Lower voltage diode the other side of a step up transformer?...

[John Larkin]

On Tue, 07 Mar 2023 06:09:11 +1100, \"Rod Speed\"
<rod.speed.aaa@gmail.com> wrote:

On Tue, 07 Mar 2023 02:20:53 +1100, John Larkin
jlarkin@highlandsnipmetechnology.com> wrote:

On Mon, 06 Mar 2023 06:41:42 +1100, \"Rod Speed\"
rod.speed.aaa@gmail.com> wrote:

On Mon, 06 Mar 2023 04:38:42 +1100, John Larkin
jlarkin@highlandsnipmetechnology.com> wrote:

On Mon, 06 Mar 2023 04:25:27 +1100, \"Rod Speed\"
rod.speed.aaa@gmail.com> wrote:

On Sun, 05 Mar 2023 22:15:03 +1100, Max Demian
max_demian@bigfoot.com
wrote:

On 04/03/2023 21:32, Rod Speed wrote:
On Sun, 05 Mar 2023 06:44:41 +1100, John Larkin
jlarkin@highlandsnipmetechnology.com> wrote:

Hunching over a screen and mousing all day is bad for the body and
soul.
Not convinced.

I make myself get some exercize every day (just got soaked and
froze) and that helps.

https://www.health.harvard.edu/mind-and-mood/exercise-is-an-all-natural-treatment-to-fight-depression
I don\'t get depression.

Yes, life really is pointless.

Your certainly is and isnt anything even remotely resembling a life
either.

Women alone make life good.

Virtually all of my mates have ditched theirs with one on the verge of
doing that.


Are they going gay?

Nope. One of them has gone thru 3 now and was clearly
trying for a new one but when she told him what he should
be doing about the grandkids living in his house with his
druggy son, walked out the door at her place without saying
anything and never went back again and now appears to have
given up on finding another. He has always said they are
\'strange cattle\'.

Yikes. That explains a lot!

The previous one got involved with someone
else who is the same age as her oldest son, the druggy, and
has now married him after his dad encouraged him to do that.

I really believe that, for most men, women have chemicals that make us
happy. Pheremones.

Clearly not the case with you lot given that most
of you have gone thru more than one woman.

All my women had pheremones.

One crackpot theory (mine) is that gay guys are so
promiscuous because their partners aren\'t satisfying. They prowl and
poke all night; Real Men mate and fall asleep.

But hardly any stick with the same woman
for life even when the early ones don\'t die.

Shop around a bit maybe. Some people, when single, latch onto the
first person they bump into. It\'s like electronic design, don\'t freeze
the architecture too soon.

But people change, so a good mate for life doesn\'t always happen.

The first AIDS cases around here had had an estimated 3000 sexual
partners. That\'s kinda extreme. Monogamy is, among other things,
preventive against STDs. That\'s probably the origin of many moral and
legal rules.

Not to mention food, skiing, and
electronics.

The skiing sucks.

Yep, always has, always will do.

It\'s wonderful, about the only sport you can do all day and take your
mind far away from the routine. It\'s beautiful up in the mountains and
you can zoom around like a bird, or get a rum+coke at the bar.

 

[Rod Speed]

On Tue, 07 Mar 2023 07:27:50 +1100, John Larkin
<jlarkin@highlandsnipmetechnology.com> wrote:

On Tue, 07 Mar 2023 06:09:11 +1100, \"Rod Speed\"
rod.speed.aaa@gmail.com> wrote:

On Tue, 07 Mar 2023 02:20:53 +1100, John Larkin
jlarkin@highlandsnipmetechnology.com> wrote:

On Mon, 06 Mar 2023 06:41:42 +1100, \"Rod Speed\"
rod.speed.aaa@gmail.com> wrote:

On Mon, 06 Mar 2023 04:38:42 +1100, John Larkin
jlarkin@highlandsnipmetechnology.com> wrote:

On Mon, 06 Mar 2023 04:25:27 +1100, \"Rod Speed\"
rod.speed.aaa@gmail.com> wrote:

On Sun, 05 Mar 2023 22:15:03 +1100, Max Demian
max_demian@bigfoot.com
wrote:

On 04/03/2023 21:32, Rod Speed wrote:
On Sun, 05 Mar 2023 06:44:41 +1100, John Larkin
jlarkin@highlandsnipmetechnology.com> wrote:

Hunching over a screen and mousing all day is bad for the body
and
soul.
Not convinced.

