9.7mm Unidirectional Electret Microphone Insert for Violin Pickup

The ECM-B9750UL45-201 is a 9.7 × 5 mm unidirectional microphone capsule designed for instrument pickup applications, such as violin and guitar. It boasts a sensitivity of -45dB±1 and a signal-to-noise ratio of 58dB, ensuring clear audio reproduction.

Model: ECM-B9750UL45-201
Dimensions: 9.7 × 5 mm
Directivity: Unidirectional
Sensitivity: -45 dB ± 1
Impedance: 2.2 kΩ
S/N Ratio: 58 dB
Max SPL: 110 dB
Operating Voltage: 2 Vdc
Frequency Response: 100 Hz ~ 16 kHz
Current Consumption: 500 μA

Request Information / Sample

Tell us your project stage. Our engineering team will respond accordingly.

Lead Time

Samples: 1–3 weeks
Mass production: 2–4 weeks

Customization

Application-based engineering support
Structure / sensitivity / acoustic tuning

MOQ

3,000 pcs
Per model / per production batch

Certification

RoHS & UL compliant
Industrial reliability assured

Technical Specifications

Utilizing stable and reliable Korean RF JFET components, our 9750 single-directional noise-canceling microphone features an internal dual-capacitor design that effectively shields against RF interference, ensuring high-fidelity sound reproduction.

Standard Test Circuit

Test circuit configured with RL=2.2KΩ, VS=2V, and C=1μF.

Typical Frequency Response

Frequency response gradually rises from 100Hz, peaks around 10kHz, then begins to decline toward 16kHz.

Dimensions (UNIT: mm)

Appearance Dimension

Capsule measures 9.7mm in diameter and 5mm in height, with a front dust mesh and a rear acoustic port for clear sound pickup.

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.