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Products

Microphones

Applications
Battery Powered Devices
Headsets
Burglar Alarms
Video Cameras
Voice Recorders
Music Recorders
Attributes of MEMS microphones Attributes of ECM microphones
better performance  needs to be larger for equal performance
reflow solder possible Hand or point soldered
higher cost low cost
less part to part variation greater part to part variation
less temperature sensitivity greater performance variation with temperature

Receivers

Applications
Headsets
Telephones
Earphones
Cell Phones
Attributes of Receivers
Small size

Sound volume limited to ear distance

Low Power

Sounders/Alerts

Applications
Battery Powered Devices
Car Alarms
Smoke Alarms
Fire Alarms
Panel Indicators
Keypress Indicators
Door Chimes
Medical Device Alerts
Intercom Speakers
Sirens
Alarms
Attributes of Piezo Sounders Attributes of Magnetic Sounders
low current higher current
very loud (greater than 120 dB at 30cm) Needs more power to reach sound levels
small size (SMDs available)  
single or multitone wider bandwidth
frequency depends on size. (low frequency=large size) low frequencies in small size 

Speakers

Applications
Any application of voice or music
Attributes of Piezo Speakers Attributes of Magnetic Speakers
low current higher current
lower bandwidth wide bandwidth of sound
small size (can be very thin)  
low sound volume volume limited only by power and size
low fidelity very high fidelity

Ultrasonic

Applications Transducers
Pest Repellents
Vaporizers
Ultrasonic Cleaners
Ultrasonic Mixers
Applications of Sensors
Motion Detectors
Proximity detectors
Attributes of transducers Attributes of ultrasonic sensors
Transmit only  Contains transmitter and receiver functions in one unit
High Power Typical range is 3m