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Is this CMOY layout good?
Is this CMOY layout good?
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Old 7th January 2018, 08:42 PM   #1
nenad88 is offline nenad88
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Smile Is this CMOY layout good?

So i found this pcb of CMOY headamp and want to know is it any good. Does it have any flaws?

cMoy Headphone amplifier with standard enclosure from akafugu on Tindie

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Click the image to open in full size.

Thanks.
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Old 8th January 2018, 04:19 PM   #2
TypodCrow is offline TypodCrow
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I've only ever built one on a breadboard - but it looks right to me. Only thing you should wait for someone else to confirm is the resistor and capacitor values. I don't recall off the top of my head what they should be for which op amp chip.
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Old 27th January 2018, 04:01 AM   #3
Chunkers is offline Chunkers  United Kingdom
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Quote:
Originally Posted by nenad88 View Post
So i found this pcb of CMOY headamp and want to know is it any good. Does it have any flaws?

Thanks.
Hi nenad88,

Did you manage to get this ordered and delivered, I am also looking for a CMOY PCB - I have been building one on a prototype board and finding it annoying

The reason I am asking is the last comment is from 2016 and the link you showed suggests "out of stock"

Thanks

Chunks
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Old 29th January 2018, 05:41 PM   #4
nenad88 is offline nenad88
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Hi, my plan was to build them in china because design files are available on this link: GitHub - akafugu/cmoy: Eagle Design files for our cmoy headphone amplifier
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Old 30th January 2018, 06:45 AM   #5
Chunkers is offline Chunkers  United Kingdom
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OK thanks for your reply, I am looking for a decent PCB with through hole design suitable for a beginner and I thought this might work.

Now I ma looking at possibly getting a super CMOY board, only issue is that it has SM components, which I am not familiar / confident with

Chunks
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Old 30th January 2018, 05:20 PM   #6
schubert is offline schubert  United States
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Why build a cmoy when you can build an A-47?
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Old 3rd February 2018, 03:27 AM   #7
Chunkers is offline Chunkers  United Kingdom
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Originally Posted by schubert View Post
Why build a cmoy when you can build an A-47?
Whats an A-47?

C

EDIT : Sorry I found it - I'm gonna buy one for soldering practice!

KKmoon 47 Amp DIY NE5532 Hi-Fi Headphone Amplifier Kit with Transparent Housing DC9V-18V: Amazon.co.uk: DIY & Tools

Are there any upgrades I should consider / is there a better version?

Last edited by Chunkers; 3rd February 2018 at 03:36 AM. Reason: Answered my own question -duh!
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Old 3rd February 2018, 04:10 AM   #8
ammel68 is offline ammel68  United States
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Is this CMOY layout good?
Quote:
Originally Posted by Chunkers View Post
Whats an A-47?

EDIT : Sorry I found it - I'm gonna buy one for soldering practice!
That's exactly what I was wondering. What in the hell is a A-47?

After looking at it, it appears that "soldering practice" is all that worthless NE5532 kit is for...LOL.

Upon examining the board, I don't see any provisions for the four .1uF PS decoupling caps for the 5532s.
And that hideous volume pot is guaranteed to have horrible channel imbalance issues at lower levels.
Then again...this is a classic example of "you get what you pay for".
Thank god they don't ship this worthless kit to the good ole' U.S.A.

If you're into single op-amp designs, a OPA134 version of the CMOY would probably provide better SQ...if one exists.
There are several op-amp designs on this forum that will sound better than the CMOY or the infamous "A-47". Perhaps that is short for a AK-47 rifle?? Who knows.

Now...let's bust out the moonshine and soldering iron and practice on a good ole' A-47 from Amazon.
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Old 3rd February 2018, 09:28 PM   #9
schubert is offline schubert  United States
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Apheared A-47 - sort of a hopped-up cmoy with two op-amps per channel. Sounds really nice. Instructions here
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