From: jl@glen--canyon.com   
      
   On Thu, 6 Nov 2025 23:48:45 +0100, Jeroen Belleman   
    wrote:   
      
   >On 11/6/25 20:25, Christopher Howard wrote:   
   >> In an coil with inductance and a distributed capacitance — neglecting   
   >> resistance for the moment — do the inductance and distributed   
   >> capacitance map over to the inductance and capacitance in a parallel LC   
   >> circuit, or am I fundamentally misunderstanding something?   
   >>   
   >   
   >Yes indeed. There is a frequency where the impedance reaches   
   >a peak and then it drops. In fact, it may do that several   
   >times over.   
   >   
   >The first resonance frequency of many inductors is depressingly   
   >low.   
   >   
   >Jeroen Belleman   
      
   A real inductor is a nightmare. Especially a long solenoid. Every turn   
   inductively couples to every other turn with all possible coupling   
   coefficients. Distributed capacitances will be similarly complex.   
      
   And then there's the speed of light.   
      
   In a bit of googling (I do have a day job) I haven't seen a good sim   
   or measurement of a real inductor. Everybody keeps citing the simple   
   LC formula as if it's true.   
      
   We make some laser drivers that include a multi-section home-made bias   
   tee, trying to synthesize a super-wideband high current inductor. Yuk.   
      
      
   John Larkin   
   Highland Tech Glen Canyon Design Center   
   Lunatic Fringe Electronics   
      
   --- SoupGate-Win32 v1.05   
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