Where is the signal inject points for Bias setting on the D-47fET Microphone PCB

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Anode

Member
Joined
Jul 11, 2013
Messages
18
Location
Paris
Hi all,

I bought D-47fET Microphone PCB, where is the tests points for signal injection for Bias setting ? I know there is present on the 87 PCB but I didn't see on the 47 FET PCB.

Thanks by advance for your reply...

Take care :-\
 
To inject a test signal to the FET, you can simply add a 100 pF capacitor to the gate of the FET and feed the test signal through this capacitor.
In principle there is no need to decouple the microphone capsule.
 

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