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

[Commander Kinsey]

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

[Peeler]

On Sun, 26 Feb 2023 09:45:26 -0000, Birdbrain Macaw (aka "Commander Kinsey",
"James Wilkinson", "Steven Wanker","Bruce Farquar", "Fred Johnson, etc.),
the pathological resident idiot and attention whore of all the uk ngs,
blathered again:

<FLUSH the subnormal sociopathic trolling attention whore's latest
attention-baiting sick bullshit unread again>

--
damdu...@yahoo.co.uk about Birdbrain Macaw's (now "Commander Kinsey" LOL)
trolling:
"He is a well known attention seeking troll and every reply you
make feeds him.
Starts many threads most of which die quick as on the UK groups anyone
with sense Kill filed him ages ago which is why he now cross posts to
the US groups for a new audience.
This thread was unusual in that it derived and continued without him
to a large extent and his silly questioning is an attempt to get
noticed again."
MID: <be195d5jh0hktj054...@4ax.com>

--
ItsJoanNotJoann addressing Birdbrain Macaw's (now "Commander Kinsey" LOL):
"You're an annoying troll and I'm done with you and your
stupidity."
MID: <e39a6a7f-9677-4e78...@googlegroups.com>

--
AndyW addressing Birdbrain:
"Troll or idiot?...
You have been presented with a viewpoint with information, reasoning,
historical cases, citations and references to back it up and wilfully
ignore all going back to your idea which has no supporting information."
MID: <KaToA.263621$g93.2...@fx10.am4>

--
Phil Lee adressing Birdbrain Macaw:
"You are too stupid to be wasting oxygen."
MID: <uv2u4clurscpat3g2...@4ax.com>

--
Tony944 addressing Birdbrain Macaw:
"I seen and heard many people but you are on top of list being first class
ass hole jerk. ...You fit under unconditional Idiot and should be put in
mental institution.
MID: <VLCdnYC5HK1Z4S3F...@giganews.com>

--
Pelican to Birdbrain Macaw:
"Ok. I'm persuaded . You are an idiot."
MID: <obru31$nao$3...@dont-email.me>

--
DerbyDad03 addressing Birdbrain Macaw (now "Commander Kinsey" LOL):
"Frigging Idiot. Get the hell out of my thread."
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--
Kerr Mudd-John about Birdbrain Macaw (now "Commander Kinsey LOL):
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MID: <op.yy3c0...@dell3100.workgroup>

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Mr Pounder Esquire about Birdbrain Macaw (now "Commander Kinsey" LOL):
"the piss poor delivery boy with no hot running water, 11 cats and
several parrots living in his hovel."
MID: <odqtgc$iug$1...@dont-email.me>

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Rob Morley about Birdbrain:
"He's a perennial idiot"
MID: <20170519215057.56a1f1d4@Mars>

--
JoeyDee to Birdbrain
"I apologize for thinking you were a jerk. You're just someone with an IQ
lower than your age, and I accept that as a reason for your comments."
MID: <0001HW.1EE2D20300...@news.eternal-september.org>

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negative it may be."
MID: <rOmdndd_O7u8iK7E...@brightview.co.uk>

--
thekma...@gmail.com asking Birdbrain:
"What, were you dropped on your head as a child?"
MID: <58ddfad5-d9a5-4031...@googlegroups.com>

--
Christie addressing endlessly driveling Birdbrain Macaw (now "Commander
Kinsey" LOL):
"What are you resurrecting that old post of mine for? It's from last
month some time. You're like a dog who's just dug up an old bone they
hid in the garden until they were ready to have another go at it."
MID: <59d8b0db...@news.eternal-september.org>

--
Mr Pounder's fitting description of Birdbrain Macaw:
"You are a well known fool, a tosser, a pillock, a stupid unemployable
sponging failure who will always live alone and will die alone. You will not
be missed."
MID: <orree6$on2$1...@dont-email.me>

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Only useful thing you've done in your pathetic existence."
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cl...@snyder.on.ca about Birdbrain (now "Commander Kinsey" LOL):
""not the sharpest knife in the drawer"'s parents sure made a serious
mistake having him born alive -- A total waste of oxygen, food, space,
and bandwidth."
MID: <s5e9uclqpnabteheh...@4ax.com>

--
Mr Pounder exposing sociopathic Birdbrain:
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running water with loads of stinking cats and a few parrots."
MID: <os5m1i$8m1$1...@dont-email.me>

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francis about Birdbrain (now "Commander Kinsey" LOL):
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MID: <cf06cdd9-8bb8-469c...@googlegroups.com>

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explain the concept of "invincible ignorance"."
MID: <otofc8$tbg$2...@dont-email.me>

--
Lewis about nym-shifting Birdbrain:
"Typical narcissist troll, thinks his shit is so grand he has the right to
try to force it on everyone
MID: <slrnq16c27....@jaka.local>

[Brian Gaff]

