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Old 11th March 2013, 02:22 AM   #271
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Join Date: Jun 2005
Location: Fort Worth, Texas
Originally Posted by alexberg View Post
Shield has nothing to do with the "leakage" inductance which is due to coupling between the windings. Shield are to reduce stray (electro)magnetic field emanated by inductor/x_former/etc.
A shields affect on leakage inductance would be indirect.
Its presence does not directly affect leakage inductance but it may affect the distance between the primary and secondary which will change the leakage inductance.
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Old 11th April 2013, 07:33 AM   #272
Legis is offline Legis  Finland
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Originally Posted by Legis View Post
The transformers' specifications that I ordered:

- Core's area ~11,5cm2, core material grain oriented silicon steel, Bmin = 1.7T
- 2 x 30 turn bifilar wound primaries (2,0mm2 wire)
- 2 x 120 turn bifilar wound secondaries (0,44mm2 wire)
- Primay is wound close to the core, secondary on top.
- Electromagnetic shield on the outer rim
I finally received the 1:8 step-up transformers. Primary leakage inductance (primaries in parallel, secondaries shorted) appears to be ~1-1.2H @ 650khz and the secondary parasitic winding capacitance 570pF (secondaries in series) @ 550kHz. (I cannot change the measurement frequecies.) After I have build the interface boxes I will do some measurements w/wo the trafo's in the signal path. For me it's very intersting to see and hear how the step-up trafo changes the sound and measurements of a dynamic driver, haven't tried this before.
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