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* AC coupled output
 
* AC coupled output
 
* 13.8VDC (max) power
 
* 13.8VDC (max) power
* Attach decade resistor box between power supply + side and Electret mic + side
+
* Attach decade resistor box
** Adjust decade resistance value to measure 4V across mic with 13.8 VDC supply
+
* Adjust resistance to measure 4V across mic with 13.8 VDC supply
 
** 2V with 12V power supply
 
** 2V with 12V power supply
 
* Selected value = 33K Ω pullup to 13.8V gets 4V across mic
 
* Selected value = 33K Ω pullup to 13.8V gets 4V across mic

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