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From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: OT: some electronics for a speed controlled electromagnetic gun
Date: Sun, 16 Jun 2024 15:06:01 GMT
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On a sunny day (Sun, 16 Jun 2024 06:56:50 -0700) it happened john larkin
<jl@650pot.com> wrote in <7nqt6j1uoakdnnqk37bvlj5vss03damatg@4ax.com>:

>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>:
>>
>>>On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje <alien@comet.invalid>
>>>wrote:
>>>
>>>>On a sunny day (Fri, 14 Jun 2024 09:21:24 -0700) it happened john larkin
>>>><jl@650pot.com> wrote in <dero6j1eempndp4h10029un6kfp75kfna6@4ax.com>:
>>>>
>>>>>On Fri, 14 Jun 2024 03:13:16 GMT, Jan Panteltje <alien@comet.invalid>
>>>>>wrote:
>>>>>
>>>>>>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
>>>>>>
>>>>>>Here the circuit etc..:
>>>>>> https://www.mdpi.com/2227-7080/12/5/69
>>>>>
>>>>>Fig 6 is horrible.
>>>>>
>>>>>Hardly anybody does good circuit design these days.
>>>>
>>>>Are you sure you understand the circuit?
>>>>What is wrong with it according to you?
>>>
>>>Aside from being ugly, at least three things.
>>
>>Name them!!!
>
>Am I the only person here who designs electronics? Sigh, OK.

ego shows


>The resistive voltage divider R2 R3 wastes voltage and power.

Well, I guess they need to limit voltage on the 1000 uF caps
Also it does a nice capacitor discharge when not in use.




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

Yes it could probably be done simpler with SCR cathode connect to ground.


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

Na, optos are reliable.

I do not know where 'CHARGE' is connected to?


>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?

Maybe they need the 12V for something?
Trigger?
 
>>>>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...
>>>
>>>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.
>>>
>>>Use Street View all over the world. Most places look like a suburb of
>>>Houston.
>>>
>>>>
>>>>China just did a sample return from the backside of the moon.
>>>
>>>Why?
>>
>>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.

No, we have only moon dust from the front side of the moon.
It seems the backside is quite different.
The recent US moon probe crashed....


>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?

Large parts of the earth will become inhabitable due to climate change
humans will need to 'get out of this place' if they want their species to persist.
Satellites of other planets, maybe even other planets, or even other solar systems..


>>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.
>>
>
>A recent study suggests that people who go to Mars will have kidney
>damage.
>
>https://www.sciencedaily.com/releases/2024/06/240611130413.htm

I did read that.
And long time in no-gravity conditions causes muscle degeneration 
so maybe this species is doomed.. (in the end it likely will be)
If the half senile nutcase byethen persist his war mongering a
bit of radioactivity from the nuking in WW3 may cause more damage
than a few weeks trip on a Chinese? rocket to a safer place in space.


>Humans in space make no sense.

Driving around in the ISS is like driving around the block no end,
with that spirit Columbus would not have left Europe....