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Old 30th May 2012, 01:28 AM   #21
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I did find out more information on the proper way to install Odac board into O2. It looks like the above info is also wrong. As the odac is supposed to automatically disconnect when you plug in any other input, and it will not as installed above. I read this on another forum. (Bada Bing, from Head-Fi)
If you wire directly to P1 pads, the ODAC is hard wired to the input of the amp all the time.
If you wish to have the input switch built into the input jack socket function, i.e jack in an
external source disconnects the ODAC, jack removed connects the internal mounted ODAC,
then you must cut the traces and wire to pins 3 & 4 on the underside of the O2 pcb
for L & R out of the ODAC.

If you wire the ODAC directly to P1, a potential problem is if you connect an external source
and forget and also have the ODAC powered and playing as well. This wires the
outputs of the two sources directly together. The two sources
will "fight" and over draw current from one or the other with potential damage.
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Old 30th May 2012, 01:47 AM   #22
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ODAC "crammed" inside B2-080 case with Objective 2 amp with batteries still in tact. The pics are of a test fit, I have not burnt any solder yet. The inductor and the micro usb port do make conntact with the case botttom(not sure if this is an issue)?, its a tight fit with some filing of the ODAC pcb it would fit slightly better.

They upside of this for me is retaining battery operation. I'm not clear on how to wire this to retain the input jack or what type/gauge of wire to use. Any advice is appreciated.
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Last edited by thirdman; 30th May 2012 at 01:56 AM.
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Old 30th May 2012, 04:27 AM   #23
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Quote:
Originally Posted by Dufus View Post
Which Audio GD dac do you have?
NFB-3
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Old 2nd June 2012, 03:44 AM   #24
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Quote:
Originally Posted by igor0203 View Post
NFB-3
I feel the same way -I've got an Audio-gd Fun, WM8471 DAC installed and I find I prefer the ODAC so far.
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Old 4th June 2012, 02:33 PM   #25
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Just got my new oDAC up and running. I mounted it on a small piece of plywood and fed it from an ancient laptop running Voyage mpd (also new).

The DAC feeds my Pass BA-3 and F4 via an old passive control unit.

Gain is a bit low, but it sounds great. It's the first time I've heard 24/96 music on my main system, and it's fantastic.

The main overall change I notice from other sources is the delicacy and smoothness of violins and other high frequency content.

Long term I hope to do an Alix / Voyage server with the oDAC in a box as my primary (non-vinyl) front end.

mpd is controlled with mpod on my iPhone - its great to be able to find all my music from my chair!

Tim
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RC Preamp (in progress), DIY Silver cables, Open Baffle BOFU, DIY subwoofer, GainClone, o2 Headphone Amp
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Old 19th June 2012, 04:49 AM   #26
4nradio is offline 4nradio  United States
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I received my custom back panel for the O2 + internal ODAC board from Front Panel Express today. Both the front and the back panel are of my own design, using FPE's software.

As mentioned by others, flipping the ODAC board upside down and mounted below the O2 PCB results in a tight fit, but retains uses of the batteries. I added two RCA jacks for a line level ODAC output in case I want to send the audio to another amplifier.

Here's the result:
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Old 19th June 2012, 05:32 AM   #27
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Quote:
Originally Posted by timbarnes View Post
Gain is a bit low, but it sounds great.
I found that the apparent low gain was due to a setting in mpd. Getting plenty of gain now.

tim
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Townshend Rock III w/ DC motor, Hagerman Bugle 2, Naim CD5i, Voyage MPD, ODAC, MiniDSP, Pass BA-3 and F4, Parham Pi Sevens
RC Preamp (in progress), DIY Silver cables, Open Baffle BOFU, DIY subwoofer, GainClone, o2 Headphone Amp
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Old 19th June 2012, 12:46 PM   #28
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4n, very nice! I'm envious.
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Old 19th June 2012, 03:15 PM   #29
swalter is offline swalter  Switzerland
life is beautiful...
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yes, that looks nice 4n, well done
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Old 20th June 2012, 01:34 PM   #30
willmax is offline willmax  Australia
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Quote:
Originally Posted by 4nradio View Post
I received my custom back panel for the O2 + internal ODAC board from Front Panel Express today. Both the front and the back panel are of my own design, using FPE's software.

As mentioned by others, flipping the ODAC board upside down and mounted below the O2 PCB results in a tight fit, but retains uses of the batteries. I added two RCA jacks for a line level ODAC output in case I want to send the audio to another amplifier.

Here's the result:
That O2 with the RCAs coming out at the back plus ODAC is looking sweet.
What type of RCA are those?
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