From: jl@glen--canyon.com   
      
   On Tue, 27 Jan 2026 03:36:36 +1100, Bill Sloman    
   wrote:   
      
   >On 27/01/2026 2:53 am, john larkin wrote:   
   >> On Sun, 25 Jan 2026 22:44:02 -0500, legg  wrote:   
   >>   
   >>> On Sun, 25 Jan 2026 08:08:48 -0800, john larkin    
   >>> wrote:   
   >>>   
   >>>> On Sun, 25 Jan 2026 08:51:24 -0500, legg  wrote:   
   >>>>   
   >>>>> On Sat, 24 Jan 2026 19:25:35 +0000, liz@poppyrecords.invalid.invalid   
   >>>>> (Liz Tuddenham) wrote:   
   >>>>>   
   >>>    
   >>>>> In applications where power levels are important, pot core orientation   
   >>>>> will affect 'N' in the flux density concentration, and produce early   
   >>>>> saturation at the location where minimum x-sectional area occurs.   
   >>>>>   
   >>>>> RL   
   >>>>   
   >>>> That should have a small effect on my pulser. Ill try it.   
   >>>>   
   >>>> I got a 2% change in inductance when I rotated the core halves.   
   >>>>   
   >>>>   
   >>>> John Larkin   
   >>>> Highland Tech Glen Canyon Design Center   
   >>>> Lunatic Fringe Electronics   
   >>>   
   >>> 2% FREE x-sectional area, and an indication that the previous   
   >>> misalignment doesn't dominate minimum value.   
   >>>   
   >>> Mind you, you can get a similar change just by forcing out   
   >>> the fluff and detritus present at the contacting surfaces.   
   >>> That might be what you're actually seeing, even if the core   
   >>> is gapped.   
   >>>   
   >>> In pot cores, minimum x-section usually occurs where the centre   
   >>> core meets the top and bottom plates. In parts shapes designed   
   >>> for power applications, this is usually corrected.   
   >>>   
   >>> This core rotation can be used as a tolerance trim, where   
   >>> needed, but anything like that before impregnation is probably   
   >>> just biting fart bubbles.   
   >>   
   >> Impregnation?   
   >   
   >Some people like to lock the windings and the leads in place with a   
   >heavy layer of encapsulant. This works better if you put the part to   
   >encapsulated under vacuum before you pour on the encapsulant.   
   >   
   >I've never seen it done, but I've heard about it. It's apparently very   
   >messy.   
      
   Wet stuff is messy, really nasty in production. In the case of a   
   txline transformer made with a few turns of coax, there's no reason to   
   pot it.   
      
   We just spin a few turns on a bobbin and clamp it into the pot core.   
   If it got sloppy, a tie-wrap would secure things.   
      
   Some people like the idea of potting things. Weird.   
      
      
   John Larkin   
   Highland Tech Glen Canyon Design Center   
   Lunatic Fringe Electronics   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)