1R resistor - Page 2

Upupa Epops · 6th April 2006, 06:13 AM

And schematic ( for completeness... ).

poobah · 6th April 2006, 02:12 PM

Stephen,

I was thinking more in terms of Kurt Vonnegut's usage of the asterisk... think it was in "Breakfast of Champions".

*

AndrewT · 6th April 2006, 02:33 PM

Hi Upupa,
re posts 9 & 10: are the upper & lower star grounds connected by the bolt (set screw) through the rectifier sink?

That is probably the most (18) I have seen, ever!

AndrewT · 6th April 2006, 02:38 PM

Hi Upuppa,
is the 134/634 buffer based on the Jung topology?
Which chip is SMD?

Upupa Epops · 6th April 2006, 04:22 PM

Hi Andrew, " main point " of grounding is below rectifier, both sides connected together... And WJ : yes, 634 have " diamond " topology. PCB is universal, for soic and dil opamps...

dfdye · 6th April 2006, 11:03 PM

Dumb question, but why not use a ground plane instead of a star ground?

poobah · 6th April 2006, 11:24 PM

dfdye,

I use grounds planes all the time and then star them together at single point. Ground planes are not always good things. They can be handy shields, and they can control impedance for high speed stuff, but they can also be awesome couplers (un-wanted) as well.

So in the spirit of jneutronesque analosity, they should be applied thoughtfully... ground is a myth.

pinkmouse · 6th April 2006, 11:27 PM

Personally, I like separate ground tracks to a star, then flood everything else with the ground plane. I'm sure there may well be reasons why you shouldn't do it that way, but it's always worked for me.

poobah · 6th April 2006, 11:38 PM

That's an EXCELLENT way of doing it pinkmouse...

Flooding your boards with copper helps to keep them from warping in wave or reflow operations too. It's going to be worse with this new RoHS ****!

pinkmouse · 6th April 2006, 11:43 PM

Pavel taught me to do something right then! Now we just have to work on the rest...

6th April 2006, 02:33 PM	#13
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Upupa, re posts 9 & 10: are the upper & lower star grounds connected by the bolt (set screw) through the rectifier sink? That is probably the most (18) I have seen, ever! __________________ regards Andrew T.

6th April 2006, 02:38 PM	#14
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Upuppa, is the 134/634 buffer based on the Jung topology? Which chip is SMD? __________________ regards Andrew T.

6th April 2006, 11:27 PM	#18
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Personally, I like separate ground tracks to a star, then flood everything else with the ground plane. I'm sure there may well be reasons why you shouldn't do it that way, but it's always worked for me. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

6th April 2006, 11:43 PM	#20
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Pavel taught me to do something right then! Now we just have to work on the rest... __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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6th April 2006, 02:12 PM	#12
poobah diyAudio Member Join Date: Nov 2005	Stephen, I was thinking more in terms of Kurt Vonnegut's usage of the asterisk... think it was in "Breakfast of Champions". *

6th April 2006, 04:22 PM	#15
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Hi Andrew, " main point " of grounding is below rectifier, both sides connected together... And WJ : yes, 634 have " diamond " topology. PCB is universal, for soic and dil opamps...

6th April 2006, 11:03 PM	#16
dfdye diyAudio Member Join Date: Dec 2005 Location: USA	Dumb question, but why not use a ground plane instead of a star ground?

6th April 2006, 11:24 PM	#17
poobah diyAudio Member Join Date: Nov 2005	dfdye, I use grounds planes all the time and then star them together at single point. Ground planes are not always good things. They can be handy shields, and they can control impedance for high speed stuff, but they can also be awesome couplers (un-wanted) as well. So in the spirit of jneutronesque analosity, they should be applied thoughtfully... ground is a myth.

6th April 2006, 11:38 PM	#19
poobah diyAudio Member Join Date: Nov 2005	That's an EXCELLENT way of doing it pinkmouse... Flooding your boards with copper helps to keep them from warping in wave or reflow operations too. It's going to be worse with this new RoHS ****!

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