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Y.A.F5Tv3.B.T. Yet another F5Tv3 Build Thread
Y.A.F5Tv3.B.T. Yet another F5Tv3 Build Thread
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Old 1st December 2017, 07:44 PM   #91
gionag is offline gionag  Italy
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Join Date: Jun 2007
Quote:
Originally Posted by 2 picoDumbs View Post
Just for clarification.
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Old 1st December 2017, 09:14 PM   #92
gionag is offline gionag  Italy
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Join Date: Jun 2007
Nailed it !
was the Ultrafast diode bridge made with MUR3020...
with plain old GBPC style diode bridge... both of the transformers stopped... (for the moment) any humming...

i guess... in the end... Simple is better
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Old 3rd December 2017, 10:38 AM   #93
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
is there any chance you had the discrete rectifier diodes wired incorrectly?

If they were wired correctly, then the only explanation I can think of is that the larger loop areas of the discrete compared to the integrated bridge would increase interference.
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Old 3rd December 2017, 11:12 AM   #94
gionag is offline gionag  Italy
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Join Date: Jun 2007
Quote:
Originally Posted by AndrewT View Post
is there any chance you had the discrete rectifier diodes wired incorrectly?

If they were wired correctly, then the only explanation I can think of is that the larger loop areas of the discrete compared to the integrated bridge would increase interference.
... I think was a false alarm, i was pretty sure i've solved the winding uhum for good, but yesterday night, when i have fired up again the test bench, the transformer came back in all its humming glory.

So... i think the rect bridge was not the issue.

I will bring the transformers to the factory again and I will ask to re-wind the primary with a 20% more of the nominal flux. I think is a saturation issue.

Attached the bridge i have designed for the discrete mur3020.

C1,2,4 and R1 are not populated
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