[guzzler]

Easiest way to tell the caps apart is to count them

100nF in multiples of 4
33pF in multiples of 2
10nF in multiples of 1

g

 

[Garbz]

Do i need to point out I already assembled the board, it doesn't take a genious to count caps.

Although on ur website the count says 5 100n caps were needed, but I only got 8 with my order of 2 boards. That took a bit of extra thinking

 

[guzzler]

Quote:

Originally Posted by Garbz Do i need to point out I already assembled the board, it doesn't take a genious to count caps. Although on ur website the count says 5 100n caps were needed, but I only got 8 with my order of 2 boards. That took a bit of extra thinking

I know, I was just passing on the knowledge

There were 5 SMDs needed originally, but I changed one of them for a box type cap in the coax conversion stage

g

 

[dsavitsk]

Quote:

Originally Posted by Garbz Although on ur website the count says 5 100n caps were needed, but I only got 8 with my order of 2 boards.

Don't blame Gus, he has no control of the website. I'll fix it one of these days.

-d

 

[phobus]

Is there anywhere other than digikey where I can buy a 2902? They won't have them in stock until 5/31

 

[Garbz]

My bad i thought Gus ran it.

The 2902 is available from Digikey as well, or directly as a sample from texas instruments if you qualify.

 

[individual6891]

Quote:

Originally Posted by Garbz The 2902 is available from Digikey as well, or directly as a sample from texas instruments if you qualify.

Quote:

Originally Posted by phobus They won't have them in stock until 5/31

 

[aswils]

Sorry to be such a feeb but where exactly do the spdif leads attach?

 

[Bas Horneman]

Quote:

Sorry to be such a feeb but where exactly do the spdif leads attach?

Check out http://www.ecp.cc/usb-spdif.html

my guess is that they would connect to the out connectors. (not being sarcastic. it's just that I don't have the schematic. And that seems the likely place)

 

[aswils]

Dope slap to head. Thanks Bas I looked and looked but obviously overlooked the "out" arrow.

 

[Garbz]

Sorry i meant Mouser but that would have been a load of crock too. Just disregard my rambelings.

 

[dsavitsk]

I can't believe nobody has mentioned this yet ...

The suggested USB jack included in the original parts list (DigiKey part WM17109-ND) does not fit the board ... or rather, it fits the board but extends back and touches the pins of the voltage regulator and 3 resistors. As you might imagine, this is not good. It is possible to lean it forward to avoid this, but it has been replaced on the pats list by a part (AE1085-ND) that fits better. Here is the technical drawing if you want to convince yourself that this part is the better choice.

-d

 

[Garbz]

well my order from mouser was only just released today, but a quick show of hands will probably indicate that not many people have finished it yet

 

[dsavitsk]

A couple more things ...

The parts list suggested using 2 22uF caps while the board says to use 10uF caps. If you already have the 22uF caps, they should not cause a problem, but they have been replaced on the parts list with 10uF panasonic FC's.

If you are using tantalum 1uF caps instead of the Wimas, please note that the tantalum caps are polarized. To figure out how to install them, each position has one leg toward the 2902, and another to the ground plane. Connect the positive (+) leg of the cap toward the chip and the negative (unmarked) to the ground plane.



I built one and plugged it into the computer. No errors, no smoke, etc. I didn't hook it up to a DAC yet to see if there is a signal as I am waiting on some wire to do this with.

 

[guzzler]

Hi all, just to clarify ds' post above

The tantalum +ve side goes to the side from which the traces come from the 2902 (not a via), and obviously the negative side goes to the other pad (which is a via, and is cross-hatched underneath)

g

PS, anyone working yet??