Josh Koffman 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
>   
Look at this link:
http://www.freeinfosociety.com/electronics/schematics/audio/coughdropmicmuteswitch.pdf
It shows how to do this with resistor, cap, and switch. Pretty comon in 
the audio world for discrete mute applications with balanced line inputs.

-- 
Regards,
Stephen D. Barnes

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