Maximum Power Point Tracking: Optimizing Solar Panels 58 Comments by: Maya Posch...

[Anthony William Sloman]

On Monday, January 9, 2023 at 5:47:17 AM UTC+11, Flyguy wrote:

On Sunday, January 8, 2023 at 6:41:15 AM UTC-8, bill....@ieee.org wrote:
On Sunday, January 8, 2023 at 5:52:35 PM UTC+11, Flyguy wrote:
On Saturday, January 7, 2023 at 11:31:33 AM UTC-8, Ed Lee wrote:
On Saturday, January 7, 2023 at 11:22:49 AM UTC-8, Fred Bloggs wrote:
On Saturday, January 7, 2023 at 2:16:50 PM UTC-5, Ed Lee wrote:
On Saturday, January 7, 2023 at 11:10:02 AM UTC-8, Fred Bloggs wrote:
On Saturday, January 7, 2023 at 1:42:05 PM UTC-5, Ed Lee wrote:
On Saturday, January 7, 2023 at 10:14:06 AM UTC-8, John Larkin wrote:
On Sat, 7 Jan 2023 09:34:02 -0800 (PST), Fred Bloggs <bloggs.fred...@gmail.com> wrote:

On Saturday, December 31, 2022 at 1:19:58 PM UTC-5, Ed Lee wrote:
snip
If you are going to be working on HV circuits (>240 V) ONLY use DMMs with a CAT certification (which cheap Chinese meters don\'t have).
https://www.fluke.com/en-us/learn/blog/safety/multimeter-guide
Which doesn\'t tell you much.

It tells you everything you need to know to make a purchasing decision. This IS NOT a designer\'s guide, Bozo.

This is sci.electronics.,design. The people who post here do imagine that they design electronics, even clowns like you.
The link you posted wasn\'t informative at the level you\'d need if you wanted to make an informed decision about buying a multimeter, not that you;d know anything about that

\"The latest UL standard for electrical test instruments is UL 61010B-1, which is a revision of 3111-1. It specifies the general safety requirements, such as material, design, and testing requirements, and the environmental conditions in which the standard applies. UL 3111-2-031 lists additional requirements for test probes. The requirements for hand-held current clamps, such as the current measuring portion of clamp meters, are included in UL 3111-2-032.

UL standards are gradually being harmonized with similar international standards, such as those published by IEC. Until this is completed, there may be significant differences between each group\'s standards. For example, IEC 61010-1 2nd Edition includes requirements for voltage-measuring instruments in CAT IV environments. UL 61010B-1 doesn\'t.\"

What Flyguy might be saying - if he knew what he was talking out - is that there are safety standards for multimeters. In the US they are published by the Underwriter
Laboratory.

I am WELL AWARE of UL and other testing labs.

But not aware enough top pull out an actual standard that said anything specific.

There are also international safety standards.

https://www.nema.org/standards/international/the-iec-and-nema

The International Electrotechnical Commission (IEC) headquartered in Geneva, Switzerland is the top level body.

A chinese multi-meter might well not conform to an American Underwriters Laboratory standard, but will probably conform to the relevant IEC standard, which isn\'t going to be much different.

Pure SPECULATION by Bozo completely UNVERIFIED by ANY facts whatsoever. But, why am I not surprised coming from Bill?

Sewage Sweeper didn\'t produce any facts of his own - and never does. When he\'s exposed to them, he ignores them, but he\'d great at recycling the abuse he gets, even when it is totally irrelevant.

A cheap chinese meter might be truly cheap and nasty, and correspondingly dangerous, but anybody who sold it to you would risk being sued if it was.

LOL! Just TRY suing a Chinese company - just TRY!!

You don\'t sue the manufacturer. You sue the retailer who sold you a device that wasn\'t fit for the purpose for which it was advertised.

It\'s more likely to be cheap because it was produced in high volume, rather than because the manufacturer cut any corners. I\'ve ran into one American instrument that didn\'t meet their published specifications, which is a slightly different kind of problem - it wasn\'t certainly wasn\'t cheap.

No, Bozo, they cut ALL KINDS of corners: https://www.youtube.com/watch?v=iGUiZT6kLDk

A youtube video is evidence?

> Notice that this meter has NO certification marks. And for GOOD REASON: it would NEVER pass.

Why should I care what some cheapskate idiot bought on E-bay? The device was CE marked, but the camera didn\'t linger longer to pick up the number of the relevant standard.

--
Bill Sloman, Sydney

 

[mmm]

Il 25/12/2022 22:20, John Larkin ha scritto:

We had enough turkey to last til next Thanksgiving, so we\'re doing
Italian. The problem is how to fill the cannelloni with the cheese and
sausage mix and not break them or have horrible gaps and air voids.

Here\'s the fix:

https://www.dropbox.com/s/a64i75enwdqxxxc/Pasta_Pusher.jpg?raw=1

I have three washer sizes ready because some of the things aren\'t
perfectly round tubes, kinda squashed.

the trick is the following:

https://ricette.giallozafferano.it/Cannelloni.html

see figures 28 to 30 ;-)

usually we ( in Italy ) don\'t use cylindrical pre-made \"cannelloni\" but
sheet of pasta, for dry pasta you need to pre-boil tha pasta, for fresh
egg-based pasta ( as the recipe ) is not needed

P.S. : for the stuffing follow your personal taste

just some ideas :

fresh cheese ( ricotta ) and/or bechamel and
1) spinach
2) mushrooms
3) minced meat ( or ragu\' )
4) 1+3 ;-)

with some effort the recipes can even be done \"vegan\"

 

[mmm]

Il 25/12/2022 22:20, John Larkin ha scritto:

We had enough turkey to last til next Thanksgiving, so we\'re doing
Italian. The problem is how to fill the cannelloni with the cheese and
sausage mix and not break them or have horrible gaps and air voids.

