Sheep magazine Archive 2: issues 10-17


Lefty online magazine: issue 10, May 2016 to issue 17, November 2016




adapted from Martin MITCHELL

T45 Noise-Cancelling Microphone (1944)

In 1942 after America entered World War 2, the US military estimated

that only 20% of radio communications in combat were successful.

Failure in the other 80% was mainly due to the voice of the radio

operator being drowned out by the surrounding cacophony of war.

Like no other conflict before, success on the battlefield relied on

communications. Spotting a gap in the market Al Khan and Ed Burrows,

the owners of Electro-Voice, came up with a brilliantly simple, ingenious

and cost effective solution to this problem.


Even in 1942 the single button carbon microphone was a piece of old

fashioned tried and tested technology, having been in use in telephones

since the tail end of the previous century. Although the audio quality of

the T45 is little better than it’s telephonic predecessors it is extremely

reliable and very robust. It also has a high output making it ideal for long

distance communication. Even if the microphone gets wet you can simply

dry it out (as per the instructions above) and it will carry on working!

However, the really clever part of this design utilises 2 small holes of

equal size on the front and back of the mic. These allow the surrounding

June 2016

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