Re: mounting a pot core

From	Bill Sloman <bill.sloman@ieee.org>
Newsgroups	sci.electronics.design
Subject	Re: mounting a pot core
Date	2026-01-25 14:33 +1100
Organization	A noiseless patient Spider
Message-ID	<10l42tf$1bchc$1@dont-email.me> (permalink)
References	(6 earlier) <dvr4nkp5psqcnnob5k48n9rfs6t0h69ahj@4ax.com> <10kuvci$3jqga$3@dont-email.me> <lh07nk10fi6ud49hc93jvrcpgptle21djk@4ax.com> <10l0731$1jnc$1@dont-email.me> <1rpgfx1.183lmxb18zpaqmN%liz@poppyrecords.invalid.invalid>

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On 25/01/2026 6:25 am, Liz Tuddenham wrote:
> Bill Sloman <bill.sloman@ieee.org> wrote:
> 
>> On 24/01/2026 1:19 am, john larkin wrote:
>>> On Fri, 23 Jan 2026 16:01:58 +1100, Bill Sloman <bill.sloman@ieee.org>
>>> wrote:
>>>
>>>> On 23/01/2026 5:57 am, john larkin wrote:
>>>>> On Thu, 22 Jan 2026 10:58:01 -0500, legg <legg@nospam.magma.ca> wrote:
>>>>>
>>>>>> On Wed, 21 Jan 2026 16:34:34 -0800, john larkin <jl@glen--canyon.com>
>>>>>> wrote:
>>>>>>
>>>>>> <snip>
>>>>>>> We plan to buy a length of micro-coax with an SMB connector on each
>>>>>>> end. We'll wind that on the bobbin and plug it into pcb SMB
>>>>>>> connectors.
>>>>>>>
>>>>>>> Like this, but higher voltage.
>>>>>>>
>>>>>>>
>>>>>>> https://www.dropbox.com/scl/fi/9hbvwwo2bmx4z33w9uetv/TX_1.jpg?rlkey=4
>>>>>>> j8llr8z6z360ec5b8adx53gz&raw=1
>>>>>>>
>>>>>>> Those tiny H.FL connectors can't take much voltage.
>>>>>>>
>>>>>>
>>>>>> Mount the transformer on the box wallwith on a layer of vibration
>>>>>> absorber.
>>>>>>
>>>>>> Connect your flying leads as required.
>>>>>>
>>>>>> Energy storage ~ minimum xsectional area - not mass. . . .
>>>>>> so align your slots.
>>>>>>
>>>>>> RL
>>>>>
>>>>> We like to put parts on PC boards. But why vibration isolation?
>>>>>
>>>>> We will use a bigger pot core on the new product. I measured a 2%
>>>>> change in inductance as the core halves were rotated, so slot
>>>>> alignment is no big deal.
>>>>
>>>> It doesn't degrade the performance much, but it is very visible evidence
>>>> that you and your production staff don't know enough about what you are
>>>> doing.
>>>
>>> Don't be a jerk. We sell lots of the digital delay generator with the
>>> optional high-voltage outputs. It works great.
>>
>> Customers don't tend to open them up and look at the construction.
>>
>>> What are you designing lately?
>>
>> Nothing much.
>>
>>>> Performance is what really matters, but getting stuff to look right is
>>>> also important.
>>>
>>> Nobody has complained about the cosmetics of the pot core gap
>>> alignment so far. We test every unit so the random alignment must not
>>> matter.
>>
>> It's not just the cosmetics. The random alignment doesn't matter much,
>> but it does make a difference, and you should have got it right.
> 
> It depends on which way is 'right'.  If the bobbin is in two sections
> and has two separate windings which must be kept apart, staggering the
> 'windows' will ensure that the leads from the two windings are brought
> out in different places and they cannot stray anywhere near each other.

That's the sort of scheme you get with people who don't know what they 
are doing.

If you don't want two pairs of leads to interact, twist each pair of 
leads and take them out through different slots.

Twisting each pair of leads separately is a much more potent protection 
against interaction than just keeping them physically separate.