Here\'s the fix:

https://www.dropbox.com/s/a64i75enwdqxxxc/Pasta_Pusher.jpg?raw=1

I have three washer sizes ready because some of the things aren\'t
perfectly round tubes, kinda squashed.

the trick is the following:

https://ricette.giallozafferano.it/Cannelloni.html

see figures 28 to 30 ;-)

usually we ( in Italy ) don\'t use cylindrical pre-made \"cannelloni\" but
sheet of pasta, for dry pasta you need to pre-boil tha pasta, for fresh
egg-based pasta ( as the recipe ) is not needed

P.S. : for the stuffing follow your personal taste

just some ideas :

fresh cheese ( ricotta ) and/or bechamel and
1) spinach
2) mushrooms
3) minced meat ( or ragu\' )
4) 1+3 ;-)

with some effort the recipes can even be done \"vegan\"

 

[mmm]

Il 25/12/2022 22:20, John Larkin ha scritto:

We had enough turkey to last til next Thanksgiving, so we\'re doing
Italian. The problem is how to fill the cannelloni with the cheese and
sausage mix and not break them or have horrible gaps and air voids.

Here\'s the fix:

https://www.dropbox.com/s/a64i75enwdqxxxc/Pasta_Pusher.jpg?raw=1

I have three washer sizes ready because some of the things aren\'t
perfectly round tubes, kinda squashed.

the trick is the following:

https://ricette.giallozafferano.it/Cannelloni.html

see figures 28 to 30 ;-)

usually we ( in Italy ) don\'t use cylindrical pre-made \"cannelloni\" but
sheet of pasta, for dry pasta you need to pre-boil tha pasta, for fresh
egg-based pasta ( as the recipe ) is not needed

P.S. : for the stuffing follow your personal taste

just some ideas :

fresh cheese ( ricotta ) and/or bechamel and
1) spinach
2) mushrooms
3) minced meat ( or ragu\' )
4) 1+3 ;-)

with some effort the recipes can even be done \"vegan\"

 

[Phil Hobbs]

bitrex wrote:

On 1/3/2023 7:30 PM, Phil Hobbs wrote:
RichD wrote:
On January 1,  John Larkin wrote:
https://www.theregister.com/2022/07/18/electrical_engineers_extinction/?td=rt-9cp

I\'ve been thinking for some time now that EE schools don\'t turn out
people who like electricity, but maker culture might.

I advise younguns against an engineering degree, it\'s over-specialized,
and obsolete in 5 years.

Only if you get sucked into spending all your time on the flavor of
the month.  People who spend their time in school learning fundamental
things that are hard to master on your own (math, mostly) and then
pick up the other stuff as they go along don\'t get obsolete.  That\'s
not difficult to do in your average EE program even today, AFAICT.
Signals and systems, electrodynamics, solid state theory, and a bit of
quantum are all good things to know.

Spending all your time in school programming in Javascript or VHDL or
memorizing compliance requirements is not a good career move for an EE.

I tell them to get a physics education.  Study hard.  Then you have the
tools to do anything you want.

Physicists turn up everywhere, it\'s true.  Folks with bachelor\'s
degrees in physics can do most kinds of engineering, provided they\'re
willing to bone up on the specifics.  Of course there are some who
assume they know everything and just bull ahead till they fail, but,
well, human beings are everyplace.   Thing is, the basic
professional qualification for a physicist is a doctorate, whereas in
engineering it\'s a BSEE.

That is, first the academics, then the vocational training.

I agree that knowing the fundamentals cold is very important.
However, (a) physics isn\'t for everyone, by a long chalk; and (b)
there\'s a glorious intellectual heritage in engineering, so calling it
\'vocational training\' is pejorative.

Cheers

Phil \"Intermediate energy state\" Hobbs


Advanced engineering mathematics:

https://www.ebay.com/itm/194964206310

Which is pretty advanced, I don\'t know how many BS-type EEs know about
the orthogonality of Bessel functions, or regularly use contour
integration for anything.

You need to be able to do contour integration in a whole lot of signals
and systems. For instance, the proof that instability in a linear
system is the same as acausal behavior depends on it.

The exp(i omega t) in the Fourier integral means that you have to close
the contour in one half plane for positive time and the other for
negative time. If there are any poles inside the negative-time contour,
you get acausal response and exponential growth. (A very pretty result
first proved by E. C. Titchmarsh, I think.)

But not as advanced as \"Advanced Mathematical Methods for Scientists &
Engineers\", which is largely about perturbation methods, boundary layer
theory, and WKB approximations. Sounds fun I guess, I just got a used
copy from Amazon for $8

That\'s Bender & Orszag, right? By far my favorite math book of all
time. I just _love_ that one. The prof for my (first year grad)
asymptotic methods class was a former EE (Stephanos Venakides, may his
tribe increase). That helped a lot. Math classes taught by
mathematicians tend to be dry, because they regard the subject like
philosophy, whereas to a scientist or engineer, math is a technology of
thought.

BITD Arfken\'s \"Mathematical Methods for Physicists\" was one of the
standard math books for undergraduate physics, along with Levenson &
Redheffer\'s complex variables book, Boyce & di Prima on ODEs, Carrier &
Pearson for PDEs, and something on linear algebra. My linear alg class
was taught out of Schaum\'s Outline, believe it or not--super cheap and
actually a pretty good book. Oh, and a little book on the theoretical
side of calculus, so that you can prove theorems and stuff if you need to.

