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opamp for cmoy

post #1 of 11
4/25/10 at 9:21pm
Thread Starter 
I'm a noob at this and I'm building one. I was thinking the ad8397 or opa2228. I know I mighf need a soic to dip adapter. So how would those work in a cmoy? Would I have a hard time getting it stable or whatever? Oh and my headphones are shure 840s. Thanks
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post #2 of 11
4/26/10 at 2:50am
The ad8397 is a difficult opamp to tame. Requires a specially designed PCB. Want a ad8397? Make a Mini3. Want a cmoy? Start with a cmoybb PCB, pop in a OPA2132 or OPA2134 and take it from there.
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post #3 of 11
4/26/10 at 3:06am
If you want a layout for a AD8397 cmoy type I have one I made for my self and a friend, you're welcome to the layout and circuit, but the board you'll need to make yourself (I use toner transfer)
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post #4 of 11
4/26/10 at 3:10am
NJM4556A will put out 70ma, works at low voltages, and costs less than a dollar.
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post #5 of 11
4/26/10 at 6:14am
I like opa2227 and opa2107

2227 is more transparent and dynamic where else 2107 is a warmer mids centric but still have about 80% of the dynamic nature of 2227.

AD823a is very punchy and aggressive, if thats your thang.
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post #6 of 11
4/26/10 at 10:42am
Quote:
Originally Posted by joe_cool View Post
NJM4556A will put out 70ma, works at low voltages, and costs less than a dollar.
I second this

AD8620 is excellent too.
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post #7 of 11
4/29/10 at 6:40pm
Thread Starter 
Will the AD823a work in a regular designed cmoy?
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post #8 of 11
4/29/10 at 7:40pm
Yes, but it's not a great choice due to its low output current.

See my Notes on Audio Op-Amps
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post #9 of 11
5/1/10 at 11:53pm
Thread Starter 
Oh well how about the opa2227 then? Will that be good with the cmoy?
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post #10 of 11
5/2/10 at 6:09am
A OPA2227 will work fine. An assembled cmoybb from jdslabs.com comes with one pre-installed.
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post #11 of 11
5/6/10 at 4:11pm

computeruler,

 

opa2227 seems to be a standard opamp for a cmoy. For instance, those built by JDS Labs and biosciencegeek.

 

But have you had a look at:

 

http://www.head-fi.org/forum/thread/432749/the-opamp-thread

 

and

 

http://www.head-fi.org/forum/thread/243642/best-sounding-cheep-op-amp-for-cmoy-s-opa2227-opa2228-ad8066-other

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