[78-L] microphone technology

[Steven C. Barr]

----- Original Message ----- 
From: "David Lennick" <dlennick at sympatico.ca>
> Not that Brunswick was ever known for using up-to-date technology once it 
> went
> electrical. I very much like that performance, by the way. Wish I could 
> find
> the late laminated pressing of it. They also kept the volume down and 
> pressed
> on noisy shellac which got worse by the 1930s.
>
Prior to some unknown (to me) point in the late 1920's..."Microphone 
technology"
had gotten as far (and stopped at!) the "carbon microphone" which was 
basically
the "talking" half of a telephone handset." This required (and moduilated) a 
steady
DC voltage supplied by a battery in telephones. At the unknown point, 
crystal
(later  ceramic) microphones were introduced; these translated motion of 
their
diaphragms into electric current  at  (more or less) the 1-volt level now 
known
as "line level."

I leave further detailas to those who know...!

Steven C. Barr