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Old 10th June 2005, 06:23 AM   #1
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Default Cmoy Pcb Layout

Hello everyone I am after everyone's opinion of this cmoy layout that I redone it is the layout from guzzler over at

http://www4.head-fi.com/forums/showt...6&page=1&pp=20

I will attach the pcb file and an image if anyone can give comments of if I have made any mistakes before I go ahead and make it I will be greatly appreciated
Thanks
AB

Link for pic
http://people.aapt.net.au/grannygroover/Cmoy%20V2.jpg
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File Type: zip cmoy v2.zip (14.3 KB, 717 views)
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Old 10th June 2005, 06:42 AM   #2
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why don't people bypass the ps caps on these things? If it were me, I'd add a couple of film caps to do that.
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Old 10th June 2005, 09:50 AM   #3
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I've often wondered the same thing. I usually resort to soldering my own bypasses on to the pins if needed and running cable back to a ground point.

At least on that board, the caps are close enough to the opamp that you could probably just solder some small film or ceramics to the bottom of the electrolytics.
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Old 10th June 2005, 02:07 PM   #4
cyteen is offline cyteen  England
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The cmoy layout seems to be looked down on on this forum because of the lack of bypassing on the opamp.

The prefered layout seems to be dual supplies where the positive and negative rails can be bypassed to ground using 22-100uF electrolytic capacitors. These can be bypassed with 100nF multilayer ceramic.

In addition a 100-300nF cap directly from V+ to V- pins of the op-amp with ceramic or polyester is often suggested.

Another complaint of the cmoy is the low voltage usually supplied, most opamps prefer around 15v-18v

It would be nice to see a reference layout of a head amp that was generally approved by this forum to match the suggested schematics as I for one often have problems visualizing a layout from a schematic. Also many people new to electronics start from a head amp so it might be good educationally.
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Old 10th June 2005, 02:25 PM   #5
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I added 100nF to the rails on my SMD CMOY
Pic
Pic2
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Old 10th June 2005, 07:00 PM   #6
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I don't look down on the Cmoy. It was the first DIY amp I built quite a few years ago. But, after learning more and more, it seems silly not to have a small set of bypasses for higher-speed opamps.

Tobias -- that is one small cmoy! Very cool.. Though I would say skip the SMD electrolytics and go with through holes for better parts selection.
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Old 10th June 2005, 08:39 PM   #7
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Thanks everyone for the response looks like I have a few alterations up my sleve to do
Regards
AC
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Old 11th June 2005, 12:30 AM   #8
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motherone, yea i know but that board was just to fill out the prototype board from olimex (100x160mm) so it was just for fun.
http://www.ettnet.se/~tobias/diy/panelized_low.jpg
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Old 11th June 2005, 09:30 PM   #9
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Hello all
I redone the pcb last night and refering to the rail caps you will see where I added the 0.1 caps I think this is what your refering to please let my know what you think of the layout what needs changin or just leave it as is also I have not labled it on the board layout but just below the op amp there is 3 pads there where the TLE2426 rail splitter goes also is this realy required??.
Thanks all
AB

Link to pic http://people.aapt.net.au/grannygroover/Cmoy%20V3.jpg
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Old 12th June 2005, 12:12 PM   #10
guzzler is offline guzzler  Scotland
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Just a quick note from me... My design does have decoupling in the form of 0805 capacitors underneath the board

g
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