Support

HOME > Support

Basic of Wiring Method

[1] 3 wire method

COS-11D PT side

Microphone Amplifier side

PDF
(1) There is no gain because a signal is FET SOURCE output.
(2) It may have a positive phase output signal from positive sound wave.
(3) The left block is the COS-11D's circuit. An FET is included in the microphone head.

NOTE: Shown resistor is recommended value when DC voltage is +5V. 

[2] 2 wire method

COS-11D PT side

Microphone Amplifier side

PDF
(1) This method can have approx.10dB gain because of FET DRAIN output. 
(2) It might have unevenness in output level because of FET gm difference.
     It may have a negative phase output signal when it has a positive sound wave.
(3) The left block is the COS-11D's circuit. An FET is included in the microphone head.

NOTE: Shown resistor is recommended value when DC voltage is +5V