Wiring a XLR plug

SSDIY · 26th February 2011, 11:32 PM

Hello everyone

I bought this Neutrik PCB mount 3 pole XLR plug from Premier Electronics. The XLR plug has 4 pins. As far as I know #1 pin should be connected to GND, #2 to Cold & #3 to Hot but I have no idea about #4 therefore would anyone please tell me what is the function or connection of the # 4 pin of this plug?
Thanks.

stratus46 · 27th February 2011, 12:03 AM

Quote:

Originally Posted by SSDIY

Hello everyone

I bought this Neutrik PCB mount 3 pole XLR plug from Premier Electronics. The XLR plug has 4 pins. As far as I know #1 pin should be connected to GND, #2 to Cold & #3 to Hot but I have no idea about #4 therefore would anyone please tell me what is the function or connection of the # 4 pin of this plug?
Thanks.

That is actually a PC board mount jack so it will be a bit inconvenient to connect wires to. Pin 4 is the outer shell of the connector and it's generally connected to pin 1.

BTW in the US pin 2 is considered 'hot' and pin 3 'cold' but it's only a problem if the phase is reversed accidentally.

G²

AndrewT · 27th February 2011, 10:10 AM

Pin 4 would use a second shield or a drain wire to connect the two chassis together.
Pin 1 should be tested to exclude the Pin1 problem

SSDIY · 27th February 2011, 12:42 PM

Quote:

Originally Posted by stratus46

That is actually a PC board mount jack so it will be a bit inconvenient to connect wires to. Pin 4 is the outer shell of the connector and it's generally connected to pin 1.

BTW in the US pin 2 is considered 'hot' and pin 3 'cold' but it's only a problem if the phase is reversed accidentally.

G²

Hi stratus

Thank you very much for your inputs. Yes I need the US connection therefore I will correct the pins to read as:
Pin 1: Gnd
Pin 2: Hot
Pin 3: Cold

SSDIY · 27th February 2011, 12:49 PM

Quote:

Originally Posted by AndrewT

Pin 4 would use a second shield or a drain wire to connect the two chassis together.
Pin 1 should be tested to exclude the Pin1 problem

Hi Andrew

Thank you very much for your inputs too. But I do not surely understand what do you mean two chassis and what is pin 1 problem. Please give more details.
Thanks in advance.

AndrewT · 02:05 PM

the XLR cable connects the two chassis.
Google gives 9.5M results to pin1 problem

Speedskater · 27th February 2011, 04:26 PM

Pin #1 is NOT connected to Audio Ground.
Pin #1 is NOT connected to Power Supply Ground.

Pin #1 is connected to the Chassis with a very short wire.

SSDIY · 27th February 2011, 11:40 PM

Hi Andrwe & Kevin

I understand now. Thank you for giving the information.

gray5596 · 28th February 2011, 01:20 AM

The pin 1 problem Andrew mentioned has caused many a problem with RFI or ground loops. My favorite explanation to pin 1 problems is found in Rane's Handbook.

Grounding and Shielding Audio Devices

SSDIY · 28th February 2011, 01:34 AM

Quote:

Originally Posted by gray5596

The pin 1 problem Andrew mentioned has caused many a problem with RFI or ground loops. My favorite explanation to pin 1 problems is found in Rane's Handbook.

Grounding and Shielding Audio Devices

Hi Gray

This is a very good and clear diagram for wiring. Thank you for attach it here.

In this diagram, it has singal and chassis grounds, in addition, there will be a power ground, therefore there will have 3 grounds in an amplifier. Would anyone please correct me if I am wrong?

27th February 2011, 01:55 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	the XLR cable connects the two chassis. Google gives 9.5M results to pin1 problem __________________ regards Andrew T. Last edited by AndrewT; 27th February 2011 at 02:05 PM.

27th February 2011, 04:26 PM	#7
Speedskater diyAudio Member Join Date: Sep 2002 Location: Lakewood, Ohio	Pin #1 is NOT connected to Audio Ground. Pin #1 is NOT connected to Power Supply Ground. Pin #1 is connected to the Chassis with a very short wire. __________________ Kevin

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27th February 2011, 10:10 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Pin 4 would use a second shield or a drain wire to connect the two chassis together. Pin 1 should be tested to exclude the Pin1 problem __________________ regards Andrew T.

27th February 2011, 11:40 PM	#8
SSDIY diyAudio Member Join Date: Oct 2009 Location: Hong Kong	Hi Andrwe & Kevin I understand now. Thank you for giving the information.

28th February 2011, 01:20 AM	#9
gray5596 diyAudio Member Join Date: Mar 2008 Location: Midwest	The pin 1 problem Andrew mentioned has caused many a problem with RFI or ground loops. My favorite explanation to pin 1 problems is found in Rane's Handbook. Grounding and Shielding Audio Devices

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