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Old 6th February 2012, 01:29 AM   #1921
a.wayne is offline a.wayne  United States
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A star distribution point for the outputs with decoupling caps ...?

@Tom:

Thanks for the Xtra links .......
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Old 6th February 2012, 01:30 AM   #1922
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Do you mean 3 rails like here?

Click the image to open in full size.
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Old 6th February 2012, 01:46 AM   #1923
gootee is offline gootee  United States
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Quote:
Originally Posted by tvrgeek View Post
Is there an easy way to save a thread, like the one Tom suggests?
I think he is suggesting basically a star for power distro, not just ground. Not uncommon in instrumentation and in high speed digital. I remember the power planes being carved up in multi-layer boards.
Save a thread? Like using Favorites/Bookmark in your browser? Or you could go post there and then you can use Quick Links --> Subscribed Threads.

You "could" think of it like "star grounding but also for the power rail", because we are wanting to not let the currents mix, so that there isn't mutual inductance and the total inductance will then reduce fully by paralleling (as does the total ESR of the caps and the interconnects). But it's really just paralleling of everything, so that the total impedance is reduced, like when resistors are paralleled.

We could add even more parallel paths to reduce the impedance even more.

We could parallel just conductors, with no caps involved, just to take the place of a single conductor, just in order to reduce the total parasitic inductance and resistance.

ACTUALLY, if we used n conductors, each 1/n times the size of the original conductor that they are replacing, then the inductance of each smaller conductor would be lower than that of the larger original (correct?), and the inductance-lowering effect would be even greater than I showed. But I guess the resistance of each of the smaller conductors would be greater than that of the original, so that part would be worse than I thought, in that case.

Cheers,

Tom

Last edited by gootee; 6th February 2012 at 01:55 AM.
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Old 6th February 2012, 01:49 AM   #1924
gootee is offline gootee  United States
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Originally Posted by Wavebourn View Post
Do you mean 3 rails like here?

Click the image to open in full size.
It depends how you have them connected. But that looks like a SERIOUS bank of capacitors!
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Old 6th February 2012, 01:54 AM   #1925
benb is offline benb  United States
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Quote:
Originally Posted by gootee View Post
Save a thread? Like using Favorites/Bookmark in your browser? Or you could go post there and then you can use Quick Links --> Subscribed Threads.
You can also go to a thread - under the "Tread Tools" thing there's a "Subscribe to thread" option that you can use without posting to the thread.

You can also use "Save as..." in your browser to save the current webpage to your own computer for reading offlone, but the current webpage for a long thread only contains some of the posts. I've got this thing set to display 50 posts per page. And before you ask it's at UserCP->Edit Options->Thread Display options. You're welcome.
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Old 6th February 2012, 01:56 AM   #1926
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Quote:
Originally Posted by gootee View Post
It depends how you have them connected. But that looks like a SERIOUS bank of capacitors!
Yes, it was my experiment with ultimate class A amp. 3 rails because I used augmented source followers.
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Old 6th February 2012, 01:57 AM   #1927
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Old 6th February 2012, 02:17 AM   #1928
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by Wavebourn View Post
Do you mean 3 rails like here?

Click the image to open in full size.

What's dat Siberian microwave ................
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Old 6th February 2012, 02:35 AM   #1929
gootee is offline gootee  United States
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Quote:
Originally Posted by Wavebourn View Post
Yes, it was my experiment with ultimate class A amp. 3 rails because I used augmented source followers.
I am still ignorant of many or probably most things audio, except for some of what I have just happened to attempt to delve into, over the last three or four years. Source follower implies FET buffers? JFETS, maybe? I can't even quite remember exactly how a source follower circuit is configured (Yes, that's embarrassing.). So what does the "augmented" part mean? And why three rails?

Anyway, how well did it work?
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Old 6th February 2012, 03:07 AM   #1930
gootee is offline gootee  United States
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Originally Posted by a.wayne View Post
Tom,

I'm not follow you here , 3 caps 3 rails ? Is there a diagram to view or could you offer a little more details for dummies err , like myself and tvr ...
At the link below, in post # 341, is a pretty-good summary of the "problem statement" for what I have been wanting to be able to do, with all of the jazz that I have been blathering-on about:

paralleling film caps with electrolytic caps
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