Traditionally a microphone is considered to be a relatively large electromechanic component that involves coils and bias currents. In the recent years the MEMS techniques have revolutionized also this area of sensors. The constant shrinking and lower power consumption of sensors makes us curious of the possible use cases those open.One example of a small and energy efficient microphone is the Analog Devices ADMP404. Its dimensions are 3.35 mm × 2.50 mm × 0.88mm, which is rather small even for a MEMS microphone. The budgetary price listed by the manufacturer is $1.20@1kpcs, which should not be a deal breaker for most of the applications.
