Does anyone have a 48 volt phantom power
supply that is not a swicching supply? This
would probably have to be a older supply. I
just need it to power one mike. I am using a
condenser mike with my amateur radio transceiver and
the new switching supplies must beat with something
in the tranceiver to cause a low level tone
in my transmitted audio.Does anyone have an older supply
for sale?


Also, any sugestions for eliminating this problem?
It would be a lot easier to use a switching supply.

Kent Tunks

1. 5 9 volt batteries, 2 resistors and 2 coupling capacitors....

2. a dynamic microphone.... or better yet a carbon one from a WE500

Rgds:
Eric


"Carlos42" wrote in message
om...
Does anyone have a 48 volt phantom power
supply that is not a swicching supply? This
would probably have to be a older supply. I
just need it to power one mike. I am using a
condenser mike with my amateur radio transceiver and
the new switching supplies must beat with something
in the tranceiver to cause a low level tone
in my transmitted audio.Does anyone have an older supply
for sale?


Also, any sugestions for eliminating this problem?
It would be a lot easier to use a switching supply.

Kent Tunks

"Carlos42" wrote in message
om

Does anyone have a 48 volt phantom power
supply that is not a switching supply? This
would probably have to be a older supply.

Audio Technica CP8506 It ain't cheap, it's oversized, but I have one and
I know for sure it has a linear power supply,


I just need it to power one mike. I am using a
condenser mike with my amateur radio transceiver and
the new switching supplies must beat with something
in the transceiver to cause a low level tone
in my transmitted audio.Does anyone have an older supply
for sale?

Seems like a reasonable situation.

"Carlos42" wrote ...
Does anyone have a 48 volt phantom power
supply that is not a swicching supply? This
would probably have to be a older supply. I
just need it to power one mike. I am using a
condenser mike with my amateur radio transceiver and
the new switching supplies must beat with something
in the tranceiver to cause a low level tone
in my transmitted audio.Does anyone have an older supply
for sale?

Does your mic REALLY need a full 48v?
(Many of them require as little as 5-9v)

You could use any old 48v power supply like an
open-frame one (like from DigiKey or MPJA, etc.)

Or you could use a wall-wart (like a 24v one from
AllElectronics for $4.75 with a voltage doubler
(the phantom power current requirement is very low).

Also, any sugestions for eliminating this problem?
It would be a lot easier to use a switching supply.

Or you could put additional filtering on your switch-
mode power supply. Since the current requirement is
so low, a series of R/C sections would make it nice
and quiet while still delivering adequate current.

Condor makes a 48V, 0.5A linear supply. You can order it from Mouser - HB48-0.5-A+

It's definitely overkill, but at $42, it will power a lot of mics.

Carlos42 wrote:
Does anyone have a 48 volt phantom power
supply that is not a swicching supply? This
would probably have to be a older supply. I
just need it to power one mike. I am using a
condenser mike with my amateur radio transceiver and
the new switching supplies must beat with something
in the tranceiver to cause a low level tone
in my transmitted audio.Does anyone have an older supply
for sale?

AKG still makes one, I think.

Also, though, your microphone may have a DC-DC converter which may also
be causing part of the problem.

Also, any sugestions for eliminating this problem?
It would be a lot easier to use a switching supply.

My suggestion is put five 9V batteries in series, get a pair of 6.81K
resistors, and make your own. That way you'll at least be able to make
sure the problem is the supply and not the mike.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

(Carlos42) wrote in message . com...
Does anyone have a 48 volt phantom power
supply that is not a swicching supply? This
would probably have to be a older supply. I
just need it to power one mike. I am using a
condenser mike with my amateur radio transceiver and
the new switching supplies must beat with something
in the tranceiver to cause a low level tone
in my transmitted audio.Does anyone have an older supply
for sale?


Also, any sugestions for eliminating this problem?
It would be a lot easier to use a switching supply.

