Discussion:
OT: some electronics for a speed controlled electromagnetic gun
(too old to reply)
Jan Panteltje
2024-06-14 03:13:16 UTC
Permalink
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
john larkin
2024-06-14 16:21:24 UTC
Permalink
Post by Jan Panteltje
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
https://www.mdpi.com/2227-7080/12/5/69
Fig 6 is horrible.

Hardly anybody does good circuit design these days.
Jan Panteltje
2024-06-15 05:57:23 UTC
Permalink
On a sunny day (Fri, 14 Jun 2024 09:21:24 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
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
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?

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...

China just did a sample return from the backside of the moon.
john larkin
2024-06-15 14:55:40 UTC
Permalink
Post by Jan Panteltje
On a sunny day (Fri, 14 Jun 2024 09:21:24 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
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
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.
Post by Jan Panteltje
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.
Post by Jan Panteltje
China just did a sample return from the backside of the moon.
Why?
Cursitor Doom
2024-06-15 22:09:42 UTC
Permalink
Post by john larkin
Post by Jan Panteltje
On a sunny day (Fri, 14 Jun 2024 09:21:24 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
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
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.
Post by Jan Panteltje
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.
You were doing good up until some evil bastards mounted a stealth
takeover. Now you have some demented freak as president who can barely
contain his bowel movements who does everything the deep state tells
him to. Stick a piece of paper under his nose and he'll sign it
regardless of what it says.
You don't see the same coverage of Diaper Joe in the US as the rest of
the world sees. I can tell you now the unsanitised version ain't
pretty. Diaper Joe and his crack-head son have made America the
laughing stock of the world.
Post by john larkin
Use Street View all over the world. Most places look like a suburb of
Houston.
Post by Jan Panteltje
China just did a sample return from the backside of the moon.
Why?
Jan Panteltje
2024-06-16 05:15:41 UTC
Permalink
On a sunny day (Sat, 15 Jun 2024 07:55:40 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
On a sunny day (Fri, 14 Jun 2024 09:21:24 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
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
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!!!
Post by john larkin
Post by Jan Panteltje
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.
Post by Jan Panteltje
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.
And if we can have a permanent base there, say as an in-between stop for further exploration of space.
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.
john larkin
2024-06-16 13:56:50 UTC
Permalink
Post by Jan Panteltje
On a sunny day (Sat, 15 Jun 2024 07:55:40 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
On a sunny day (Fri, 14 Jun 2024 09:21:24 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
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
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.

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?
Post by Jan Panteltje
Post by john larkin
Post by Jan Panteltje
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.
Post by Jan Panteltje
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.

Why would dirt from the farside of he moon be any different from the
rest of the moon dirt?
Post by Jan Panteltje
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?
Post by Jan Panteltje
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

Humans in space make no sense.
Jan Panteltje
2024-06-16 15:06:01 UTC
Permalink
On a sunny day (Sun, 16 Jun 2024 06:56:50 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
On a sunny day (Sat, 15 Jun 2024 07:55:40 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
On a sunny day (Fri, 14 Jun 2024 09:21:24 -0700) it happened john larkin
Post by john larkin
Post by Jan Panteltje
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
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
Post by john larkin
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.
Post by john larkin
The SCR high-side switch is crazy for several reasons.
Yes it could probably be done simpler with SCR cathode connect to ground.
Post by john larkin
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?
Post by john larkin
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?
Post by john larkin
Post by Jan Panteltje
Post by john larkin
Post by Jan Panteltje
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.
Post by Jan Panteltje
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....
Post by john larkin
Why would dirt from the farside of he moon be any different from the
rest of the moon dirt?
Post by Jan Panteltje
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..
Post by john larkin
Post by Jan Panteltje
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.
Post by john larkin
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....
Phil Hobbs
2024-06-16 17:47:43 UTC
Permalink
<sniiip>
Humans in space make no sense.
Most of us don’t make that much down here either. ;)

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC /
Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics
john larkin
2024-06-16 18:38:42 UTC
Permalink
On Sun, 16 Jun 2024 17:47:43 -0000 (UTC), Phil Hobbs
<sniiip>
Humans in space make no sense.
Most of us don’t make that much down here either. ;)
Cheers
Phil Hobbs
1000 years ago 80% of the population was farmers who barely grew
enough to survive. Clothes were so valuable that people were killed
for theirs. Most people were illiterate and lived in the dark when the
sun went down.

Progress has made us so efficient that probably 80% of the
developed-world population now has zero net productivity.
Phil Hobbs
2024-06-16 19:30:32 UTC
Permalink
Post by john larkin
On Sun, 16 Jun 2024 17:47:43 -0000 (UTC), Phil Hobbs
<sniiip>
Humans in space make no sense.
Most of us don’t make that much down here either. ;)
Cheers
Phil Hobbs
1000 years ago 80% of the population was farmers who barely grew
enough to survive. Clothes were so valuable that people were killed
for theirs. Most people were illiterate and lived in the dark when the
sun went down.
Progress has made us so efficient that probably 80% of the
developed-world population now has zero net productivity.
Well, given that 100% of what gets counted as productivity is devoted to
things that quickly pass away, it’s hard to get too worked up about that.

