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If applying an external voltage, it is highly recommended that test leads be made up with a microphone plug and an inbuilt series resistor.
 
If applying an external voltage, it is highly recommended that test leads be made up with a microphone plug and an inbuilt series resistor.
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[[File:Audio 680 ohm.jpg]]
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<i> 680 ohm series resistor on a 3.5mm audio plug</i>
    
==Voltage Mode==
 
==Voltage Mode==
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