Skin Effect in Solid/Stranded/Litzendraht Wire -Guy Macon

Show us one, then, along with the detailed theory of operation.

Otherwise, shut up and go away.

Thanks,
Rich

 

When I was much younger and stupider, a friend and I climbed
one of those hi-line towers, and could actually reach out
and touch some of the wires (luckily, they were insulated!).
I actually felt the 60 Hz electrical field around the wire,
which was about 1" in diameter. I don't know what the
voltage was, but it was very exciting. (no pun intended.)

Cheers!
Rich

 

No that's wrong: neither the lead nor any other shield
would help to reduce the 60Hz magnetic field strength,
which comes from the magnitude of the ac current, and
the separation (and lack of twist) of the cables. As
it happened, we found the strength of the field in our
labs was a bit weaker than from our own poorly-done
electrical-conduit wiring. Which we had already dealt
with in sensitive experiments.

 

No that's wrong: neither the lead nor any other shield
would help to reduce the 60Hz magnetic field strength,
which comes from the magnitude of the ac current, and
the separation (and lack of twist) of the cables. As
it happened, we found the strength of the field in our
labs was a bit weaker than from our own poorly-done
electrical-conduit wiring. Which we had already dealt
with in sensitive experiments.

 

I'm doing wiring this week (a new employee kitchen/lunchroom) so I got
a little RatShack amplifier/speaker box and wired a Renco drum-core
inductor to it, as a mag field probe, to trace wiring. It's really fun
to wave around other things, like monitors and keyboards and such. An
iPod starting up makes very strange sounds.

As I walk around, I get various 60 Hz things with no obvious source.

John

 

**** off, GriseTard. YOU go the **** away.

 

ChairmanOfTheBored posted to
sci.electronics.design:

You could pick on something actually significant, but no you are
attacking irrelevancies. Do go on making a total ass of yourself.

Try another total lie.

It is inseparable from the horizontal deflection circuit.

Both proving yourself wrong and hoisting on yourself your own petard
simultaneously.

What is your disunderstanding? Maxwell's equations work pretty well
if you can learn how to use them like i have.

BTW i do not have a neurosis of self-importance like you seem to.

 

** More accurately and confusingly, what is a "pant", what is a
"scissor", and what is a "plier"?

 

Almost always true, Joseph, but even if it weren't, that does not mean
that the deflection circuit is NOT a flyback circuit. Even the
vertical deflection circuit is a flyback circuit. I did once have a
monitor in which the HT supply was a completely separate unit, but
that's pretty rare. But for sure, the magnetic deflection circuits
are designed as flyback circuits to rapidly reset the magnetics for
the start of the next scan.

Cheers,
Tom

 

Thanks for the input. However, my further research into this,
including conversations with engineers who actually design and install
power transmission systems, makes it clear that the real answer isn't
anywhere near that simple. It's been fun to look into this more
deeply and learn a little more about the infrastructure that delivers
electrical power to us. The answers are out there for anyone
interested enough to look for them.

Cheers,
Tom

 

Of course it's a flyback. A single tube or transistor drives the
horizontal deflection coil and the HV transformer simultaneously. It's
sort of a neat coincidence that the same drive waveform works for
both.

The earliest b&w teevee sets had a separate, 60 Hz transformer-based
anode supply, operating at low kilovolt level. The dual-use flyback
trick made higher voltages affordable.


John

 

The _earliest_ TV sets didn't need HV - they had a light bulb and
a perforated disk.

If there's only one TV, why is it called a "set"?

Why do they wear a _pair_ of panties but only one bra? ;-)
-- Gallagher

Cheers!
Rich

 

Because early TVs often had the CRT proper (and its power supply?) separate
from the tuner?

 

The retarded asswipe called me a liar when I said that I have been
working on HV PS over the last decade.

One of our supplies was a super anode supply made for Hughes Aircraft
that went into a big three CRT projector (beside it, actually) that was
the old standard in aircraft theater systems.

It was a switcher, and it fed a huge three way HV splitter that was
potted in about a pound of high performance RTV encapsulant. One big, low
corona Silicone HV wire in, and three medium diameter high performance
Silicone HV wires out with anode cups on them.

The projector was over three feet long, and about 27" wide and about 8
inches thick. The tubes were almost the entire length of the chassis,
and were like 6" in diameter. That retrace was small and quick...

I wonder if he has enough brains to know why special relativity comes
into play on an anode supply for large CRT tube sizes.

 

No, Johnny. SOME designs are flyback circuit driven. Some are not.

No, Johnny. In a flyback circuit, that is how SOME of them are driven.
There are plenty of other types of anode supplies in use that are NOT
flyback driven.

Special relativity is included in some cases as well. That still doesn't
mean that all anode supplies for all TVs are flyback circuit driven,
idiot.

COM for consumer devices is one thing. Commercial and industrial, as
well as military applications used other, more hardy methods.

I have made NON-flyback driven anode supplies for the steady cam
monitors in use on nearly all of Hollywood's steady cams. NOT a flyback
anode drive. It uses the same high brightness, daylight viewable
Thompson tube used in the F-4 Phantom.

For Hughes Aircraft in flight theater projectors. NOT a flyback anode
drive.

For General Electric medical imaging CRTs. NOT a flyback anode drive.

All are high reliability applications. All are not flybacks.

Consumer flybacks puke if you cough the wrong way when they are on.

 

Because it requires a SET of circuits to make it operate.

The fruit smashing idiot.

 

In TV sets?

Well, they're not in LCDs, or plasma displays, or those TI light
deflector things. But I doubt you can find a CRT-based TV that doesn't
drive the horizontal deflection coil and the flyback transformer from
the same device.

Are there any TVs that have separate drivers?

Please tell us.

And none are TV sets.


John

 

Tooth brush. Though perhaps Dimbulb invented it.

 

We were talking about CRTs. ALL CRTs.

 

YOU said this:

"A TV deflection circuit is NOT a flyback supply, idiot. The flyback
in a TV is in the ANODE supply, you stupid ****."

Remember?

Weasel time, again? Go for it.

John