I make myself get some exercize every day (just got soaked and
froze) and that helps.

https://www.health.harvard.edu/mind-and-mood/exercise-is-an-all-natural-treatment-to-fight-depression
I don\'t get depression.

Yes, life really is pointless.

Your certainly is and isnt anything even remotely resembling a life
either.

Women alone make life good.

Virtually all of my mates have ditched theirs with one on the verge of
doing that.


Are they going gay?

Nope. One of them has gone thru 3 now and was clearly
trying for a new one but when she told him what he should
be doing about the grandkids living in his house with his
druggy son, walked out the door at her place without saying
anything and never went back again and now appears to have
given up on finding another. He has always said they are
\'strange cattle\'.

Yikes. That explains a lot!

Nope. And he\'s right about that.

The previous one got involved with someone
else who is the same age as her oldest son, the druggy, and
has now married him after his dad encouraged him to do that.

I really believe that, for most men, women have chemicals that make us
happy. Pheremones.

Clearly not the case with you lot given that most
of you have gone thru more than one woman.

All my women had pheremones.

Sure, but clearly few of them made you happy enough to stick with them.

One crackpot theory (mine) is that gay guys are so
promiscuous because their partners aren\'t satisfying. They prowl and
poke all night; Real Men mate and fall asleep.

But hardly any stick with the same woman
for life even when the early ones don\'t die.

Shop around a bit maybe.

Hell of a lot more than a bit. Virtually all
of you lot haven\'t had just the one for life.

Some people, when single, latch onto the
first person they bump into.

And most of you lot go thru a lot more than just the one you first marry.

It\'s like electronic design, don\'t freeze
the architecture too soon.

But people change, so a good mate for life doesn\'t always happen.

Hardly ever happen with you lot in fact.

The first AIDS cases around here had had an estimated 3000 sexual
partners. That\'s kinda extreme. Monogamy is, among other things,
preventive against STDs.

But hardly any of you lot are monogamous,
even after the first marraige.

That\'s probably the origin of many moral and
legal rules.

Dunno, its less clear that the ancients could work
that sort of thing out and certainly doesnt explain
the eskimos etc.

Not to mention food, skiing, and
electronics.

The skiing sucks.

Yep, always has, always will do.

It\'s wonderful, about the only sport you can do all day and take your
mind far away from the routine. It\'s beautiful up in the mountains and
you can zoom around like a bird, or get a rum+coke at the bar.

And get well and truly broken. No thanks.

 

[Peeler]

On Tue, 07 Mar 2023 08:13:28 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

<FLUSH the abnormal trolling senile cretin\'s latest trollshit unread>

--
Tim+ about trolling Rodent Speed:
He is by far the most persistent troll who seems to be able to get under the
skin of folk who really should know better. Since when did arguing with a
troll ever achieve anything (beyond giving the troll pleasure)?
MID: <1421057667.659518815.743467.tim.downie-gmail.com@news.individual.net>

 

[Fred Bloggs]

On Sunday, February 26, 2023 at 4:45:34 AM UTC-5, Commander Kinsey wrote:
> Can I put a diode BEFORE a step up transformer so I can use a lower voltage diode for half wave rectification?

What a BRILLIANT idea! And here a bunch of hack engineers have been messing with that stuff for over a hundred years now, AND NOT A SINGLE ONE OF THEM EVER THOUGHT OF DOING THAT!

