I'm not an audio guy, but it seems to me that you need to use a double
pole double throw make before break switch that switches the lines to
a resistor.

There are variations on that theme to make it 'better' but the idea is
that the make before break places the resistor across the line before
disconnecting the microphone.

Could probably simplify by only siwtching one side, but it might cause
noise issues, etc.

-Adam

On Wed, Jan 21, 2009 at 11:20 PM, Josh Koffman <joshybear@gmail.com> wrote:
> Hi all. Well, another week, another 1000 emails behind, and another
> project tossed at me at the last minute.
>
> Here's the latest. I've been asked to help with muting a microphone
> via footswitch.
>
> Here's the longer story. The microphone in question is balanced and
> has an impedance of 1K ohm. While I could do this mechanically that
> would result in a loud pop each time the switch changes position. So
> I'm thinking perhaps a 4066 CMOS switch to make/break both mic lines
> simultaneously. I'm not super concerned about this being really hifi
> audio. I am slightly concerned about leaving the audio input
> "floating" when the switches are open.
>
> Any thoughts?
>
> Thanks!
>
> Josh
> --
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