Homebrew Transformer

[YD]

"Don Taylor"



** Because it is VERY STUPID and VERY DANGEROUS !!!

Done wrong, it can be.

The OP wants a transformer to use on the AC Supply.

He didn't say, but quite likely.

THAT means DANGEROUSLY high energy and FATAL electrocution risks are
involved.

Done wrong, it can be. Done with care, at most he'll get to know what
overheated magnet wire smells like.

YOU have no comprehension of these matters, at all.

I think he has.

To the OP: The idea of winding a toroid out of steel wire isn't half
bad. Just see to it that the bundle is at 2 cm across and as tight as
possible. I don't think there's a real need for fusing the ends
together. I'd suggest some 1000 to 1200 turns of fine gauge wire for
the primary. Connect it in series with a fuse of at most one ampere.
If you want/need to touch any part of it, first check it out with one
of those neon light pen thingies. Wear rubber soles and touch it with
your right hand only.

- YD.

 

[YD]

On 19 Jun 2006 14:55:53 GMT,

I tried this formula with some approximations:

Np = Vrms * sqr2 * 10^8 / (2*Pi*f*Ae*Bm)

Vrms = 230
sqr2 = 1.41 ..?
f = 50
Ae = 1 cm^2
Bm = 10000 Gauss (Get a feeling this value is wrong)

Np = 230 * 1.41 * 10^8 / (2* 3.14* 50* 1* 10000) = 10328 turns

Correct?

44 turns/volts seems a lot..

1 cm^2 seems awfully small. Double the sides to 4 cm^2 and you'll get
about 11 turns/V. Not too bad.

- YD.

 

[[email protected]]

There is NO SUCH RULE that a primary should have 6-8 turns per volt. The

1 cm^2 seems awfully small. Double the sides to 4 cm^2 and you'll get
about 11 turns/V. Not too bad.

What if the input voltage is a dc pulsed voltage ..? (mosfet+tr)

Did this for 48V @ 175 kHz .5 cm^2:
(48*10**8)/(2*3.14*175000*.5*10000) = .874 turns

(48*10**8)/(2*pi*175000*(pi*.1*.25)*10000) = 5.56 turns
(piece of steelthread would do as core?

What gauss values could one expect from easily available materials like
nails, steelthread etc..? ,cores from used electronics?
Would be useful to test setups.

 

[Don Taylor]

....
To the OP: The idea of winding a toroid out of steel wire isn't half
bad. Just see to it that the bundle is at 2 cm across and as tight as
possible. I don't think there's a real need for fusing the ends
together.

My reasoning for suggesting he fuse the ends was that he was going to
have a fair amount of winding to be done and I expected that to be
considerably more annoying if he had the springy ends of that iron
wire bouncing around on him. That wasn't going to be enough to give
him a really rigid core to work with but it was a start.

 

[YD]

On 20 Jun 2006 16:19:33 GMT,

What if the input voltage is a dc pulsed voltage ..? (mosfet+tr)

Did this for 48V @ 175 kHz .5 cm^2:
(48*10**8)/(2*3.14*175000*.5*10000) = .874 turns

(48*10**8)/(2*pi*175000*(pi*.1*.25)*10000) = 5.56 turns
(piece of steelthread would do as core?

That's cheating, changing conditions.

What gauss values could one expect from easily available materials like
nails, steelthread etc..? ,cores from used electronics?
Would be useful to test setups.

ISTR eddy currents get real bad at those frequencies.

- YD.

 

[Phil Allison]

"YD" <[email protected]>

** Late comer & totally asinine FUCKWIT !!

He didn't say, but quite likely.

** He did say - you illiterate ASS !!

Done wrong, it can be.

** The risks are ALWAYS there - you illiterate fucking ASS.

I think he has.

** Shame how YO are completely brain dead.

To the OP:

** BEWARE OF THIS DAMN IDIOT !!!


OR HE WILL KILL SOME INNOCENT PERSON


Probably YOU.




....... Phil

 

[Phil Allison]

"Don Taylor"



** BEWARE OF THIS DAMN IDIOT !!!


OR HE WILL KILL SOME INNOCENT PERSON


Maybe YOU.




........ Phil

 

[Phil Allison]

"YD" <[email protected]>



** PISS OFF - fucking IDIOT.


BEWARE OF THIS DAMN IDIOT !!!


OR HE WILL KILL SOME INNOCENT PERSON






......... Phil

 

[Pooh Bear]

I think he has.

