The Objective2 (O2) Headphone Amp DIY Project - Page 183 - diyAudio
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Old 10th January 2012, 02:16 AM   #1821
agdr is offline agdr  United States
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Quote:
Originally Posted by HiGHFLYiN9s View Post
Just finished up my build. Unfortunately, both mini jacks are shorting out. Any recommendable substitutes that will fit (eg: Neutrik, Switchcraft)?
Here is the same jack from CUI, a different manufacturer, via Digikey:

Digi-Key - CP1-3555NG-BE-ND (Manufacturer - SJ1-3555NG-BE)
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Old 10th January 2012, 04:25 AM   #1822
br777 is offline br777  United States
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what the? well i'm kind of stunned right now. I was playing around and decided to go directly from my motherboard's soundcard 1/8" out into my O2.

I would never do this with other amps b/c the noise is quite audible but to my amazement its totally silent.
on low gain i can turn the volume all the way up with NO noise at all, on hight gain i have to go to about 12 oclock before i start to hear minimal noise, which would probably blow my eardrums with music on.

what is it about this amp that makes it so insulated from computer noise?
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Old 10th January 2012, 05:01 AM   #1823
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Quote:
Originally Posted by br777 View Post
what is it about this amp that makes it so insulated from computer noise?
Two things that I can think of: high input impedance of 10kΩ and a real ground plane with the audio's common dumping into it... which is also attached to the aluminum enclosure of the amp.
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Old 10th January 2012, 05:40 AM   #1824
jfrana is offline jfrana  United States
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Default Full gain left channel, attenuated right channel

This is my first diy electronic project. It was fun. Everything is together, measurements looked good, plugged in headphones and source -- all good. Pressed play on source (an ipod), full volume left channel not effected by volume knob, right channel seems to work fine. I am slowly trying all the diy tests again and making my way through the more in depth tests.

Since I am new -- I am not confident that I would know what measurement was out of whack unless the "details" page has the measurement value explicitly.
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Old 10th January 2012, 06:06 AM   #1825
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Look for a solder bridge under the pot, it might be that simple
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Old 10th January 2012, 08:38 AM   #1826
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Guys, i need some help....
I'm starting my second try of build a headphones amp...the first try i make one by my own...but never finished it...so i opted for a DIY one....eheh

I already buy this material:
Kilo Intl ML-50-6MM Clear Knob
Machined O2 Front Panel
O2 Printed Circuit Board

Now i need to buy the components and a B2 case....someone can knows were can i buy a complete kit of components and this case...? I'm from portugal BTW...


Thanks
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Old 10th January 2012, 11:16 AM   #1827
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I really enjoy this amp. I have a question for RS.

Would it be possible to feed the amp with DC, mainly to charge the batteries. I don't mean necessary on the onboard AC connector, I could tap someware and add an extra DC input.

I ask because small switching psu are much lighter than transformers, and I use the amp when I am travelling. I use it almost aleays on batteries and connect to AC only to recharge.

Thanks,

Davide

Sent from my N-04C using Tapatalk
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Old 10th January 2012, 05:44 PM   #1828
pby is offline pby  United Kingdom
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Quote:
Originally Posted by CrustyD3mon View Post
Guys, i need some help....
I'm starting my second try of build a headphones amp...the first try i make one by my own...but never finished it...so i opted for a DIY one....eheh

I already buy this material:
Kilo Intl ML-50-6MM Clear Knob
Machined O2 Front Panel
O2 Printed Circuit Board

Now i need to buy the components and a B2 case....someone can knows were can i buy a complete kit of components and this case...? I'm from portugal BTW...


Thanks
Have you tried Farnell? You can try uploading the BOM, though it'll take a day. The b2 case seems to be listed as US stock so you may want to try ebay to avoid the fee.
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Old 10th January 2012, 06:01 PM   #1829
QRikard is offline QRikard  Sweden
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Quote:
Originally Posted by Nikon1975 View Post
I really enjoy this amp. I have a question for RS.

Would it be possible to feed the amp with DC, mainly to charge the batteries. I don't mean necessary on the onboard AC connector, I could tap someware and add an extra DC input.

I ask because small switching psu are much lighter than transformers, and I use the amp when I am travelling. I use it almost aleays on batteries and connect to AC only to recharge.

Thanks,

Davide

Sent from my N-04C using Tapatalk
If you prefer to have everything finished take a look here. Jokener took care of the first GB for europe and now he has another GB up and running for late comers.
O2 Amplifier Kit & PCB Groupbuy, Worldwide

EDIT:
agdr, True, i haven't checked that thread since the start...
Had forgotten about that, should probably try to get a hold of him as well because i'm two boards short.

Last edited by QRikard; 10th January 2012 at 06:24 PM. Reason: Misstake, see EDIT:
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Old 10th January 2012, 06:02 PM   #1830
agdr is offline agdr  United States
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Quote:
Originally Posted by CrustyD3mon View Post
Now i need to buy the components and a B2 case....someone can knows were can i buy a complete kit of components and this case...? I'm from portugal BTW...
Well I was going to suggest Jokener's worldwide group buy. I just had a look at that thread, which I hadn't gone back to in awhile.... looks like that is why you are back here! Try jtktam in Canada. He is selling kits too. The last few posts have prices and says he will do it worldwide:

o2 parts canada

EDIT: QRikard - looks like we were both composing at the same time! Check out the last few posts in Jokener's thread - something has happened, it seems...

Last edited by agdr; 10th January 2012 at 06:06 PM.
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