Where can I buy a large analogue meter?...

[amdx]

On 4/14/2022 8:22 PM, Phil Allison wrote:

amdx wrote:
================
Whitless IDIOT whit3rd wrote:
Not so simple if you want accuracy. For one thing, the pointer ought to be counterweighted, not
just lightweight. For another, the glass pane that protects the pointer must be grounded,
or electrostatic charge will disrupt the reading. A d\'Arsonval movement is hard to scale up
and keep rugged; taut-band and such are improvements, but... servo is what\'s easily available for
a DIY project.
Ah, had not thought about the counter weight,

** Moving coil meters all have them - excepting maybe some edge reading types.

Essential to keep the scale linear.

https://thefactfactor.com/facts/pure_science/physics/ammeter-and-voltmeter/5931/



..... Phil

  Ya, I\'ve had enough meters apart that after it was said, I remembered
the counterweight on the opposite end of the pointer.
                                                     Mikek


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

 

[Jasen Betts]

On 2022-04-14, Commander Kinsey <CK1@nospam.com> wrote:
> Where can I buy a large analogue meter? Big enough to show to a room of people, about a foot long pointer.

use a regular size meter modified to have a glass back with an overhead projector.


--
Jasen.

 

[Jan Panteltje]

On a sunny day (Fri, 15 Apr 2022 13:12:19 +0100) it happened Martin Brown
<\'\'\'newspam\'\'\'@nonad.co.uk> wrote in <t3bnf4$17oc$1@gioia.aioe.org>:

On 15/04/2022 12:28, Jan Panteltje wrote:
On a sunny day (Fri, 15 Apr 2022 09:08:46 +0100) it happened \"Commander
Kinsey\" <CK1@nospam.com> wrote in <op.1knp8wj5mvhs6z@ryzen.lan>:

On Thu, 14 Apr 2022 19:37:00 +0100, Andy Bennet <aben@benj.com> wrote:

On 14/04/2022 11:45, Commander Kinsey wrote:
Where can I buy a large analogue meter? Big enough to show to a room of
people, about a foot long pointer.

just buy a cheap servo and put a chuffin great pointer on it!

Doesn\'t that mean me designing a PWM controller?

Just for the sake of argument,
and because posting to DIY and electronics.design
driving an RC servo is not that hard:
http://panteltje.com/panteltje/pic/camc_pic/
you will have to learn PIC asm ;-)

No. It can be done entirely in analogue. Servo motor controls a
potentiometer that balances out a potential divider to match the
incoming unknown voltage. Classic A level physics experiment.

Put a needle on the shaft of the pot and you are done!

It is how all servos were done once upon a time in the pre digital age.

This is about RC servos, easy to obtain anywhere at low cost for small ones,
https://learn.sparkfun.com/tutorials/hobby-servo-tutorial/all
scroll down to \'Control Signal\' for specs.

Those servos have a chip to drive the motor and a potmeter feeds back to it as you described.
The RC protocol is almost universal.
Maybe you could hack one but then you need to design the drive electronics and comparator.
Remember servo turns both ways... Would be a lot more work.
Else SHOW us what you have.

 

[Jasen Betts]

On 2022-04-15, Commander Kinsey <CK1@nospam.com> wrote:

On Thu, 14 Apr 2022 19:37:00 +0100, Andy Bennet <aben@benj.com> wrote:

On 14/04/2022 11:45, Commander Kinsey wrote:
Where can I buy a large analogue meter? Big enough to show to a room of
people, about a foot long pointer.

just buy a cheap servo and put a chuffin great pointer on it!

Doesn\'t that mean me designing a PWM controller?

To make PWM from DC volts you\'ll need a ramp generator and a comparator.
The ramp doen\'t need ot be perfectly linear, you can adjust the scale
markings.

--
Jasen.

 

[Jasen Betts]

On 2022-04-14, Peeler <trolltrap@valid.invalid> wrote:

On Thu, 14 Apr 2022 22:02:15 -0000 (UTC),
DecadentLinuxUserNumeroUno@decadence.org, an ESPECIALLY retarded,
troll-feeding, senile ASSHOLE, blathered, yet again:

feed the very dumbest, best-known, clinically insane troll and attention
whore, sociopathic PHucker himself!

Are you only here to chase this Kinsey chap. Occasionaly annoying,
but nowhere near worst.

--
Jasen.

