Pinouts of Audio / Video hardware connectors  > device-specific pinouts
Description (may be empty)
Pin 1 Ground  Says by itself...
Pin 2 Mic Input  (or Audio +)
Pin 3 +5v Bias  
Pin 4 +5v Through 3k Ohm resistor  

These are for EV beltpacks only as each manufacturer has it's own pinout standards for ta4 connectors

4 pin unspecified connector layout
4 pin unspecified connector
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TA4 TA4F TA4M for EV Electro-Voice Beltpacks visual pinout:
TA4 TA4F TA4M for EV Electro-Voice Beltpacks diagram
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