 

[Anthony William Sloman]

On Tuesday, March 7, 2023 at 4:10:26 AM UTC+11, boB wrote:

On Mon, 6 Mar 2023 01:35:41 -0800 (PST), Anthony William Sloman
bill....@ieee.org> wrote:
On Monday, March 6, 2023 at 4:09:22?AM UTC+11, John Larkin wrote:
On Sat, 04 Mar 2023 23:36:56 -0700, boB <b...@K7IQ.com> wrote:
On Fri, 3 Mar 2023 20:13:46 -0800 (PST), Anthony William Sloman <bill.....@ieee.org> wrote:
On Saturday, March 4, 2023 at 2:04:20?PM UTC+11, John Larkin wrote:
On Sat, 04 Mar 2023 01:23:17 -0000, \"Commander Kinsey\" <C...@nospam.com> wrote:
On Sun, 26 Feb 2023 16:13:19 -0000, John Larkin <jla...@highlandsnipmetechnology.com> wrote:
On Sun, 26 Feb 2023 09:45:26 -0000, \"Commander Kinsey\" <C...@nospam.com> wrote:

snip

The reason that loading a transformer doesn\'t make it saturate is
because the primary excitation flux and the flux from the secondary
load current cancel. Loading a transformer reduces the core flux.

Not exactly. The core flux has to keep increasing to generate the voltage the drives the current into the external load. Because you drive transformers with AC the voltage eventually reverses, ideally before you saturate the core.

Bill, I think this assumes that the voltage is regulated with
feedback.

Driving the transformer with, say, just grid voltage would do what JL
is talking about because the IR drop when loaded, reduces the
volt-seconds imposed on the core which is what causes saturation.
Yes. Shorting the secondary will drop the core flux about in half.

Pretty sure that\'s it anyway.

Sloman has lectured us hundreds of times about how we should design and not buy transformers, so it\'s hilarious that he doesn\'t understand the basics.

Joh Larkin\'s reading comprehension is down there with Flyguys. I\'m all in favour of buying off-shelf transformers if you can find one to do the job..

The problem is that you rarely can.

As to why he thinks I don\'t understand the basics of transformer design, the answer has to be that he doesn\'t, and thinks that boB does, which is hilarious.

That\'s OK, Bill. But at least we know what works for transformer
design in a product.

There may be some confusion between inductor magnetics and transformer
magnetics design going on down there. It\'s all the same thing in the
end.

Not exactly. To understand a transforner you need to understand the transformer equation

V1 = L1.dI1/dt + M. dI2/dt

V2 = M.dI1/dt + L2. dI2/dt

where M is the mutual inductance between the primary L1 and the secondary L2 and M= k (L1.L2)^0.5

k is the coupling cofficient, typically 0.999 for ungapped ferrite pot cores but dropping to perhaps 0.98 for gapped pot core and RM core pairs.

Transformer texts are remarkably reluctant to use it - I finally got to see it in Siemens application note and found it very informative.

It lets you stop thinking about leakage inductance. which is a very unhelpful concept.

Try operating a transformer designed for 50/60 Hz operation with
decreasing frequency and watch the magnetizing current rise as it
starts to go into saturation. Lower frequency means higher
volt-seconds.

Of course it does.

> You have to reduce the excitation voltage as you decrease the frequency to keep the V-S from increasing and saturating the core in a transformer.

There are more fundamental ways of looking at it.

--
Bill Sloman, Sydney

 

[Commander Kinsey]

On Mon, 27 Feb 2023 11:17:04 -0000, Jasen Betts <usenet@revmaps.no-ip.org> wrote:

On 2023-02-26, Commander Kinsey <CK1@nospam.com> wrote:
Can I put a diode BEFORE a step up transformer so I can use a lower voltage diode for half wave rectification?

Garbage groups deleted.

Oooh! Your group is best is it? There\'s nothing wrong with the other groups, and they have people equally as knowledgeable as you.

So non-garbage groups re-added, pompous ass.

Sure yuo can put a diode in series with the primary, but you\'ll need a larger
(higher voltage) primary winding on the transformer so as to avoid repeated
magnetic saturation of the core.

And even that that\'s not going to make rectification on the secondary
easier. All you end up doing is increasing resistive losses in
the primary.

Thee question was would I get DC or AC out the other end?