No.
At least if you are really meaning what you said here.
I'm assuming this is some kind of mains to low voltage psu.
Surely, putting the rectifier diodes is going to be on the secondary in any
case. Depending on what you want, it can be done several ways. If the
transformer has two ends to the secondary, ie no centre tap, then you need a
bridge rectifier to allow both halves of the ac waveform to be rectified.
If it has a centre tap then you have one rectifier from the ends, ie one
for each and the centre tap as 0V
Or you could use two bridges, isolating the centre tap and get two
supplies.
Lastly, the least efficient way is one half wave rectifier across the
secondary, but then you are only really using one of the cycles of the mains
in effect.
Brian

--

--:
This newsgroup posting comes to you directly from...
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Blind user, so no pictures please
Note this Signature is meaningless.!
"Commander Kinsey" <C...@nospam.com> wrote in message
news:op.10yv1...@ryzen.home...

[Peeler]

On Sun, 26 Feb 2023 14:49:02 -0000, Brainless & Daft, the TV-watching and
pity-baiting senile "blind" mole, blathered again:

> No.

Yes, you ARE a disgusting pity-baiting troll-feeding senile PIG, Brainless &
Daft!

[Fredxx]

On 26/02/2023 09:45, 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?

No.

What IQ did you say you had? I think whoever told you was lying.

You need to expand on what you're trying to achieve.

[John Larkin]

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.

[The Natural Philosopher]

LOL!


--
Climate is what you expect but weather is what you get.
Mark Twain

[Clare Snyder]

They just forgot the negative sign - - - Somewhere about -78 aught
to be pretty close - - -

[John Larkin]

On Sun, 26 Feb 2023 23:13:23 +0000, The Natural Philosopher
<t...@invalid.invalid> wrote:

>On 26/02/2023 16:13, John Larkin 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.
>>
>LOL!

It was funny in more than one sense.

As long as one is adding diodes, may as well build a doubler on the
output side. Two topologies suggest themselves.

A center-tapped secondary could be useful too. All sorts of
possibilities.

I think I just invented the non-integer-ratio voltage multiplier.

[Max Demian]

On 26/02/2023 09:45, 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?

No, the transformer will turn it back into AC. It responds to /changes/
of current and a half wave will go up and then down resulting in +ve and
-ve from the secondary.

--
Max Demian

[Peeler]

On Mon, 27 Feb 2023 11:36:55 +0000, Max Dumbian, the REAL dumb, notorious,
troll-feeding senile idiot, blathered again:

> No, the transformer will turn it back into AC. It responds to /changes/
> of current and a half wave will go up and then down resulting in +ve and
> -ve from the secondary.

Of course, senile Max Dumb will ALWAYS respond to the sociopathic retard's
most retarded "questions". <BG>

--
Max Dumb having another senile moment:
"It's the consistency of the shit that counts. Sometimes I don't need to
wipe, but I have to do so to tell. Also humans have buttocks to get
smeared due to our bipedalism."
Message-ID: <6vydnWiYDoV1VUrD...@brightview.co.uk>

[Fredxx]

Yer-but, the issue is over the transformer being subject to a DC voltage
which in the case of the OP will be:
230V x sqrt(2) x pi / 2
being developed across the transformer. That will produce a net DC
current in the transformer and make some heat for which the transformer
is not designed.

But you're right the secondary, before its imminent failure, will
produce an AC waveform though likely to be a very distorted sine wave.

[Smolley]

At half the frequency..

[The Natural Philosopher]

On 27/02/2023 11:36, Max Demian wrote:

The transformer will saturate and burn out

--
To ban Christmas, simply give turkeys the vote.

[Fredxx]

The waveform across the transformer is still 50Hz.

I presume the confusion is over full vs half-wave rectification
regarding ripple frequency, 50 vs 100Hz (60 vs 120Hz)

[Fredxx]

On 27/02/2023 15:38, The Natural Philosopher wrote:
> On 27/02/2023 11:36, Max Demian wrote:
>> On 26/02/2023 09:45, 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?
>>
>> No, the transformer will turn it back into AC. It responds to
>> /changes/ of current and a half wave will go up and then down
>> resulting in +ve and -ve from the secondary.
>>
> The transformer will saturate and burn out

It's not a guarantee.

Small transformers are very lossy and have a high resistance and may
survive the impose DC voltage. Larger transformer with lower winding
resistance may not. We also don't know the spec of the transformer the
OP had in mind and the applied voltage.

[The Natural Philosopher]

On 27/02/2023 15:29, Smolley wrote:

No, at the same frequency

--
For in reason, all government without the consent of the governed is the
very definition of slavery.

Jonathan Swift

[Clare Snyder]

I find it REALLY hard to believe anyone can be as clueless as Kinsey
and still manage to breathe on his own - - - Not just this thread -
but EVERY BLINKIN' ONE!!!!