-- 
Bill Sloman, Sydney

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Thread

mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-21 08:45 -0800
  Re: mounting a pot core Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2026-01-21 12:28 -0500
  Re: mounting a pot core Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2026-01-21 12:28 -0500
    Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-21 10:11 -0800
  Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-22 04:49 +1100
    Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-21 10:18 -0800
      Re: mounting a pot core Jeroen Belleman <jeroen@nospam.please> - 2026-01-21 23:47 +0100
        Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-21 16:34 -0800
          Re: mounting a pot core Joe Gwinn <joegwinn@comcast.net> - 2026-01-21 19:48 -0500
            Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-21 17:06 -0800
            Re: mounting a pot core Jeroen Belleman <jeroen@nospam.please> - 2026-01-22 13:17 +0100
              Re: mounting a pot core Joe Gwinn <joegwinn@comcast.net> - 2026-01-22 12:47 -0500
                Re: mounting a pot core Joe Gwinn <joegwinn@comcast.net> - 2026-01-22 15:49 -0500
                Re: mounting a pot core Jeroen Belleman <jeroen@nospam.please> - 2026-01-22 23:49 +0100
          Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-22 17:57 +1100
            Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-22 08:31 -0800
              Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-23 15:57 +1100
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-23 06:24 -0800
                Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-24 03:35 +1100
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-23 08:40 -0800
                Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-24 17:01 +1100
          Re: mounting a pot core Jeroen Belleman <jeroen@nospam.please> - 2026-01-22 12:59 +0100
          Re: mounting a pot core legg <legg@nospam.magma.ca> - 2026-01-22 10:58 -0500
            Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-22 10:57 -0800
              Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-23 16:01 +1100
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-23 06:19 -0800
                Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-24 03:19 +1100
                Re: mounting a pot core liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-01-24 19:25 +0000
                Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-25 14:33 +1100
                Re: mounting a pot core liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-01-25 11:07 +0000
                Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-26 02:46 +1100
                Re: mounting a pot core legg <legg@nospam.magma.ca> - 2026-01-25 08:51 -0500
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-25 08:08 -0800
                Re: mounting a pot core legg <legg@nospam.magma.ca> - 2026-01-25 22:44 -0500
                Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-26 17:56 +1100
                Re: mounting a pot core legg <legg@nospam.magma.ca> - 2026-01-26 10:50 -0500
                Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-27 03:23 +1100
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-26 08:51 -0800
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-26 07:53 -0800
                Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-27 03:36 +1100
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-26 08:48 -0800
                Re: mounting a pot core Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2026-01-26 13:12 -0500
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-26 10:58 -0800
                Re: mounting a pot core Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2026-01-26 20:36 +0000
                Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-27 14:30 +1100
      Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-22 17:51 +1100
        Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-22 11:09 -0800
          Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-23 16:16 +1100
            Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-23 06:13 -0800
              Re: mounting a pot core Jeroen Belleman <jeroen@nospam.please> - 2026-01-23 16:07 +0100
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-23 08:22 -0800
                Re: mounting a pot core Jeroen Belleman <jeroen@nospam.please> - 2026-01-24 12:17 +0100
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-24 07:54 -0800
                Re: mounting a pot core Jeroen Belleman <jeroen@nospam.please> - 2026-01-25 13:04 +0100
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-25 07:33 -0800
                Re: mounting a pot core Jeroen Belleman <jeroen@nospam.please> - 2026-01-25 17:32 +0100
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-25 11:12 -0800
                Re: mounting a pot core JM <sunaecoNoChoppedPork@gmail.com> - 2026-01-25 19:44 +0000
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-25 13:07 -0800
                Re: mounting a pot core JM <sunaecoNoChoppedPork@gmail.com> - 2026-01-25 22:40 +0000
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-25 17:29 -0800
                Re: mounting a pot core JM <sunaecoNoChoppedPork@gmail.com> - 2026-01-25 19:40 +0000
              Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-24 03:39 +1100
                Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-23 10:09 -0800
                Re: mounting a pot core Bill Sloman <bill.sloman@ieee.org> - 2026-01-24 16:49 +1100
  Re: mounting a pot core legg <legg@nospam.magma.ca> - 2026-01-22 10:46 -0500
    Re: mounting a pot core john larkin <jl@glen--canyon.com> - 2026-01-22 11:16 -0800

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