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

[The Natural Philosopher]

On 04/03/2023 17:42, John Larkin wrote:

On Sat, 04 Mar 2023 16:05:37 -0000, \"Commander Kinsey\"
CK1@nospam.com> wrote:

I was actually talking about a stepup transformer. 120V to 6000V. Yes it\'s American, I got it cheap. To avoid finding a 6000V diode, I thought I could use a 120V diode. From all the answers it appears I was wrong to assume because the current is going one way through the primary it must be going the same way through the secondary. Actually the DC component is lost and the AC is passed, so I just get squint AC.

Trying to make a high voltage DC supply? You can get 1KV 1 amp diodes
for a few cents each. Those can be used in series.

You should generally be careful doing that. If one is leaky it will put
a far higher voltage across the others. In general you need to select
for reverse leakage current OR put high value resistsiors across them to
guarantee a predictable \'leakiness\'


--
The urge to save humanity is almost always a false front for the urge to
rule.
– H. L. Mencken, American journalist, 1880-1956

 

[The Natural Philosopher]

On 04/03/2023 19:44, John Larkin wrote:

Hunching over a screen and mousing all day is bad for the body and
soul.

Tell me about it. Years of doing it as a job have left me with damaged
nerves and a compressed spine.
The surgeon is taking a dremel to the bones sometime this year to
relieve the pressure

--
The urge to save humanity is almost always a false front for the urge to
rule.
– H. L. Mencken, American journalist, 1880-1956

 

[The Natural Philosopher]

On 05/03/2023 11:15, Max Demian 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.

\"That applies to you\" he said. \"Things matter to you. You asked me about
my controlled folly and I told you that everything I do in regard to
myself and my fellow men is folly, because nothing matters.\"

\"My point is, don Juan, that if nothing matters to you, how can you go
on living?\"

He laughed and after a moment\'s pause, in which he seemed to deliberate
whether or not to answer, he got up and went to the back of his house. I
followed him.

\"Wait, wait, don Juan.\" I said. \"I really want to know; you must explain
to me what you mean.\"

\"Perhaps it\'s not possible to explain,\" he said. \"Certain things in your
life matter to you because they\'re important; your acts are certainly
important to you, but for me, not a single thing is important any
longer, neither my acts nor the acts of any of my fellow men. I go on
living, though, because I have my will. Because I have tempered my will
throughout my life until it\'s neat and wholesome and now it doesn\'t
matter to me that nothing matters. My will controls the folly of my life.\"

Carlos Castenada - \"The teachings of Don Juan\".

--
\"The most difficult subjects can be explained to the most slow witted
man if he has not formed any idea of them already; but the simplest
thing cannot be made clear to the most intelligent man if he is firmly
persuaded that he knows already, without a shadow of doubt, what is laid
before him.\"

- Leo Tolstoy

 

[John Larkin]

On Sun, 5 Mar 2023 12:25:13 +0000, The Natural Philosopher
<tnp@invalid.invalid> wrote:

On 04/03/2023 17:42, John Larkin wrote:
On Sat, 04 Mar 2023 16:05:37 -0000, \"Commander Kinsey\"
CK1@nospam.com> wrote:

I was actually talking about a stepup transformer. 120V to 6000V. Yes it\'s American, I got it cheap. To avoid finding a 6000V diode, I thought I could use a 120V diode. From all the answers it appears I was wrong to assume because the current is going one way through the primary it must be going the same way through the secondary. Actually the DC component is lost and the AC is passed, so I just get squint AC.

Trying to make a high voltage DC supply? You can get 1KV 1 amp diodes
for a few cents each. Those can be used in series.

You should generally be careful doing that. If one is leaky it will put
a far higher voltage across the others. In general you need to select
for reverse leakage current OR put high value resistsiors across them to
guarantee a predictable \'leakiness\'

Modern diodes are almost all controlled-avalanche. They zener without
a negative-resistance snap effect, so are safe to run in series; they
self-adjust. Silicon HV diodes are a stack of lower-voltage junctions.

You can Spice a series string of various-voltage zeners and see what
happens.

Two items of folk wisdom \"don\'t put diodes in series\" and \"don\'t put
diodes in parallel\" are mostly wrong.

 

[John Larkin]

On Sat, 04 Mar 2023 23:36:56 -0700, boB <boB@K7IQ.com> wrote:

On Fri, 3 Mar 2023 20:13:46 -0800 (PST), Anthony William Sloman
bill.sloman@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:

Can I put a diode BEFORE a step up transformer so I can use a lower voltage diode for half wave rectification?

Ah. Humor. Thanks for the laugh.

I thought current always flowed the same way in primary and secondary.... You know, phases and all that.
Assume a loaded bifilar transformer, both dots up, and draw the
winding currents.

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.

No 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.

boB

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.

