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Old 10th September 2010, 12:11 AM   #11
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Pin 1 = chassis, it is not part of the signal or signal ground.
Pins 2 an 3 are the audio signal. Although pin 3 may be only a resistor network with no active components.
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Old 1st March 2016, 08:51 PM   #12
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Question Question: XLR Mic to PC, after 48V power supply

Hi there everybody!
I see there are lots of experts here, perhaps I can get my questions answered.

I have a condenser mic that needs 48V phantom power to work. check.
I've got a 48V phantom power supply. check.
It has a XLR INPUT and a XLR OUTPUT.

Now, my question is:

Can I make a cable (XLR) to (1/8") to connect that OUTPUT into my PC SOUND CARD input (green jack)????

pin XLR-1ground to 1/8"-ground
pin XLR-2hot to 1/8"-left
pin XLR-3cold to 1/8"-right

I will fry my PC????? Or it will get some sound??

In case it works, I have another theory:

Since hot and cold are out-phased in 180, with Pro Tools if I reverse Cold,
it will get a 2 times boost in the amplitude when I sum both signals.
Also, assuming the noise were the same in hot and cold before I reverse cold... The noise will also be inverted, which would give me a noise suppressor, because the noises are exactly the same in each pin, but out-phased after I inverted, therefore one noise would cancel each other.

Does it work???

Thanks everybody!
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Old 5th April 2016, 11:02 PM   #13
MAAC0 is offline MAAC0  Portugal
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Join Date: May 2010
Jesus .... So simple

Assuming you are connecting mic to xlr in and getting audio from the phantom box xlr out.

For Computer mic input use a mono plug or short ground and sleeve
Computer Bias will be shorted to ground. That's no problem.

pin XLR-1ground to 1/8"-ground
pin XLR-2hot to 1/8"-tip
pin XLR-3cold to 1/8"- ground or sleeve shorted

For line input use a stereo plug

pin XLR-1ground to 1/8"-ground
pin XLR-2hot to 1/8"- tip and sleeve
pin XLR-3cold to 1/8"- ground

Check levels and use line or mic what sounds best.
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Old 5th April 2016, 11:04 PM   #14
MAAC0 is offline MAAC0  Portugal
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You can also experiment no connecting the cold signal, depends on the output topology.
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Old 5th April 2016, 11:08 PM   #15
tomchr is offline tomchr  Canada
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You'll need to implement phantom power. Here's Wikipedia on the topic:

Modulus-86: Composite amp achieving 0.000067 % THD. Damn Good 300B, Novar Spud, 21st Century Maida Reg., Filament Reg., etc.
Neurochrome : : Audio - http://www.neurochrome.com - Engineering : : Done : : Right
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Old 6th April 2016, 01:39 AM   #16
JMFahey is offline JMFahey  Argentina
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The 48V external power supply already takes care of that.
Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.
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Old 10th April 2016, 05:31 AM   #17
Odal3 is offline Odal3  United States
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...Or you can get a pro-audio USB recording interface. Not sure if you have a mic preamp but you will likely need one plus the internal mic-in/sound card may not be the best. Most route mics via USB or firewire interfaces. Unless you desire top of the line, you can get a used one for $50-150 or a new one for $100-200. I recently picked up a Steinberg UR22mkii, which has 2 mic/line in (XLR - 1/4 combined jacks) with preamp and 48V phantom power, USB2 and two 1/4 outputs. Been very happy with it so far. There are also many other brands such as Focusrite and Presonus.
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Old 21st April 2016, 12:36 AM   #18
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Same as above reply... It is basically insane to not use a purpose built audio interface for this.

Problem 1: You need a microphone preamplifier, most importantly, as the output even from a powered tube mic is still microphone level, not line level.

Problem 2: You should make use of the balanced output by having a balanced input to the soundcard. The onboard soundcard does not have this. Shorting the cold pin to ground is not ideal.

Just buy a USB or PCI audio interface that has microphone inputs. Many come bundled with a DAW (digital audio workstation) program like Cubase or Pro Tools (light versions, which will be adequate for your use). If not, there are several free programs available which will do the job.
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Old 28th April 2016, 05:30 AM   #19
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Audacity is free and Will do the job. Two Channel USB soundcard with XLR cost very Little money.
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Old 28th April 2016, 06:53 AM   #20
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Location: Randers, Denmark
Probably the cheapest way without phantom

the t.bone USB 1X - Thomann Danmark

There is also an adaptor with 48 volt phantom for very little money.

or a dedicated box

Behringer U-Phoria UM2 - Thomann Danmark
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