Re: OT: some electronics for a speed controlled electromagnetic gun

On Sun, 16 Jun 2024 05:15:41 GMT, Jan Panteltje <alien@comet.invalid>
wrote:

On a sunny day (Sat, 15 Jun 2024 07:55:40 -0700) it happened john larkin
<jl@650pot.com> wrote in <mjar6jtpa9o9thp9pvhlolqdu3hiemqumv@4ax.com>:
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On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
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On a sunny day (Fri, 14 Jun 2024 09:21:24 -0700) it happened john larkin
<jl@650pot.com> wrote in <dero6j1eempndp4h10029un6kfp75kfna6@4ax.com>:
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On Fri, 14 Jun 2024 03:13:16 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
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New dart launcher may be better way to inject animals with drugs
Electromagnetic prototype could improve manufacturing
https://www.sciencedaily.com/releases/2024/06/240613161144.htm
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Here the circuit etc..:
https://www.mdpi.com/2227-7080/12/5/69

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Fig 6 is horrible.
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Hardly anybody does good circuit design these days.

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Are you sure you understand the circuit?
What is wrong with it according to you?

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Aside from being ugly, at least three things.

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Name them!!!

Am I the only person here who designs electronics? Sigh, OK.

The resistive voltage divider R2 R3 wastes voltage and power.

The SCR high-side switch is crazy for several reasons.

The optocoupler into the second dc/dc converter makes no sense and is
probably unreliable.

Why do some people use optocouplers where both the input and output
are grounded? It becomes a low-beta NPN transisor.

Why switch only the second dc/dc converter?

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As to bad design, astronauts now stuck on the ISS because the Boeing return module is defective.
Billions they did spend of tax money
US becoming more and more a lost empire...

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That's fine, since the US never was an empire. But we did mostly
conquer the world by being what other people want to be.
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Use Street View all over the world. Most places look like a suburb of
Houston.
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China just did a sample return from the backside of the moon.

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Why?

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Human beings have curiosity
that is how we evolve.
The sample will teach us about how our universe (forming of the Moon specfically) happened.

We already have lots of moon dirt. It's not very interesting. The
Chinese thing is a political stunt. An expensive one.

Why would dirt from the farside of he moon be any different from the
rest of the moon dirt?

And if we can have a permanent base there, say as an in-between stop for further exploration of space.

Space is mostly vacuum. Why do we need to kill humans to "explore"
vacuum?

Later, when US astronuts land on Mars (if ever) they will find Chinese restaurants there
and they better bring some Chinese currency so they can pay forlanding rights and food.
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A recent study suggests that people who go to Mars will have kidney
damage.

https://www.sciencedaily.com/releases/2024/06/240611130413.htm

Humans in space make no sense.