LM2904 Sound Intensity Detection Module Analog Decibel Detection Noise Control Sensor Microphone Module

LM2904 Sound Intensity Detection Module Analog Decibel Detection Noise Control Sensor Microphone Module Description

1. Utilizes an original, high-sensitivity microphone capsule paired with an LM2904 operational amplifier, offering the advantages of low power consumption and minimal total harmonic distortion.
2. Features high sensitivity; in a confined environment, normal speech can be detected from a distance of to 10 meters.
3. Provides a direct linear analog output, greatly simplifying the process of Analog-to-Digital (AD) data acquisition and eliminating many of the difficulties typically associated with direct waveform sampling. It can also be utilized directly as a decibel sensor (though this requires conversion via software algorithms).

Due to excessive ambient noise in the detection environment, the displayed sound intensity curve exhibits significant fluctuations; however, the continuity of the sound signal waveform remains clearly visible.
Product Application Scopes:
Suitable for detecting environmental parameters such as: sound volume, presence/absence of sound, whistling, and sound intensity. *Note: This product cannot identify specific sound frequencies and is therefore unsuitable for applications requiring the detection of particular frequency bands.
Usage Recommendations:
1. To ensure the quality of the output signal, please use a stable power supply with minimal ripple whenever possible.
2. To achieve a higher output signal amplitude, the module's supply voltage may be increased; however, this voltage must not exceed the module's specified allowable operating range.
3. When using an ADC chip for data acquisition, it is recommended to connect an external pull-down resistor (ranging from 1kΩ to 10kΩ) between the output pin and ground. The specific resistance value should be selected by the user based the requirements of their particular application scenario.
Color:
Material: plastic

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