wim said:
perhaps the page was down?
i ordered straight from peter as i have consolidated orders(to save on shipping)and want to know the exact shipping amount.
you might want to mail him your order at peter@chipamp.com .
rgds
garbage
X.G. do You have maybe source files pcb for LM from this post
http://www.diyaudio.com/forums/showthread.php?postid=384230#post384230
?
http://www.diyaudio.com/forums/showthread.php?postid=384230#post384230
?
wim said:
You can order your kit from Peter: http://audiosector.com/
Peter does the Canadian and international shipping.
This "ground plane researcher" will be performing his detailed, meticulous, theoretically complex, not to mention highly misunderstoodinvestigations underground for awhile so as not to bother the peace-loving surface folk
.
BTW I agree that Brian's 3875 layout is very cute(9/10 on the CF scale) and greatly appreciate that project.
Oh, BTW#2, Peter, you're pcb original standard looks to have approximately half the ground noise compared with Brian's, but only 1/10 CF.
-Robert
Please don't take my comments in a wrong way. I am also interested in improving performance and going for best layout.
But I'm also very practical man and it's my experience, that sometimes things which might not seem "proper" from technical perspective, work very well in reality.
Not that I think anything is not proper on my recent layout. I actually want to use the board for common capacitor's grounds connection and for reference for OG taken form the same plane.
It simplifies matters when implementing different PS structures and sometimes people run those amps from batteries. As I mentioned earlier, SG is only for reference and it leaves all connection choices to you. But you need this reference pad on the board.
The layout is more compact than National's board, so any ground loops and other possible disturbances are greatly reduced.
As you all see, Kusunoki also doesn't use additional bypass caps. I never found them useful and when trying to install them directly at the big caps, I didn't like the sound of high frequencies.
PS: CF factor is quite important
I have read this thread and the corresponding thread at the following link but cannot find any discussion regarding noise measurements after the boards were completed. Did anyone ever post a comparison of the Peter Daniel and RFScheer layout/routing approaches?
Since the threads are long some quick links with examples are as follows:
Follow-up group buy thread:
http://www.diyaudio.com/forums/grou...ed-lm4780-pc-boards-anyone-interested-21.html
Peter Daniel layout example
http://www.diyaudio.com/forums/atta...m4780-pc-boards-anyone-interested-4780amp.jpg
An alternative routing approach that keeps V+ and V- gnd near to each other.
http://www.diyaudio.com/forums/atta...95786-pcb-lm3886-lm3876-lm4880-india-4780.jpg
http://www.diyaudio.com/forums/atta...m3886-lm3876-lm4880-india-pic_08623_small.jpg
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