 

[Sylvia Else]

On 05-Mar-23 5:11 am, Peeler wrote:

On Sat, 04 Mar 2023 09:42:09 -0800, John Larkin, another obviously brain
dead, troll-feeding senile asshole, blathered:


Trying to make a high voltage DC supply?

Nope, troll-feeding senile idiot: He ONLY tries to get as much attention as
possible from all the assorted troll-feeding senile assholes in these
groups!

So why haven\'t you kill-filed any thread he starts? If you had, you
wouldn\'t be seeing his posts, or any response to them.

Sylvia.

 

[Rod Speed]

On Tue, 07 Mar 2023 15:55:59 +1100, Sylvia Else <sylvia@email.invalid>
wrote:

On 05-Mar-23 5:11 am, Peeler wrote:
On Sat, 04 Mar 2023 09:42:09 -0800, John Larkin, another obviously brain
dead, troll-feeding senile asshole, blathered:

Trying to make a high voltage DC supply?
Nope, troll-feeding senile idiot: He ONLY tries to get as much
attention as
possible from all the assorted troll-feeding senile assholes in these
groups!

So why haven\'t you kill-filed any thread he starts?

Because then that pathetic wretch would have nothing to post about.

> If you had, you wouldn\'t be seeing his posts, or any response to them.

But then that pathetic wretch would have nothing to post about.

That\'s all it ever does, respond to every single
post that pathetic wretch has decided to stalk.

 

[Peeler]

On Tue, 7 Mar 2023 15:55:59 +1100, Sylvia Else, the troll-loving senile
idiot, blathered:

So why haven\'t you kill-filed any thread he starts? If you had, you
wouldn\'t be seeing his posts, or any response to them.

Sylvia.

I never killfile anyone, moron!

 

[Peeler]

On Tue, 07 Mar 2023 16:57:13 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

<FLUSH the abnormal trolling senile cretin\'s latest trollshit unread>

--
Richard addressing senile Rodent Speed:
\"Shit you\'re thick/pathetic excuse for a troll.\"
MID: <ogoa38$pul$1@news.mixmin.net>

 

[Fredxx]

On 07/03/2023 04:46, Commander Kinsey wrote:

On Mon, 27 Feb 2023 11:17:04 -0000, Jasen Betts
usenet@revmaps.no-ip.org> wrote:

On 2023-02-26, Commander Kinsey <CK1@nospam.com> wrote:
Can I put a diode BEFORE a step up transformer so I can use a lower
voltage diode for half wave rectification?

Garbage groups deleted.

Oooh!  Your group is best is it?  There\'s nothing wrong with the other
groups, and they have people equally as knowledgeable as you.

So non-garbage groups re-added, pompous ass.

Sure yuo can put a diode in series with the primary, but you\'ll need a
larger
(higher voltage) primary winding on the transformer so as to avoid
repeated
magnetic saturation of the core.

And even that that\'s not going to make rectification on the secondary
easier. All you end up doing is increasing resistive losses in
the primary.

Thee question was would I get DC or AC out the other end?

If you don\'t know the answer, then I might suggest you give up now.

If you had a modicum of intelligence, you would be running LTSpice to
find out yourself. But we all know that\'s well beyond your capabilities.

 

[Smolley]

On Tue, 07 Mar 2023 14:20:08 +0000, Fredxx wrote:

On 07/03/2023 04:46, Commander Kinsey wrote:
On Mon, 27 Feb 2023 11:17:04 -0000, Jasen Betts
usenet@revmaps.no-ip.org> wrote:

On 2023-02-26, Commander Kinsey <CK1@nospam.com> wrote:
Can I put a diode BEFORE a step up transformer so I can use a lower
voltage diode for half wave rectification?

Garbage groups deleted.

Oooh!  Your group is best is it?  There\'s nothing wrong with the other
groups, and they have people equally as knowledgeable as you.

So non-garbage groups re-added, pompous ass.

Sure yuo can put a diode in series with the primary, but you\'ll need a
larger (higher voltage) primary winding on the transformer so as to
avoid repeated magnetic saturation of the core.

And even that that\'s not going to make rectification on the secondary
easier. All you end up doing is increasing resistive losses in the
primary.

