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3 pin XLR female connector layout
Разъем 3 pin XLR female

 

Device 1
Pin Number
Device 1
Pin Name
Direction Device 2
Pin Number
Device 2
Pin Name
Description
1 GND OUT 2 GND Ground
2 Signal OUT 1 Signal Mono Out
3 GND OUT 2 GND Attached to pin 1

This is correct assuming that the cable used is a two wire (1 conductor and 1 shield) cable. And also only when working with high level signals. If a three wire standard microphone cable is used, the third pin is a signal -.  It is to be connected to the sleeve (pin 2-ground) at the 1/4 in. connector.
For a low level signal, note that a standard XLR connection is for a balanced input, which is normally a low impedance input.  The 1/4 inch is normally high impedance. A mismatch will cause a sometimes considerable loss of signal at low signal levels normally found in a microphone source. The correct way to connect the two without signal loss is by an impedance matching transformer, or balanced to unbalanced matching device (or more commonly referred to as simply a balun.)

2 pin MONO plug connector layout
Разъем 2 pin MONO plug
На распиновку XLR to 1/4 Mono есть 3 отзыв(а): 2 положительных и 1 отрицательных.

Эта распиновка
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