Re: Instead scopes

On 9/9/24 20:51, piglet 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
 

It /does/ look a bit messy.
To get nice even spacing in hand-wound coils, I would pull on
the wire until it gave just a bit, then wind it tightly spaced
on a mandrel of appropriate size and finally, stick a toothpick,
or something like that, transversely through the turns, 'screwing'
it from one end to the other. My coils ended up looking perfectly
neat.
Jeroen Belleman