Fourier analysis, perturbation theory, asymptotic methods, cluster
expansions, tensor calculus, and Feynman path integrals were all taught
in physics classes. I took four EE classes in grad school--Tony Siegman
on lasers, Steve Harris on nonlinear optics, and Ron Bracewell on how to
think in k-space (aka reciprocal space and Fourier space), and Bernie
Widrow on DSP.

Cheers

Phil


--
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

 

[Phil Hobbs]

bitrex wrote:

On 1/3/2023 7:30 PM, Phil Hobbs wrote:
RichD wrote:
On January 1,  John Larkin wrote:
https://www.theregister.com/2022/07/18/electrical_engineers_extinction/?td=rt-9cp

I\'ve been thinking for some time now that EE schools don\'t turn out
people who like electricity, but maker culture might.

I advise younguns against an engineering degree, it\'s over-specialized,
and obsolete in 5 years.

Only if you get sucked into spending all your time on the flavor of
the month.  People who spend their time in school learning fundamental
things that are hard to master on your own (math, mostly) and then
pick up the other stuff as they go along don\'t get obsolete.  That\'s
not difficult to do in your average EE program even today, AFAICT.
Signals and systems, electrodynamics, solid state theory, and a bit of
quantum are all good things to know.

Spending all your time in school programming in Javascript or VHDL or
memorizing compliance requirements is not a good career move for an EE.

I tell them to get a physics education.  Study hard.  Then you have the
tools to do anything you want.

Physicists turn up everywhere, it\'s true.  Folks with bachelor\'s
degrees in physics can do most kinds of engineering, provided they\'re
willing to bone up on the specifics.  Of course there are some who
assume they know everything and just bull ahead till they fail, but,
well, human beings are everyplace.   Thing is, the basic
professional qualification for a physicist is a doctorate, whereas in
engineering it\'s a BSEE.

That is, first the academics, then the vocational training.

I agree that knowing the fundamentals cold is very important.
However, (a) physics isn\'t for everyone, by a long chalk; and (b)
there\'s a glorious intellectual heritage in engineering, so calling it
\'vocational training\' is pejorative.

Cheers

Phil \"Intermediate energy state\" Hobbs


Advanced engineering mathematics:

https://www.ebay.com/itm/194964206310

Which is pretty advanced, I don\'t know how many BS-type EEs know about
the orthogonality of Bessel functions, or regularly use contour
integration for anything.

You need to be able to do contour integration in a whole lot of signals
and systems. For instance, the proof that instability in a linear
system is the same as acausal behavior depends on it.

The exp(i omega t) in the Fourier integral means that you have to close
the contour in one half plane for positive time and the other for
negative time. If there are any poles inside the negative-time contour,
you get acausal response and exponential growth. (A very pretty result
first proved by E. C. Titchmarsh, I think.)

But not as advanced as \"Advanced Mathematical Methods for Scientists &
Engineers\", which is largely about perturbation methods, boundary layer
theory, and WKB approximations. Sounds fun I guess, I just got a used
copy from Amazon for $8

That\'s Bender & Orszag, right? By far my favorite math book of all
time. I just _love_ that one. The prof for my (first year grad)
asymptotic methods class was a former EE (Stephanos Venakides, may his
tribe increase). That helped a lot. Math classes taught by
mathematicians tend to be dry, because they regard the subject like
philosophy, whereas to a scientist or engineer, math is a technology of
thought.

BITD Arfken\'s \"Mathematical Methods for Physicists\" was one of the
standard math books for undergraduate physics, along with Levenson &
Redheffer\'s complex variables book, Boyce & di Prima on ODEs, Carrier &
Pearson for PDEs, and something on linear algebra. My linear alg class
was taught out of Schaum\'s Outline, believe it or not--super cheap and
actually a pretty good book. Oh, and a little book on the theoretical
side of calculus, so that you can prove theorems and stuff if you need to.

Fourier analysis, perturbation theory, asymptotic methods, cluster
expansions, tensor calculus, and Feynman path integrals were all taught
in physics classes. I took four EE classes in grad school--Tony Siegman
on lasers, Steve Harris on nonlinear optics, and Ron Bracewell on how to
think in k-space (aka reciprocal space and Fourier space), and Bernie
Widrow on DSP.

Cheers

Phil


--
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

 

[Phil Hobbs]

bitrex wrote:

On 1/3/2023 7:30 PM, Phil Hobbs wrote:
RichD wrote:
On January 1,  John Larkin wrote:
https://www.theregister.com/2022/07/18/electrical_engineers_extinction/?td=rt-9cp

I\'ve been thinking for some time now that EE schools don\'t turn out
people who like electricity, but maker culture might.

I advise younguns against an engineering degree, it\'s over-specialized,
and obsolete in 5 years.

Only if you get sucked into spending all your time on the flavor of
the month.  People who spend their time in school learning fundamental
things that are hard to master on your own (math, mostly) and then
pick up the other stuff as they go along don\'t get obsolete.  That\'s
not difficult to do in your average EE program even today, AFAICT.
Signals and systems, electrodynamics, solid state theory, and a bit of
quantum are all good things to know.

Spending all your time in school programming in Javascript or VHDL or
memorizing compliance requirements is not a good career move for an EE.

I tell them to get a physics education.  Study hard.  Then you have the
tools to do anything you want.

