CN222655324U - An electret microphone with a bandpass filter - Google Patents
An electret microphone with a bandpass filter Download PDFInfo
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- CN222655324U CN222655324U CN202421516863.XU CN202421516863U CN222655324U CN 222655324 U CN222655324 U CN 222655324U CN 202421516863 U CN202421516863 U CN 202421516863U CN 222655324 U CN222655324 U CN 222655324U
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Abstract
本申请公开了一种带有带通滤波器的驻极体麦克风，包括场效应管FET，场效应管FET的G极连接有麦克风一端，麦克风另一端接地，场效应管FET的S极连接有低通滤波模块，低通滤波模块连接有并联设置的负载电阻和高通滤波模块。具有以下优点：内置带通滤波器，通过带通滤波器减小低频和高频信号对麦克风的干扰，有效消除低频的振动和电信号干扰，内置负载电阻体积小占用更少的空间。
The present application discloses an electret microphone with a bandpass filter, comprising a field effect tube FET, wherein the G pole of the field effect tube FET is connected to one end of the microphone, the other end of the microphone is grounded, the S pole of the field effect tube FET is connected to a low-pass filter module, and the low-pass filter module is connected to a load resistor and a high-pass filter module arranged in parallel. It has the following advantages: a built-in bandpass filter, which reduces the interference of low-frequency and high-frequency signals on the microphone, effectively eliminates low-frequency vibration and electrical signal interference, and the built-in load resistor is small in size and occupies less space.
Description
Technical Field
The utility model relates to an electret microphone with a band-pass filter, belonging to the technical field of electronics.
Background
An electret microphone is a microphone commonly used in audio sound equipment devices, and is capable of converting sound waves into electric signals, and generally comprises a metal shell, and a metal pad, an electret structure, a plastic bracket, a metal back electrode, a field effect transistor and the like which are sequentially arranged in the metal shell.
In the prior art, the electret microphone is easy to be interfered by low-frequency and high-frequency signals in the use process, the microphone is often provided with problems such as movement or friction in the use process, the problems can generate low-frequency vibration and interference to cause instability of microphone signals, and the electret microphone on the market can normally work only by an external load resistor, so that the problem of design is caused for non-professional users.
Disclosure of utility model
Aiming at the defects, the utility model provides the electret microphone with the band-pass filter, the band-pass filter is built in, the interference of low-frequency and high-frequency signals on the microphone is reduced through the band-pass filter, the low-frequency vibration and the electric signal interference are effectively eliminated, and the built-in load resistor is small in size and occupies less space.
In order to solve the technical problems, the utility model adopts the following technical scheme:
The electret microphone with the band-pass filter comprises a field effect tube FET, wherein the G pole of the field effect tube FET is connected with one end of the microphone, the other end of the microphone is grounded, the S pole of the field effect tube FET is connected with a low-pass filter module, and the low-pass filter module is connected with a load resistor and a high-pass filter module which are arranged in parallel.
Further, the D pole of the FET is connected with one end of a capacitor C1, and is connected with a VCC power supply in parallel, and the other end of the capacitor C1 is grounded.
Further, the low-pass filtering module comprises a resistor R1, a capacitor C2 and a capacitor C3, one end of the resistor R1 is connected with one end of the capacitor C2 and the S pole of the FET, the other end of the capacitor C2 is grounded, the other end of the resistor R1 is connected with one end of the capacitor C3, and the other end of the capacitor C3 is grounded.
Further, the other end of the resistor R1 is also connected with one end of a load resistor R2, and the other end of the load resistor R2 is grounded.
Further, the high-pass filtering module comprises a capacitor C4, one end of the capacitor C4 is connected with the other end of the resistor R1, the other end of the capacitor C4 is connected with one end of the resistor R3, the high-pass filtering module is used as equipment of which the output end is connected with a client, and the other end of the resistor R3 is grounded.