[Clare Snyder]

If he used a transformer with 240 volt primary on a 120 volt supply
the transformer MIGHT survive - particularly if it was a 50hz
transformer on 60Hz but the DC bias would be a REAL killer. Now, if he
put a HUGE capacitor (I think the Limeys still call then condensors)
in series with the primary to block the DC the transformer would
survive - that's how audio output transformers on tube radios survived
having the DC plate voltage on the output - but he'd still be getting
a crappy AC output from the secondary..

I'm still ALMOST convinced Kinsey is a "clever troll" because nobody
in real life could be that consistently stupid

[trader_4]

On Sunday, February 26, 2023 at 4:45:33 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?

No, but you can put it at the power company generator.

[Peeler]

On Tue, 28 Feb 2023 05:49:23 -0800 (PST), tardo_4, the notorious,
troll-feeding, senile idiot, blathered again:

> No, but you can put it at the power company generator.

He certainly can bait all you senile assholes with the dumbest baits he can
think up. LOL

[farter]

On Tue, 28 Feb 2023 17:20:25 +1100, Clare Snyder <cl...@snyder.on.ca>
wrote:

> On Mon, 27 Feb 2023 17:11:24 +0000, Fredxx <fre...@spam.uk> wrote:
>
>> On 27/02/2023 15:38, The Natural Philosopher wrote:
>>> On 27/02/2023 11:36, Max Demian wrote:
>>>> On 26/02/2023 09:45, 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?
>>>>
>>>> No, the transformer will turn it back into AC. It responds to
>>>> /changes/ of current and a half wave will go up and then down
>>>> resulting in +ve and -ve from the secondary.
>>>>
>>> The transformer will saturate and burn out
>>
>> It's not a guarantee.
>>
>> Small transformers are very lossy and have a high resistance and may
>> survive the impose DC voltage. Larger transformer with lower winding
>> resistance may not. We also don't know the spec of the transformer the
>> OP had in mind and the applied voltage.
>>
> If he used a transformer with 240 volt primary on a 120 volt supply
> the transformer MIGHT survive - particularly if it was a 50hz
> transformer on 60Hz but the DC bias would be a REAL killer. Now, if he
> put a HUGE capacitor (I think the Limeys still call then condensors)

Mostly they don't anymore.

> in series with the primary to block the DC the transformer would
> survive - that's how audio output transformers on tube radios survived
> having the DC plate voltage on the output - but he'd still be getting
> a crappy AC output from the secondary..

> I'm still ALMOST convinced Kinsey is a "clever troll" because nobody
> in real life could be that consistently stupid

Fraid so, he is surprisingly clueless about cars and electronics

[Peeler]

On Wed, 01 Mar 2023 13:53:43 +1100, farter, better known as cantankerous
trolling senile geezer Rodent Speed, wrote:

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

--
dennis@home to retarded trolling senile Rodent:
"sod off rod you don't have a clue about anything."
Message-ID: <uV9lE.196195$cx5....@fx46.iad>

[Commander Kinsey]

I thought current always flowed the same way in primary and secondary.... You know, phases and all that.

[John Larkin]

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.

[Peeler]

On Fri, 03 Mar 2023 19:04:07 -0800, John Larkin, another obviously brain
dead, troll-feeding senile asshole, blathered:

>>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.

The reason why the trolling attention whore will keep asking ever more
retarded "questions" is because you troll-feeding senile assholes will keep
answering them.

[Max Demian]

You clearly shouldn't have anything to do with transformers and diodes.

--
Max Demian

[The Natural Philosopher]

+1

--
"Socialist governments traditionally do make a financial mess. They
always run out of other people's money. It's quite a characteristic of them"

Margaret Thatcher

[Commander Kinsey]

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.


On Sun, 26 Feb 2023 14:49:02 -0000, Brian Gaff <brian...@gmail.com> wrote:

> No.
> At least if you are really meaning what you said here.
> I'm assuming this is some kind of mains to low voltage psu.
> Surely, putting the rectifier diodes is going to be on the secondary in any
> case. Depending on what you want, it can be done several ways. If the
> transformer has two ends to the secondary, ie no centre tap, then you need a
> bridge rectifier to allow both halves of the ac waveform to be rectified.
> If it has a centre tap then you have one rectifier from the ends, ie one
> for each and the centre tap as 0V
> Or you could use two bridges, isolating the centre tap and get two
> supplies.
> Lastly, the least efficient way is one half wave rectifier across the
> secondary, but then you are only really using one of the cycles of the mains
> in effect.
> Brian

[John Larkin]

On Sat, 4 Mar 2023 08:59:24 +0100, Peeler <trol...@valid.invalid>
wrote:

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.

[John Larkin]

On Sat, 4 Mar 2023 12:16:59 +0000, Max Demian <max_d...@bigfoot.com>
wrote:

Or should learn more. Spice is a good tool for things like this. As
Mike E says, the main function of LT Spice is to train your instincts.

[Max Demian]

On 04/03/2023 16:05, Commander Kinsey 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.

The penny drops.

--
Max Demian

[Peeler]

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!