Physicists turn up everywhere, it\'s true.  Folks with bachelor\'s
degrees in physics can do most kinds of engineering, provided they\'re
willing to bone up on the specifics.  Of course there are some who
assume they know everything and just bull ahead till they fail, but,
well, human beings are everyplace.   Thing is, the basic
professional qualification for a physicist is a doctorate, whereas in
engineering it\'s a BSEE.

That is, first the academics, then the vocational training.

I agree that knowing the fundamentals cold is very important.
However, (a) physics isn\'t for everyone, by a long chalk; and (b)
there\'s a glorious intellectual heritage in engineering, so calling it
\'vocational training\' is pejorative.

Cheers

Phil \"Intermediate energy state\" Hobbs


Advanced engineering mathematics:

https://www.ebay.com/itm/194964206310

Which is pretty advanced, I don\'t know how many BS-type EEs know about
the orthogonality of Bessel functions, or regularly use contour
integration for anything.

You need to be able to do contour integration in a whole lot of signals
and systems. For instance, the proof that instability in a linear
system is the same as acausal behavior depends on it.

The exp(i omega t) in the Fourier integral means that you have to close
the contour in one half plane for positive time and the other for
negative time. If there are any poles inside the negative-time contour,
you get acausal response and exponential growth. (A very pretty result
first proved by E. C. Titchmarsh, I think.)

But not as advanced as \"Advanced Mathematical Methods for Scientists &
Engineers\", which is largely about perturbation methods, boundary layer
theory, and WKB approximations. Sounds fun I guess, I just got a used
copy from Amazon for $8

That\'s Bender & Orszag, right? By far my favorite math book of all
time. I just _love_ that one. The prof for my (first year grad)
asymptotic methods class was a former EE (Stephanos Venakides, may his
tribe increase). That helped a lot. Math classes taught by
mathematicians tend to be dry, because they regard the subject like
philosophy, whereas to a scientist or engineer, math is a technology of
thought.

BITD Arfken\'s \"Mathematical Methods for Physicists\" was one of the
standard math books for undergraduate physics, along with Levenson &
Redheffer\'s complex variables book, Boyce & di Prima on ODEs, Carrier &
Pearson for PDEs, and something on linear algebra. My linear alg class
was taught out of Schaum\'s Outline, believe it or not--super cheap and
actually a pretty good book. Oh, and a little book on the theoretical
side of calculus, so that you can prove theorems and stuff if you need to.

Fourier analysis, perturbation theory, asymptotic methods, cluster
expansions, tensor calculus, and Feynman path integrals were all taught
in physics classes. I took four EE classes in grad school--Tony Siegman
on lasers, Steve Harris on nonlinear optics, and Ron Bracewell on how to
think in k-space (aka reciprocal space and Fourier space), and Bernie
Widrow on DSP.

Cheers

Phil


--
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

 

[John Larkin]

On Wed, 11 Jan 2023 04:57:23 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Tue, 10 Jan 2023 14:57:00 -0800) it happened Joerg
news@analogconsultants.com> wrote in <k268puFi1h6U1@mid.individual.net>:


Number two: The same guy said that grounded gate circuits in RF stages
make no sense at all. Huh? I did one of those during my very first job
assignment when the ink on my degree was barely dry. And lots before as
a hobbyist.

Sure, used those in some projects.



Number three: Another professor said that we only need to learn all this
transistor-level stuff for the exam. Once we graduated this would all be
obsoleted by integrated circuits. That one took the cake. Still, it
seemed I was the only one who didn\'t believe such nonsense. However, it
provided me with the epiphany \"Ha! This is my niche!\". And that\'s what
it became. Never looked back.

This was at a European ivy league place which made it even more
disappointing.


In my school, a teacher (old one) was teaching us about transistors.
Transistors most of us were experimenting with at home..
So one guy asked;
\'Sir what exactly is a complementary pair?\'
Teacher got furious, thought it was a sex joke, and asked the guy to leave..
It took the whole class (most of use knew the answer) to convince the
teacher that that was a legitimate question.
Early sixties that was...
I think that teacher never had a transistor in his hands,, mostly lived in the tube ages.
Lucky we also had an other teacher who knew what he was doing..

The dean of my EE school couldn\'t properly pronounce \"transistor\" and
certainly never used one.

 

[John Larkin]

On Wed, 11 Jan 2023 04:57:23 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Tue, 10 Jan 2023 14:57:00 -0800) it happened Joerg
news@analogconsultants.com> wrote in <k268puFi1h6U1@mid.individual.net>:


Number two: The same guy said that grounded gate circuits in RF stages
make no sense at all. Huh? I did one of those during my very first job
assignment when the ink on my degree was barely dry. And lots before as
a hobbyist.

Sure, used those in some projects.



Number three: Another professor said that we only need to learn all this
transistor-level stuff for the exam. Once we graduated this would all be
obsoleted by integrated circuits. That one took the cake. Still, it
seemed I was the only one who didn\'t believe such nonsense. However, it
provided me with the epiphany \"Ha! This is my niche!\". And that\'s what
it became. Never looked back.

This was at a European ivy league place which made it even more
disappointing.


In my school, a teacher (old one) was teaching us about transistors.
Transistors most of us were experimenting with at home..
So one guy asked;
\'Sir what exactly is a complementary pair?\'
Teacher got furious, thought it was a sex joke, and asked the guy to leave..
It took the whole class (most of use knew the answer) to convince the
teacher that that was a legitimate question.
Early sixties that was...
I think that teacher never had a transistor in his hands,, mostly lived in the tube ages.
Lucky we also had an other teacher who knew what he was doing..