 

[Peeler]

On Fri, 15 Apr 2022 19:57:07 +1000, Jock, better known as cantankerous
trolling senile geezer Rodent Speed, wrote:

<FLUSH the two subnormal sociopathic cretins\' endless absolutely idiotic
blather>

--
Another typical retarded \"conversation\" between Birdbrain and senile Rodent:

Senile Rodent: \" Did you ever dig a hole to bury your own shit?\"

Birdbrain: \"I do if there\'s no flush toilet around.\"

Senile Rodent: \"Yeah, I prefer camping like that, off by myself with
no dunnys around and have always buried the shit.\"

MID: <fv66kaFml0nU2@mid.individual.net>

 

[Peeler]

On Fri, 15 Apr 2022 13:12:13 -0000 (UTC), Jasen Betts, another brain dead,
troll-feeding senile asshole, blathered:

DecadentLinuxUserNumeroUno@decadence.org, an ESPECIALLY retarded,
troll-feeding, senile ASSHOLE, blathered, yet again:

feed the very dumbest, best-known, clinically insane troll and attention
whore, sociopathic PHucker himself!

Are you only here to chase this Kinsey chap. Occasionaly annoying,
but nowhere near worst.

In know, you senile assholes LOVE him for what he does, as he provides so
much more opportunities for you keep prattling happily and idiotically away
in your senile manner! It IS a typical senile thing! <BG>

 

[Peeler]

On Fri, 15 Apr 2022 11:28:38 GMT, Jan Panteltje, another troll-feeding,
senile idiot, driveled:


> Just for the sake of argument,

Yeah, I think all people who know him have had enough of that in this thread
and in all other \"threads\" started by that clinically insane pathological
attention whore and troll! <tsk>

 

[Peeler]

On Fri, 15 Apr 2022 13:02:54 -0000 (UTC), Jasen Betts, another brain dead,
troll-feeding senile asshole, blathered:

Doesn\'t that mean me designing a PWM controller?

To make PWM from DC volts you\'ll need a ramp generator and a comparator.
The ramp doen\'t need ot be perfectly linear, you can adjust the scale
markings.

LOL Is he playing his \"ask any, just any dumb questions\" game again? ROTFLOL
And you idiots are dumb and senile enough, again, not to notice what it is
about? Man, Usenet has come to STINK of SENILITY over the years!

 

[Peeler]

On Fri, 15 Apr 2022 12:43:53 -0000 (UTC), Jasen Betts, another brain dead,
troll-feeding senile asshole, blathered:


> use a regular size meter modified to have a glass back with an overhead projector.

But WHY, you demented senile assholes? That unemployable wanker doesn\'t need
it! He just makes up questions on the go of which he believes they will get
him the most attention for a while! As always, after a few days, the baited
senile assholes start noticing it and the howling and crying starts again...
until the next time when he comes back again to those very groups where he
had been so \"successful\", and the game starts all over again!

This all is about a TROLL and about TROLL-FEEDING SENILE ASSHOLES, and about
nothing else! LOL

 

[The Natural Philosopher]

On 15/04/2022 13:17, Ed Pawlowski wrote:

On 4/15/2022 5:11 AM, The Natural Philosopher wrote:
On 14/04/2022 20:45, Ed Pawlowski wrote:
On 4/14/2022 2:44 PM, Jock wrote:


Would you buy a 6.2 litre electric car?

I\'m not actually stupid enough to buy any electric car.

Wait 5 years.  They will be much better in many ways. New battery
material, greater range, charging times not much different that
pumping a tank of gas.
wait 5 years ... if they haven\'t got much better - same  battery
material, same range, charging times not much different than now -
then quietly forget the whole idea...


Obviously you have never seen the evolution of cars, airplanes,
electronics and the advances that can be made in five years.

Obviously you haven\'t .

Nothing much has changed in any of those fields - they are pretty mature
tech.

Cars today no longer have to be hand cranked to start
Nor have they been for the last 60 years

and the top models
> even have heaters in them.

I remember heaters in the 1950 cars

Amazing the progress they made.

Amazing the delusions you suffer from


--
“when things get difficult you just have to lie”

― Jean Claud Jüncker

 

[Ed Pawlowski]

On 4/15/2022 10:40 AM, The Natural Philosopher wrote:

On 15/04/2022 13:17, Ed Pawlowski wrote:
On 4/15/2022 5:11 AM, The Natural Philosopher wrote:
On 14/04/2022 20:45, Ed Pawlowski wrote:
On 4/14/2022 2:44 PM, Jock wrote:


Would you buy a 6.2 litre electric car?

I\'m not actually stupid enough to buy any electric car.

Wait 5 years.  They will be much better in many ways. New battery
material, greater range, charging times not much different that
pumping a tank of gas.
wait 5 years ... if they haven\'t got much better - same  battery
material, same range, charging times not much different than now -
then quietly forget the whole idea...


Obviously you have never seen the evolution of cars, airplanes,
electronics and the advances that can be made in five years.

Obviously you haven\'t .

Nothing much has changed in any of those fields - they are pretty mature
tech.

Cars today no longer have to be hand cranked to start
Nor have they been for the last 60 years

 and the top models
even have heaters in them.

I remember heaters in the 1950 cars

 Amazing the progress they made.

