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Measuring Leakage Inductance - voltech.com
https://www.voltech.com/support/technical-articles/measuring-leakage-inductance/#:~:text=Leakage%20inductance%20is%20an%20inductive%20component%20present%20in,imperfect%20magnetic%20linking%20of%20one%20winding%20to%20another.
Chapter 17 Winding Capacitance and Leakage Inductance
https://allanfaulds.weebly.com/uploads/2/1/2/7/21271896/transformer-and-inductor-design-handbook_chapter_17.pdf
The best way to minimize the leakage inductance, and to have a balanced dc resistance in a push-pull or center-tapped winding, is to wind bifilar. Bifilar windings will drastically reduce leakage inductance. This condition also exists on the secondary, when the secondary is a full-wave, center-tapped circuit. A bifilar
Rewinding Audio Coupling Transformers - WordPress.com
https://nzvrshome.files.wordpress.com/2018/10/rewinding-audio-coupling-transformers.pdf
leakage inductance and winding capaci- tance are to be kept at reasonable levels. As a general rule, the maximum step up ratio for acceptable audio quality was 5: 1, and for reasonable quality was lim- ited to a 3:1 turns ratio. The reality is that many audio trans- formers were not engineered, but made empirically and with economy a prime factor.
Designing transformer leakage inductance | diyAudio
https://www.diyaudio.com/community/threads/designing-transformer-leakage-inductance.71961/
For example: here is a LTSpice simulation with an 1:16 transformer with a leakage inductance of 500nH (and ~6uH magnetizing inductance, which would equal 3 primary turns on an ETD34, N87 ferrite), a 220nF capacitor and a 120 Ohm load on the transformer secondary. Switching frequency is 285kHz with 50% duty cycle.
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