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Gamma-2 (γ2) DAC Thread - Page 15

post #211 of 2109
7/25/09 at 11:29pm
I don't think there are fm's there. nichicon's though.

the grey box caps are vishay from mouser (1uf). not red, but they were onhand

re: lighting, I do spend a little time getting it right, but one thing that cures a lot of evils is the 'shadow highlight' tool. it compresses down (either direction) and fixes a LOT of lighting problems.

also, never use flash. use available light and live-view to point lights off walls. this means a tripod is a must-have and a self-time to trigger itself is also needed.
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post #212 of 2109
7/25/09 at 11:41pm
yep that's what I do now, tripod and timer. I bought one of those natural light flourescents for the workbench and it does some better with a pic I took the other day.

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post #213 of 2109
7/26/09 at 12:57am
Quote:
Originally Posted by linuxworks View Post
gotta admit, I used the old flood-n-suck method on those 2 so28 chips. but it gets the job done with little hair-pulling

Got to try that method next time I solder one of those chips, always thought that there was a danger of removing to much solder from the joint but your photos show otherwise. Nice work!
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post #214 of 2109
7/26/09 at 1:18am
Congrats, linuxworks. That's very clean solderwork. You're the second person to ever hear a γ2, even before I soldered the first joint on mine!
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post #215 of 2109
7/26/09 at 1:22am
No he's not.
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post #216 of 2109
7/26/09 at 1:48am
OK, maybe I should've wrote "second head-fi'er". Significant others or pets don't count.
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post #217 of 2109
7/26/09 at 1:53am
lol, the cat won't come within 10 feet of my "office" after poking her nose in a CKKIII that I had forgot to put the lid on one night.
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post #218 of 2109
7/26/09 at 1:57am
By the way, in case anyone is wondering... The OPA2365 does not have a turn-on pop problem, despite what "hopeless" said.
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post #219 of 2109
7/26/09 at 2:58am
Quote:
Originally Posted by amb View Post
Congrats, linuxworks. That's very clean solderwork. You're the second person to ever hear a γ2, even before I soldered the first joint on mine!
I'm no stranger to that phenom. when I was developing the 'volumaster' code for the digital attenuator, another guy I was working with (rwhite) was the first to hear and see it work, even before me. I was writing code, sending to him, getting feedback and debugging until he said 'I hear sound!'. it wasn't until days later that I heard my own unit working
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post #220 of 2109
7/26/09 at 2:59am
Quote:
Originally Posted by amb View Post
even before I soldered the first joint on mine!
if you get to jonesin', you can take a hit off mine.

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post #221 of 2109
7/26/09 at 3:21am
Quote:
The OPA2365 does not have a turn-on pop problem
And the white noise when an unused S/PDIF input is selected is minimual...
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post #222 of 2109
7/26/09 at 3:39am
Quote:
Originally Posted by MisterX View Post
And the white noise when an unused S/PDIF input is selected is minimual...
confirmed, and then some. this seems to be a well behaved dac. I'm not sure there's any urgent (if any) need for external muting.
the dac I had just before this one (an ebay china special) had a relay for muting. an actual loud mech relay for when error==true and all that stuff.

sounds good, in theory, except when I run my media player (popcorn hour) and when you change programs or chapters or even go in/out of pause, you can trigger a mute and the relay starts clicking on you. it gets annoying!

this dac has no relay and while it has no external muting, it has no harsh problems while doing some video playback tests and while switch to/from audio (audio = 44.1, video = 48k). I downsample all my 5.1 stuff to 2.0 so that I can watch movies with a 'quality dac' and that means a stereo dac (lol).

so far, music and movies are fine with this dac. its now in place where the previous one used to be. I have a PGA vol control chip following the output of the dac and that works fine, also.

I had my y1 board build from a long time ago, and I didn't want to deal with making another just to have usb locally. I can convert usb to spdif and from then, spdif is just one of many spdif inputs that can be selected from. keeping it as that half top layer also lets me get access to the line-out jacks and put molex connectors there.

I was not planning on leaving them sandwiched like that, but I think I will, now. it saved me having to make a cable (lol).
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post #223 of 2109
7/26/09 at 4:12am
Actually my conclusion is a little hasty, I should have built at least one of the three Gamma 2 boards without the SRC4194 (or AD1896AYRS) to see how much of the white noise is being dealt with by the ASRC.
It looks like it would be pretty easy to add the ASRC and associated parts after the fact if one of the participants of the prototype group (with access to a scope) wants to try it.
You might save me from ripping all of that stuff back off one of the boards to test it.
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post #224 of 2109
7/26/09 at 8:11am
Quote:
Originally Posted by MisterX View Post
Actually my conclusion is a little hasty, I should have built at least one of the three Gamma 2 boards without the SRC4194 (or AD1896AYRS) to see how much of the white noise is being dealt with by the ASRC.
It looks like it would be pretty easy to add the ASRC and associated parts after the fact if one of the participants of the prototype group (with access to a scope) wants to try it.
You might save me from ripping all of that stuff back off one of the boards to test it.
I am doing just that on mine. I am leaving off the ASRC chip (along with everything else in the "optional" box as shown in the schematic) and test in that configuration, and then I will add those parts later.
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post #225 of 2109
7/26/09 at 11:26am
congrats on all the successful builds! It's exciting to see such good progress here
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