Compared with the prior art, the utility model has the following technical effects:
According to the built-in band-pass filter of the microphone, the interference of low-frequency and high-frequency signals on the microphone is reduced through the band-pass filter, the low-frequency vibration and the electric signal interference are effectively eliminated, and the built-in load resistor is small in size and occupies less space.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
Fig. 1 is a circuit diagram of an electret microphone in the present utility model.
Detailed Description
In embodiment 1, as shown in fig. 1, an electret microphone with a band-pass filter includes a FET, a G pole of the FET is connected with one end of the microphone, the other end of the FET is grounded, a D pole of the FET is connected with one end of a capacitor C1, and is connected with VCC power supply, the other end of the capacitor C1 is grounded, an S pole of the FET is connected with a low-pass filter module, the low-pass filter module includes a resistor R1, a capacitor C2 and a capacitor C3, one end of the resistor R1 is connected with one end of the capacitor C2 and the S pole of the FET, the other end of the capacitor C2 is grounded, the other end of the resistor R1 is connected with one end of the capacitor C3, one end of the load resistor R2 and the high-pass filter module includes a capacitor C4, one end of the capacitor C4 is connected with the other end of the resistor R1, the other end of the capacitor C4 is connected with one end of the resistor R3 and is used as a device of an output terminal client, and the other end of the resistor R3 is grounded.
The FET is impedance conversion of microphone signal output, the output signal has a certain load capacity, the capacitor C1 is a high-frequency filter capacitor at the power end and is used for absorbing high-frequency interference signals at the power end, the capacitor C2, the capacitor C3 and the resistor R1 form low-pass filtering and are used for absorbing high-frequency interference signals from the outside, the resistor R2 is a load resistor and provides a power circuit for the FET tube core, and the capacitor C4 and the resistor R3 form high-pass filtering and are used for absorbing friction, low-frequency vibration and low-frequency electric signal interference.
The description of the present utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the utility model in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, and to enable others of ordinary skill in the art to understand the utility model for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (5)
1. An electret microphone with a band-pass filter is characterized by comprising a field effect tube FET, wherein the G electrode of the field effect tube FET is connected with one end of the microphone, the other end of the microphone is grounded, the S electrode of the field effect tube FET is connected with a low-pass filter module, and the low-pass filter module is connected with a load resistor and a high-pass filter module which are arranged in parallel.
2. The electret microphone with a band-pass filter of claim 1, wherein the D electrode of the FET is connected with one end of a capacitor C1, and is connected with a VCC power supply in parallel, and the other end of the capacitor C1 is grounded.
3. The electret microphone with a band-pass filter of claim 1, wherein the low-pass filter module comprises a resistor R1, a capacitor C2 and a capacitor C3, one end of the resistor R1 is connected with one end of the capacitor C2 and the S pole of the FET, the other end of the capacitor C2 is grounded, the other end of the resistor R1 is connected with one end of the capacitor C3, and the other end of the capacitor C3 is grounded.
4. The electret microphone with a band-pass filter according to claim 3, wherein the other end of the resistor R1 is further connected with one end of a load resistor R2, and the other end of the load resistor R2 is grounded.
5. An electret microphone with a band-pass filter as claimed in claim 3, characterized in that the high-pass filter module comprises a capacitor C4, one end of the capacitor C4 is connected with the other end of the resistor R1, the other end of the capacitor C4 is connected with one end of the resistor R3 and is used as a device with an output end connected with a client, and the other end of the resistor R3 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421516863.XU CN222655324U (en) | 2024-06-29 | 2024-06-29 | An electret microphone with a bandpass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421516863.XU CN222655324U (en) | 2024-06-29 | 2024-06-29 | An electret microphone with a bandpass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222655324U true CN222655324U (en) | 2025-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421516863.XU Active CN222655324U (en) | 2024-06-29 | 2024-06-29 | An electret microphone with a bandpass filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222655324U (en) |
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2024
- 2024-06-29 CN CN202421516863.XU patent/CN222655324U/en active Active
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