MAKE A MEME View Large Image Western electrics rundradiomikrofon i sitt skyddande fodral, Nordisk familjebok.png Early Western Electric Model 357 double-button carbon microphone in 1B housing from early 1920s The double-button was an improved carbon microphone design ...
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Keywords: Western electrics rundradiomikrofon i sitt skyddande fodral, Nordisk familjebok.png Early Western Electric Model 357 double-button carbon microphone in 1B housing from early 1920s The double-button was an improved carbon microphone design developed by Western Electric the manufacturing arm of the Bell Telephone system AT T around 1921 that was very widely used for the first AM radio broadcasting as well as for PA systems and recording throughout the 1920s It is often seen in period photos in its ring and spring form with the housing removed as a small microphone cylinder suspended in the center of a metal ring by springs The springs visible above through the holes isolated the microphone from vibrations of its supports The first carbon microphones had the carbon cell or button attached to one side of the diaphragm which picked up the sound This caused harmonic distortion because the change in the carbon's resistance was nonlinear different for inward compression and outward tension displacements The double-button design had two carbon buttons one attached to each side of the diaphragm connected in a push-pull circuit which canceled even-order harmonic distortion The stiff duralumin diaphragm had a very high resonant frequency and air damping further reducing distortion and giving it a flat frequency response The cost for this higher fidelity was that it had very low output however http //runeberg org/nfcr/0059 html 1926 From http //runeberg org/nfcr/0059 html PD-Ugglan PD-Sweden-photo Western Electric microphones Carbon microphones CleanFFT
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