To the OP: The idea of winding a toroid out of steel wire isn't half
bad. Just see to it that the bundle is at 2 cm across and as tight as
possible. I don't think there's a real need for fusing the ends
together. I'd suggest some 1000 to 1200 turns of fine gauge wire for
the primary. Connect it in series with a fuse of at most one ampere.
If you want/need to touch any part of it, first check it out with one
of those neon light pen thingies. Wear rubber soles and touch it with
your right hand only.

I look forward to news of the liability suit !

Graham

 

[[email protected]]

"YD" <[email protected]>
** PISS OFF - fucking IDIOT.
BEWARE OF THIS DAMN IDIOT !!!
OR HE WILL KILL SOME INNOCENT PERSON
........ Phil

IF you bothered to READ you would noticed the "prefer to buy".

 

[Don Bruder]

IF you bothered to READ you would noticed the "prefer to buy".

If you'd bothered to notice, Phil is our resident "OH MY GOD! EVEN
THINKING THE WORD "ELECTRICITY" IF YOU DON'T HAVE A PhD IN ELECTRONICS
WILL KILL YOU!!!" Chicken-little type.

And as a bonus, he doubles as a 'net-stalker, group whipping boy, and
all-around kook.

Your best bet is to killfile him.

 

[[email protected]]

If you'd bothered to notice, Phil is our resident "OH MY GOD! EVEN

THINKING THE WORD "ELECTRICITY" IF YOU DON'T HAVE A PhD IN ELECTRONICS
WILL KILL YOU!!!" Chicken-little type.

And as a bonus, he doubles as a 'net-stalker, group whipping boy, and
all-around kook.

Your best bet is to killfile him.

Point taken, althought I suspected it

ALL YOUR ELECTRIC THOUGHTS WILL KILL YOU

 

[Phil Allison]

<[email protected]>


** This congenital ASS is completely demented.





...... Phil

 

[Phil Allison]

"Don Brain DEAD Bruder"


** PISS OFF - fucking IDIOT.


BEWARE OF THIS DAMN IDIOT !!!


OR HE WILL KILL SOME INNOCENT PERSON






......... Phil

 

[Phil Allison]

<[email protected]>



** PISS OFF - fucking IDIOT.


BEWARE OF THIS DAMN IDIOT !!!


OR HE WILL KILL SOME INNOCENT PERSON






......... Phil

 

[YD]

My reasoning for suggesting he fuse the ends was that he was going to
have a fair amount of winding to be done and I expected that to be
considerably more annoying if he had the springy ends of that iron
wire bouncing around on him. That wasn't going to be enough to give
him a really rigid core to work with but it was a start.

Ok, I figured you were worried about closing the field lines. Soft
iron can be bent to reasonably hold shape, and anyway it will need to
be wrapped in a layer or two of duct tape before winding the copper.

Wouldn't closing the ends electrically make it behave as a singular
turn, albeit a very long one?

- YD.

 

[YD]

"YD" <[email protected]>

** Late comer & totally asinine FUCKWIT !!





** He did say

So maybe I missed it, so what?

** The risks are ALWAYS there

Manageable risks, he's being told how to go about it. Anyway, it's not
my ass getting fried if he does something wrong. Let him do the
experiments, how else is he going to learn the smell of magic smoke?

- YD.

 

[Phil Allison]

"YD"


** BEWARE OF THIS DAMN IDIOT !!!


OR HE WILL KILL SOME INNOCENT PERSON


Maybe YOU.




........ Phil

 

[Phil Allison]

"YD" = Yobbo & Dickhead



** BEWARE OF THIS DAMN IDIOT !!!


OR HE WILL KILL SOME INNOCENT PERSON


Maybe YOU.





........ Phil

 

[YD]

I look forward to news of the liability suit !

Not much risk of that where I am. Around here we still believe in
personal responsibility. He's been told about the dangers and how to
get around them. That's the end of any liability AFAIAC.

Let him smell the magic smoke and get a taste for it. With all the
screeching going on how is anyone supposed to learn anything at all?

Did someone tell him directly to do something foolish? Is he supposed
to not even get out of bed because life in an upright position holds
some inherent dangers? Is any kind of experiment that may go fiss or
bang verboten? If I dig a hole and being slightly tipsy, step in it
breaking my foot, can I sue the shovel maker?

I have a book on chemistry for boys, printed in the 40s, 1st edition
was sometime in the twenties. By today's standards it would not only
be banned, but burned at the stake. All kinds of fun stuff, fireworks,
pulsating mercury blobs, glass etching and so on. Too bad I lost the
companion book, recipes on purifying sulphuric acid and other fun
stuff.

- YD.