Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Thanks,
Chris

"Chris Breitner" wrote in message
m
Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have a
problem, and then stop worrying.

"Arny Krueger" wrote in message
...
"Chris Breitner" wrote in message
m
Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he could
read a near short and still not have to worry ....

"Richard Freeman" ..
"Arny Krueger"
"Chris Breitner"

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have
a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he
could
read a near short and still not have to worry ....




** You better **re-read** what Arny posted - ie test from pins " 2 and
3 to pin 1 " !!!!!!!





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

Phil Allison wrote:

"Richard Freeman" ..
"Arny Krueger"
"Chris Breitner"

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have
a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he
could
read a near short and still not have to worry ....


** You better **re-read** what Arny posted - ie test from pins " 2 and
3 to pin 1 " !!!!!!!

Never heard of a centre-tapped transformer as often used in what would now be
vintage gear ? Nice DC R connecting all the pins.

Had a real problem once ( thankfully a long time ago ) when given some gear to
set up for a 'society event' with CT balanced outputs that had to be connected
to unbalanced inputs. I'll leave you to guess which way the cables were wired.

Thankfully I was able to troubleshoot it on the spot. The hired DJ ( a well
known radio celebrity ) had kittens quietly while I fixed it.

Needless to say, I wasn't best pleased. Thank goodness these days for floating
balanced outputs.


Graham

"Pooh Bear" wrote in message
...
Phil Allison wrote:

"Richard Freeman" ..
"Arny Krueger"
"Chris Breitner"

I have a ribbon mic I'd like to gig with, and the PA systems we
use
normally plug into have an all-channels-on/off for the phantom
power.
Our vocalist uses a condenser mic, so she needs it on. If the
phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter
with
limited current, such as a good DVM.. If it is infinity, you don't
have
a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he
could
read a near short and still not have to worry ....


** You better **re-read** what Arny posted - ie test from pins " 2
and
3 to pin 1 " !!!!!!!

Never heard of a centre-tapped transformer as often used in what would now
be
vintage gear ? Nice DC R connecting all the pins.


** Got any idea at all why the ohm meter tests are being suggested at all
?????????????

It would **really ** help if you pulled your fat head out of your bum
prior to posting, Pooh.





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

"Pooh Bear" wrote in message
...
Phil Allison wrote:

"Richard Freeman" ..
"Arny Krueger"
"Chris Breitner"

I have a ribbon mic I'd like to gig with, and the PA systems we
use
normally plug into have an all-channels-on/off for the phantom
power.
Our vocalist uses a condenser mic, so she needs it on. If the
phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter
with
limited current, such as a good DVM.. If it is infinity, you don't
have
a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he
could
read a near short and still not have to worry ....


** You better **re-read** what Arny posted - ie test from pins " 2
and
3 to pin 1 " !!!!!!!

Never heard of a centre-tapped transformer as often used in what would now
be
vintage gear ? Nice DC R connecting all the pins.


** Got any idea at all why the ohm meter tests are being suggested at all
?????????????

It would **really ** help if you pulled your fat head out of your bum
prior to posting, Pooh.





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

"Pooh Bear" wrote in message
...
Phil Allison wrote:

"Richard Freeman" ..
"Arny Krueger"
"Chris Breitner"

I have a ribbon mic I'd like to gig with, and the PA systems we
use
normally plug into have an all-channels-on/off for the phantom
power.
Our vocalist uses a condenser mic, so she needs it on. If the
phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter
with
limited current, such as a good DVM.. If it is infinity, you don't
have
a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he
could
read a near short and still not have to worry ....


** You better **re-read** what Arny posted - ie test from pins " 2
and
3 to pin 1 " !!!!!!!

Never heard of a centre-tapped transformer as often used in what would now
be
vintage gear ? Nice DC R connecting all the pins.


** Got any idea at all why the ohm meter tests are being suggested at all
?????????????

It would **really ** help if you pulled your fat head out of your bum
prior to posting, Pooh.





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

Phil Allison wrote:

"Richard Freeman" ..
"Arny Krueger"
"Chris Breitner"

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have
a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he
could
read a near short and still not have to worry ....


** You better **re-read** what Arny posted - ie test from pins " 2 and
3 to pin 1 " !!!!!!!

Never heard of a centre-tapped transformer as often used in what would now be
vintage gear ? Nice DC R connecting all the pins.

Had a real problem once ( thankfully a long time ago ) when given some gear to
set up for a 'society event' with CT balanced outputs that had to be connected
to unbalanced inputs. I'll leave you to guess which way the cables were wired.

