Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter

[bigpandahk]

Originally Posted by iancanada

All passive battery manage board PCB posted today for evaluation. Hope testing group will get them soon.

bigpandahk: Just sent a new isolator PCB together, four resistor arrays assembled. Hope it works.

Ian

Ian

You are GREAT. THANKS VERY MUCH.

I am still trying hard to assemble the resistor arrays correctly.

[bigpandahk]

Followed Ian's procedures and with the help of microscope, I finally soldered the resistor arrays without any short. The isolator board is working now and sound GREAT.

With the board, I can clearly hear a much better bass. Will report again after run-in.

[hochopeper]

Great news! Look forward to hearing more reports on how these go

[hirez69]

Originally Posted by iancanada

hirez69:

The max input DC is rated at 5.5V. Could go a bit higher based on real testing, because of output current is much lower then 200ma for each LDO. But not recommend higher than 6.5V

Ian

Thank you.
I own a 6.6V LiFePO4 battery, but I think it's better not to use it.

[bigpandahk]

Originally Posted by hirez69

Thank you.
I own a 6.6V LiFePO4 battery, but I think it's better not to use it.

I am also using LiFEPO4 battery without any problem with both clock and FIFO. 6.6V is only when the battery is fully charged and will drop below 6.5V in very short time.

[iancanada]

Originally Posted by bigpandahk

Followed Ian's procedures and with the help of microscope, I finally soldered the resistor arrays without any short. The isolator board is working now and sound GREAT.

With the board, I can clearly hear a much better bass. Will report again after run-in.

As I said you can make it. Did your hand survive from the hot air .

I like the isolator board, it makes the grounding design much easier for a DAC to get rid of ground loop. The clock should always be treated as an analog part for a DAC. The isolator board makes them together.

Ian

[qusp]

Originally Posted by bigpandahk

I am also using LiFEPO4 battery without any problem with both clock and FIFO. 6.6V is only when the battery is fully charged and will drop below 6.5V in very short time.

no thats incorrect, at least for any legit A123 ive had/have, 3v3 is the nominal LiFePO4 chemistry voltage; fully charged is up to 3v65 so 2 in series like you have is 7.3V!! then they usually drop to around 3v45 (6v9) pretty quickly and spend about 80% or more of their time slowly going down to 3v25 per cell and then drop pretty quickly to 2v9-3v. the vast majority is of that is spent well ABOVE 3v3/6v6

[bigpandahk]

Originally Posted by iancanada

As I said you can make it. Did your hand survive from the hot air .

I like the isolator board, it makes the grounding design much easier for a DAC to get rid of ground loop. The clock should always be treated as an analog part for a DAC. The isolator board makes them together.

Ian

Yes, the board is a great design, I will use the additional isolator for I2C and see if there is any further improvement.

[iancanada]

Originally Posted by bigpandahk

Yes, the board is a great design, I will use the additional isolator for I2C and see if there is any further improvement.

Yes, you should. You may try to place the I2C isolator at the empty space. You can source it from digikey.

Ian

[bigpandahk]

Originally Posted by qusp

no thats incorrect, at least for any legit A123 ive had/have, 3v3 is the nominal LiFePO4 chemistry voltage; fully charged is up to 3v65 so 2 in series like you have is 7.3V!! then they usually drop to around 3v45 (6v9) pretty quickly and spend about 80% or more of their time slowly going down to 3v25 per cell and then drop pretty quickly to 2v9-3v. the vast majority is of that is spent well ABOVE 3v3/6v6

I am using China made "LiFEPO4", can't proof if it is real "LiFePO4" fully charged voltage is 7.2V, 3.4 is the highest voltage removed from charger and drop quickly below 3.3. Two battery can power the clock + FIFO + SPDIF for more than 18 hours.