Materialism (of either the philosophical or the vernacular sort) ends in
futility.(*)

Cheers

Phil “ray of sunshine” Hobbs

(*) Fortunately, both kinds are mistaken.
--
Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC /
Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics
john larkin
2024-06-16 20:35:45 UTC
Permalink
On Sun, 16 Jun 2024 19:30:32 -0000 (UTC), Phil Hobbs
Post by Phil Hobbs
Post by john larkin
On Sun, 16 Jun 2024 17:47:43 -0000 (UTC), Phil Hobbs
<sniiip>
Humans in space make no sense.
Most of us don?t make that much down here either. ;)
Cheers
Phil Hobbs
1000 years ago 80% of the population was farmers who barely grew
enough to survive. Clothes were so valuable that people were killed
for theirs. Most people were illiterate and lived in the dark when the
sun went down.
Progress has made us so efficient that probably 80% of the
developed-world population now has zero net productivity.
Well, given that 100% of what gets counted as productivity is devoted to
things that quickly pass away, it’s hard to get too worked up about that.
Materialism (of either the philosophical or the vernacular sort) ends in
futility.(*)
Cheers
Phil “ray of sunshine” Hobbs
(*) Fortunately, both kinds are mistaken.
Well, people do like food, energy, shelter, and transportation.
Material things. I'd guess that 20% of our population makes that
stuff.

The rest, entertainment and fancy cooking and legal services and art
and music and most government and most education is kinda luxuries.

Medicine is a big biz and mostly worth it.

Electronic design is maybe half fluff these days, entertainment.
Jeff Liebermann
2024-06-16 22:48:09 UTC
Permalink
Post by john larkin
1000 years ago 80% of the population was farmers who barely grew
enough to survive.
Those farmers might have been starving, but they had resources. For
example, they could grow a large family and sell off the kids if they
have a bad harvest. They could organize a mob and pillage the
neighbors crops. Every culture has a festival to mark the beginning
of the harvest season, which oddly coincides with the beginning of the
pillaging season.
Post by john larkin
Clothes were so valuable that people were killed
for theirs.
That's a rather high price to pay for wearing the latest fashions.
Unfortunately, little has changed over the last 1000 years:
"BEWARE AND BE SAFE !!! SNEAKERS GETTING ROBBED / STOLEN"

Post by john larkin
Most people were illiterate
Today, people are more literate but continue to do stupid things.
Literacy is not a good substitute for intelligence or a cure for
stupidity.
Post by john larkin
and lived in the dark when the sun went down.
That would be the dark ages. They didn't last long to do much real
damage. Also, we still have regular planned power outage holidays to
remind us of those days. Here's a map of California showing past PSPS
(Public Safety Power Shutoff) events.
Post by john larkin
Progress has made us so efficient that probably 80% of the
developed-world population now has zero net productivity.
In FY 2023 the IRS processed 162 million individual tax returns.
That's out of a total population of 333 million. Subtract 74.4
million children age 0 to 17, most of whom are not required to file a
return:
162 / (333 - 74.4) = 63% of US adult population is productive
or
100 - 63 = 37% are non-productive.
--
Jeff Liebermann ***@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558
john larkin
2024-06-16 23:58:47 UTC
Permalink
Post by Jeff Liebermann
Post by john larkin
1000 years ago 80% of the population was farmers who barely grew
enough to survive.
Those farmers might have been starving, but they had resources. For
example, they could grow a large family and sell off the kids if they
have a bad harvest. They could organize a mob and pillage the
neighbors crops. Every culture has a festival to mark the beginning
of the harvest season, which oddly coincides with the beginning of the
pillaging season.
Post by john larkin
Clothes were so valuable that people were killed
for theirs.
That's a rather high price to pay for wearing the latest fashions.
"BEWARE AND BE SAFE !!! SNEAKERS GETTING ROBBED / STOLEN"
http://youtu.be/4LHrCLiMKZQ
Post by john larkin
Most people were illiterate
Today, people are more literate but continue to do stupid things.
Literacy is not a good substitute for intelligence or a cure for
stupidity.
Post by john larkin
and lived in the dark when the sun went down.
That would be the dark ages.
Nearly all ages until most people could afford gas and then
electricity. Even tallow candles were too expensive for most folk, and
fat/oil was for cooling and eating, not burning.

https://www.amazon.com/World-Lit-Only-Fire-Renaissance/dp/0316545562
Post by Jeff Liebermann
They didn't last long to do much real
damage. Also, we still have regular planned power outage holidays to
remind us of those days. Here's a map of California showing past PSPS
(Public Safety Power Shutoff) events.
Post by john larkin
Progress has made us so efficient that probably 80% of the
developed-world population now has zero net productivity.
In FY 2023 the IRS processed 162 million individual tax returns.
That's out of a total population of 333 million. Subtract 74.4
million children age 0 to 17, most of whom are not required to file a
162 / (333 - 74.4) = 63% of US adult population is productive
or
100 - 63 = 37% are non-productive.
Just being paid doesn't mean people are productive.

Retired people, and people with passive incomes, and useless people
pay taxes too.

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