The principle is the same as the moving-coil microphone, the vibrating metal sheet is moving in the magnetic field of a permanent magnet and so a current that matches the variations in the vibrating r...The principle is the same as the moving-coil microphone, the vibrating metal sheet is moving in the magnetic field of a permanent magnet and so a current that matches the variations in the vibrating ribbon is created. One problem of the above three types of microphones is that the phase of the electrical signal lags the phase of the original vibrations by a quarter of a wavelength.