Amazing the delusions you suffer from

I don\'t understand why people go into engineering and science.
According to you, everything is already invented and will never get
better. Nothing can or will be improved.

 

[Phil Hobbs]

Jan Panteltje wrote:

On a sunny day (Fri, 15 Apr 2022 13:12:19 +0100) it happened Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote in <t3bnf4$17oc$1@gioia.aioe.org>:

On 15/04/2022 12:28, Jan Panteltje wrote:
On a sunny day (Fri, 15 Apr 2022 09:08:46 +0100) it happened \"Commander
Kinsey\" <CK1@nospam.com> wrote in <op.1knp8wj5mvhs6z@ryzen.lan>:

On Thu, 14 Apr 2022 19:37:00 +0100, Andy Bennet <aben@benj.com> wrote:

On 14/04/2022 11:45, Commander Kinsey wrote:
Where can I buy a large analogue meter? Big enough to show to a room of
people, about a foot long pointer.

just buy a cheap servo and put a chuffin great pointer on it!

Doesn\'t that mean me designing a PWM controller?

Just for the sake of argument,
and because posting to DIY and electronics.design
driving an RC servo is not that hard:
http://panteltje.com/panteltje/pic/camc_pic/
you will have to learn PIC asm ;-)

No. It can be done entirely in analogue. Servo motor controls a
potentiometer that balances out a potential divider to match the
incoming unknown voltage. Classic A level physics experiment.

Put a needle on the shaft of the pot and you are done!

It is how all servos were done once upon a time in the pre digital age.

This is about RC servos, easy to obtain anywhere at low cost for small ones,
https://learn.sparkfun.com/tutorials/hobby-servo-tutorial/all
scroll down to \'Control Signal\' for specs.

Those servos have a chip to drive the motor and a potmeter feeds back to it as you described.
The RC protocol is almost universal.
Maybe you could hack one but then you need to design the drive electronics and comparator.
Remember servo turns both ways... Would be a lot more work.
Else SHOW us what you have.

RC servos are the bomb. I\'ve used them to rotate diffraction gratings
in spectrometers.

For applications needing higher performance than a dial meter for demos,
you can get Oilite bronze bearings, titanium gears, high speed, and gobs
of torque for $150 in onesies.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Cindy Hamilton]

On 2022-04-15, The Natural Philosopher <tnp@invalid.invalid> wrote:

Obviously you have never seen the evolution of cars, airplanes,
electronics and the advances that can be made in five years.

Obviously you haven\'t .

Nothing much has changed in any of those fields - they are pretty mature
tech.

Coincidentally, I had a conversation this morning with an engineer who
works for Ford. He works in image processing; one of the projects
he worked on a few years ago enables the backup camera to initiate
braking if it sees an obstacle. He actually benefited from this
feature on a cloudy, gray day when he was backing up toward a gray car.

My husband gave him an idea for additional features for automatic
headlights. He said he\'d split his bonus with us if he gets one.

There really is a lot more going on than you realize, TNP.

--
Cindy Hamilton

 

[newshound]

On 15/04/2022 08:59, Commander Kinsey wrote:

On Thu, 14 Apr 2022 17:40:11 +0100, newshound <sradcliffe544@gmail.com


Easier to press a button on Ebay, I can\'t believe nobody makes them.

I can. Why would they?. As Martin says, just keep searching eBay.

To quickly see a value from a distance.

You will still be able to find large analogue pressure gauges, these are
still used in industry.

It\'s volts and amps I want.

Yes. And when, on the plant, they have volts they can drive an
electronic device that is going to be cheaper, more accurate, have
logging and remote transmission capability, be self illuminating, etc
etc. And when it stops working they know the volts have stopped too.

As I said, chemical plant still has a use for pressure gauges.

 

[Commander Kinsey]

On Fri, 15 Apr 2022 17:00:36 +0100, newshound <sradcliffe544@gmail.com> wrote:

On 15/04/2022 08:59, Commander Kinsey wrote:
On Thu, 14 Apr 2022 17:40:11 +0100, newshound <sradcliffe544@gmail.com


Easier to press a button on Ebay, I can\'t believe nobody makes them.

I can. Why would they?. As Martin says, just keep searching eBay.

To quickly see a value from a distance.

You will still be able to find large analogue pressure gauges, these are
still used in industry.

It\'s volts and amps I want.

Yes. And when, on the plant, they have volts they can drive an
electronic device that is going to be cheaper, more accurate, have
logging and remote transmission capability, be self illuminating, etc
etc. And when it stops working they know the volts have stopped too.

But there\'s the basic idea a big analogue thing gives you a rough reading fast, and a digital one gives you an accurate reading slowly. Compare analogue clock face to digital watch. Compare analogue speedometer to digital.

> As I said, chemical plant still has a use for pressure gauges.

Surely there are digital ones of those?

