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There has been interest in this topic recently, see http://www.homemadetools.net/forum/v...versions-73864
The content of this current post is contained in a PDF located at VFD stuff
Here are some pix as a trailer.
Attachment 30355 Attachment 30356 click image for full size
Attachment 30357 Attachment 30358
Attachment 30359
-Good grief, Tony!
A diy-ed 3P yoke LC filter! Excellent approach.
Nice, straight-forward write-up very much appreciated at this receiving end!
Did you mention the cap values - I was a bit eager in reading it...
Is the transformer whine from inter-layer movement in the core laminations?
You could perhaps dunk the whole shebang in varnish?
Keep up the good work, and I'll be somewhat more patient in the future!
Tip: For designing filters, there's a bunch of RF designs that could be applicable even at these freqs:
Search "Butterworth LC filter design" or peek at this random find:
https://rf-tools.com/lc-filter/
ATB
Johan
You need to read a bit slower to get your answer.Quote:
Originally Posted by DIYSwede
I did dunk the core in varnish and that had no noticeable effect so it is probably mostly magnetostriction and there is not a lot that I can do about that. It really is not a problem, once it was mounted in a box on the wall I could not hear it.Quote:
Originally Posted by DIYSwede
