1. BITX20@groups.io

Re: uBITX Mic Wireup

Clark Martin
 


Clark Martin
KK6ISP

On Mar 10, 2018, at 12:10 PM, Anthony Luscre <k8zt73@...> wrote:

I am not clear on the mic wiring.
  • Is it polarized (which terminal is which on mic)?
As a general rule, one of the terminals on an electret mic is attached to the metal case while the other is insulated from the case.  The terminal attached to the case is ground.  The other, insulated, terminal is signal.

  • Is there a capacitor that is to be included in wiring?
There is a capacitor on the µBitX board, C61.  You don’t want to connect the microphone through a capacitor, it needs a DC bias (also on the board).
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