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Old 10th December 2013, 03:17 PM   #11
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Quote:
Originally Posted by pooge View Post
So is +/-24v out of the question?
No the max per regulator is somewhere below 40V (depending on the opamp).
With a pos and a neg reg (there's one pos and one neg reg on one PCB) you can go up to +/-36~38V.

Jan
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Old 10th December 2013, 03:33 PM   #12
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ground is relative
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Old 10th December 2013, 03:36 PM   #13
AndrewT is offline AndrewT  Scotland
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Originally Posted by jan.didden View Post
I wouldn't expect that. BTW In my previous post I should have recommended to get either the B or the C version, not the A version of course.
Just checked, my own board has a B in both places.

Jan
The pdf sch shows A grade for one of the transistors.
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Old 10th December 2013, 04:55 PM   #14
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The pdf sch shows A grade for one of the transistors.
Correct. Please re-read post #3 & #5.

Jan
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Old 10th December 2013, 05:01 PM   #15
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ground is relative
Everything is relative, since 1916 or so

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Old 10th December 2013, 05:03 PM   #16
tinitus is offline tinitus  Europe
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it is confusing
please correct

do you mean ... if buying, get B or C if possible, but A would be ok too, in one side ?

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Originally Posted by jan.didden View Post
Correct. Please re-read post #3 & #5.

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Old 10th December 2013, 05:39 PM   #17
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it is confusing
please correct

do you mean ... if buying, get B or C if possible, but A would be ok too, in one side ?
A would be OK in either side. It's just what I had, the performance is only very weakly depending on that, it's not measurable.
But I will change the schematic and the BoM.

Edit: Done.

Jan
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Last edited by jan.didden; 10th December 2013 at 06:04 PM.
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Old 10th December 2013, 07:00 PM   #18
tinitus is offline tinitus  Europe
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very clear, thank you Jan
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Old 11th December 2013, 08:38 AM   #19
AndrewT is offline AndrewT  Scotland
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Originally Posted by jan.didden View Post
Correct. Please re-read post #3 & #5.

Jan
Jan,
the sch shows a grade A and yet in post5 you correct what you said in post3 where you said C is better than B, even though you had B fitted in both locations in your own build.

Why show A when you tell us that A is the least preferred of the three grades.

Either, the sch should not show any grade and builders will use what they can find, or the sch shows alternatives (i.e. grades A and B) without comment.
Or, the pdf explains that there is a preferred and that all grades are acceptable.

As is, the sch is confusing, because it appears one must be B grade and the other must be A grade.
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Old 11th December 2013, 10:00 AM   #20
pooge is offline pooge  United States
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Quote:
Originally Posted by jan.didden View Post
No the max per regulator is somewhere below 40V (depending on the opamp).
With a pos and a neg reg (there's one pos and one neg reg on one PCB) you can go up to +/-36~38V.

Jan
But in post #7 you said,

"The opamp is supplied from the output voltage so there's your limit as far as output voltage is concerned. I think max 44V (+/-22V) is the limit for available opamps, in that case you don't want to go higher than 40V or so."
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