Path: ...!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail
NNTP-Posting-Date: Mon, 09 Sep 2024 21:39:44 +0000
From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Instead scopes
Date: Mon, 09 Sep 2024 14:40:18 -0700
Message-ID: <e3qudjl7epi80j41s6e39a1n1g69smop7k@4ax.com>
References: <vam90i$3bn2f$1@dont-email.me> <gjeucj5a7skeruudj8qcujc1f9b9t9o26r@4ax.com> <vanf8s$3h5er$1@dont-email.me> <mtjucjdqe2f91c2jsjp6011k0uvakuimog@4ax.com> <vap20i$1s5cl$1@solani.org> <8dv0djhj73b0ejudpkahnojgjk30i9rrbv@4ax.com> <je01dj177m9p0q25en4k2jm8u0bsj07t2j@4ax.com> <vaq1f2$jdj$1@dont-email.me> <vaq762$1ssg1$1@solani.org> <vb163a$1dt9b$1@dont-email.me> <0ns8djtqe7ct4k21h8ubnj944fonq9i0u0@4ax.com> <vbng48$2gmfl$1@dont-email.me> <vbnlbt$2hd7f$1@dont-email.me>
User-Agent: ForteAgent/8.00.32.1272
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Lines: 76
X-Trace: sv3-wCiTyzS+X3mxSy5GBjhWzIfAcuVGllmnLemvYvIY+CXMo8/5RRg32P5wF9VDU2jd2m0BY0H8USmxMU+!BP9zFJ3BBih/6bYgkeKW+T3wXPX0Fou3UjDKLorYn5lQoc41ANB0JvQ6kDlsFCHBYiEmmc8yc+zt!wkXhZw8=
X-Complaints-To: www.supernews.com/docs/abuse.html
X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html
X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly
X-Postfilter: 1.3.40
Bytes: 4124

On Mon, 9 Sep 2024 22:24:23 +0200, Jeroen Belleman
<jeroen@nospam.please> wrote:

>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

Stretching magnet wire makes it beautifully straight, but wrecks the
annealing and somewhat increases the resistance. Beauty over function.

My inductor is wound from  #14 AWG, which takes some muscle to pull
straight. Use horses maybe.

There's actually a drawing!