Getting matching transformer from telephone

[Eeyore]

Off hook is a loop *current* condition.

WOW. I'd never have guessed !

Typically a split winding is used, with a mid-point
capacitor to block DC current.

What a load of Bollocks !

Transformers are neither needed nor used any more.

Graham

 

[Eeyore]

It has worked for roughly 100 years

Is that how long you've been practicing telephony ?

Graham

 

[Eeyore]

You have that backwards. If you use a properly designed
pad with the correct impedance it will maximized common
mode rejection of induced currents.

As far as to how using correctly designed pads are
unsafe, I'll pass on that one and let you explain what
you think you are saying. (Because I just can't imagine
how a proper pad, or even an improper one, is unsafe.)

"Howls of derisive laughter" Bruce:

Graham

 

[Eeyore]

You can say anything you like, but when you make up all
the ridiculous garbage you are posting to this thread
there is little doubt that you haven't got even the
faintest clue how telecommuncations equipment works.

Want to to see the schematics ? I'm sure I still have them here
somewhere.

Graham

 

[Eeyore]

BS. I had previously discussed it in detail.

You are full of BS.

 

[Eeyore]

No, I am your superior, and there is nothing that you can do about it,
amp boy.

Proof positive. How's your DSP btw ? Ultra-low noise analogue circuitry,
interfacing one to the other etc ?

Graham

 

[Eeyore]

45 years ago it certainly was!

Minority use even then.

Try and think WHY.

Graham

 

[tony sayer]

WOW. I'd never have guessed !



What a load of Bollocks !

Transformers are neither needed nor used any more.

Graham

Umm... beg to differ .. they are used for 2 and 4 wire analogue or
analogue over digital voice band private circuits...

And they do sometimes use DC blocks but rarely now as point to point DC
available paths are rather rare unless on the same ends of the serving
exchange.....

 

[Phil Allison]

"Stuart" <[email protected]>

** Another fucking tenth witted autistic pommy ****.

Did it suggest anything other than that in the given description?


It is always grounded, directly or indirectly, otherwise the screen fails
to be effective.

** More pedantic, pommy fuckwit nonsense.

Screening works even if there is no connection to AC supply ground or
actual ground.

So how does phantom power work then?

** Shame a dumb as dog shit pommy **** like YOU has no fucking clue.

Ain't it - eh ??

Why do you think people such as www.Lundahl.se and others are still
manufacturing and selling them, even introducing new designs.

** Go ask them why - fuckhead.

Such fake arguments ( based on a LACK of evidence) have no logical basis.

At a one-off price of around 20-30 quid they must be manufacturing them in
"quantity"

R.S. Components are a hard-headed, very commercially minded
electrical/electronics distributor, who only stock stuff they can shift in
quantity, yet they still list a centre-tapped primary, microphone
transformer

** Such units are sometimes used in * DI boxes* et alia to receive phantom
power - not deliver it.

Most mic trannys have centre taps on the low Z side - nothing more than an
historical relic.

In an article in Electronics World April 1991, Douglas Self of Soundcraft
stated "It is now rare to use input transformers...." It is clear,
therefore, that they were still being used, even if only in specialist
applications. That is a bare 18 years ago.

** Wot fucking asinine reverse logic drivel.

Doug Self is a smug, pompous idiot - at best.

His hands on experience with any area of pro-audio practice or design is
virtually nil.



...... Phil

 

[Eeyore]

Here is the donkey's 'Civilized World'

<http://www.dailymail.co.uk/news/art...999-seven-seconds-alcohol-induced-mayhem.html>

At least we don't kill thousands of our fellow citizens each year with GUNS.

I'd rather have a bloody nose than be dead from a gunshot thanks, you bunch of criminally retarted cunts. At least it's ONE thing
you lead the world at !

http://www.gun-control-network.org/GF01.htm

Graham

 

[Archimedes' Lever]

Ummmm....

A standard UK BT NTTP socket as used for the UK POTS would have a gas
tube arrestor -across- the line. IIRC there is a centre tapped point
which might be earthed, but in most all cases won't be;-(..

So several miles of OHL and just that and an -out of service- resistor
doesn't seem like much effective protection to what nature can
deliver....

You left out the isolation transformer in the phone.

Also, the tube will have a return path, and quell any HV down to
non-arcing voltages.

 

[Archimedes' Lever]

"Archimedes'= CRIMINAL PSYCHOPATH "


** Report this FUCKING SCUMBAG to his ISP

NOW !!!!!!!!!!!!!!!!