 

[Tim+]

Cindy Hamilton <hamilton@devnull.com> wrote:

On 2022-04-15, The Natural Philosopher <tnp@invalid.invalid> wrote:

Obviously you have never seen the evolution of cars, airplanes,
electronics and the advances that can be made in five years.

Obviously you haven\'t .

Nothing much has changed in any of those fields - they are pretty mature
tech.

Coincidentally, I had a conversation this morning with an engineer who
works for Ford. He works in image processing; one of the projects
he worked on a few years ago enables the backup camera to initiate
braking if it sees an obstacle. He actually benefited from this
feature on a cloudy, gray day when he was backing up toward a gray car.

My husband gave him an idea for additional features for automatic
headlights. He said he\'d split his bonus with us if he gets one.

There really is a lot more going on than you realize, TNP.

I think TNP has reached his “new tech” limit.

The automatic headlights on my car are quite amazing. I haven’t worked out
how the work but they’re a *lot* more sophisticated that a simple forward
pointing photocell. I suspect some fairly serious image processing is going
on.

Tim

--
Please don\'t feed the trolls

 

[Commander Kinsey]

On Fri, 15 Apr 2022 18:09:53 +0100, Clare Snyder <clare@snyder.on.ca> wrote:

On Fri, 15 Apr 2022 13:12:19 +0100, Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote:

On 15/04/2022 12:28, Jan Panteltje wrote:
On a sunny day (Fri, 15 Apr 2022 09:08:46 +0100) it happened \"Commander
Kinsey\" <CK1@nospam.com> wrote in <op.1knp8wj5mvhs6z@ryzen.lan>:

On Thu, 14 Apr 2022 19:37:00 +0100, Andy Bennet <aben@benj.com> wrote:

On 14/04/2022 11:45, Commander Kinsey wrote:
Where can I buy a large analogue meter? Big enough to show to a room of
people, about a foot long pointer.

just buy a cheap servo and put a chuffin great pointer on it!

Doesn\'t that mean me designing a PWM controller?

Just for the sake of argument,
and because posting to DIY and electronics.design
driving an RC servo is not that hard:
http://panteltje.com/panteltje/pic/camc_pic/
you will have to learn PIC asm ;-)

No. It can be done entirely in analogue. Servo motor controls a
potentiometer that balances out a potential divider to match the
incoming unknown voltage. Classic A level physics experiment.

Put a needle on the shaft of the pot and you are done!

It is how all servos were done once upon a time in the pre digital age.
But digital servos and arduinos make it SO much simpler!!!!!!

If you know how to use one, I\'ve never even seen one. Do I have to use Linux?

And please stop removing the other groups, there are people discussing this in the UK and in an electronics group.

 

[The Natural Philosopher]

On 15/04/2022 15:50, Ed Pawlowski wrote:

On 4/15/2022 10:40 AM, The Natural Philosopher wrote:
On 15/04/2022 13:17, Ed Pawlowski wrote:
On 4/15/2022 5:11 AM, The Natural Philosopher wrote:
On 14/04/2022 20:45, Ed Pawlowski wrote:
On 4/14/2022 2:44 PM, Jock wrote:


Would you buy a 6.2 litre electric car?

I\'m not actually stupid enough to buy any electric car.

Wait 5 years.  They will be much better in many ways. New battery
material, greater range, charging times not much different that
pumping a tank of gas.
wait 5 years ... if they haven\'t got much better - same  battery
material, same range, charging times not much different than now -
then quietly forget the whole idea...


Obviously you have never seen the evolution of cars, airplanes,
electronics and the advances that can be made in five years.

Obviously you haven\'t .

Nothing much has changed in any of those fields - they are pretty
mature tech.

Cars today no longer have to be hand cranked to start
Nor have they been for the last 60 years

  and the top models
even have heaters in them.

I remember heaters in the 1950 cars

  Amazing the progress they made.

Amazing the delusions you suffer from


I don\'t understand why people go into engineering and science. According
to you, everything is already invented and will never get better.
Nothing can or will be improved.

They go into engineering in order to ensure they dont waste millions of
other peoples money trying to invent stuff that will never work, because
it cannot work.

BEVs are very mature technology. There is only a bit left to improve.
Like aircraft and cars in general.

But believe what you will. Its nicer to beleive in warm cuddly
optimistic shit rather than face reality.


--
“Ideas are inherently conservative. They yield not to the attack of
other ideas but to the massive onslaught of circumstance\"

- John K Galbraith

 

[Peeler]

On Fri, 15 Apr 2022 17:00:36 +0100, newshound, yet another troll-feeding
senile idiot, blabbered again:


> As I said, chemical plant still has a use for pressure gauges.

As I said, the sociopathic Scottish wanker and attention whore still has a
use for otherwise useless senile assholes like you as long as they keep
feeding him. <G>