Thankfully I was able to troubleshoot it on the spot. The hired DJ ( a well
known radio celebrity ) had kittens quietly while I fixed it.

Needless to say, I wasn't best pleased. Thank goodness these days for floating
balanced outputs.


Graham

Phil Allison wrote:

"Richard Freeman" ..
"Arny Krueger"
"Chris Breitner"

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have
a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he
could
read a near short and still not have to worry ....


** You better **re-read** what Arny posted - ie test from pins " 2 and
3 to pin 1 " !!!!!!!

Never heard of a centre-tapped transformer as often used in what would now be
vintage gear ? Nice DC R connecting all the pins.

Had a real problem once ( thankfully a long time ago ) when given some gear to
set up for a 'society event' with CT balanced outputs that had to be connected
to unbalanced inputs. I'll leave you to guess which way the cables were wired.

Thankfully I was able to troubleshoot it on the spot. The hired DJ ( a well
known radio celebrity ) had kittens quietly while I fixed it.

Needless to say, I wasn't best pleased. Thank goodness these days for floating
balanced outputs.


Graham

"Richard Freeman" ..
"Arny Krueger"
"Chris Breitner"

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have
a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he
could
read a near short and still not have to worry ....




** You better **re-read** what Arny posted - ie test from pins " 2 and
3 to pin 1 " !!!!!!!





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

"Richard Freeman" ..
"Arny Krueger"
"Chris Breitner"

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have
a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he
could
read a near short and still not have to worry ....




** You better **re-read** what Arny posted - ie test from pins " 2 and
3 to pin 1 " !!!!!!!





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

"Arny Krueger" wrote in message
...
"Chris Breitner" wrote in message
m
Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he could
read a near short and still not have to worry ....

"Arny Krueger" wrote in message
...
"Chris Breitner" wrote in message
m
Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have a
problem, and then stop worrying.

Of course it could have a Transformer isolated output in which case he could
read a near short and still not have to worry ....

"Chris Breitner" wrote in message
m
Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have a
problem, and then stop worrying.

"Chris Breitner" wrote in message
m
Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Measure the resistance from pin 2 and 3 to pin 1 using an ohm meter with
limited current, such as a good DVM.. If it is infinity, you don't have a
problem, and then stop worrying.

"Chris Breitner" wrote in message
m...
Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Two options :
1:1 Isolation Transformer - The better Transformers usually cost more and it
is not difficult to spend $100 on a decent Transformer ...

Capacitors in Series with the Signal - 47uF is usually adequate but can
depend on the input impedance of your mixing desk - typically 1K or so which
will give you low Frequency rolloff with a -3dB point of 3Hz Of course the
Desks internal Decoupling Caps will be in Series with this so this will
probably raise your -3dB point to 7 Hz or so.

D Pin 2 ---------------||--------------- Pin 2 of the Mic
e +ve
s Pin 3 ---------------||--------------- Pin 3 of the Mic
k Pin 1 ------------------------------ Pin 1 of the Mic

Arent Ribbon Mics a bit delicate to take on the road ???




Regards
Richard Freeman

Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Blocking caps will remove DC, but that won't do anything for the thump
when you power it on. A transformer will remove DC, but again you need
to plug it into the power supply first, then plug the mike into it, because
it doesn't do anything about the thump from an imbalanced phantom supply.
And, unless it's an RCA mike with a center tap that hasn't been lifted,
the power-on-thump from a badly built phantom supply with mismatched
resistors is the only problem.

What is this mike, anyway? If it's an M-500, don't worry about it.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Blocking caps will remove DC, but that won't do anything for the thump
when you power it on. A transformer will remove DC, but again you need
to plug it into the power supply first, then plug the mike into it, because
it doesn't do anything about the thump from an imbalanced phantom supply.
And, unless it's an RCA mike with a center tap that hasn't been lifted,
the power-on-thump from a badly built phantom supply with mismatched
resistors is the only problem.

What is this mike, anyway? If it's an M-500, don't worry about it.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Blocking caps will remove DC, but that won't do anything for the thump
when you power it on. A transformer will remove DC, but again you need
to plug it into the power supply first, then plug the mike into it, because
it doesn't do anything about the thump from an imbalanced phantom supply.
And, unless it's an RCA mike with a center tap that hasn't been lifted,
the power-on-thump from a badly built phantom supply with mismatched
resistors is the only problem.