The dean of my EE school couldn\'t properly pronounce \"transistor\" and
certainly never used one.

 

[John Larkin]

On Wed, 11 Jan 2023 04:57:23 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Tue, 10 Jan 2023 14:57:00 -0800) it happened Joerg
news@analogconsultants.com> wrote in <k268puFi1h6U1@mid.individual.net>:


Number two: The same guy said that grounded gate circuits in RF stages
make no sense at all. Huh? I did one of those during my very first job
assignment when the ink on my degree was barely dry. And lots before as
a hobbyist.

Sure, used those in some projects.



Number three: Another professor said that we only need to learn all this
transistor-level stuff for the exam. Once we graduated this would all be
obsoleted by integrated circuits. That one took the cake. Still, it
seemed I was the only one who didn\'t believe such nonsense. However, it
provided me with the epiphany \"Ha! This is my niche!\". And that\'s what
it became. Never looked back.

This was at a European ivy league place which made it even more
disappointing.


In my school, a teacher (old one) was teaching us about transistors.
Transistors most of us were experimenting with at home..
So one guy asked;
\'Sir what exactly is a complementary pair?\'
Teacher got furious, thought it was a sex joke, and asked the guy to leave..
It took the whole class (most of use knew the answer) to convince the
teacher that that was a legitimate question.
Early sixties that was...
I think that teacher never had a transistor in his hands,, mostly lived in the tube ages.
Lucky we also had an other teacher who knew what he was doing..

The dean of my EE school couldn\'t properly pronounce \"transistor\" and
certainly never used one.

 

[Martin Brown]

On 02/01/2023 19:21, Jan Panteltje wrote:

On a sunny day (Mon, 2 Jan 2023 14:43:50 -0000 (UTC)) it happened \"Don\"
g@crcomp.net> wrote in <20230102a@crcomp.net>:

Jan Panteltje wrote:
John Larkin wrote>:


https://www.theregister.com/2022/07/18/electrical_engineers_extinction/?td=rt-9cp

I\'ve been thinking for some time now that EE schools don\'t turn out
people who like electricity, but maker culture might.

In the EE school I was in it was known that only \'hobbyists\' would pass the final exams.
The dropout in the first year was very very very high.
For the 30 or so in the first year, I was 1 of the 4 people at the final graduation party in the local pub,

Granny\'s radio with 10 transistors? You mean those old radio bulbs?

Give me some and I will build you a radio or TV (if you can find an old CRT).
I will wind the coils and transformers too, no calculations needed..
Because I DID all that.
Wait for that big EMP, likely 2024, keep your SDcards in an RF proof box
Oh yes, protect your solar panels too, also against the hurricanes etc..
OK digital TV is out, even with transistors, so after the EMP we will have
to go back to more simple AM FM (FM is simpler) radio.

Oh I can do software too .. I AM THE GREATEST pity after the EMP no more sjips to run it
And then thank Got no more microsore bloat.

Although Microshiv kills by a thousand cuts it\'s hard for me to earn $$$
without it.

My website hosting company \"Godaddy.com\" moved to Microsoft for my email.
What a lot of crap that is!! The old pop-email no longer works,
pop-email took a second here for incoming to add to my email system that goes back to 1998.

Are you sure about that?
Is it a very recent thing (as in failed 27/12/22 by any chance?)

POP worked fine on MS Office 365/Outlook with the server settings here:

https://support.microsoft.com/en-us/office/pop-imap-and-smtp-settings-8361e398-8af4-4e97-b147-6c6c4ac95353

YOu might find that you have some more admin access with some login ID
of the form \"administrator@__ISPname_oncascade.onmicrosoft.com

If your ISP has done it the same way that mine has (outsourcing).

Now I have to log in to that Microsore shit, a totally unsecure system with all your
emails on a microsoft server, slow as a snail, and you need multiple clicks in a browser
to read any incoming email and no way to add it to my pine (alpine) database
as created by fetchmail for pop email.

Your problem might be that your ancient email client doesn\'t support
OAuth2 and things stopped working in October when they enforced that.
Also check that your ISP has provided a sane default SPF record for your
domain otherwise emails sent to BT or other MS users will be dropped on
the floor ! Mine didn\'t

I have an other pop-email provider now, one I had for 10 years but now made primary.
Probably move the website to South America or Panama or Europe.
February is when panteltje.com should now go down (when next payment is due).
Godaddy will never be back.

Not a good idea to let your domain name lapse much better to transfer it
to somewhere else (but unless they have usurious renewal fees it doesn\'t
really matter). Hosting can be with an entirely different business and
is usually sufficiently trouble free that cheapest deal wins hands down.

--
Regards,
Martin Brown

 

[Martin Brown]

On 02/01/2023 19:21, Jan Panteltje wrote:

On a sunny day (Mon, 2 Jan 2023 14:43:50 -0000 (UTC)) it happened \"Don\"
g@crcomp.net> wrote in <20230102a@crcomp.net>:

Jan Panteltje wrote:
John Larkin wrote>:


https://www.theregister.com/2022/07/18/electrical_engineers_extinction/?td=rt-9cp

I\'ve been thinking for some time now that EE schools don\'t turn out
people who like electricity, but maker culture might.

In the EE school I was in it was known that only \'hobbyists\' would pass the final exams.
The dropout in the first year was very very very high.
For the 30 or so in the first year, I was 1 of the 4 people at the final graduation party in the local pub,

Granny\'s radio with 10 transistors? You mean those old radio bulbs?