Kent Tunks

Here is a really nice linear 48VDC supply. It puts out 60ma and is
quite small. $34.95

http://store.yahoo.com/triodeel/pcboardkits.html

Roger

On 15 Mar 2004 16:08:15 -0800, (Carlos42) wrote:

Does anyone have a 48 volt phantom power
supply that is not a swicching supply? This
would probably have to be a older supply. I
just need it to power one mike. I am using a
condenser mike with my amateur radio transceiver and
the new switching supplies must beat with something
in the tranceiver to cause a low level tone
in my transmitted audio.Does anyone have an older supply
for sale?


Also, any sugestions for eliminating this problem?
It would be a lot easier to use a switching supply.

Wouldn't a dynamic mic. do the job? Or is this some breed of hi-fi
amateur radio? :-)

CubaseFAQ www.laurencepayne.co.uk/CubaseFAQ.htm
"Possibly the world's least impressive web site": George Perfect

I did not think about the possibility of a DC-DC converter
being part of this problem.Thanks, Scott, for the tip!
The mike is a Behringer B-1.I have no idea of the electronics
inside.Does anyone else know if it has a DC-DC converter?

My thanks to all who replied, there were many good sugestions
offered and I appreciate all of them.

In the interim, I have ordered a Nady SMPS-1 that the
Nady folks tell me is a linear supply. It is cheap, $35
including shipping. I will let the group know how it
works out.

Kent Tunks


(Scott Dorsey) wrote in message ...
Carlos42 wrote:
Does anyone have a 48 volt phantom power
supply that is not a swicching supply? This
would probably have to be a older supply. I
just need it to power one mike. I am using a
condenser mike with my amateur radio transceiver and
the new switching supplies must beat with something
in the tranceiver to cause a low level tone
in my transmitted audio.Does anyone have an older supply
for sale?

AKG still makes one, I think.

Also, though, your microphone may have a DC-DC converter which may also
be causing part of the problem.

Also, any sugestions for eliminating this problem?
It would be a lot easier to use a switching supply.

My suggestion is put five 9V batteries in series, get a pair of 6.81K
resistors, and make your own. That way you'll at least be able to make
sure the problem is the supply and not the mike.
--scott

Carlos42 wrote:
I did not think about the possibility of a DC-DC converter
being part of this problem.Thanks, Scott, for the tip!
The mike is a Behringer B-1.I have no idea of the electronics
inside.Does anyone else know if it has a DC-DC converter?

It's a Beijing microphone. I don't think any of those have a converter
and they all polarize directly from the 48V line. This is sort of a bad
thing since they have capsules that are copies of ones designed for much
higher voltages and don't perform as well on 48V. It's also a bad thing
in that the microphone really needs 48V, and won't work at all on 24V,
for instance.

In the interim, I have ordered a Nady SMPS-1 that the
Nady folks tell me is a linear supply. It is cheap, $35
including shipping. I will let the group know how it
works out.

SMPS? That sounds kinds of suspicious.... SMPS stands for Switching Mode
Power Supply in other quarters.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

In rec.audio.pro, (Carlos42) wrote:

Does anyone have a 48 volt phantom power
supply that is not a swicching supply? This
would probably have to be a older supply. I
just need it to power one mike. I am using a
condenser mike with my amateur radio transceiver and
the new switching supplies must beat with something
in the tranceiver to cause a low level tone
in my transmitted audio.

Are you able to switch things so you can hear signal from the
microphone without the transmitter active? I wonder if the RF might be
getting into the mic signal and causing the problem. What power level
and mode is the transmitter?
Also, the make-your-own-phantom with five 9V batteries as others
mentioned WILL tell you if the phantom supply is the problem, and will
surely last until you get a 'real' linear supply.

Does anyone have an older supply
for sale?


Also, any sugestions for eliminating this problem?
It would be a lot easier to use a switching supply.

Kent Tunks

-----
http://mindspring.com/~benbradley