[Garbz]

Who needs weekends

I went ahead and tried it. No sucess. Just so you know what i'm trying to do. I'm using a 74HC74 D type flipflop. The clock from the clock source, and the Data from the S/PDIF line. The output Q should have only the jitter inherent in the clock itself. This is what common reclocking circuits do.

There is a clock signal on that pin but whatever it is it's not the correct S/PDIF frequency. I'm not going to rule out that I've burnt out the flipflop with constant resoldering, or that I've set up something incorrectly but I will experiment further. Thistime on the weekend

.

Could you do me a favor since I don't actually have a frequency counter or ocilliscope (which would eliminate the guess work). Could you please check the frequency output of the S/PDIF signal? R5 on the schematic or Pin 5 from bottom left. in Bryan's pic.

 

[hangguy]

Hi Garbz,

Now I see what you are trying to do.

A frequency counter would not be able to tell you the freq of your SPDIF data, since it only count edges in a period of time. As the SPDIF data changes so is the freq reading from the freq counter, although the sampling freq does not change.

Let me study the datasheet of 4584 over the weekend and see if this reclocking scheme is doable.

Mike

 

[bryman79]

Any idea what D1's purpose is? I just received the next Transit to mod... it's a rev. F, with the only noticeable difference being the diode.

Thanks,
Bryan

 

[Garbz]

Noticable difference. Who knows what other changes they made

But now that you mention it it does seem kind of out of place. Maybe they realised they simply didn't need it

 

[bryman79]

Garbz,

They added the diode going from rev. F (the one I just received) to rev. G (the one you see in the pics).

Regards,
Bryan

 

[Garbz]

Well on that note maybe it was missing

Anyway I gave up with the flipflop. There's no clock i can source that seems to work. I'll just go the standard voltage divider cap, the input is to my dac is xformer coupled so i'll leave that out.

 

[perco]

Is the twisted red and black cables the power mod? Just solder the cables like you did and supply them with +5V and GND? How about the USB power? No problem with sound card needing the USB ground from the computer?