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| Self Capacitance of toroidal coil? - RF Cafe Forums | ||||||
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Below are all of the forum threads, including all the responses to the original posts. oz7acs Post subject: Self Capacitance of toroidal coil? Posted: Thu Jul 26, 2007 10:16 am Lieutenant Joined: Thu Jul 26, 2007 9:25 am Posts: 4 Location: Roskilde, Denmark Hi againm 1) Does anyone know how to model the self capacitance between windings of a toroidal coil wounded on a nonmagnetic ring? or a ferrite ring? Let's say that we have 40 turns, outer core diameter is 35mm and the relative permittivity of the ferrite is about 15. I am interested in a simple model of the self capacitance as a limiting factor of the actual measured inductance at a frequency well below the upper limit due to the unwanted LC-effect. 2) Will the self-cap in air with close distance between turns (<1mm) or the self-cap across the core with larger distance (>6mm) be the most contributing cap? 3) How will self-cap change if the coil is wounded in 2 layers as opposed to one layer? 4) What about stray capacitance at low frequencies: f<10MHz? or f<1MHz? Will it matter? _________________ Best regards and Vy 73 de OZ7ACS aka JPH Posted 11/12/2012 | ||||||
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