Give me some and I will build you a radio or TV (if you can find an old CRT).
I will wind the coils and transformers too, no calculations needed..
Because I DID all that.
Wait for that big EMP, likely 2024, keep your SDcards in an RF proof box
Oh yes, protect your solar panels too, also against the hurricanes etc..
OK digital TV is out, even with transistors, so after the EMP we will have
to go back to more simple AM FM (FM is simpler) radio.

Oh I can do software too .. I AM THE GREATEST pity after the EMP no more sjips to run it
And then thank Got no more microsore bloat.

Although Microshiv kills by a thousand cuts it\'s hard for me to earn $$$
without it.

My website hosting company \"Godaddy.com\" moved to Microsoft for my email.
What a lot of crap that is!! The old pop-email no longer works,
pop-email took a second here for incoming to add to my email system that goes back to 1998.

Are you sure about that?
Is it a very recent thing (as in failed 27/12/22 by any chance?)

POP worked fine on MS Office 365/Outlook with the server settings here:

https://support.microsoft.com/en-us/office/pop-imap-and-smtp-settings-8361e398-8af4-4e97-b147-6c6c4ac95353

YOu might find that you have some more admin access with some login ID
of the form \"administrator@__ISPname_oncascade.onmicrosoft.com

If your ISP has done it the same way that mine has (outsourcing).

Now I have to log in to that Microsore shit, a totally unsecure system with all your
emails on a microsoft server, slow as a snail, and you need multiple clicks in a browser
to read any incoming email and no way to add it to my pine (alpine) database
as created by fetchmail for pop email.

Your problem might be that your ancient email client doesn\'t support
OAuth2 and things stopped working in October when they enforced that.
Also check that your ISP has provided a sane default SPF record for your
domain otherwise emails sent to BT or other MS users will be dropped on
the floor ! Mine didn\'t

I have an other pop-email provider now, one I had for 10 years but now made primary.
Probably move the website to South America or Panama or Europe.
February is when panteltje.com should now go down (when next payment is due).
Godaddy will never be back.

Not a good idea to let your domain name lapse much better to transfer it
to somewhere else (but unless they have usurious renewal fees it doesn\'t
really matter). Hosting can be with an entirely different business and
is usually sufficiently trouble free that cheapest deal wins hands down.

--
Regards,
Martin Brown

 

[Martin Brown]

On 02/01/2023 19:21, Jan Panteltje wrote:

On a sunny day (Mon, 2 Jan 2023 14:43:50 -0000 (UTC)) it happened \"Don\"
g@crcomp.net> wrote in <20230102a@crcomp.net>:

Jan Panteltje wrote:
John Larkin wrote>:


https://www.theregister.com/2022/07/18/electrical_engineers_extinction/?td=rt-9cp

I\'ve been thinking for some time now that EE schools don\'t turn out
people who like electricity, but maker culture might.

In the EE school I was in it was known that only \'hobbyists\' would pass the final exams.
The dropout in the first year was very very very high.
For the 30 or so in the first year, I was 1 of the 4 people at the final graduation party in the local pub,

Granny\'s radio with 10 transistors? You mean those old radio bulbs?

Give me some and I will build you a radio or TV (if you can find an old CRT).
I will wind the coils and transformers too, no calculations needed..
Because I DID all that.
Wait for that big EMP, likely 2024, keep your SDcards in an RF proof box
Oh yes, protect your solar panels too, also against the hurricanes etc..
OK digital TV is out, even with transistors, so after the EMP we will have
to go back to more simple AM FM (FM is simpler) radio.

Oh I can do software too .. I AM THE GREATEST pity after the EMP no more sjips to run it
And then thank Got no more microsore bloat.

Although Microshiv kills by a thousand cuts it\'s hard for me to earn $$$
without it.

My website hosting company \"Godaddy.com\" moved to Microsoft for my email.
What a lot of crap that is!! The old pop-email no longer works,
pop-email took a second here for incoming to add to my email system that goes back to 1998.

Are you sure about that?
Is it a very recent thing (as in failed 27/12/22 by any chance?)

POP worked fine on MS Office 365/Outlook with the server settings here:

https://support.microsoft.com/en-us/office/pop-imap-and-smtp-settings-8361e398-8af4-4e97-b147-6c6c4ac95353

YOu might find that you have some more admin access with some login ID
of the form \"administrator@__ISPname_oncascade.onmicrosoft.com

If your ISP has done it the same way that mine has (outsourcing).

Now I have to log in to that Microsore shit, a totally unsecure system with all your
emails on a microsoft server, slow as a snail, and you need multiple clicks in a browser
to read any incoming email and no way to add it to my pine (alpine) database
as created by fetchmail for pop email.

Your problem might be that your ancient email client doesn\'t support
OAuth2 and things stopped working in October when they enforced that.
Also check that your ISP has provided a sane default SPF record for your
domain otherwise emails sent to BT or other MS users will be dropped on
the floor ! Mine didn\'t

I have an other pop-email provider now, one I had for 10 years but now made primary.
Probably move the website to South America or Panama or Europe.
February is when panteltje.com should now go down (when next payment is due).
Godaddy will never be back.

Not a good idea to let your domain name lapse much better to transfer it
to somewhere else (but unless they have usurious renewal fees it doesn\'t
really matter). Hosting can be with an entirely different business and
is usually sufficiently trouble free that cheapest deal wins hands down.

