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Old 25th February 2013, 04:55 AM   #21
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The BOM list what positions on the board the parts need to be soldered. The pcb boards have silk-screened labels for all positions.
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Old 25th February 2013, 07:19 AM   #22
agdr is offline agdr  United States
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Quote:
Originally Posted by RugbyPlayer View Post
Thanks for that. i am hoping to DIY it. The thing i still cant seem to find is a schematic that tells me where everything needs to be put.

Do you know anything about this kit posted here? O2 Headphone Amplifier Full Kit
The schematic is here: https://docs.google.com/file/d/0B52A...hl=en_US&pli=1 same deal, file->download to open or download a PDF. But like shadow419 says, the boards are silkscreened so all you really need is the BOM.

That amp kit is Head-N-HiFi, the second link I posted. All 4 of those outfits (last I checked anyway) offer the bare PC board, parts kits, and soldered-together finished units. You can choose if you want to DIY it or buy one assembled.
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Old 25th February 2013, 10:39 AM   #23
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Quote:
Originally Posted by RugbyPlayer View Post
Thanks for that. i am hoping to DIY it. The thing i still cant seem to find is a schematic that tells me where everything needs to be put.

Do you know anything about this kit posted here? O2 Headphone Amplifier Full Kit
I bought pcb, case and component pack from headnhifi, I already had a power supply and I didn't need the batteries. (Was fitting an ODAC in the case), very economical and good service, so I imagine the full kit will be very good.
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Old 24th May 2013, 02:42 PM   #24
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Hello,

My first post here, have ordered the PCB from JDSlabs [awaiting delivery] will be back with queries and posts related to my build and experiences.

Cheers
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Old 29th May 2013, 02:06 PM   #25
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I am finding it difficult to find clear examples on the correct installation of the ODAC.

I realize there are pictures on the RS blog, but I'd really appreciate a series of photos that show exactly how the wires are connected between the two boards. This way, I'll know exactly what to do.

Has anyone seen this somewhere?
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Old 31st May 2013, 02:05 AM   #26
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Quote:
Originally Posted by fineaudiolover View Post
I am finding it difficult to find clear examples on the correct installation of the ODAC.

I realize there are pictures on the RS blog, but I'd really appreciate a series of photos that show exactly how the wires are connected between the two boards. This way, I'll know exactly what to do.

Has anyone seen this somewhere?
Here's a guide:
http://www.jdslabs.com/pdf/Instructions_ODAC_DIY.pdf
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Old 31st May 2013, 02:55 PM   #27
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Thanks John! That's a good guide but I'm still not feeling very confident about understanding what's going on in method 2, step 6 and 7. The pictures are very small and what's happening with the ground wire/wires? is a bit sketchy to me.

What would be really be awesome are some high res photos for method 2 of the soldered wires and cut traces on the O2 board together with a photo of the mounting on the ODAC board.
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Old 28th July 2013, 08:05 PM   #28
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Hi!
I've build my own O2. And I've some trouble...

Click the image to open in full size.

The amp sound like "mono". It "sum" left channel with right channel, and the common part went "masked", silenced.
In a stereo song, like a "karaoke"...

If i feed it with "mono" music, nothing come out...

What's wrong???
What can I test?

(sorry for my poor english...)
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Old 29th July 2013, 12:38 AM   #29
dfy is offline dfy
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This sounds a lot like a disconnected signal ground: What is it that strips vocals from audio when a 1/8" audio jack is partially unplugged? - Electrical Engineering Stack Exchange
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Old 29th July 2013, 09:08 PM   #30
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Quote:
Originally Posted by dfy View Post
Thanks!!!!
It was the line-out cable!!! LOL!!!

I've found the broken ground, but not into the ampli!!!

Thanks
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