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telephone receiver wanted for audio recording

  • Thread starter anthony altomare
  • Start date
A

anthony altomare

Jan 1, 1970
0
I have been wondering how to wire a telephone receiver's microphone for
use with a sound board. I do some audio recording with friends and
have wanted to convert a telephone for this purpose for sometime now,
but just recently had the gumption to do the research. While scowering
the net for possibly a how-to or some information, i've only found
people making or selling wire-taps for recording both sides of a
conversation. I also found information on the microphone; telephones
use a crystal microphone. Will I be able to just slap an xlr end on
that bad boy and record away or will i need to put an amp on it? so
many questions! any thoughts?
 
P

Phil Allison

Jan 1, 1970
0
"anthony altomare"
I have been wondering how to wire a telephone receiver's microphone for
use with a sound board. I do some audio recording with friends and
have wanted to convert a telephone for this purpose for sometime now,
but just recently had the gumption to do the research. While scowering
the net for possibly a how-to or some information, i've only found
people making or selling wire-taps for recording both sides of a
conversation. I also found information on the microphone; telephones
use a crystal microphone.


** Completely false.

Telephones use a variety of mic capsules - but never "crystal".

Will I be able to just slap an xlr end on
that bad boy and record away or will i need to put an amp on it? so
many questions! any thoughts?


** Depends on the particular phone but in most cases the answer is no.

Telephones are " phantom powered " - like condenser mics are - but not
the same way.

Find someone technical to modify a phone handset and pick one that has a
dynamic capsule.



........ Phil
 
A

aaaltomare

Jan 1, 1970
0
I have a fair amount of technical knowledge (going back and reading my
previous post it may not seem too aparent). I'm just looking for
information that will point me in the right directions. knowing that
telephones run on phantom power is a good start.

I also started thinking about the telephone sets used on old hotel
switchboards. They were just a handset with a quarter inch handset
coming out of it. would those work the same way i would need to modify
a regular phone handset?
 
D

Don Bowey

Jan 1, 1970
0
I have a fair amount of technical knowledge (going back and reading my
previous post it may not seem too aparent). I'm just looking for
information that will point me in the right directions. knowing that
telephones run on phantom power is a good start.


Phones are not powered by a phantom circuit.

In a phone circuit, normally a negative polarity is applied to the Ring wire
and the current flows through the telephone to the Tip wire, to which the
positive polarity of the power supply is connected. In a phantom circuit,
current flows the same direction in both wires.

If you are just trying to use a carbon microphone and "have a fair amount of
technical knowledge," wire the microphone in series with a battery (6V will
do), and a resistor (200 Ohms or so). Take the signal from across the
microphone, or the resistor, via a blocking capacitor. There are more
elaborate methods which are more efficient, but this will give you a good
start.

Carbon microphones tend to be noisy, and also the carbon granules tend to
pack, reducing the conversion from sound pressure to electrical signals. A
sharp rap against something solid helps improve the latter condition.

Don
 
P

Phil Allison

Jan 1, 1970
0
"Don Bowey"
Phones are not powered by a phantom circuit.


** Of course they are - you dimwit.

In a phone circuit, normally a negative polarity is applied to the Ring
wire
and the current flows through the telephone to the Tip wire, to which the
positive polarity of the power supply is connected. In a phantom circuit,
current flows the same direction in both wires.


** Phantom powering refers to any circuit where the power to operate the
device is fed along the same wires used for signals to or from the device.

Condenser mics used a 3 wire, balanced circuit with the DC phantom delivered
in common mode.

A mast head RF amplifier uses the coaxial feeder cable to supply it with AC
or DC power from a remote supply.


If you are just trying to use a carbon microphone and "have a fair amount
of
technical knowledge," wire the microphone in series with a battery (6V
will
do), and a resistor (200 Ohms or so). Take the signal from across the
microphone, or the resistor, via a blocking capacitor. There are more
elaborate methods which are more efficient, but this will give you a good
start.


** Better not overtax the OP - he is still trying to figure out what
crystal mic is.



............ Phil
 
D

Don Bowey

Jan 1, 1970
0
"Don Bowey"


** Of course they are - you dimwit.




** Phantom powering refers to any circuit where the power to operate the
device is fed along the same wires used for signals to or from the device.
Condenser mics used a 3 wire, balanced circuit with the DC phantom delivered
in common mode.

A mast head RF amplifier uses the coaxial feeder cable to supply it with AC
or DC power from a remote supply.





** Better not overtax the OP - he is still trying to figure out what
crystal mic is.



........... Phil

I seem to have overtaxed you. Sorry about that....

Don
 
P

Phil Allison

Jan 1, 1970
0
"Don Bowey"
I seem to have overtaxed you. Sorry about that....


