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Old 26th February 2011, 11:32 PM   #1
SSDIY is offline SSDIY  Hong Kong
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Default Wiring a XLR plug

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.
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Old 27th February 2011, 12:03 AM   #2
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Quote:
Originally Posted by SSDIY View Post
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.

G
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Old 27th February 2011, 10:10 AM   #3
AndrewT is online now AndrewT  Scotland
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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
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Old 27th February 2011, 12:42 PM   #4
SSDIY is offline SSDIY  Hong Kong
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Originally Posted by stratus46 View Post
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.

G
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
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Old 27th February 2011, 12:49 PM   #5
SSDIY is offline SSDIY  Hong Kong
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Originally Posted by AndrewT View Post
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.
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Old 27th February 2011, 01:55 PM   #6
AndrewT is online now AndrewT  Scotland
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the XLR cable connects the two chassis.
Google gives 9.5M results to pin1 problem
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Last edited by AndrewT; 27th February 2011 at 02:05 PM.
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Old 27th February 2011, 04:26 PM   #7
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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.
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Old 27th February 2011, 11:40 PM   #8
SSDIY is offline SSDIY  Hong Kong
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Hi Andrwe & Kevin

I understand now. Thank you for giving the information.
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Old 28th February 2011, 01:20 AM   #9
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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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Old 28th February 2011, 01:34 AM   #10
SSDIY is offline SSDIY  Hong Kong
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Originally Posted by gray5596 View Post
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?
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