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Chip Amps Amplifiers based on integrated circuits

1R resistor
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Old 6th April 2006, 06:13 AM   #11
Upupa Epops is offline Upupa Epops  Czech Republic
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And schematic ( for completeness... ).
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Old 6th April 2006, 02:12 PM   #12
poobah is offline poobah  United States
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Stephen,

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

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Old 6th April 2006, 02:33 PM   #13
AndrewT is offline AndrewT  Scotland
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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!
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Old 6th April 2006, 02:38 PM   #14
AndrewT is offline AndrewT  Scotland
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Hi Upuppa,
is the 134/634 buffer based on the Jung topology?
Which chip is SMD?
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Old 6th April 2006, 04:22 PM   #15
Upupa Epops is offline Upupa Epops  Czech Republic
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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...
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Old 6th April 2006, 11:03 PM   #16
dfdye is offline dfdye  United States
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Dumb question, but why not use a ground plane instead of a star ground?
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Old 6th April 2006, 11:24 PM   #17
poobah is offline poobah  United States
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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.



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Old 6th April 2006, 11:27 PM   #18
pinkmouse is offline pinkmouse  Europe
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1R resistor
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.
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Old 6th April 2006, 11:38 PM   #19
poobah is offline poobah  United States
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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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Old 6th April 2006, 11:43 PM   #20
pinkmouse is offline pinkmouse  Europe
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Pavel taught me to do something right then! Now we just have to work on the rest...
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