Hi!
How should be winded a good Phase splitting transformer?
1. Bifilar mode, but with a center tap? (Like e.g. EDCOR's XSM10K:10K) Some people says its works, but some says it is not good.
2. In a "classical" sectioning way, like e.g. 3 section of prim. and 2 section of sec.
Greets:
Tyimo
How should be winded a good Phase splitting transformer?
1. Bifilar mode, but with a center tap? (Like e.g. EDCOR's XSM10K:10K) Some people says its works, but some says it is not good.
2. In a "classical" sectioning way, like e.g. 3 section of prim. and 2 section of sec.
Greets:
Tyimo
In my experience you are right Tony. A while back I was thinking of winding some output transformers using the Pi winding technique. To prove the idea I wound a center tapped anode choke for the 7N7 drivers in my 807ish amp (5B-255M). I used a pretty small C core transformer that came from a current injection rig. The first wind was a dismal failure, I just used normal interleaving. The max frequency was poor due to interwinding capacitance. The second try was split bobbin in two halves also using normal interleaving, this was better but I wanted more. The last try used a bobbin split into six vertical sections, each section had five layers. This choke was nearly perfect and I was quite pleased with it. As a phase splitting tranny it also works very well. The only trouble was I didn't write anything down or take any photos during the wind up. Doh. So I only have one and the likelyhood of making another one the same is slim. I will have a rummage in the junk box and take a photo of it if anyone is interested. Another good thing about this winding method is that although it takes a bit of time to make the bobbin the sections are narrow and there is no need for neatly wound layers.
Cheers Matt.
Cheers Matt.
Hi Tony!
Connecting the primaries in series and the sec. in parallel?
Do you recommend the Pi - bifilar winding as a good counter to the capacity problems of the bifilar winding technique?
Greets:
Tyimo
How do you mean this bifilar winding with the Pi winding technique?several vertical sections with bifillar winding will even be better
Connecting the primaries in series and the sec. in parallel?
Do you recommend the Pi - bifilar winding as a good counter to the capacity problems of the bifilar winding technique?
Greets:
Tyimo
Hi Matt!
Greets:
Tyimo
Yes, I am interested!I will have a rummage in the junk box and take a photo of it if anyone is interested.
Greets:
Tyimo
Hi Tony!
How do you mean this bifilar winding with the Pi winding technique?
Connecting the primaries in series and the sec. in parallel?
Do you recommend the Pi - bifilar winding as a good counter to the capacity problems of the bifilar winding technique?
Greets:
Tyimo
two ways to do it, first is bifillar in 4 vertical or pi sections, second is 4vertical sections with primaries and secondaries in juxtaposition with each other....the first will be easier to do since you wind both primaries and secondaries at the same time...
quite right, but interstage trafs are not my strong...it is, but it's more fun to diy.....
Wouldn't mind learning though.
Is it possible to make top sounding trafos by ourselfs? or does it take many trial-error-trial-error-trial cycles?
why not? there are many info from Radiotron Designers' Handbooks, and the writings of Norman Crowhurst are available from the net....
Yes, there are many info's and excellent math on it, so I will need to study it all and the start testing my calculations.
A lot of hard work if the result is not brilliant...
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