What is this mike, anyway? If it's an M-500, don't worry about it.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Richard Freeman wrote:

Arent Ribbon Mics a bit delicate to take on the road ???

No, the ribbon mikes I own are plenty rugged. Besides, people bring
their violin on the road, don't they? And their girlfriend? My BK-5's
are less delicate than my girlfriend by a wide margarine.


ulysses

In this place, Justin Ulysses Morse was recorded saying ...

My BK-5's are less delicate than my girlfriend by a wide margarine.


.... and the prize for quote of the week goes to ...


ulysses


LOL!

(BTW - just how wide IS a margarine?)

--

George
Newcastle, England

Problems worthy of attack
Prove their worth, by hitting back [Piet Hein]

George Perfect wrote:

In this place, Justin Ulysses Morse was recorded saying ...

My BK-5's are less delicate than my girlfriend by a wide margarine.

(BTW - just how wide IS a margarine?)

From what I understand, margarine is really fat.

- Logan

George Perfect wrote:

In this place, Justin Ulysses Morse was recorded saying ...

My BK-5's are less delicate than my girlfriend by a wide margarine.

(BTW - just how wide IS a margarine?)

From what I understand, margarine is really fat.

- Logan

George Perfect wrote:

In this place, Justin Ulysses Morse was recorded saying ...

My BK-5's are less delicate than my girlfriend by a wide margarine.

(BTW - just how wide IS a margarine?)

From what I understand, margarine is really fat.

- Logan

In this place, Justin Ulysses Morse was recorded saying ...

My BK-5's are less delicate than my girlfriend by a wide margarine.


.... and the prize for quote of the week goes to ...


ulysses


LOL!

(BTW - just how wide IS a margarine?)

--

George
Newcastle, England

Problems worthy of attack
Prove their worth, by hitting back [Piet Hein]

In this place, Justin Ulysses Morse was recorded saying ...

My BK-5's are less delicate than my girlfriend by a wide margarine.


.... and the prize for quote of the week goes to ...


ulysses


LOL!

(BTW - just how wide IS a margarine?)

--

George
Newcastle, England

Problems worthy of attack
Prove their worth, by hitting back [Piet Hein]

Richard Freeman wrote:

Arent Ribbon Mics a bit delicate to take on the road ???

No, the ribbon mikes I own are plenty rugged. Besides, people bring
their violin on the road, don't they? And their girlfriend? My BK-5's
are less delicate than my girlfriend by a wide margarine.


ulysses

Richard Freeman wrote:

Arent Ribbon Mics a bit delicate to take on the road ???

No, the ribbon mikes I own are plenty rugged. Besides, people bring
their violin on the road, don't they? And their girlfriend? My BK-5's
are less delicate than my girlfriend by a wide margarine.


ulysses

"Chris Breitner" wrote in message
m...
Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Two options :
1:1 Isolation Transformer - The better Transformers usually cost more and it
is not difficult to spend $100 on a decent Transformer ...

Capacitors in Series with the Signal - 47uF is usually adequate but can
depend on the input impedance of your mixing desk - typically 1K or so which
will give you low Frequency rolloff with a -3dB point of 3Hz Of course the
Desks internal Decoupling Caps will be in Series with this so this will
probably raise your -3dB point to 7 Hz or so.

D Pin 2 ---------------||--------------- Pin 2 of the Mic
e +ve
s Pin 3 ---------------||--------------- Pin 3 of the Mic
k Pin 1 ------------------------------ Pin 1 of the Mic

Arent Ribbon Mics a bit delicate to take on the road ???




Regards
Richard Freeman

"Chris Breitner" wrote in message
m...
Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Two options :
1:1 Isolation Transformer - The better Transformers usually cost more and it
is not difficult to spend $100 on a decent Transformer ...

Capacitors in Series with the Signal - 47uF is usually adequate but can
depend on the input impedance of your mixing desk - typically 1K or so which
will give you low Frequency rolloff with a -3dB point of 3Hz Of course the
Desks internal Decoupling Caps will be in Series with this so this will
probably raise your -3dB point to 7 Hz or so.

D Pin 2 ---------------||--------------- Pin 2 of the Mic
e +ve
s Pin 3 ---------------||--------------- Pin 3 of the Mic
k Pin 1 ------------------------------ Pin 1 of the Mic

Arent Ribbon Mics a bit delicate to take on the road ???