--
Regards,
Martin Brown

 

[Dan Purgert]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

On 2023-01-05, John Larkin wrote:

On Thu, 5 Jan 2023 13:42:02 -0000 (UTC), Dan Purgert <dan@djph.net
wrote:
[...]
yay, getting out of a hot shower

Why get out? Hot showers are a key component of design.

How else am I gonna write on the now-foggy mirror?

[...]
You have been insulted by Sloman, so are officially on your way to
being an electronics design engineer.

Who\'s that? It\'s only been Don posting back to me ...

Let me know if I can help.

Thanks for the offer.

Have you played with Raspberry Pi?

Yeah, they\'re fun little linux boxes.

Most of my tinkering for the last 7 or so years has been with AVR
chips, originally prompted by getting an arduino. But I somewhat
quickly fell out with their library / toolchain; and started doing
things \"the hard way\" with C (and now assembly). In many cases, just
working around the peripherals doing some \"pointless homework
project(tm)\" just to have something to do.




-----BEGIN PGP SIGNATURE-----
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=q45d
-----END PGP SIGNATURE-----

--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860

 

[Dan Purgert]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

On 2023-01-05, John Larkin wrote:

On Thu, 5 Jan 2023 13:42:02 -0000 (UTC), Dan Purgert <dan@djph.net
wrote:
[...]
yay, getting out of a hot shower

Why get out? Hot showers are a key component of design.

How else am I gonna write on the now-foggy mirror?

[...]
You have been insulted by Sloman, so are officially on your way to
being an electronics design engineer.

Who\'s that? It\'s only been Don posting back to me ...

Let me know if I can help.

Thanks for the offer.

Have you played with Raspberry Pi?

Yeah, they\'re fun little linux boxes.

Most of my tinkering for the last 7 or so years has been with AVR
chips, originally prompted by getting an arduino. But I somewhat
quickly fell out with their library / toolchain; and started doing
things \"the hard way\" with C (and now assembly). In many cases, just
working around the peripherals doing some \"pointless homework
project(tm)\" just to have something to do.




-----BEGIN PGP SIGNATURE-----
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=q45d
-----END PGP SIGNATURE-----

--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860

 

[Dan Purgert]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

On 2023-01-05, John Larkin wrote:

On Thu, 5 Jan 2023 13:42:02 -0000 (UTC), Dan Purgert <dan@djph.net
wrote:
[...]
yay, getting out of a hot shower

Why get out? Hot showers are a key component of design.

How else am I gonna write on the now-foggy mirror?

[...]
You have been insulted by Sloman, so are officially on your way to
being an electronics design engineer.

Who\'s that? It\'s only been Don posting back to me ...

Let me know if I can help.

Thanks for the offer.

Have you played with Raspberry Pi?

Yeah, they\'re fun little linux boxes.

Most of my tinkering for the last 7 or so years has been with AVR
chips, originally prompted by getting an arduino. But I somewhat
quickly fell out with their library / toolchain; and started doing
things \"the hard way\" with C (and now assembly). In many cases, just
working around the peripherals doing some \"pointless homework
project(tm)\" just to have something to do.




-----BEGIN PGP SIGNATURE-----
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=q45d
-----END PGP SIGNATURE-----

--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860

 

[John Larkin]

On Wed, 4 Jan 2023 11:34:05 -0700, Don Y <blockedofcourse@foo.invalid>
wrote:

On 1/4/2023 8:06 AM, Dan Purgert wrote:
On 2023-01-03, Don Y wrote:
On 1/3/2023 9:42 AM, bitrex wrote:
And then people complain the US doesn\'t make electronics anymore. Challenging
programs with a high washout rate AND it doesn\'t pay too good? Wow hard to
believe everyone isn\'t jumping on that one, lol

Nowadays, even \"makers\" don\'t *make* electronics. They just buy
modules and write some code. Modern packages are just too tedious
for hobbyists; you want successes to encourage your efforts, not
failures.

The no-lead stuff and/or exposed bottom pad stuff is certainly difficult
to handle... but even 0402 is \"doable\" with naught more than a decent
magnifying glass (e.g. Optivisors)

I use a lot of QFN32 and SOT23-6 packages. In a pinch, I can prototype
with them without a template (using a syringe-based paste dispenser and
a Leister).

Get an assortment of cheap surface-mount adapters.

https://www.dropbox.com/s/9av93ul8148zdjm/Z356_SN2.JPG?raw=1

https://www.dropbox.com/s/ifnvctd6yg68dtu/US8s.jpg?raw=1

But, that\'s not really \"engineering\". Does an architect dig the hole for
foundation of the building he\'s designing? A chef raise the produce
he\'ll use in the meals he prepares?

I think building and testing circuits is engineering. We\'re not
scientists. \"Engineer\" meant guys with crowbars and oily rags, not
equation provers.

Power pads and dpak type things can be soldered with a good iron and
maybe a bit of pre-heating with a heat gun.

Wire-wrap a prototype: \"Boy, THAT was tedious!\"
Hand-tape a PCB layout: \"OK, we won\'t be doing THAT again!\"
Repeat with EDA tools: \"And, *this* isn\'t any more appealing!\"
There\'s a *reason* we have technicians and layout guys. And,
why they aren\'t called \"engineers\". (not to denegrate the work
they do but, rather, to realize that there are better uses for
an engineer\'s time)

I don\'t want any engineering techs. Engineers should be realtime
hands-on. Solder. Probe around. See the scope waveforms changing
yourself. Feel the parts to see if they are hot.