Get the STINKING PIG fucked off usenet for ever.





..... Phil

Yes, Phil... the fucking scumbag, stinking pig that you are should
have complaints filed against him.

I agree... Folks... please file complaints about the stupid, group
abusing poster that we all know of as:

The EverVile PhilTard!

 

[Archimedes' Lever]

"Archimedes'= CRIMINAL PSYCHOPATH "


** Report this FUCKING SCUMBAG to his ISP

NOW !!!!!!!!!!!!!!!!


Get the STINKING PIG fucked off usenet for ever.





..... Phil

Hey, Phil, you fucking retard! You have been DOUBLE POSTING all of your
retarded tripe to the group TWICE.

You are about as stupid as a Usenet poster can get, but I assure you
that Roy has you beat.

 

[Phil Allison]

"Archimedes'= CRIMINAL PSYCHOPATH "


** Report this FUCKING SCUMBAG to his ISP

NOW !!!!!!!!!!!!!!!!


Get the STINKING TROLLING PIG

fucked off usenet for ever !!




...... Phil

 

[Archimedes' Lever]

WOW. I'd never have guessed !



What a load of Bollocks !

Transformers are neither needed nor used any more.

Graham

You are probably simply too fucking stupid to recognize the part
package, dumb donkey. They are less than 1 x 1 x 2 cm these days, but I
wouldn't expect a dipshit like you to know that fact.

 

[Eeyore]

We *were* talking about the impedance as presented to to the input of a
mixer or whatever

Were we ?

, i.e., yes, after the internal transformer,

Most dynamics don't even have an internal transformer you twat.

not the impedance of the ribbon itself. The once very widely used Reslo RB/L
series was specified as 30-50 ohm

I know. I have 2.

Did it suggest anything other than that in the given description?
YES.



It is always grounded, directly or indirectly, otherwise the screen fails
to be effective.

Completely UNTRUE. Ever heard of battery operated equipment ?

So how does phantom power work then? You stick a voltage down the signal
leads in parallel and the the return is via what?

Pin 1 is the RETURN path, not the means by which voltage is applied.

If you were even born more than 35 years ago how come you know so little?

And you work in WHICH industry ? Got a CV ?

Why do you think people such as www.Lundahl.se and others are still
manufacturing and selling them, even introducing new designs.

They have a niche market. I have used Lundahl and Sowter myself where galvanic
isolation or outdated design requires the use of a transformer.

At a one-off price of around 20-30 quid they must be manufacturing them in
"quantity"

I can get an entire small 6 channel mixer of surprisingly good quality built in
China for that much.

R.S. Components are a hard-headed, very commercially minded
electrical/electronics distributor, who only stock stuff they can shift in
quantity, yet they still list a centre-tapped primary, microphone
transformer

In an article in Electronics World April 1991, Douglas Self of Soundcraft
stated "It is now rare to use input transformers...." It is clear,
therefore, that they were still being used, even if only in specialist
applications. That is a bare 18 years ago.

No-one was using them in quantity after about 1980.

Doug Self is a Self promoting fathead.

Graham

 

[Archimedes' Lever]

Is that how long you've been practicing telephony ?

Graham

Compared to you, it would be a number ten times greater than that
figure.

Dumb donkey knowledge = 0.1%

Floyd knowledge = 100%

Dumb donkey grasp = even less.

You're not doing so well, dumb donkey.

 

[Archimedes' Lever]

Want to to see the schematics ? I'm sure I still have them here
somewhere.

Graham

And that fact STILL does not negate the fact that you have no grasp of
it.

More proof, donktard! You can actually have a schematic available, and
spew horseshit without even referring to it. You can actually have it,
and have no concept of how to interpret it as well. You're a real
wiener, donktard.

You really are one dumb donkey.

 

[Archimedes' Lever]

You are full of BS.

You should at least read the entire thread before you make stupid
claims, dumb donkey.

That's right... you were too stupid to REFER to the schematic you
claim to have as well.

 

[Archimedes' Lever]

Proof positive. How's your DSP btw ? Ultra-low noise analogue circuitry,
interfacing one to the other etc ?

Graham

I use dual Sharcs. You use NOTHING, because you are all talk...

....and lame ebay auctions for your pathetic gear by folks that do not
want your pathetic gear any more.

How many do you own, pathetic donkey?

Bwuahahahahahahahaha!