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Old 30th August 2011, 02:31 PM   #11
timpert is offline timpert  Netherlands
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Jokener,

RS has the volume potmeter. As above, I'd opt for the 15A taper, which has part no. RK09712200HA.

The knob is something I won't fret about, the local electronics store would carry something that is perfectly fine.

The TDK thing is not a resistor, it's an X7F ceramic capacitor. Any cap with the same dielectric characteristic (i.e. X7F), capacity, voltage rating and lead pitch should substitute for it.

The 7812 is a generic part, and is carried by a large amount of suppliers.

If you offer to hold the GB, I'd jump on that offer immediately!

Regards
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Old 30th August 2011, 02:54 PM   #12
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If there will be GB add +1 from me
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Old 30th August 2011, 03:25 PM   #13
Jokener is offline Jokener  Germany
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Yeah, I noticed the resistor/capacitor error as soon as I had posted it. Its fixed now, but thanks for noting it.

About the knob: They have a boatload at my dealer, but I'll take another look tomorrow.
Personally I'll jump for the black anodized aluminum version with colored indicator, but there's just one in stock and its 12,99€'s ^^
So for a GB, I'd choose something black/grey with a white/colored(?) line for 1€ or so.

As the capacitor is non-critical (according to NwAvGuy's BOM), I selected a replacement from RS.
That way I can keep the number of suppliers as low as possible.
They only have 120 of them in stock (0,2€/piece), but thats good for 60 O2's...
If insufficient, I'll check with my local dealer.

The only thing that irritates me about the 7812 is that my local dealer only has the 7812CT part number listed and no 7812CTG.
I'll find out whether there is a difference or what the difference is.
The datasheet that my dealer has does not mention a CTG, so I'll see.

The Alps is sourced from RS, they are the only shop I could find that has more than 20 in stock.

Anyway, do I have to ask a Mod to allow me to start a GB in the GB-section?
As I said before, I dont want to cause any irritation...
And that is why I won't do it if there is anybody to veto this.
Of course no-one HAS to take part in the GB, but anyway...

And now I'll take my girlfriend out, so don't expect me back before midnight (german time). :-)
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Old 30th August 2011, 03:54 PM   #14
timpert is offline timpert  Netherlands
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Hi,

The 7812CTG is the ROHS compliant part, the 7812CT is not. Perhaps the "G" stands for "Green"? Anyway, functionally they are completely the same, and chances are that you'll get the CTG anyway. The ROHS part can still be soldered with leaded solder, so no problem here.

Look at this:

diyAudio - Announcements in Forum : Group Buys

It looks like you can just go ahead.

Have a good night out!
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Old 30th August 2011, 06:45 PM   #15
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Quote:
Originally Posted by timpert View Post
The battery clips used on the PCB (the Eagle 12BC210 and 12BC220) look a lot like the Keystone 530 and 540, which can be obtained from RS components.
This thread is a great idea. Thanks for starting it and everyone trying to help out. I'm just one guy so it's great to have some help answering questions, solving parts problems, etc.

The Keystone 530 and 540 are close but not quite the same footprint. It might be possible to adapt them but it would be better to include the Eagle parts in a group buy. The other option is to just use wire leaded 9 volt "snaps" (there's a part number in the BOM), trim the leads short, and secure the batteries with double-sided foam tape, etc. (which is a good idea even with the Eagle terminals).

The volume control is currently a big problem and I'm revising the PCB to work with several additional options including a Bourns pot stocked by Farnell
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Old 30th August 2011, 07:02 PM   #16
timpert is offline timpert  Netherlands
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I found the difference between the clips as well, right after posting. I should have looked better before flapping my mouth. Currently, Joneker is offering to organize a GB for the EU, and this thread seems to be the place to review any changes in the BOM and compatible part substitutes. The more people review the suggestions here, the better the list becomes. So thanks for looking!

it seems like a good idea to hold off ordering parts and to wait for the "design freeze" before finalizing the EU BOM.
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Old 30th August 2011, 07:08 PM   #17
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I've revised the board (not published yet) to also use 15 mm shaft length pots. See this post:

diyAudio O2 Headphone Post 261
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Old 30th August 2011, 07:11 PM   #18
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This thread is a great idea. I'd participate.
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Old 30th August 2011, 07:43 PM   #19
slatedk is offline slatedk  Denmark
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I am game for a GB - Postal prices are to scary for comfort here
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Old 30th August 2011, 09:06 PM   #20
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I would also be interested in EU GB. Even better, if there will also be seperate GB for chassis for those that designer's originally had in mind.
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