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Old 8th February 2013, 09:07 PM   #3101
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I'm having a hard time identifying the capacitors especially the ceramic ones. Could someone help me out with this noob problem.

Thanks in advance!
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Old 8th February 2013, 09:23 PM   #3102
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gootee, have you had a look at the O2 layout? If yes, do you have any insight into RS's design? It seems to me that the output has caps placed nearby, but the voltage gain stage appears "naked" (though I didn't examine it as closely I could have). I don't remember RS blogging on this particular aspect of his design, at least in comparison with his other in-depth notes.
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Old 8th February 2013, 09:25 PM   #3103
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Quote:
Originally Posted by DevilsRightHand View Post
I'm having a hard time identifying the capacitors especially the ceramic ones. Could someone help me out with this noob problem.

Thanks in advance!
I'm not sure what you mean. What "identifying" are you asking about? Do you have the BOM?
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Old 8th February 2013, 10:40 PM   #3104
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Hi all, just after a bit of advice. I've built my O2 and was wondering if anyone knows how i can work out the gain resistor part of it.

I'm not after deafening sound but even on full volume its still not as loud as my phone for example. I am taking my output from a E-MU 1010pci sound card and the outputs not amplified like a ipod or 'normal' pc sound card.

Any help would be much appreciated.
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Old 9th February 2013, 05:48 AM   #3105
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oh goodie I can post another question.
Toxygene, what is the gain resistor configuration you've built into your O2?
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Old 9th February 2013, 02:21 PM   #3106
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Thanks for the reply.
I have used the standard ones from the BOM, 1k Ohm and 274 Ohm.
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Old 9th February 2013, 04:38 PM   #3107
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Quote:
Originally Posted by sofaspud View Post
I'm not sure what you mean. What "identifying" are you asking about? Do you have the BOM?
All the parts were in the same bag, so I had to check the values of each resistors, which is easy, but now I have 8 ceramic caps that I can't figure their values. Here's what I have:

4x with BC 221 on it
2x with BC 105z
1x 223 E1M
1x 213AFP

That's what is writen on them an I don't know what it means
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Old 9th February 2013, 05:42 PM   #3108
gootee is offline gootee  United States
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Quote:
Originally Posted by sofaspud View Post
gootee, have you had a look at the O2 layout? If yes, do you have any insight into RS's design? It seems to me that the output has caps placed nearby, but the voltage gain stage appears "naked" (though I didn't examine it as closely I could have). I don't remember RS blogging on this particular aspect of his design, at least in comparison with his other in-depth notes.
Where can I find the layout?
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Old 9th February 2013, 05:50 PM   #3109
6L6 is offline 6L6  United States
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Building the O2 Headphone Amp

In that link are a bunch of photos, and the first links on the top page take you to nwavguy's pages, which have all the info you will ever need about this project.
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Old 9th February 2013, 08:11 PM   #3110
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Quote:
Originally Posted by DevilsRightHand View Post
I'm having a hard time identifying the capacitors especially the ceramic ones. Could someone help me out with this noob problem.

Thanks in advance!
I was in exactly your position; I used a multimeter for the resistors and photographs for the capacitors.
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