit from this I2S/DSD Isolator hat? Will sound quality be improved?
I know prices are not available yet but can any indication be given (with a broad range)?
RPi DACs and anything after PPi, such as FIFO KIT will benefit from this isolator.
Ian
Isolated power supply
A brand new isolated power supply is fed into the isolator. This new power supply will power PRI DAC that is stacked on top of the isolator, as well as half of the isolator, both 5V and 3.3V.
This new power supply will be 100% galvanic isolated from RPi. Ground loop will be cut completely to eliminate EMI noise introduced from ground. In this case, new power supply can be treated as audio power supply.
Linear power supply would be highly recommended, and, for even lower noise level, battery power is also possible.
Ian
A brand new isolated power supply is fed into the isolator. This new power supply will power PRI DAC that is stacked on top of the isolator, as well as half of the isolator, both 5V and 3.3V.
This new power supply will be 100% galvanic isolated from RPi. Ground loop will be cut completely to eliminate EMI noise introduced from ground. In this case, new power supply can be treated as audio power supply.
Linear power supply would be highly recommended, and, for even lower noise level, battery power is also possible.
Ian
Attachments
Very cool project Ian! How is the 3.3v created? Is there an LDO on the isolator board?
/dom
DoP decoder board
This DoP decoder board was designed for RPi to enable its native DSD playback features. It has a 10P board to board connector at bottom of PCB to stack on top of my isolator. But actually it can be used for any DAC that capable for both I2S and DSD.
To make it easier to understand the way it works, here are some Q.A about DoP and this decoder.
What is DoP?
DoP is a protocol to transfer native DSD data over 24bit I2S package.
Why DoP?
The purpose of DoP is to send and receive DSD data by making use of existing I2S or S/PDIF I/O and devices.
Can DoP stream be converted to native DSD again?
Yes, DoP can be converted back to native DSD by either software or hardware based DoP decoder.
Is DoP a lossless protocol?
Yes, DoP is a bit perfect protocol. Native DSD stream can be re-generated losslesslly. There will be no difference with the original native DSD stream after decoding.
Does the DoP decoder still compatible with I2S music?
Yes, a well designed DoP decoder decodes DSD stream only when DoP mark is detected, normal I2S data will pass-through without any change.
Ian
This DoP decoder board was designed for RPi to enable its native DSD playback features. It has a 10P board to board connector at bottom of PCB to stack on top of my isolator. But actually it can be used for any DAC that capable for both I2S and DSD.
To make it easier to understand the way it works, here are some Q.A about DoP and this decoder.
What is DoP?
DoP is a protocol to transfer native DSD data over 24bit I2S package.
Why DoP?
The purpose of DoP is to send and receive DSD data by making use of existing I2S or S/PDIF I/O and devices.
Can DoP stream be converted to native DSD again?
Yes, DoP can be converted back to native DSD by either software or hardware based DoP decoder.
Is DoP a lossless protocol?
Yes, DoP is a bit perfect protocol. Native DSD stream can be re-generated losslesslly. There will be no difference with the original native DSD stream after decoding.
Does the DoP decoder still compatible with I2S music?
Yes, a well designed DoP decoder decodes DSD stream only when DoP mark is detected, normal I2S data will pass-through without any change.
Ian
Attachments
Last edited:
DoP decoder works with RPi isolator as a daughter board
DoP decoder works with RPi isolator as a daughter board.
DopDecoderIsolator1 by Ian, on Flickr
DopDecoderIsolator2 by Ian, on Flickr
DopDecoderIsolator3 by Ian, on Flickr
Ian
DoP decoder works with RPi isolator as a daughter board.
DopDecoderIsolator1 by Ian, on Flickr
DopDecoderIsolator2 by Ian, on Flickr
DopDecoderIsolator3 by Ian, on Flickr
Ian
