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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Instead scopes
Date: Mon, 09 Sep 2024 14:27:38 -0700
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On Mon, 9 Sep 2024 19:51:52 +0100, piglet <erichpwagner@hotmail.com>
wrote:

>On 01/09/2024 3:09 pm, john larkin wrote:
>> On Sun, 1 Sep 2024 17:45:46 +1000, Bill Sloman <bill.sloman@ieee.org>
>> wrote:
>> 
>>> On 30/08/2024 2:21 am, Jan Panteltje wrote:
>>>> On a sunny day (Fri, 30 Aug 2024 00:43:39 +1000) it happened Bill Sloman
>>>> <bill.sloman@ieee.org> wrote in <vaq1f2$jdj$1@dont-email.me>:
>>>>
>>>>> It's lot easier and quicker to bread-board a circuit in LTSpice than it
>>>>> is to wire up a test circuit, but what that means is that you need to
>>>>> make fewer real circuits and they are a lot more likely to work when tested.
>>>>>
>>>>> That, on it's own, is enough to explain why labs look different today
>>>>> than they did in the dark ages.
>>>>
>>>> All it explains is boeings falling apart and astronuts ending up stuck at the ISS
>>>> and no moonlanding from the US, not even a probe.
>>>> Slimulations are _not_ realty and never will be.
>>>
>>> But they can capture useful parts of reality, if you know what you are
>>> doing.
>>>
>>> John Larkin's simulated inductors tend not to have any parallel capacitance.
>> 
>> The trick is to know when it matters. ESR and core loss are usually
>> more important.
>> 
>> I designed this surface-mount inductor for my Pockels Cell driver,
>> after several tries using commercial parts. They all smoked.
>> 
>> It's wound on a specially marked Sharpie pen that we have carefully
>> reserved.
>> 
>> https://www.highlandtechnology.com/Product/T850
>> 
>> The grey gap-pad gives it some extra cooling. The board has lots of
>> thermal vias down to the water-cooled baseplate.
>> 
>> 
>> 
>
>That sharpie formed coil looks like the turn-to-turn air-spacing is done 
>by eyeball? Can you find a bolt or screw with right pitch and diameter 
>to make winding easier?
>
>piglet

I recursively used another Sharpie to make some tic marks, to space
the turns.