Thee question was would I get DC or AC out the other end?

If you don\'t know the answer, then I might suggest you give up now.

If you had a modicum of intelligence, you would be running LTSpice to
find out yourself. But we all know that\'s well beyond your capabilities.

Wow, is that still about..?

 

[Fredxx]

On 07/03/2023 14:50, Smolley wrote:

On Tue, 07 Mar 2023 14:20:08 +0000, Fredxx wrote:

On 07/03/2023 04:46, Commander Kinsey wrote:
On Mon, 27 Feb 2023 11:17:04 -0000, Jasen Betts
usenet@revmaps.no-ip.org> wrote:

On 2023-02-26, Commander Kinsey <CK1@nospam.com> wrote:
Can I put a diode BEFORE a step up transformer so I can use a lower
voltage diode for half wave rectification?

Garbage groups deleted.

Oooh!  Your group is best is it?  There\'s nothing wrong with the other
groups, and they have people equally as knowledgeable as you.

So non-garbage groups re-added, pompous ass.

Sure yuo can put a diode in series with the primary, but you\'ll need a
larger (higher voltage) primary winding on the transformer so as to
avoid repeated magnetic saturation of the core.

And even that that\'s not going to make rectification on the secondary
easier. All you end up doing is increasing resistive losses in the
primary.

Thee question was would I get DC or AC out the other end?

If you don\'t know the answer, then I might suggest you give up now.

If you had a modicum of intelligence, you would be running LTSpice to
find out yourself. But we all know that\'s well beyond your capabilities.

Wow, is that still about..?

It\'s very much alive and kicking. It doesn\'t take much to model a diode,
a resistor and an inductor to check how much power is dissipated.

It actually shows that pretty much the full AC voltage waveform is
developed across the transformer, the current going from zero to a a
value dependent on component choice (mainly determined by inductance) in
a near (offset) sinusoidal waveform.

Sadly, all the above is well beyond Kinsey\'s capabilities.

 

[John Larkin]

On Tue, 07 Mar 2023 16:57:13 +1100, \"Rod Speed\"
<rod.speed.aaa@gmail.com> wrote:

On Tue, 07 Mar 2023 15:55:59 +1100, Sylvia Else <sylvia@email.invalid
wrote:

On 05-Mar-23 5:11 am, Peeler wrote:
On Sat, 04 Mar 2023 09:42:09 -0800, John Larkin, another obviously brain
dead, troll-feeding senile asshole, blathered:

Trying to make a high voltage DC supply?
Nope, troll-feeding senile idiot: He ONLY tries to get as much
attention as
possible from all the assorted troll-feeding senile assholes in these
groups!

So why haven\'t you kill-filed any thread he starts?

Because then that pathetic wretch would have nothing to post about.

If you had, you wouldn\'t be seeing his posts, or any response to them.

But then that pathetic wretch would have nothing to post about.

Like Sloman, his hatred is his only life. Neither designs electronics.

Sad, and bad for unmoderated forums.

High voltage power supplies are certainly worth discussing.

 

[Sjouke Burry]

On 07.03.23 16:16, John Larkin wrote:

On Tue, 07 Mar 2023 16:57:13 +1100, \"Rod Speed\"
rod.speed.aaa@gmail.com> wrote:

On Tue, 07 Mar 2023 15:55:59 +1100, Sylvia Else <sylvia@email.invalid
wrote:

On 05-Mar-23 5:11 am, Peeler wrote:
On Sat, 04 Mar 2023 09:42:09 -0800, John Larkin, another obviously brain
dead, troll-feeding senile asshole, blathered:

Trying to make a high voltage DC supply?
Nope, troll-feeding senile idiot: He ONLY tries to get as much
attention as
possible from all the assorted troll-feeding senile assholes in these
groups!

So why haven\'t you kill-filed any thread he starts?

Because then that pathetic wretch would have nothing to post about.

If you had, you wouldn\'t be seeing his posts, or any response to them.

But then that pathetic wretch would have nothing to post about.

Like Sloman, his hatred is his only life. Neither designs electronics.

Sad, and bad for unmoderated forums.

