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From: piglet <erichpwagner@hotmail.com>
Newsgroups: sci.electronics.design
Subject: Re: Instead scopes
Date: Mon, 9 Sep 2024 19:51:52 +0100
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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