Bone Conduction Microphone Capsule 9.7mm

9.7mm Bone Conduction Microphone Capsule

The ECM-B9745AL70-318A is a 9.7 × 4.5 mm omnidirectional microphone capsule tailored for pulse collection, stethoscopes, and drum pickup applications. Featuring a sensitivity of -70dB±3 and a signal-to-noise ratio of 40dB, it excels in capturing precise sound for medical diagnostics and audio recording purposes.

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Minimum order quantities (MOQs) apply.
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🧪 Sample

Free (std. models) + shipping

🧭 Trial Order

From 200 pcs (1st order only)

📦 MOQ

5,000 pcs (mixed models allowed)

Model: ECM-B9745AL70-318A
Dimensions: 9.7 × 4.5 mm
Directivity: Omnidirectional
Sensitivity: -70dB±3
Impedance: 2.2KΩ
S/N Ratio: 40dB
Max SPL: 125dB
Operating Voltage: 4.5Vdc
Frequency Response: 100Hz~20KHz

Tags: 9.7mm Electret Equipment Mics Solder Pads Electret

Technical Specifications

Our 9745 high-fidelity bone conduction microphone core features precise pulse pumping and high-sensitivity micro-vibration sensors, ensuring accurate signal transmission and resistance to interference, resulting in superior audio performance.

Standard Test Circuit

ECM-B9745AL70 Test Circuit: 2.2kΩ bias, 4.5V supply, 1μF output

Test circuit employs a 2.2kΩ bias resistor, 4.5V DC supply voltage, and 1μF output coupling capacitor, optimized for bone conduction signal acquisition.

Typical Frequency Response

ECM-B9745AL70 Frequency Response: 100Hz–20kHz with characteristic peaks

Frequency response ranges from 100Hz to 20kHz, with a smooth and stable response from 100Hz to 3kHz, a sharp peak at 5kHz for enhanced signal detection, followed by a rapid decline toward 20kHz.

Dimensions (Unit: mm)

ECM-B9745AL70 Dimensions: Φ9.7×4.5mm bone conduction microphone capsule

Bone conduction microphone capsule measuring Φ9.7×4.5mm, specifically designed for medical applications such as pulse detection and electronic stethoscopes.

Packaging Overview

Standard packaging: 100 pcs per small box.
10 small boxes (1,000 pcs) are combined into one medium carton.
Several medium cartons are further packed into a large outer carton.
Pin-type microphones are protected with foam inside the small box.
Other types are packed directly or sealed in anti-static bags.

Reliability Tests

High Temperature Test: Microphone subjected to +80℃ for 100 hours, followed by 3 hours at room temperature.

Low Temperature Test: Microphone subjected to -40℃ for 100 hours, followed by 3 hours at room temperature.

Humidity & Heat Test: Microphone exposed to +55℃ and 85% relative humidity for 100 hours, followed by 3 hours at room temperature.

Thermal Shocking Test: Microphone subjected to [+80℃ 0.5H → room temp 1H → -40℃ 0.5H → room temp 1H] for 10 cycles, then exposed to room temperature for 3 hours.

Vibration Test: Microphone subjected to two hours of vibration in x, y, and z directions with frequencies of 10-55Hz and a 1.52mm amplitude.

Drop Test: Microphone dropped 5 times from a height of 1.0 meter onto a slippery marble floor, without packaging, and still performs normally.

Storage and Operating Temperature Range: Suitable for environments ranging from -35℃ to +60℃.

Sampling Process

Confirm customer requirements:

Review product application, microphone capsule specifications, usage scenarios, and sound quality needs.

Recommend and specify:

Provide recommended microphone capsule models and detailed specifications for customer evaluation.

Sample provision and testing:

Deliver microphone samples for customer testing and feedback purposes.

Optimize and finalize:

Refine microphone design based on feedback, finalize samples, and proceed to mass production upon quality approval.

Quality Assurance

Conducting sampling inspections of incoming materials to ensure compliance with standard requirements.

Performing inspection audits to ensure the stability and control of the entire manufacturing process.

Conducting pre-shipment inspections to ensure that products meet established quality standards.

Acoustic Laboratory

Testing of background noise, sensitivity, frequency response curve, and directionality indicators.

Verification of the impact of different circuits, structural dimensions, materials, and processes on indicators.

Reliability testing at both the new product design stage and the mass production regular stage.

Automatic Workshop

Utilizing fully automated production lines to ensure high efficiency and consistency.

Equipped with state-of-the-art facilities, including a 10,000-level dust-free workshop.

Employing a rigorous 21-step process to guarantee product stability.