 

[John Larkin]

On Sun, 05 Mar 2023 08:32:46 +1100, \"Rod Speed\"
<rod.speed.aaa@gmail.com> wrote:

On Sun, 05 Mar 2023 06:44:41 +1100, John Larkin
jlarkin@highlandsnipmetechnology.com> wrote:

On Sun, 05 Mar 2023 05:55:29 +1100, \"Rod Speed\"
rod.speed.aaa@gmail.com> wrote:

On Sun, 05 Mar 2023 04:54:53 +1100, John Larkin
jlarkin@highlandsnipmetechnology.com> wrote:

On Sat, 4 Mar 2023 18:09:09 +0100, Peeler <trolltrap@valid.invalid
wrote:

On Sat, 04 Mar 2023 08:26:50 -0800, John Larkin, another obviously
brain
dead, troll-feeding senile asshole, blathered:


The prime function of SED is to discuss electronics design, and
another is to help people who have questions or don\'t understand
everything or who want to play with ideas.

If you stop being mindlessly nasty and think about electronics, and
try to be helpful, you\'ll be better off. But you are trapped in
meanness and can\'t break out.

Sloman is similarly trapped. So says absurd things about the topic,
just to be contradictory.

Just stop feeding the troll (additionally you might also stop being a
typical senile smartass) and everything will be all right!

I\'m all right. You are clearly damaged.

Use your intelligence

That is long gone.

and repair yourself.

Its always been irrepairable.

Yeah, most people, after they get into a nasty loop, can never break
out.

Not just a nasty loop. any loop for most people.

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.

Even so, fresh air and sunshine and exercize will make most anyone
more energetic and feel better and likely improve ability to design.

I\'ve got my BMI from almost 27 to below 24 and it makes a real
difference.

What\'s your BMI?

 

[Rod Speed]

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.

 

[John Larkin]

On Sun, 5 Mar 2023 12:27:03 +0000, The Natural Philosopher
<tnp@invalid.invalid> wrote:

On 04/03/2023 19:44, John Larkin wrote:
Hunching over a screen and mousing all day is bad for the body and
soul.

Tell me about it. Years of doing it as a job have left me with damaged
nerves and a compressed spine.
The surgeon is taking a dremel to the bones sometime this year to
relieve the pressure

I got a bad case of De Quervain\'s Tenosynovitis, which is painful
whether or not you can pronounce it. Human bodies are still
evolutionary kluges with lots of bugs. Joints and tendons are a real
hack.

A gigantic steroid shot seems to have fixed it. Medicine evolves
faster than bodies do.

 

[John Larkin]

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. Not to mention food, skiing, and
electronics.

 

[Peeler]

On Mon, 06 Mar 2023 04:25:27 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

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

--
Bod addressing senile Rodent Speed:
\"Rod, you have a sick twisted mind. I suggest you stop your mindless
and totally irresponsible talk. Your mouth could get you into a lot of
trouble.\"
MID: <gfbb94Fb4a4U1@mid.individual.net>

 

[Peeler]

On Sun, 05 Mar 2023 09:38:42 -0800, John Larkin, another obviously brain
dead, troll-loving senile asshole, blathered:

Women alone make life good. Not to mention food, skiing, and
electronics.

Found yet another PROVEN sociopathic troll to feed, you idiotic
troll-feeding senile SHITHEAD?

 

[Peeler]

On Sun, 05 Mar 2023 09:24:39 -0800, John Larkin, another obviously brain
dead, troll-loving senile asshole, blathered:

I don\'t get depression.

Even so, fresh air and sunshine and exercize will make most anyone
more energetic and feel better and likely improve ability to design.

I\'ve got my BMI from almost 27 to below 24 and it makes a real
difference.

What\'s your BMI?

What\'s this with you and your abnormal feeding of the two dumbest trolls
around, you abnormal troll-feeding senile cretin? LOL

 

[Peeler]

On Sun, 05 Mar 2023 09:32:08 -0800, John Larkin, another obviously brain
dead, troll-loving senile asshole, blathered:

I got a bad case of De Quervain\'s Tenosynovitis, which is painful
whether or not you can pronounce it. Human bodies are still
evolutionary kluges with lots of bugs. Joints and tendons are a real
hack.

A gigantic steroid shot seems to have fixed it. Medicine evolves
faster than bodies do.

Oh, fuck! More useless senile blather in these three newsgroups!

 

[John Larkin]

On Sun, 5 Mar 2023 19:29:48 +0100, Peeler <trolltrap@valid.invalid>
wrote:

On Sun, 05 Mar 2023 09:24:39 -0800, John Larkin, another obviously brain
dead, troll-loving senile asshole, blathered:


I don\'t get depression.

Even so, fresh air and sunshine and exercize will make most anyone
more energetic and feel better and likely improve ability to design.

I\'ve got my BMI from almost 27 to below 24 and it makes a real
difference.

What\'s your BMI?