 

[John Larkin]

On Wed, 4 Jan 2023 11:34:05 -0700, Don Y <blockedofcourse@foo.invalid>
wrote:

On 1/4/2023 8:06 AM, Dan Purgert wrote:
On 2023-01-03, Don Y wrote:
On 1/3/2023 9:42 AM, bitrex wrote:
And then people complain the US doesn\'t make electronics anymore. Challenging
programs with a high washout rate AND it doesn\'t pay too good? Wow hard to
believe everyone isn\'t jumping on that one, lol

Nowadays, even \"makers\" don\'t *make* electronics. They just buy
modules and write some code. Modern packages are just too tedious
for hobbyists; you want successes to encourage your efforts, not
failures.

The no-lead stuff and/or exposed bottom pad stuff is certainly difficult
to handle... but even 0402 is \"doable\" with naught more than a decent
magnifying glass (e.g. Optivisors)

I use a lot of QFN32 and SOT23-6 packages. In a pinch, I can prototype
with them without a template (using a syringe-based paste dispenser and
a Leister).

Get an assortment of cheap surface-mount adapters.

https://www.dropbox.com/s/9av93ul8148zdjm/Z356_SN2.JPG?raw=1

https://www.dropbox.com/s/ifnvctd6yg68dtu/US8s.jpg?raw=1

But, that\'s not really \"engineering\". Does an architect dig the hole for
foundation of the building he\'s designing? A chef raise the produce
he\'ll use in the meals he prepares?

I think building and testing circuits is engineering. We\'re not
scientists. \"Engineer\" meant guys with crowbars and oily rags, not
equation provers.

Power pads and dpak type things can be soldered with a good iron and
maybe a bit of pre-heating with a heat gun.

Wire-wrap a prototype: \"Boy, THAT was tedious!\"
Hand-tape a PCB layout: \"OK, we won\'t be doing THAT again!\"
Repeat with EDA tools: \"And, *this* isn\'t any more appealing!\"
There\'s a *reason* we have technicians and layout guys. And,
why they aren\'t called \"engineers\". (not to denegrate the work
they do but, rather, to realize that there are better uses for
an engineer\'s time)

I don\'t want any engineering techs. Engineers should be realtime
hands-on. Solder. Probe around. See the scope waveforms changing
yourself. Feel the parts to see if they are hot.

 

[John Larkin]

On Wed, 4 Jan 2023 11:34:05 -0700, Don Y <blockedofcourse@foo.invalid>
wrote:

On 1/4/2023 8:06 AM, Dan Purgert wrote:
On 2023-01-03, Don Y wrote:
On 1/3/2023 9:42 AM, bitrex wrote:
And then people complain the US doesn\'t make electronics anymore. Challenging
programs with a high washout rate AND it doesn\'t pay too good? Wow hard to
believe everyone isn\'t jumping on that one, lol

Nowadays, even \"makers\" don\'t *make* electronics. They just buy
modules and write some code. Modern packages are just too tedious
for hobbyists; you want successes to encourage your efforts, not
failures.

The no-lead stuff and/or exposed bottom pad stuff is certainly difficult
to handle... but even 0402 is \"doable\" with naught more than a decent
magnifying glass (e.g. Optivisors)

I use a lot of QFN32 and SOT23-6 packages. In a pinch, I can prototype
with them without a template (using a syringe-based paste dispenser and
a Leister).

Get an assortment of cheap surface-mount adapters.

https://www.dropbox.com/s/9av93ul8148zdjm/Z356_SN2.JPG?raw=1

https://www.dropbox.com/s/ifnvctd6yg68dtu/US8s.jpg?raw=1

But, that\'s not really \"engineering\". Does an architect dig the hole for
foundation of the building he\'s designing? A chef raise the produce
he\'ll use in the meals he prepares?

I think building and testing circuits is engineering. We\'re not
scientists. \"Engineer\" meant guys with crowbars and oily rags, not
equation provers.

Power pads and dpak type things can be soldered with a good iron and
maybe a bit of pre-heating with a heat gun.

Wire-wrap a prototype: \"Boy, THAT was tedious!\"
Hand-tape a PCB layout: \"OK, we won\'t be doing THAT again!\"
Repeat with EDA tools: \"And, *this* isn\'t any more appealing!\"
There\'s a *reason* we have technicians and layout guys. And,
why they aren\'t called \"engineers\". (not to denegrate the work
they do but, rather, to realize that there are better uses for
an engineer\'s time)

I don\'t want any engineering techs. Engineers should be realtime
hands-on. Solder. Probe around. See the scope waveforms changing
yourself. Feel the parts to see if they are hot.

 

[server]

Ed Lee <edward.ming.lee@gmail.com> wrote:
> But not immediately. I tested 400V occasionally, but couple of them died while testing 12V. I am wondering it 400V weaken the meter.

High voltage can destroy resistors, but this seem to be quite fast.

> The old CenTech meters are 1000V, but the new models are 250V. Why even bother to have 50V more than the next range of 200V. Perhaps it\'s just same design with new label, when they got enough reports/complaints.

Lot of folks live in countries where line voltage is 230V. So 50 volts
makes a lot of difference.

> I am wondering if it\'s worth picking up some of the older 1000V models off ebay.

I know nothing about CenTech meters. But I have several \"DT830B\"
meters. Available schematics shows 3 resistors in series for 1000V.
My oldest one have 2 resistors. Newest one have single resistor.
Standard miniature resistors are rated for 250V, one can get
better ones, but I doubt that one can get cheaply 1000V capable
ones. Still, meter is marked as 1000V DC, 700V AC (the same
as old meters).

--
Waldek Hebisch