[Elecraft] Electret microphone wiring

[Tom W8JI]

<<<<I am trying to use a cheap computer microphone in my K3, 
front 8 pin
connector. I have some doubts that I would like to solve 
before making a
mistake:

1- Can I use pin 1 directly atached to the electret capsule 
and set bias
in config:MIC SEL? Or should I use also some kind of 
resistor/condenser
arrangement to the 8V DC pin6?
2- For GND: shoul I use pin 7, pin 8 or both pins?>>>>


I just went through that. My Sennheiser headset now works 
fine using internal settings for bias.

Pin  7 and 8 are the same connection point. I do not believe 
it is best that they are the same, in my unprofessional 
opinion one should be a shield ground and one an audio 
ground, but they are the same.

I had to modify my audio input grounding to cure RFI. My 
headset has a long cord, and when I would stretch the cord I 
would get bad RFI with my yagi stacks pointed back at my 
house. Elecraft has a mod for this, but I changed more. I 
soldered the wire around the mic connector shell to the 
connector shell, and I grounded the circuit board pin 7 and 
8 via a copper foil that grounds under the cabinet screw in 
that corner.

Now I absolutely no RFI into the audio no matter what I do, 
and with the very long cord all stretched out like an 
antenna! The Elecraft mod was an improvement, but the copper 
foil was a total cure for me.

73 Tom