[Milsurplus] SIMPLE Carbon Microphone Substitute.

[Kenneth G. Gordon]

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