[Boatanchors] Carbon Mic Rejuvenation (& related)

[rbethman]

Mac, (or Dennis whichever you prefer...)

I think you have hit the exact description!

The rest of the conversation was essentially theoretical, in lieu of actual.

Bob - N0DGN


On 3/16/2013 3:51 PM, mac wrote:
> Bill is correct about passive elements and power gain.  Perhaps some 
> of the confusion here centers around consideration of a carbon 
> microphone as a "passive element." Standing alone it certainly is, 
> just as a vacuum tube with no filament or B+ applied would be 
> passive.  Put the tube in a practical circuit though, i.e., power 
> source and a load impedance and it becomes the "active " element we 
> usually consider it to be.  So, would a carbon mic augmented with a 
> load impedance and bias (power) supply now (properly) be considered an 
> "active" element?  Different from a crystal or dynamic mic neither of 
> which require a bias (power) source to operate.  Academic question but 
> interesting.....
>
> Dennis D.  W7QHO
> Glendale, CA