On 16/05/2011 15:28, Michael Watterson wrote:
> Electret is only 1.5V AA cell or button cell.
> True Condenser mic is 100s of Volts I think.

I'm not sure about the above - what makes you say this?
I am aware of a couple of unusual types but AFAIK, the vast majority of=20
condenser mics use the standard 48V phantom power present on most=20
preamps/mixing desks. The current is pretty low, generally being=20
supplied through pins 2 and 3 via ~6K65 resistors.
On researching this for our preamp, I discovered that some (generally=20
cheaper) equipment does not supply the full 48V, taking advantage of the=20
fact that many microphones work fine with less. Some go down to as low=20
as 9V IIRC. This can cause issues with mics designed to work with the=20
full phantom voltage.
Of course there are tube mics that require a high voltage supply, but=20
that's different.



> Do you REALLY mean Condenser or Electret?
>
> Use a 600 Ohm isolation transformer if concerned about connection to
> mixer desk earth via wet mic.
>
> Electrets and Condenser mics don't like damp never mind wet. You can buy
> weather proof and water proof mics with XLR off the shelf though.


--=20
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