Series:	BT
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	Electret Condenser
Output Type:	Analog
Direction:	--
Frequency Range:	100Hz ~ 4.2kHz
Sensitivity:	-59.5dB ±3dB @ 74dB SPL
S/N Ratio:	--
Impedance:	3.5 kOhms
Voltage - Rated:	1.3V
Voltage Range:	0.9V ~ 10V
Current - Supply:	40µA
Port Location:	Side
Termination:	Solder Pads
Size / Dimension:	0.310" L x 0.218" W (7.87mm x 5.54mm)
Height (Max):	0.090" (2.29mm)
Shape:	Rectangular

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Microphones – BT-21754-000 Application Field and Working Principle

Introduction

Microphones are an essential tool for recording and reproducing sound, and for suppressing unwanted noise. Every microphone deployed in a recording or listening environment has different characteristics, features, and uses. The BT-21754-000 is a microphone designed to function specifically in harsh environments where intense sound levels may be present. It is suitable for a wide range of fields and applications, from audio recording and sound reinforcement in live broadcasts, to medical applications and other scenarios where the precision of sound reproduction or measurement is critical.

Application Field

The BT-21754-000 microphone is available in several shapes and sizes depending on the specific application and use case. Its most notable feature is its heavy-duty construction, which enables it to withstand immense sound pressure levels. As such, it is suitable for locating in areas where loud noises are generated – stadiums, theatres, and other places where sound amplification is required.The BT-21754-000 is also often employed in medical applications such as ultrasound transmission. Its reinforced construction and flexible shape make it particularly well-suited for such uses, where clear and accurate sound reproduction is essential.Another application of the BT-21754-00 is in speech recognition settings. In applications of this kind, the microphone’s extreme precision is necessary in order to accurately capture and identify spoken phrases and commands.

Working Principle

The BT-21754-000 microphone uses a dynamic microphone principle. This is based on the use of a magnet and coil. When sound waves cause the diaphragm to vibrate, the resulting electrical impulses are created as a voltage variation across the coil. This electrical signal is then sent to the amplification circuitry, where the magnetic field alternates according to the sound waves’ intensity. The resultant signal is similar to that of musical instruments’ sound waves and is routed through a microphone preamplifier to increase its voltage. The amplified signal is then sent to the microphone’s output jack, where it can be connected to a recorder, an audio amplifier, or any other device that requires an external microphone.

Conclusion

The BT-21754-000 is a dynamic microphone with heavy-duty construction designed for use in extreme sound pressure conditions. It is suitable for various applications, such as sound amplification in stadiums and live events, ultrasound transmission in medical care, and speech recognition systems. At its core, the BT-21754-000 microphone works on a dynamic principle involving a magnetic field varying as a response to sound pressure, and then amplified to be sent to an output jack.

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