Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 275 - diyAudio
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Old 6th May 2013, 10:33 AM   #2741
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Greetings,

I got my batteries from DVB-projekt's contact.

Does anyone have a schematic for a batery management for them?
will Ian's pcb work well with these?

regards.
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Old 6th May 2013, 10:56 AM   #2742
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Quote:
Originally Posted by necplusultra View Post
Greetings,

I got my batteries from DVB-projekt's contact.

Does anyone have a schematic for a batery management for them?
will Ian's pcb work well with these?

regards.
You could use Ian's pcb without problems!

I use THIS LiFePo4 charger from them with Ian's pcb in between.
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Old 7th May 2013, 11:55 PM   #2743
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Quote:
Originally Posted by bigpandahk View Post
Ian

tested the i570 with BIII yesterday and the sound is great. thanks for your great work.

As I have the single and dual clock boards, I wonder if I can use those as the clock source for other devices such as CD transport, or even the Amanero reclock?
Hi bigpandahk,

Both single and dual clock board were designed can work independent from the FIFO. They all have DC power input connector. Dual XO clock board can even switch MCLK frequency manually by the push button. Re-Clock function is also available there. Hope you can make good use of them.

Regards,

Ian
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Old 7th May 2013, 11:58 PM   #2744
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Quote:
Originally Posted by necplusultra View Post
Greetings,

I got my batteries from DVB-projekt's contact.

Does anyone have a schematic for a batery management for them?
will Ian's pcb work well with these?

regards.
Hope it helps.

Ian
Attached Files
File Type: pdf BatteryManagementV2.5.pdf (163.0 KB, 63 views)
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Old 10th May 2013, 03:03 AM   #2745
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Default Power the dual XO clock board by 3.2V LiFePO4 battery direct

Some changes have to make to the Dual XO clock board to power it by a LiFePO4 battery cell directly because of the internal LDOs.

Steps (Please see the pictures for details):

1. Remove the two on-board ADP151 3.3V LDOs U7 and U8 from PCB, SMT re-work tool is preferred.

2. Short Pin1 and Pin5 of the footprint of both U7 and U8 by two 0 ohm 1206 chip resistor jumpers.

3. An isolator board must be placed between FIFO and the clock board in your system.
(Without this isolator board, FIFO board could be damaged from the shorting of two power supply)

4. Connecting one LiFePO4 battery cell to the DC input connector J5 on the dual XO clock board via a battery management board.

Some comments:
1. 26650 would be a better choice than the 18650 for selecting the LiFePO4 battery cell.

2. Magnet ring is suggested for the battery cable because of the load frequency could be very high for a clock board.

3. If it is possible, try to monitor the battery voltage by a passive voltage meter to avoid any damage caused by over discharge.

Ian
Attached Images
File Type: jpg ByPassU7.JPG (360.0 KB, 469 views)
File Type: jpg ByPassU8.JPG (393.0 KB, 431 views)
File Type: jpg BatteryFromJ5.JPG (320.2 KB, 428 views)
File Type: jpg BatteryDirectDualXO.JPG (213.9 KB, 426 views)
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Old 10th May 2013, 04:49 AM   #2746
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Quote:
Originally Posted by iancanada View Post
Magnet ring is suggested for the battery cable because of the load frequency could be very high for a clock board.
Hi Ian,

did you have a part no. from Mouser or Digikey for the recommended ring?

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Old 10th May 2013, 08:13 AM   #2747
Armand is offline Armand  Norway
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Default MiniDSP & Buffalo

I am using a MiniDSP digital XO for my 3 way system. I am happy with it, but I want to see what a better DAC can do and have a 8 channel Buffalo 3 on my way. I am planning to hook it up to three of the four I2S busses available on the MiniDSP.
However, if I want to use a FIFO KIT, I assume the logical approach is to feed the MiniDSP with the I2S stream from the FIFO KIT and set up both the MiniDSP and Buffalo3 DAC to use the clock from the FIFO KIT? Am I correct?
If that is an option I am up for GBV. :-)
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Old 10th May 2013, 08:27 AM   #2748
qusp is offline qusp  Australia
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the miniDSP will not take full advantage of the fifo, especially the last gen boards. the miniDSP resamples everything to 48 or 96kHz (so to get any use out of the fifo at all, you would need to resample all of your library to 48 or 96khz beforehand), it has a fairly noisy power supply, lacks impedance controlled i2s inputs and outputs and its DSP adds enough jitter to make the input jitter fairly insignificant within reason.

myself I would wait till Ian finishes the multichannel fifo and put the fifo between the miniDSP and BIII.

I have been considering getting the miniSHARC and resampling all my music to 48 or 96khz and designing a board to properly interface the fifo to miniSHARC, but I do think the advantages are few. its hard to know exactly the amount of jitter the DSP adds, but going by other similar devices it wont be insignificant.

Last edited by qusp; 10th May 2013 at 08:30 AM.
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Old 10th May 2013, 09:07 AM   #2749
Armand is offline Armand  Norway
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Thanks a lot for that insight. I guess I'll wait for Ian's multichannel FIFO then.
In the meantime I can learn a thing ot two about the I2S bus and the interfacing to Buffalo. I foresee problems
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Old 10th May 2013, 10:34 AM   #2750
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I agree with what qusp has said, with the minidsp boards the preference is to have a multichannel FIFO/reclock between DSP and DAC.
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