Regards
Richard Freeman

Chris Breitner wrote:

Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Thanks,
Chris
If its your board, go into one of the channels and remove the two
phantom resistors from the channel you want to use the ribbon on.
It will just cost you some time (if you know what your doing that is)

Otherwise, a good isolation transformer as some else suggested externally

Bob




-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----

Chris Breitner wrote:

Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Thanks,
Chris
If its your board, go into one of the channels and remove the two
phantom resistors from the channel you want to use the ribbon on.
It will just cost you some time (if you know what your doing that is)

Otherwise, a good isolation transformer as some else suggested externally

Bob




-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----

Chris Breitner wrote:

Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Thanks,
Chris
If its your board, go into one of the channels and remove the two
phantom resistors from the channel you want to use the ribbon on.
It will just cost you some time (if you know what your doing that is)

Otherwise, a good isolation transformer as some else suggested externally

Bob




-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----

Chris Breitner wrote:

Hey Everyone. I can't seem to find the answer and/or product to
satisfy my needs: a phantom power filter/remover.

I have a ribbon mic I'd like to gig with, and the PA systems we use
normally plug into have an all-channels-on/off for the phantom power.
Our vocalist uses a condenser mic, so she needs it on. If the phantom
power hits my ribbon mic, it might permanently damage the ribbon
element.

Does anyone know of a DIY homebrew solution?

Someone will, I hope, correct me if I'm wrong, but couldn't you just
lift the ground and go with a floating ground? The potential is between
pin 1 (the ground) and pin 2 and between pin 1 (the ground) and pin 3.
There is no potential between pins 2 and 3 because there are equal
value resistors between them and the +48V of the phantom power.

I'm assuming, of course, that cutting the ground near the mic will
still provide you with adequate noise shielding, etc.

- Logan

"Logan Shaw"

Someone will, I hope, correct me if I'm wrong, but couldn't you just
lift the ground and go with a floating ground? The potential is between
pin 1 (the ground) and pin 2 and between pin 1 (the ground) and pin 3.
There is no potential between pins 2 and 3 because there are equal
value resistors between them and the +48V of the phantom power.

I'm assuming, of course, that cutting the ground near the mic will
still provide you with adequate noise shielding, etc.



** Why don't you try out your own idea and check your assumption ???






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

"Logan Shaw"

Someone will, I hope, correct me if I'm wrong, but couldn't you just
lift the ground and go with a floating ground? The potential is between
pin 1 (the ground) and pin 2 and between pin 1 (the ground) and pin 3.
There is no potential between pins 2 and 3 because there are equal
value resistors between them and the +48V of the phantom power.

When this is actually the case, there's no problem at all using phantom
power with a ribbon. The reason it can be a problem (aside from mikes
with center ground taps on the transformer secondary) is that sometimes
those resistors are not very equal values. I'm not going to mention any
particular brand of mixers, but suffice it to say that some of the cheaper
ones out there don't match the supply resistors very well. This also badly
degrades common mode rejection as well as making for an issue with dynamic
mikes.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Scott Dorsey wrote:


The reason it can be a problem (aside from mikes
with center ground taps on the transformer secondary) is that sometimes
those resistors are not very equal values.

How does this cause a problem (other than the rejection
issue)? If the same supply is presented to each side, and 1
is open, then current won't flow between 2 and 3 regardless
of the mismatch.


Bob
--

"Things should be described as simply as possible, but no
simpler."

A. Einstein

Bob Cain wrote:
Scott Dorsey wrote:

The reason it can be a problem (aside from mikes
with center ground taps on the transformer secondary) is that sometimes
those resistors are not very equal values.

How does this cause a problem (other than the rejection
issue)? If the same supply is presented to each side, and 1
is open, then current won't flow between 2 and 3 regardless
of the mismatch.

I didn't word that very well at all. If there _are_ center ground taps,
there is a ground path to pin 1, and therefore the imbalance is an issue.

In fact, even with the ground tap, if there are precise enough resistors
and a good enough transformer, it's a non-issue.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Bob Cain wrote:
Scott Dorsey wrote:

The reason it can be a problem (aside from mikes
with center ground taps on the transformer secondary) is that sometimes
those resistors are not very equal values.

How does this cause a problem (other than the rejection
issue)? If the same supply is presented to each side, and 1
is open, then current won't flow between 2 and 3 regardless
of the mismatch.

I didn't word that very well at all. If there _are_ center ground taps,
there is a ground path to pin 1, and therefore the imbalance is an issue.

In fact, even with the ground tap, if there are precise enough resistors
and a good enough transformer, it's a non-issue.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."