[Elecraft] Koss SB-45 Headset, update on comfort

[Bob McGraw K4TAX]

One other point is  many professional type condenser or like type mikes 
do have internal active amplification.  They require a couple of 
miliamps of operating  current as opposed to just placing a charge on 
the element.   In this case it is normal for the mixing console to 
provide "phantom power" which is sent along the mike line between the 
console and mike.  For those consoles that do not have internal phantom 
power systems, a separate external source is required and provided.

73
  Bob, K4TAX

On 1/6/2016 2:22 PM, n9tf at comcast.net wrote:
> Gus,
>    
> I think the term bias, or bias voltage is a pretty generic term when meaning applying a voltage or current to turn on a device, in this instance a microphone element that requires voltage to operate.
>    
> http://www.learningaboutelectronics.com/Articles/What-is-bias-voltage