[Milsurplus] SIMPLE Carbon Microphone Substitute.

[COURYHOUSE at aol.com]

ah... what about a carbon microphone element  from an  old  telephone 
handset?
Ed#
 
 
In a message dated 5/28/2016 9:07:10 A.M. US Mountain Standard Time,  
kgordon2006 at frontier.com writes:

On 28  May 2016 at 9:25, David Stinson wrote:

> Been working on a simple  substitute for the Carbon 
> microphone used with the BC-669.  I've  seen some
> multi-IC, 3-dozen-part designs which hugely violate
>  The Law of Pernicious Parts Count:
>      "Every part in  a project beyond about eight
>      reduces the number of  people who will build it
>      by 50%."
> So no  one builds them.  I hope this one 
> will get tried and  improved:
> 
> https://goo.gl/photos/26HUmzVuqhZKWrNZ7
>  
> Cobbled it together and it works well with the BC-669.
> I  picked that transistor because it was the first one 
> I grabbed from  the "NPN Small Signal" drawer and
> my Android phone called it "General  Purpose."
> Other common NPNs will likely work as well.
> The  electret element isn't mark +/-.  I soldered it in 
> one way and  it didn't work.  Turned it around and it did.
> Will try it on  other rigs as the weekend goes on.
> 
> 73 DE Dave AB5S

A  perfect example of my favorite principle, David. KISS. :-)

Well  done.

Ken  W7EKB
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