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From: john larkin <jlarkin_highland_tech>
Newsgroups: sci.electronics.design
Subject: Re: Instead scopes
Date: Sun, 01 Sep 2024 07:09:46 -0700
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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.