[Boatanchors] Carbon Mic Rejuvenation (& related)

[Richard Knoppow]

----- Original Message ----- 
From: "mac" <w7qho at aol.com>
To: "Bill Carns" <wcarns at austin.rr.com>; 
<boatanchors at mailman.qth.net>
Sent: Saturday, March 16, 2013 12:51 PM
Subject: Re: [Boatanchors] Carbon Mic Rejuvenation (& 
related)


> 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
>
     Exactly the point I was trying to make except you said 
it better:-)


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com