[ARC5] Carbon cartridge replacement circuit

[Roy Morgan]

J,

I have more than one microphone used in Navy planes (helicopters) in the
60's and 70's.  I am not sure if these are carbon microphones or dynamic
ones (we did use little inline amlifiers at about that time with some of
the lip mikes we had.)

Can you give any hints as to how to determine which is which?  Resistance
maybe? One is gray and another one or two are black.  They mounted on the
helmets.

Oh yes, I will look on them for some sort of nomenclature - I bet I'll find
something.

Roy


On Mon, Apr 24, 2017 at 9:06 PM, J Mcvey via ARC5 <arc5 at mailman.qth.net>
wrote:

> Hello all ,
>
> I finally got this drawn up and published.
> This circuit will produce up up to  about 4 vpp without clipping.
> It has  more than enough gain to produce maximum modulation without
> yelling into the mike.
> Enjoy;
>
>
>
>
> https://www.mcveyelectronics.com/images/stories/pdf_files/
> electret_carbon_rpl.pdf
>
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-- 
Regards,
Roy

Roy Morgan
k1lky since 1958
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