Sample Microphones used in Melody hearing aids

Hearing aid microphone - Dimensions: 2.59mm dia. x 2.59 mm (0.102in dia. x 0.102in)	Relative size of our Melody open fit hearing aids Length: 2.8 cm. or 1 1 /8" Height: 1 cm. or 7/16" Width: 6 mm. or 1/4"

The following information is provided by Knowles Electronics
 

Knowles FG/BFG Series Microphones (picture shown above)

The FG Series microphone is the world's smallest electret condenser microphone. Its cylindrical shape and compact size provide for superior fit rates. The FG can also be used in directional applications as a matched omni-directional pair. The BFG is an improved version of the FG microphone and offers enhanced PFA performance and power-on reset for instant settling time. Its electrical high pass filter enabling custom corner frequencies makes the BFG ideal for use in directional applications as a matched omni-directional pair.

Features

• Small size is ideal for multiple applications
• Rugged
• High resistance to mechanical shock
• Exceptionally low vibration sensitivity
• Various responses available
• Integral RFI suppression
• BFG offers improved Power Feed-through Attenuation, improved settling time, and electrical high pass filter
• Custom corner frequencies achieved through electrical high pass filter optimize noise performance at low frequencies for demanding matching and directional applications