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Ian asynchronous I2S and S/PDIF FIFO KIT group buy

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#3,263
Greg Stewart said:
First, related to the exchange between @pistollero and @ofswitched on the LiFePO4 supply, the LiFePO4 cells can source a lot of current... depending on the quality of your cells, 200 Amps or more. This by itself poses a significant hazard. I posted some best practices I developed assembling the cells onto my board and handling them afterwards in posts 490 and 491 of this thread:

Develop ultra capacitor power supply and LiFePO4 battery power supply

I've promised a 3rd part, it will basically say you need to cover the cells and the bottom of the board to prevent inadvertant shorts during use and handling.

I am less worried about shock hazard from the cells, but once they are assembled on the board, if you use all positions, 4 cells are in series on 2 of the outputs to give you over 13V per output... be careful about possible shocks under wet or otherwise conductive conditions with them.

I am also less worried about fire and explosion hazards with these cells now. According to the literature, they are inherently much more safe than Lithium Polymer and Lithium Ion cells and generally won't catch fire or explode as those can. I found a good comparison between those cell types where I purchased my cells:

BatteryStuff Articles | Overview of the Different Types of Lithium Batteries on the Market

Still, the danger from shorts MUST be taken seriously.

Second, in an RPi DAC stack, there is little clearance between the FiFoPi board and the DAC board. This means you don't have a lot of room for upgrade clocks. I have assembled adapters with both NDK SDA and Crystek CCHD-957 so far using both Ian's original and latest clock adapter boards. The NDK's are no problem, but the Crysteks come very close to touching the bottom of the DAC board. You have to take care to minimize the distance between the bottom of the adapter board and the top of the sockets. When assembling the adapters to the socket pin, use the spare socket Ian provides for that work. I use the circuit board material runners that you break the adapters from as spacers between the top of the sockets and the board bottoms, positioning them so they contact the bottom of the boards ONLY and NOT the capacitors mounted on the bottom, so as not to add more height. Slightly thinner spacers would even be better, but you need some spacer to make sure you don't solder the pins into the sockets. Once you have the clock adapters assembled and in the FiFoPi, make sure to check for space between them and the next board when you assemble them together... AND correct it if they touch!

Greg in Mississippi
Click to expand...

Do not underestimate the risk of explosion of LiFePO4. Even the expensive
Tesla Model X, it had a fire that the driver is death in the car.

screen-shot-2018-03-23-at-8-34-09-pm.jpg

Tesla Model X fatal crash is now under investigation over potential use of Autopilot and 'post-crash fire' - Electrek

A Tesla burned to the ground while it was parked charging at one of the company’s Supercharger fast-charge stations in Norway.

Tesla-fire-Norway-Supercharger-626x375.jpg

Tesla Model S Catches Fire at Supercharger Station in Norway – News – Car and Driver

The accident is called accident, that is, we don't expect it to have this danger and need to monitor and control it. Products related to batteries are always safe after a few accidents.

However, few companies can afford the damage caused by battery explosions, so although LiFePO4 is a very good power supply, no major manufacturer is willing to introduce LiFePO4 power supply.
 
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#3,264
Do you also mean that those Tesla cars should have a sota sound reproduction inside ?

Tesla also makes battery wall devices for home... and it doesn't explose !
Btw funny thing is if you buy it for audio it only output AC.

This is more the Li that is dangerous, so LiPo of notebooks, phones, also !

Don't worry too much about Tesla, if you stay safe after a road trip, this will be your phone that kill ya, lol !

What we should say in the manual (@Greg Stewart, Iancanada) is one must buy A123 cells to an official seller. And also provides some adress.
 
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#3,265
@Greg Stewart, That's funny you say that thing to me I'm also a lover of it from 4 years...

