Gamma-2 (γ2) DAC Thread

[MisterX]

Right.
I would be more inclined to follow where beefy is leading you... the log does indicate the PCM270X is "rebooting" (which is what would happen if the VBUS drops low enough that the host pin thinks the USB was disconnected from the computer).
Can you just restart the media player or do you have to unplug the USB cable and then plug it back in (to make it play music again)?

 

[amb]

Should be fine.

 

[ksnider1]

Quote:

Originally Posted by MisterX /img/forum/go_quote.gif Right. I would be more inclined to follow where beefy is leading you... the log does indicate the PCM270X is "rebooting" (which is what would happen if the VBUS drops low enough that the host pin thinks the USB was disconnected from the computer). Can you just restart the media player or do you have to unplug the USB cable and then plug it back in (to make it play music again)?

Just restarting player works, I don't have to unplug USB cable.
I have Full++ with Y2, for testing purpose can I short 1-2 on JP2D now ?

 

[Beefy]

Sorry, I'm thinking of the wrong pin on the PCM2707...... HOST pin is the one that is probably dropping, located before U2U.

 

[amb]

Quote:

Originally Posted by ksnider1 /img/forum/go_quote.gif I have Full++ with Y2, for testing purpose can I short 1-2 on JP2D now ?

I wouldn't advise this, because you'd be shorting around circuitry within the TPS2115A power mutiplexer.

 

[ksnider1]

here is pic of my Y1++ if that helps, it's not best quality. Here is pic of my multimeter it's from my younger days.

 

[fishski13]

ksnider1,
when the music stops, does the illuminated switch turn a very faint red?

 

[ksnider1]

Quote:

Originally Posted by fishski13 /img/forum/go_quote.gif ksnider1, when the music stops, does the illuminated switch turn a very faint red?

it's not fainted red, it's red like there is no signal. I can make pic tomorrow.

 

[fishski13]

Quote:

Originally Posted by ksnider1 /img/forum/go_quote.gif it's not fainted red, it's red like there is no signal. I can make pic tomorrow.

i had a couple of glitches tonight with my o-11 powered y-2 off a dedicated hi-fi mains/AC circuit. no freeze ups, just very brief drop-outs and a concurrent brief flickering of green to red. my furnace and spaceheater have been working overtime. -10F tonight, and i'm not sure what the windchill is.

 

[Volkum]

Hi guys,

I finished my y1 full++ config earlier in the night and it's working great (tested optical and USB) after I tracked down bad joint in U2, however my y2 board doesn't seem to output any sound. The y1 board works independently and when mated with the y2 board, however when the boards are mated, I get no sound out of the 3.5mm jack on the y2 board (3.5mm jack on the y1 still works--are these supposed to work simultaneously?). I reflowed most of the points on the bottom of the board. I also reflowed U4, U5, and U7 twice with no luck.

Voltages with USB power (I don't have a separate PSU suitable for this at the moment):

3.3v - 3.29
5v - 5.01
4.5v - 4.72 (TPS793475)

Any ideas on how I can narrow down the issue?

Pics:




(sorry for the poor photography--not my specialty)

 

[amb]

Volkum, did you install the correct part in U3? Should be a MCP100, not MCP101.
Other than that, use a loupe or other visual magnification to inspect for solder bridges between IC pins, particularly U4 and U5, and check the joints at X1.

 

[Volkum]

Quote:

Originally Posted by amb /img/forum/go_quote.gif Volkum, did you install the correct part in U3? Should be a MCP100, not MCP101. Other than that, use a loupe or other visual magnification to inspect for solder bridges between IC pins, particularly U4 and U5, and check the joints at X1.

U3 has MCP100 installed. I'll give those components another look over tomorrow or Saturday--I've looked them over so many times tonight that I'm possibly cross eyed now lol.

 

[francisdemarte]

I had a similar issue and it was X1. I had a hard time getting a good joint and not shorting it out.

 

[Volkum]

Quote:

Originally Posted by amb /img/forum/go_quote.gif Volkum, did you install the correct part in U3? Should be a MCP100, not MCP101. Other than that, use a loupe or other visual magnification to inspect for solder bridges between IC pins, particularly U4 and U5, and check the joints at X1.

Quote:

Originally Posted by francisdemarte /img/forum/go_quote.gif I had a similar issue and it was X1. I had a hard time getting a good joint and not shorting it out.

It was X1! Woot!

 

[madstudio]

Hi guys, i searched and tried to read 92 pages to find out what do I need if I want to use Y2 with just SPDIF (preferable AES) input but I'm still not sure about. So, the Q is : do I need Y1 board for that? Is it possible to make it work with AES input standalone? Thanks