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Old 10th February 2019, 03:23 PM   #941
shaan is offline shaan  India
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Hi Thimios.

I think it will run fine with those transistors and 47pF.
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Old 10th February 2019, 05:24 PM   #942
thimios is offline thimios  Greece
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Quote:
Originally Posted by shaan View Post
Hi Thimios.

I think it will run fine with those transistors and 47pF.
Too late shaan, no, they are unstable using ksa1381ksc3503.
I have a donation, part of it's is a set of faulty Peeceebee v4 boards.
In my attempt to repair those i had used ksa, ksc.
They oscillate badly.
8v on 47R vas load resistor.
Then i swap the ksa, ksc with bd139 140 and everything is fine.
I have some photos from the setup process but i don't know where i must post.
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Old 10th February 2019, 06:06 PM   #943
shaan is offline shaan  India
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Sorry to be late.

Does increasing 47pF to 56/68pF help?
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Old 10th February 2019, 06:42 PM   #944
thimios is offline thimios  Greece
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Quote:
Originally Posted by shaan View Post
Sorry to be late.

Does increasing 47pF to 56/68pF help?
I don't know.
My first effort is to repair those faulty boards.
Now i think that they are in good condition. Everything looks good.
Next step will be the modified compensation.
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Old 11th February 2019, 08:36 AM   #945
thimios is offline thimios  Greece
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The test setup.
Vas current, mosfet bias, offset voltage measured all together.
Two regulated power supplies used for +/- supply.
Attached Images
File Type: jpg IMG_20190210_172259.jpg (780.5 KB, 75 views)
File Type: jpg IMG_20190210_173301.jpg (433.7 KB, 77 views)
File Type: jpg IMG_20190210_185651.jpg (837.5 KB, 71 views)
File Type: jpg IMG_20190210_193532.jpg (432.3 KB, 70 views)

Last edited by thimios; 11th February 2019 at 08:53 AM.
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Old 11th February 2019, 07:16 PM   #946
thimios is offline thimios  Greece
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These two boards are a part of a Big very Big donation.
Thanks Man!!!
The member who donated,gave those as faulty.
During repair i didn't seen any wrong placed part,not something like short circuit not dry soldering.All looks good,very good job.
I believe that he failed during setup procedure.
I will post, as built shematic and measurements soon.
I will try to post the trimmer setup procedure with pictures to help others not fail again.
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