What\'s this with you and your abnormal feeding of the two dumbest trolls
around, you abnormal troll-feeding senile cretin? LOL

Fatso!

 

[Peeler]

On Sun, 05 Mar 2023 11:02:30 -0800, John Larkin, another obviously brain
dead, troll-loving senile asshole, blathered:

Even so, fresh air and sunshine and exercize will make most anyone
more energetic and feel better and likely improve ability to design.

I\'ve got my BMI from almost 27 to below 24 and it makes a real
difference.

What\'s your BMI?

What\'s this with you and your abnormal feeding of the two dumbest trolls
around, you abnormal troll-feeding senile cretin? LOL

Fatso!

ANSWER the question, senile blabbermouth: What\'s this with you and your
abnormal feeding of the two dumbest PROVEN sociopathic trolls in these
groups, you abnormal troll-feeding senile cretin?

 

[Rod Speed]

On Mon, 06 Mar 2023 04:24:39 +1100, John Larkin
<jlarkin@highlandsnipmetechnology.com> wrote:

On Sun, 05 Mar 2023 08:32:46 +1100, \"Rod Speed\"
rod.speed.aaa@gmail.com> wrote:

On Sun, 05 Mar 2023 06:44:41 +1100, John Larkin
jlarkin@highlandsnipmetechnology.com> wrote:

On Sun, 05 Mar 2023 05:55:29 +1100, \"Rod Speed\"
rod.speed.aaa@gmail.com> wrote:

On Sun, 05 Mar 2023 04:54:53 +1100, John Larkin
jlarkin@highlandsnipmetechnology.com> wrote:

On Sat, 4 Mar 2023 18:09:09 +0100, Peeler <trolltrap@valid.invalid
wrote:

On Sat, 04 Mar 2023 08:26:50 -0800, John Larkin, another obviously
brain
dead, troll-feeding senile asshole, blathered:


The prime function of SED is to discuss electronics design, and
another is to help people who have questions or don\'t understand
everything or who want to play with ideas.

If you stop being mindlessly nasty and think about electronics, and
try to be helpful, you\'ll be better off. But you are trapped in
meanness and can\'t break out.

Sloman is similarly trapped. So says absurd things about the topic,
just to be contradictory.

Just stop feeding the troll (additionally you might also stop being
a
typical senile smartass) and everything will be all right!

I\'m all right. You are clearly damaged.

Use your intelligence

That is long gone.

and repair yourself.

Its always been irrepairable.

Yeah, most people, after they get into a nasty loop, can never break
out.

Not just a nasty loop. any loop for most people.

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.

Even so, fresh air and sunshine and exercize will make most anyone
more energetic and feel better and likely improve ability to design.

Don\'t find that myself.

I\'ve got my BMI from almost 27 to below 24 and it makes a real
difference.

The only difference it makes for me is that its easier to put
the massive great wool and nylon mix boot shoes on in winter.

> What\'s your BMI?

25

 

[rbowman]

On Sun, 05 Mar 2023 08:59:13 -0800, John Larkin wrote:

Two items of folk wisdom \"don\'t put diodes in series\" and \"don\'t put
diodes in parallel\" are mostly wrong.

The first company I worked for made dielectric preheaters for the plastics
industry. The were basically a 7.5 kW oscillator with the material placed
in the RF cavity. There rolled their own high voltage rectifiers and
capacitors. I forget how many diodes were in series with the whole
assembly potted into a brick with two lugs.

They operated in the FM band but the frequency change as the material
heated was minimal unlike the RF heat sealers that were known for their
whoosh sounding interference.

On the factory floor both were rumored to make you sterile or incredibly
fertile, take your pick. In the days before microwave ovens were common
the the workers also figured out the preheaters were handy for warming up
you sandwich.

The same company did make several industrial sized microwave ovens for
restaurants but completely missed the potential of the consumer market.

 

[Rod Speed]

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.

Not to mention food, skiing, and
electronics.

 

[Peeler]

On 5 Mar 2023 19:40:25 GMT, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:


> The first company I worked for

Oh, fuck! It starts again...

<FLUSH rest of the usual verbose senile crap unread again>

--
More of the senile gossip\'s absolutely idiotic senile blather:
\"I stopped for breakfast at a diner in Virginia when the state didn\'t do
DST. I remarked on the time difference and the crusty old waitress said
\'We keep God\'s time in Virginia.\'

I also lived in Ft. Wayne for a while.\"

MID: <t0tjfa$6r5$1@dont-email.me>

 

[Peeler]

On Mon, 06 Mar 2023 06:41:42 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

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

--
Marland answering senile Rodent\'s statement, \"I don\'t leak\":
\"That¢s because so much piss and shite emanates from your gob that there is
nothing left to exit normally, your arsehole has clammed shut through disuse
and the end of prick is only clear because you are such a Wanker.\"
Message-ID: <gm2h57Frj93U1@mid.individual.net>