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Help building a cmoy amp - cmoy vs. cmoybb?

post #1 of 49
2/23/10 at 1:37am
Thread Starter 
After doing some reading on amps, I decided before I drop a few hundred on a nice amp that I would start with a cmoy just to get an understanding on how (or if) it would be worthwhile.

I searched the forums and on ebay but after doing some reading I figured instead of buying one I'd try to build one myself. But I did have a few questions and was hoping to get some help (I tried searching the forums, I apologize if these are answered someplace else already)

I found this blog entry with a tutorial and parts list for the amp. Are these parts outdated? From what I understand some parts have been upgraded.

Are kits with all the parts online worth doing or better to pick up the parts yourself from radio shack or mouser?

I would rather buy from a head-fi user if I straight out bought one, but the idea of building one sounds like fun.

Thanks in advance for any help.
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post #2 of 49
2/23/10 at 1:58am
Tangent's site is the best for building the cmoy, you wont go wrong if you follow the instructions to the letter, that ebay amp is IMO rubbish

Good luck with the amp

cheers
FRED
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post #3 of 49
2/23/10 at 2:00am
Thread Starter 
Thank you for the reply It helps to have pictures
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post #4 of 49
2/23/10 at 11:23pm
Thread Starter 
Are there different parts for the BB cmoy?

I haven't added all the prices up for the parts yet, but are they about on par with what a kit online would be?
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post #5 of 49
2/26/10 at 12:57am
Thread Starter 
After doing some reading on the cmoybb's I'm thinking about going that route instead.

I'm rocking a pair of ATH-ES7's and I've read that the bb edition pushes them better than the standard cmoy.

Is there a huge difference or is it negligible?
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post #6 of 49
2/26/10 at 2:59am
i've read it through + look at it.
I believe that CmoyBB has more power to drive, giving it more headroom.

And I believe if you use a better opamp, it'll compliment nicely with the extra juice.
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post #7 of 49
2/26/10 at 4:12am
I use a BB with my ES7's. I can't compare it to a "regular" cMoy as I don't have one but it certainly does sound good for what it is.
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post #8 of 49
2/26/10 at 7:51pm
Hi Guys,
I need some help whit a CMoy so I decided to write here and not open another Thread.
I finished assambling it and I have clear stereo sound but just at a low level. When I increase the level the distorsion level its very high!! its peaks continuosly.
I've took out the poti but whit no luck also the swicher and the R5 and olso no luck
Any one have any idea?
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post #9 of 49
2/26/10 at 10:07pm
measure your virtual ground split, it could be out
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post #10 of 49
2/26/10 at 10:32pm
Thread Starter 
Order all my parts for the cmoyBB, couldn't find two part from Mouser or Digikey
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post #11 of 49
2/26/10 at 10:42pm
do you want us to guess
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post #12 of 49
2/26/10 at 10:48pm
Thread Starter 
Sorry, forgot to add detail, was doing some searching. I'm missing the

Alps RK0971221Z05 10k Volume Potentiometer

Texas Instruments TLE2426CLP

I've done some searching but haven't had luck, most of the online stores I've found have a $50 minimum per order and these will be something like $5 without shipping.

Anyone know where I might be able to order them?

Any help would be greatly appreciated
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post #13 of 49
2/26/10 at 11:02pm
Tangent's shop I think he sells them
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post #14 of 49
2/26/10 at 11:34pm
Lasraik,

The mouser part number for the potentiometer is: 688-RK0971221Z05 - for the TLE2426CP, the Mouser part number is 595-TLE2426CP

Both are in stock.

-Mike
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post #15 of 49
2/26/10 at 11:59pm
Not to derail your plan, but another option is the JDSlabs cmoy BB PCB. That was my first built. You'll probably learn more with tangent's way... but thought it was worth mentioning at least.
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