- Since 1946 Knowles has helped designers find more ways to put better technology to work for their customers. Knowles is a market leader and global supplier of advanced micro-acoustic, specialty components, and human interface solutions in the mobile communications, consumer electronics, medical technology, and other industrial end markets. Knowles’ deep experience and rigorous testing delivers consistently dependable and precise products including speakers and microphones for hearing health products, premium music earphones, communications headsets, and industrial acoustic applications. Knowles MEMS (micro-electro-mechanical systems) microphones and micro-speakers are widely used in smartphones, tablets, notebooks, and other portable devices. More...

Headquartered in Itasca, Illinois, and publicly traded on the NYSE under the symbol “KN”, Knowles has more than 10,000 employees in 37 locations worldwide includes design centers in Europe, Asia and North America. All manufacturing facilities are ISO-9001 certified, with some additionally certified to ISO-14001 or OHSAS-18001. The Knowles Quality Management System ensures design, integrity, efficient manufacturing and the cost effective on-time delivery of their products. Less...

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Go To Product Training Module Index Page

Digi-Key’s library of more than 2000 exclusive PTM Online… On Demand® product training modules is a collection of training tools created with you – the busy design engineer – in mind. They are provided with the cooperation of participating supplier partners. From this one source, you can learn about the latest products and technologies, download datasheets, check inventory, contact our technical staff, and place an order for same-day shipment.

These modules are available in audio and non-audio formats and listed by supplier in easy-to-find alphabetical order. Simply locate the module that interests you and click on your format of choice. We hope you find these tools useful, and with new modules added continuously, we invite you to stop back often to see what’s new.

Product Training Modules Online...On Demand® is a registered trademark of Digi-Key Corporation.

Updated PTM = Updated Product Training Module - PTM        New PTM = New Product Training Module - PTM

Module NamePreviewAudioNon-AudioDurationParts List
  • Designing Balanced Armature Earphones
3MB1.5MB10 minParts List
  • Introduction To Microphones
3.0MB704KB10 minParts List
  • Measuring the Frequency Response of Balanced Armature Drivers and Earphones
3.2MB1.4MB10 minParts List
  • Ultrasonic Applications for Knowles Electret and MEMS Microphones
2.1MB878KB5 minParts List
  • Using Dynamic Speakers and Balanced Armature Drivers in In-Ear Wearables
3.6MB962KB5 minParts List

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TM Series MicrophonesTM Series Microphones - Knowles' TM series microphone boasts performance comparable to the standard EM series, in a package 20% smaller. The TM can also be used in directional applications as a matched omni-directional pair.  More...

EM SeriesEM Series - Knowles' EM Series is the most popular omni-directional microphone offered. The EM can also be used in directional applications as a matched omni-directional pair.  More...

Application Notes

A Passive Current Source for Two-Wire Microphones
Application Notes for BL Series Microphones
Broader Band BK Application Notes
BT Condenser Microphone 2-wire Application Notes
CB Application Notes
DFG Directional Microphone
Directional Microphone Applications
Direct Mounting Considerations for FG Series Cylindrical Microphone
Effects of Acoustical Termination Upon Receiver Response
Effects of Sound Inlet Variations on Microphone Response
Effects of Source Impedance Upon Receiver Response
Effects of Variation of Supply Voltage on the Sensitivity of the BL Microphone
Effects of Variation of the Supply Voltage on the Sensitivity of the BT Microphone
Electronics Response Shaping of Directional Microphones
ESD and Low Frequency Voltage Noise Related Issues to the Improved EM Microphone
Ferrofluid damped ED receivers
Improved EM Microphone
Lead-Free Soldering to Hearing Aid Transducers
Magnetic Leakage for Receivers
Marking of Microphone Pairs
Mounting Application Notes
Receiver Testing: Maximum Current Modulation (MCM)
Soldering Transducer Leads
Stability of Amplifier Systems Connected to the BL Microphone
The Effect of Acoustic Damping Plugs on Receiver Response
The Measurement and Suppression of RF Interference from TDMA Phones
The Transducer Environment
Transducer Signal Port Location Key
Ultrasonic Applications for Knowles Electret and MEMS Microphones
Vibration Sensitivity of Knowles Microphones
Walk Induced Head Vibrations and Hearing Aid Design
Wideband Receiver Application Bulletin

Product Information

Acoustic Interface Design Guide 2010
Mic, Receiver, and Speaker Portfolio 2012
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