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Transports / Re: Raspberry PI transport with I2S output into TDA1541A
« Last post by dannydigital on December 14, 2019, 02:39:59 PM »
You are not quite understanding how the whole thing works.
As I pointed out in last post, the 'old' JLsounds board (that you have) reclocks all I2S signals with a discrete flip flop chip. From memory it was LVC (but can't recall exactly).
So in fact your I2S lines to DAC have only 1 LVC logic chip between clock and DAC. That's why it sounds so good.
Given this, the MUX switching chip could well make quite a difference. The only way to know is try.
The new board I2S has reclocking inside FPGA chip. I believe they take great care to keep jitter low but it won't be as good as a discrete FF logic chip.
Terry,
I understand exactly what you are saying wrt the differences implemented in the clocking o/p's of the two boards.
I'm not using the old board in this project.
Saving it for something else.
Ideally it would be best to have the USB board mounted right above the TDA1541 and extend the USB port to the rear panel instead but this is a retrofit project and I'm taking into consideration some practicality with the fitout.
Time to enjoy the results, using foobar2000remote on my phone. This is brilliant, it gives you full control of the system and allows full access in to the PC's directory structure. Can play whatever you have on your laptop, maybe network drives too, I will have to check this.
Fun fun fun!