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Old 25th August 2011, 05:39 AM   #201
Variac is offline Variac  United States
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Quote:
Originally Posted by Earfanatic View Post
You need to plate that copper before starts to oxidate ...
Anyway I like it very much!
There is a lacquer called Incrylac or something close to that, that keeps copper based metals unoxidized, although regular lacquer works for a while..
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Old 25th August 2011, 04:22 PM   #202
MoonL is offline MoonL  Hong Kong
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3rd day work of my friend
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To be continuous.....
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Old 25th August 2011, 04:53 PM   #203
MoonL is offline MoonL  Hong Kong
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After listern to O2 for a few days, I would like to write more about my feeling on it. This time, I want to compare the performance O2 to the AMP I am using (a DIY AMP made by me, and I call it HM-1).

Just share my work, HM-1.
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The first impression of listerning O2 is, 'power' of it is enough, it can drive ER4S and HD600. But when compare with the performance of HM-1, for me, performance of ER4S and HD600 is better when using HM-1, and the sound details is more in HM-1.

However, it is not fair to compare O2 with HM-1. Because I am using 33.6V on HM-1, and the IC used is much more expensive. Once again, O2 is a very good AMP, performance of it is much much better than the AMP in same price level. It is not difficult to build such a wonderful AMP, everyone can enjoy it, especially for the newbie on DIY AMP.

P.S. O2 is quite hit in Hong Kong now, many people want to build their own O2.
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Old 25th August 2011, 05:10 PM   #204
Alexium is offline Alexium  Ukraine
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Quote:
Originally Posted by MoonL View Post
the IC used is much more expensive.
Which is that (if that's not a secret, of course)?

Last edited by Alexium; 25th August 2011 at 05:13 PM.
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Old 25th August 2011, 05:11 PM   #205
Alexium is offline Alexium  Ukraine
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P.S. MoonL, did you perform blind or sighted comparison with O2?
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Old 25th August 2011, 05:12 PM   #206
MoonL is offline MoonL  Hong Kong
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Quote:
Originally Posted by Alexium View Post
Which is that (if that's not a secret, of course)?
Finally, I am using OPA627BM x 2 and OPA111BM x 2 on HM-1..
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Old 25th August 2011, 07:46 PM   #207
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A fairly complete review of the O2 has been published by a former Mini3 and Schiit Audio Asgard owner. He rather liked it with all his headphones. His main criticism is it's too big to "wear" on your person (which unless perhaps you're wearing a winter coat I have to agree with). My idea of "portable" is something to have in my backpack for travel, airports, the cafe, backyard, park, etc. His review (sorry for linking to Head-Fi):

NwAvGuy's O2 DIY Amplifier
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Last edited by RocketScientist; 25th August 2011 at 07:49 PM.
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Old 25th August 2011, 08:58 PM   #208
MrSlim is offline MrSlim  Canada
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RocketScientist, do you think there would be any issue with socketing the gain resistors? I was thinking of doing that for the people I am building for, so that they could change the gain at a later date depending on the headphones they are using. Using individual pin sockets would only raise the resistors up 2-3 mm..
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Old 25th August 2011, 09:08 PM   #209
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MrSlim, that's an interesting idea for an optional upgrade.

As long as the pins will fit the 28 mill holes in the board, and grip the fine gauge 1/8 resistor leads, it would probably be OK. I've put some 1/4 watt values in vertically during prototyping and didn't see any notable change in performance. If any of those four resistors goes open circuit due to a bad connection, the O2 just drops to 1X gain.

If you have a Mouser part in mind for the pins, please share the part number and I'll throw some on my next order and check it out.
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Last edited by RocketScientist; 25th August 2011 at 09:17 PM.
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Old 25th August 2011, 11:00 PM   #210
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Switchable gain would be most welcome.
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