A low-power milliwatt electromagnetic microspeaker using a PDMS membrane for hearing aids application

This paper demonstrates a low-power electromagnetic microspeaker with a PDMS membrane for hearing aids application. For a 1.76mW power input, the speaker with a 3.5mm in diameter and 3.3μm thick membrane can generate a sound with the sound pressure level (SPL) of 106dB @1kHz in a 2c.c. coupler.