** The only thing you are overtaxing is your cock.



......... Phil
 
R

Ross Herbert

Jan 1, 1970
0
I have been wondering how to wire a telephone receiver's microphone for
use with a sound board. I do some audio recording with friends and
have wanted to convert a telephone for this purpose for sometime now,
but just recently had the gumption to do the research. While scowering
the net for possibly a how-to or some information, i've only found
people making or selling wire-taps for recording both sides of a
conversation. I also found information on the microphone; telephones
use a crystal microphone. Will I be able to just slap an xlr end on
that bad boy and record away or will i need to put an amp on it? so
many questions! any thoughts?

This article http://www.siliconchip.com.au/cms/A_105109/article.html
explains what you need to do to interface a standard analog telephone
to your sound card. You simply require a transmitter power supply (9V
battery) which is isolated from the sound card, (hence the
transformer).
 
R

Ross Herbert

Jan 1, 1970
0
This article http://www.siliconchip.com.au/cms/A_105109/article.html
explains what you need to do to interface a standard analog telephone
to your sound card. You simply require a transmitter power supply (9V
battery) which is isolated from the sound card, (hence the
transformer).

I have noticed when accessing the link via my post you don't see the
full Silicon Chip article, unless you are prepared to pay to see the
rest of it, that is. If you type 'voip phone adaptor silicon chip'
into Google you will get the full article for free. At least, it does
for me.
 
D

Don Bowey

Jan 1, 1970
0
"Don Bowey"



** The only thing you are overtaxing is your cock.



........ Phil


Do yourself a favor, and read more on the subject.

Just so I can have a good laugh, please give me the best reference you can
find to support your view that telephones are powered by a phantom circuit.
 
P

Phil Allison

Jan 1, 1970
0
"Don Bowey"
Do yourself a favor, and read more on the subject.


** Try reading what was posted already:


" Phantom powering refers to any circuit where the power to operate the
device is fed along the same wires used for signals to or from the device.

Condenser mics used a 3 wire, balanced circuit with the DC phantom delivered
in common mode.

A mast head RF amplifier uses the coaxial feeder cable to supply it with AC
or DC power from a remote supply. "


Just so I can have a good laugh,


** Do you laugh like a hyena or a jackass ?


please give me the best reference you can
find to support your view that telephones are powered by a phantom
circuit.


** Does DC current pass down the signal wires to power the phone ?




.......... Phil
 
R

Ross Herbert

Jan 1, 1970
0
"Don Bowey"


** Of course they are - you dimwit.




** Phantom powering refers to any circuit where the power to operate the
device is fed along the same wires used for signals to or from the device.

Condenser mics used a 3 wire, balanced circuit with the DC phantom delivered
in common mode.

A mast head RF amplifier uses the coaxial feeder cable to supply it with AC
or DC power from a remote supply.

Strictly speaking Phil, a POTS instrument is not phantom powered,
although I can see why it would fit that description under your broad
definition.

If we go back to the earliest central battery telephone instruments
you will recall that they used a carbon granule microphone. The idea
is that the DC line current flows through the microphone which in turn
varies its resistance proportionate to the sound pressure waves on the
diaphragm thereby varying the line current. Thus, the microphone
simply modulates the line current which is then passed through a
transformer in the exchange line interface circuit to derive the AC
speech signal for transmission over the network.

While modern telephone instruments no longer use a carbon granule
microphone (although telephones employing them will still work today),
the IC in these instruments must duplicate exactly what the old carbon
microphone did, ie. modulate the DC line current. The fact that the IC
derives its minute operating power from the line voltage may qualify a
modern telephone as being phantom powered under your broad definition,
but this fact is secondary only to the operation of the telephone, and
in my opinion doesn't truly fill the bill. Phantom powering devices in
telephony always relied upon the use of centre-tapped signal
transformers such as the venerable 4012A.
 
D

Don Bowey

Jan 1, 1970
0
"Don Bowey"


** Try reading what was posted already:

Your posts are not what I would ever call a "reference."
" Phantom powering refers to any circuit where the power to operate the
device is fed along the same wires used for signals to or from the device.

That is complete nonsense. Provide a reference to support this.
Condenser mics used a 3 wire, balanced circuit with the DC phantom delivered
in common mode.

Yes, when done correctly, that is a phantom circuit.
A mast head RF amplifier uses the coaxial feeder cable to supply it with AC
or DC power from a remote supply. "

You are describing a simplex power arrangement.
** Do you laugh like a hyena or a jackass ?





** Does DC current pass down the signal wires to power the phone ?


Yes, so what? That is not a phantom configuration.
......... Phil
Look, jackass, if you can't find a good reference, just say so. I suspect
that you are the type of person who increasingly raises the volume of his
voice as replacement for a good argument.

You aren't worth the effort to continue this. Post what you will, but I
will not respond to you on this topic.
 
P

Phil Allison

Jan 1, 1970
0
"Don Bowey"


** Piss off - you pathetic troll.




.......... Phil
 
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