Telex 850 ?'s - mic bias

[GuinessGuy]

Works well in the 320..........

 

[Redeyes]

I love mine, but in the 3 years I have owned it, I have had to send it back twice due to malfunction.

They work great in the CRJ and 737.

 

[tathepilot]

Thanks for all the info, but does anyone have an answer to my original question?

 

[FlyinGuy]

Nope....

 

[Stukadriver]

http://en.wikipedia.org/wiki/Voltage_bias

Any EE's correct me if I'm wrong, but I believe the mic bias in this case is the voltage constantly going to the microphone which enables the hot mic function of the intercom.

Does toggling the I/C switch on in the 737 have any noticeable effect, or is the CVR voltage enough to give you the full ANR?