[cobaltmute]

Quote:

Originally Posted by Billyk /img/forum/go_quote.gif Fully functional and sounding great. Stand alone (sorry forgot that) No case, taped to a bit of pink static foam to protect the bottom. Wired to a 3.5mm jack. Not a cable type, has USB plug mounted. Did not see any errors or warnings in the event logs. USB states unknown device, power draw 100ma

Remove the static foam - it is conductive.

If the USB is stating 100mA you are ok. If it actually measured, that is bad. The PCM2707 will report 100mA use to the host, but the grubDAC doesn't draw that much.

 

[Billyk]

Yeah, reporting not measured.
Non conductive, pink foam. Removed it anyway. No love.
Must have fried the chip somehow. It is very dry here, static could be the culprit. Shoulda cased it but did not have one and wanted to play with it. When/if I have some spare $$ I'll get another 2707, Mouser is out until April, would a 2706 work?

 

[cobaltmute]

Without being able to see the data stream, yeah it looks like it may be a PCM2707 issue.

As for using a PCM2706, it is reported as being compatible for the PCM2707, but I personall haven't tried it - yet. That will be hopefully within a week.

 

[Billyk]

Thank you much. I appreciate all your time and input.

 

[gurusan]

This looks like a really great project....thanks so much for all the effort.

 

[gurusan]

I have just soldered together the grubDAC, but I bridged 2 pins on the PCM2706 DAC and can't seem to get it right! Any tips?

I have purchased some .8mm solder braid and a new solder tip as mine is crapola but those won't be here for a day or 2.

Anyway it looks awesome lol, soooo tiny. I just wish I could fix this solder bridge!

 

[pistolsnipe]

lots of flux, wipe your tip off on a damp sponge then draw it across the bridge from the chip out, holding the tip as flat to the pins as you can (ie connecting to as many as possible), done in a jiff. i always get bridges on smd qfps, and they come right off

 

[cobaltmute]

That looks like a lot of solder on that bridge, but you can try pistolsnipe's technique.

I always get bridges. I drag down the pins to the pads to get the bridge off the pins and maybe spread it out on the pins. I'll also try dragging the bridge across the pads to spread out the amount of solder on each pad (again drag down the pins to the pad). Last resort when it won't go away is to use braid.

 

[descendent87]

Can you buy the PCB from any UK sites? Just wondering as delivery would be quicker.

 

[cobaltmute]

The only place that will have the board will be Beezar.

 

[gurusan]

Well I used the flood and suck method to repair the solder bridge and it worked! The USB works great and sounds lovely! There is some background noise noticeable at higher amped volumes which changes when I move the mouse and such though. Anything I can do about this?

 

[cobaltmute]

What are you driving? Is it headphones direct or an amp? And what kind of headphones?

 

[keyid]

see if you still hear the sound after you turn off your monitor.

 

[gurusan]

Monitor has no effect on the sound

 

[cobaltmute]

Is your mouse a USB mouse? Could be an internal hub is sharing power.