High voltage power supplies are certainly worth discussing.

Just hook such a supply to each troll.
N.B. First wet them with lots of salt water...............

 

[Peeler]

On Tue, 07 Mar 2023 07:16:49 -0800, John Larkin, another obviously brain
dead, troll-feeding senile asshole, blathered:


> Like Sloman, his hatred is his only life. Neither designs electronics.

Like every truly demented idiotic senile asshole, you KEEP feeding the two
dumbest, most obnoxious and PROVEN clinically insane trolls on Usenet:
senile sociopathic Rod and attention-starved sociopathic Kinsey! It\'s
fucking HILARIOUS! Just HOW senile are all you troll-feeding senile bullshit
artists? LMAO

 

[Anthony William Sloman]

On Wednesday, March 8, 2023 at 2:17:05 AM UTC+11, John Larkin wrote:

On Tue, 07 Mar 2023 16:57:13 +1100, \"Rod Speed\"
rod.sp...@gmail.com> wrote:

On Tue, 07 Mar 2023 15:55:59 +1100, Sylvia Else <syl...@email.invalid
wrote:

On 05-Mar-23 5:11 am, Peeler wrote:
On Sat, 04 Mar 2023 09:42:09 -0800, John Larkin, another obviously brain
dead, troll-feeding senile asshole, blathered:

Trying to make a high voltage DC supply?
Nope, troll-feeding senile idiot: He ONLY tries to get as much
attention as
possible from all the assorted troll-feeding senile assholes in these
groups!

So why haven\'t you kill-filed any thread he starts?

Because then that pathetic wretch would have nothing to post about.

If you had, you wouldn\'t be seeing his posts, or any response to them.

But then that pathetic wretch would have nothing to post about.

Like Sloman, his hatred is his only life. Neither designs electronics.

John Larkin\'s grasp of reality isn\'t impressive. He does resent not being flattered as fulsomely as he thinks he deserves.

> Sad, and bad for unmoderated forums.

As if John Larkin made positive contributions.

> High voltage power supplies are certainly worth discussing.

John Larkin will boast about the ones he has put together - design is perhaps too strong a word - but he won\'t pay any attention to anybody else\'s.

Small ones tend to be built around high-turns ratio transformers which have to be designed for the specific application. The secondary tends to have a relatively low resonant frequency, which is what lead Peter Baxandall to invent the class-D oscillator

http://sophia-elektronica.com/Baxandall1959JM.pdf

It would be nice to see one with printed windings, but John doesn\'t know about that kid of stuff.

--
Bill Sloman, Sydney

 

[rbowman]

On Tue, 07 Mar 2023 16:57:13 +1100, Rod Speed wrote:

> Because then that pathetic wretch would have nothing to post about.

I believe Peeler has set a record for never having posted anything with
redeeming social value. Most trolls at least throw out something that will
elicit a reply other than FOAD.

 

[Peeler]

On 8 Mar 2023 03:40:11 GMT, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:

I believe Peeler has set a record for never having posted anything with
redeeming social value. Most trolls at least throw out something that will
elicit a reply other than FOAD.

You are mistaken, my endlessly gossiping senile washerwoman: All you
trolling and troll-feeding senile assholes and bigmouths keep getting
exposed by me for what you are! And I will keep doing so UNTIL YOU CROAK
(which shouldn\'t last too long with some of you really pathetic and abnormal
octogenarians)! LOL

--
Yet more of the so very interesting senile blather by lowbrowwoman:
\"My family loaded me into a \'51 Chevy and drove from NY to Seattle and
back in \'52. I\'m alive. The Chevy had a painted steel dashboard with two
little hand prints worn down to the primer because I liked to stand up
and lean on it to see where we were going.\"
MID: <j2kuc1F3ejsU1@mid.individual.net>

 

[Rod Speed]

rbowman <bowman@montana.com> wrote

Rod Speed wrote

Because then that pathetic wretch would have nothing to post about.

I believe Peeler has set a record for never having posted anything with
redeeming social value. Most trolls at least throw out something that
will
elicit a reply other than FOAD.

True. Weird.