This plastic cap should sound the same at the dielectric seems the same as well : plastic resine metalized with vapor deposit process. I had a look on the datasheets of several manufacterer : seems all the same with Tan los at 1.5%/1K Hz... but the Panansonic ECH-U that has Tan loss 0.6%/1 Khz and 2or 5% capacitance precision instead 20% for all the other brands I looked at (Rubycon & CDE) as also its ECH-A model !
Why I prefer the CDE instead the PPS is a mystery to me ! better inductance of the 0.1 uF from CDE, cause the ECH-U has a bigger size case (I have to check that!) ? Or the manufacturing process is different ? Or terminations : CDE is writting that its FCA caps has CuAgSn terminations ??? (Cu & Sn gives always a good subjective result, Ag... it depends despite its conductivity is almost the same than Cu...also a funny thing not so inviestigated yet)

regards, looking forwards your next tests with your FCA 1 uF.


Edit: have you also tried smd PEN caps?
 
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#3,266
ESSController & ES9038-PRO

Hi,
I connected the ESSControllers J3 pins to my ES9038-PRO from Twisted Pear which is connected to a Cronus/Hermes/BBB .

When I power up, the Controller display lights up and a string of dots run along the bottom and nothing happens. Guessing it doesn't recognize the ES9038-PRO DAC .

I have the I2C connections comming off the Twisted PearDAC pcb .



If I hold the switch in for two seconds the "Music signal analyzer mode" comes up and does display the format, real frequencies and data length correctly .

Does the controller only function with the ES90X8Q2M type dacs ?

-ICHI



ps- Hope this is the right thread to post this question .
 
#3,270
ichiban said:
Hi,
I connected the ESSControllers J3 pins to my ES9038-PRO from Twisted Pear which is connected to a Cronus/Hermes/BBB .

When I power up, the Controller display lights up and a string of dots run along the bottom and nothing happens. Guessing it doesn't recognize the ES9038-PRO DAC .

I have the I2C connections comming off the Twisted PearDAC pcb .



If I hold the switch in for two seconds the "Music signal analyzer mode" comes up and does display the format, real frequencies and data length correctly .

Does the controller only function with the ES90X8Q2M type dacs ?

-ICHI



ps- Hope this is the right thread to post this question .
Click to expand...

@ichiban,

Ess controller doesn't support ESS9038Pro so far, please read the user's manual
DocumentDownload/ESScontrollerManual.pdf at master * iancanada/DocumentDownload * GitHub

Regards,
Ian
 
#3,271
Blitz said:
Ian,

One question:

If the 5V reg output shall become high quality, would tit be good to connect it on its input sidetothe outputside of a 6.6V battery rail ? Is there a jumper or connection or mod for this ?

Best Regards
Click to expand...

Do you mean 5V reg output the 5V DC output of LifePO4? If so, it's a non-isolated out put, please don't connect it to any battery rail.

Regards,
Ian
 
#3,272
#3,274
@Ian, FifoPi's 16bit PCM I2S into 32bit feature does not work. No matter if I set the second setting of Jumper S1 to OFF or ON, I also need to enable Resampling in Volumio to play music normally. I use FioPi to connect to McFIFO with McDualXO and finally to BUFFALO-IIISE PRO.
 
#3,275
diyiggy said:
Do you also mean that those Tesla cars should have a sota sound reproduction inside ?

Tesla also makes battery wall devices for home... and it doesn't explose !
Btw funny thing is if you buy it for audio it only output AC.

This is more the Li that is dangerous, so LiPo of notebooks, phones, also !

Don't worry too much about Tesla, if you stay safe after a road trip, this will be your phone that kill ya, lol !

What we should say in the manual (@Greg Stewart, Iancanada) is one must buy A123 cells to an official seller. And also provides some adress.
Click to expand...

My meaning should not be difficult to understand, the meaning is just that do not underestimate the risk of explosion of LiFePO4. LiFePO4 may explode due to external factors even Tesla has designed many protective measures. The LiFePO4 used by Tesla will not be worse than A123 cells from the official seller.

In the Tesla manual, if you catch fire, you have to use a lot of water to cool down.

Tesla was going 116 mph before fiery crash killed two teens, federal agency says

fl-1530052725-xumwvxh662-snap-image.jpg

Tesla was going 116 mph before fiery crash killed two teens, federal agency says - Sun Sentinel
 
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#3,276
I believe you're alright with that. One should be carefull with all these modern batteries: Li-ion, LiPo, LiFePo, etc. You don't want to catch fire in your home.


One should putt the power board inside a solid metal case with proper connector in order to avoid unwanted problems,..
 
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