Build Thread for TPA BIII + Ian Async I2S FIFO + OPC NTD1 + Salas SSLV

[iancanada]

I have now tryied to connect all the ground wires and it did not make any different.

Still very quiet despite everything looks ok.

OK, Now I suggest

1, Connect the BII directly to the FIFO board I2S output port rather than the clock board to see if it's working

2, replace the double xo clock board with the single xo clock board (with onbord 11.2896 xo) , play 44.1K audio to see if there is sound.

Good luck.

Ian

 

[karvid]

Yes, Yes, Yes...!!
It plays sweet music without the dual clock bord and also with the single clock board!!

So the problems seems to be the dual clock board.

What can be wrong with the dual board?

 

[karvid]

Ian,
I just noticed that it does not play or let the I2S signal go through to the BII dac without the 10-pin FPC/FFC cable connected to a clockboard. But perhaps it exchanges some signal necessary for the Fifo board.

Good night !

 

[bigpandahk]

I'm keeping my eye on this thread, as I am too planning a similar project in the near future and want to draw as much wisdom/info as I can out of this thread to simplify my own build

Welcome to the party Adrain.

 

[iancanada]

Ian,
I just noticed that it does not play or let the I2S signal go through to the BII dac without the 10-pin FPC/FFC cable connected to a clockboard. But perhaps it exchanges some signal necessary for the Fifo board.

Good night !

Congratulations, Karvid!

Yes, the FPC/FFC has control signals inside, so, it won't work without it.

Ian

 

[Adrculda]

SO...
What toroid are you using bigpandahk ??

I work in a machine shop now and have access to quite a few machines and can mill my own case
Ordered the TFT and the DUE today

Ooooooo and it's the 5" ( 800x480 )

 

[bigpandahk]

I ordered the toroid from China who has very good reputation in custom made toroid for DIY. The 80VA cost me US$50.

 

[Adrculda]

What are the voltages if you don't mind me asking..

Also,
Are you using a pot or encoder for volume control ??

 

[bigpandahk]

primary 2x115V Secondary：6V 1.25A x 2, 12V 1.25A x 2, 5V 1A x 4, 9V 1.5A x1

I use encoder for volume control

 

[karvid]

Thanks Ian,
will the jitter eating Fifo work even without the clock board?

I could then for the time being play without the clock board all my 192kHz files. With the single clock board I will be rather limited.

But what about the dual clock board?

 

[qusp]

no it wont work without the clock board, where would it get its clock....

it still needs to take a clock from the single clock board for operation, you can take the i2s directly from the fifo board, which simply means you get an output with the jitter of the clock + the jitter of the FPGA, taking the output from the clock board means its taking the output from the fifo board and reclocking it, meaning the jitter is that of the clock itself, plus the jitter of the flipflop/clock buffer

 

[karvid]

no it wont work without the clock board, where would it get its clock....

it still needs to take a clock from the single clock board for operation, you can take the i2s directly from the fifo board, which simply means you get an output with the jitter of the clock + the jitter of the FPGA, taking the output from the clock board means its taking the output from the fifo board and reclocking it, meaning the jitter is that of the clock itself, plus the jitter of the flipflop/clock buffer

Sorry I wasn't so clear.
Yes, I mean with one of the clock board connected, but the I2S signal taken directly from the Fifo board. But as you say I don't get any advantages with this. So I have to wait for a working dual clock then.

 

[necplusultra]

I know this sounds too simplisitic but I had a similar problem before I realized that the clocks were not well inserted into their sockets.If I recall, I think they were even inverted.

You can also check that the voltages are correct on the clock board.

 

[qusp]

yeah I get the feeling this is going to be one of those Fonzie moments

 

[necplusultra]

Another simiar problem I had was that my salas shunt was not givng enough current for the fifo and clock board. It was also powering the subu dac. Gave more current and all was fine.

 

[qusp]

5v is a bit low too

 

[karvid]

I just checked the clock and the legs are well inserted and in correct orientation.

I tried to rais the voltage to 6 VDC and it didn't make any different. The voltage to both clocks is 3,286 VDC in both cases (5VDC or 6VDC in) and the same for both clocks.

 

[karvid]

Forgot..
I also checked the frequency setting jumpers and they have the correct setting according to manual.

 

[Adrculda]

primary 2x115V Secondary：6V 1.25A x 2, 12V 1.25A x 2, 5V 1A x 4, 9V 1.5A x1

I use encoder for volume control

I assume those are AC not DC.
What type of encoder are you using ??

I was looking at 2 push type... one for volume control with push to mute and the second would have been source selection and on/off, however I think that would require the adruino to be on constantly and would have to figure out how to kill the display back lighting then.

 

[bigpandahk]

Yes, those are AC.

See here INTRO H i F i D U I N O you will have most of the information.

I modified the code to include the power on/off function. DQ828 had demonstrated how to control the backlight LED http://www.diyaudio.com/forums/digital-line-level/212747-build-thread-tpa-biii-ian-async-i2s-fifo-opc-ntd1-salas-sslv-23.html#post3198670