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  #381  
Old 09-01-2011, 12:18 PM
eroarex eroarex is offline
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Originally Posted by NwAvGuy View Post
Where are you located Rapide? There's now a European Group Buy for a complete kit.

A lot of DIY projects require purchasing from 3 -5 sources. A major goal for the O2 was to have everything on the board available from Mouser to save on shipping costs--at least in North America. For those outside North America, the group buys (so far one for Europe and one for Australia/New Zealand) should help a lot.
thanks a lot for this, just ordered the pcb from oli and the kit from jokener, thanks again, and i'm eager to test this amp myself

p.s. i've read the comments about the super fi 5pro, sadly i don't have them anymore i currently own senns ie8 and hd238 and a sansa clip to go with them and looking forward to something big like a hd650 or a hifiman he300 or he4, which i hope the amp can cope with
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  #382  
Old 09-01-2011, 12:40 PM
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Originally Posted by eroarex View Post
looking forward to something big like a hd650 or a hifiman he300 or he4, which i hope the amp can cope with
I own the HD650 and the O2 drives them with ease. Some of the HiFiMan cans, however, are right at its "design limit". They're among the most difficult to drive headphones I could find anywhere.

I would suggest waiting to see what other users report with their HiFiMans, and taking into consideration how loud you like to listen, before you buy any of their more power hungry headphones. I'm working on a new article for my blog that goes into this topic in much more detail.
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Last edited by NwAvGuy; 09-01-2011 at 05:02 PM.
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  #383  
Old 09-05-2011, 12:56 AM
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Originally Posted by eroarex View Post
senns ie8 and ... sansa clip
Slightly off topic, but its a great combo isn't it

Can't wait to get the parts to put an O2 together. Lots of group-buy threads on DIYaudio.
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  #384  
Old 09-05-2011, 12:43 PM
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The DarkSide The DarkSide is offline
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I got a PM from someone in this thread, and it was accidentally deleted - please PM me again. Thanks!!!
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  #385  
Old 09-06-2011, 11:59 PM
upstateguy upstateguy is offline
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Gearing up for mine....

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  #386  
Old 09-07-2011, 12:35 AM
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I demand build pics
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  #387  
Old 09-08-2011, 09:23 PM
axon01 axon01 is offline
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Did something happen to the reviews at HF?
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  #388  
Old 09-08-2011, 11:53 PM
Mid-Fi Mid-Fi is offline
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The two review threads that I read are still there:
Review: NwAvGuy's O2 DIY Amplifier by Shike
and
Objective2 Mini-Review by Maverickronin
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  #389  
Old 09-11-2011, 06:40 PM
SpaceTimeMorph SpaceTimeMorph is offline
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Another review for you guys: http://anythingbutipod.com/forum/sho...294#post574294
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  #390  
Old 09-15-2011, 12:27 PM
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Default Update & Full Size Photo

First, a big thank you to SpaceTimeMorph for his excellent review!

I received the final (fourth) round of prototype O2 PCBs, built up an amp, and it's the best revision yet. A few more little tweaks were made to allow using different battery terminals and making it easier to "socket" the gain resistors so they can be changed without soldering. The board is officially fully released. The baby has left the nest.

There's a bunch of revised information in the O2 Resources section including some new recommendations for wall transformers and a few other tweaks. There's also a potential group buy for front panels you might want to check out.

The group buy for the PC boards closed a few hours ago. Oliver is buying at least 750 boards! Several have asked if that's a new record for a DIY group buy.

A few asked for a high resolution shot of the PCB so here's the final board (hastily soldered together in a rush):


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  #391  
Old 09-16-2011, 04:50 PM
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That is a thing of beauty...
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  #392  
Old 09-16-2011, 05:31 PM
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Does look cool I don't know to much about (amps/whatever) but it looks nice.
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  #393  
Old 09-17-2011, 07:37 AM
koolkat koolkat is offline
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Beating the crap out of RSA, at a fraction of the price.
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  #394  
Old 09-22-2011, 04:46 PM
msjjr msjjr is offline
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Hi. I've just come across this thread and I would love to get one of the boards as well. I'm in the Toronto, Canada area and I'm not part of a group buy at all. Can anyone tell me how to acquire one, or is it too late? BTW, I'm not a DIY'er so I can't build one myself. Thanks.
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  #395  
Old 09-23-2011, 10:41 AM
Mid-Fi Mid-Fi is offline
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Quote:
Originally Posted by msjjr View Post
Hi. I've just come across this thread and I would love to get one of the boards as well. I'm in the Toronto, Canada area and I'm not part of a group buy at all. Can anyone tell me how to acquire one, or is it too late? BTW, I'm not a DIY'er so I can't build one myself. Thanks.
MrSlim in Ottawa was making and selling 02 amps. It looks like the offer is now closed but you might consider contacting him and see if he has any spares.
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  #396  
Old 09-24-2011, 03:43 PM
msjjr msjjr is offline
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Thanks. I did PM him already, but hadn't received a response (yet) and I thought I'd ask here. Thanks.
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  #397  
Old 09-24-2011, 07:42 PM
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Limp Limp is offline
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DIYaudio.com is where it's happening.

All group buys are now closed, but it wouldn't surprise me if another were to start shortly, the interest has been amazing.

Ollie, who did the initial run, ordered a few hundred extras to sell to people arriving a bit late. Sign up and ask if he's still got boards unspoken for.

Linky

Last edited by Limp; 09-24-2011 at 07:54 PM.
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  #398  
Old 09-24-2011, 10:36 PM
msjjr msjjr is offline
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Thanks for the help.
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  #399  
Old 09-26-2011, 05:33 PM
MrSlim MrSlim is offline
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Originally Posted by msjjr View Post
Thanks. I did PM him already, but hadn't received a response (yet) and I thought I'd ask here. Thanks.
Sorry, I've been busy elsewhere.. and didn't think to check my PM's here.
I just replied to you
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  #400  
Old 10-04-2011, 10:04 AM
mrcl_kk mrcl_kk is offline
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Default Input stage overload

@NwAvGuy: Does the use of the low power op amps affect the calculation for input overload (5/X for battery 7/X for AC)?

Building the O2 will be my first DIY experience, but I'm affraid it will be unnecessary to build one in the first place because of the haedphone I use.
I use Grado headphones and notice others to use a headamp for them. But the way I see it, I wouldn't have to use one for the lack of gain of for instance my Ipod (or anything else but an Ipod). Are there other diffirences then just the low output impedance of the O2 that will affect the sound?
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