CN213906859U - Transistor capacitor microphone - Google Patents
Transistor capacitor microphone Download PDFInfo
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- CN213906859U CN213906859U CN202022350422.5U CN202022350422U CN213906859U CN 213906859 U CN213906859 U CN 213906859U CN 202022350422 U CN202022350422 U CN 202022350422U CN 213906859 U CN213906859 U CN 213906859U
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Abstract
A transistor capacitor microphone comprises a microphone, a phantom 48V power supply, a power supply circuit, an amplifying circuit and a polarization voltage circuit, wherein the amplifying circuit adopts a field effect transistor Q1 with high impedance input as an amplifier, constant current source circuits are formed by triodes Q6, Q7 and a resistor R10, and negative feedback networks of the amplifier are formed by the triodes Q1, Q2, Q3, Q4 and Q5, diodes D1 and D1A, a capacitor C1, C2 and C3, resistors R1, R2, R3, R5, R6, R7, R8 and the constant current source circuits. The utility model discloses effectively restrain the leakage current noise that the transistor produced because of ambient temperature's change, dynamic negative feedback network has guaranteed that signal amplification can not take place the distortion phenomenon in with the transmission, can in time stabilize offset voltage when mains voltage is unstable. The device has the advantages of simple structure, stable work, low cost, wide application range and the like, and has good market prospect.
Description
Technical Field
The utility model relates to a microphone for gathering sound specifically is a transistor capacitor microphone.
Background
The transistor capacitor microphone is designed by using the charge-discharge principle of capacitance between conductors, using ultrathin metal or gold-plated plastic film as the vibration film to sense sound pressure, changing the electrostatic voltage between conductors and directly converting the electrostatic voltage into electric energy signal, and obtaining practical output impedance and sensitivity through electronic circuit coupling. The specialized transistor capacitor microphone with patent number 201220449648.3, which is disclosed by the Chinese patent office in 2013, 03, 20 and comprises an electret sound head, a low-cut circuit, an attenuation circuit, an impedance conversion circuit and a protection circuit; the signal output end of the electret sound head is connected with the signal input end of the low-cut circuit, the signal output end of the low-cut circuit is connected with the signal input end of the attenuation circuit, the signal output end of the attenuation circuit is connected with the signal input end of the impedance transformation circuit, the signal output end of the impedance transformation circuit is connected with the signal input end of the protection circuit, and both the electret sound head and the impedance transformation circuit are powered by a 9V battery or a 48V phantom power supply. Such a transistor-capacitor microphone is prone to distortion during signal amplification and transmission.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a signal amplifier which can not generate distortion in signal amplification and transmission.
In order to realize the purpose, the utility model adopts the technical proposal that: the transistor capacitor microphone comprises a microphone, a phantom 48V power supply, a power supply circuit, an amplifying circuit and a polarization voltage circuit, wherein the amplifying circuit adopts a high-impedance input field-effect tube Q1 as an amplifier, a constant current source circuit is formed by triodes Q6, Q7 and a resistor R10, and a negative feedback network of the amplifier is formed by the triodes Q1, Q2, Q3, Q4 and Q5, diodes D1 and D1A, capacitors C1, C2 and C3, resistors R1, R2, R3, R5, R6, R7 and R8 and the constant current source circuit.
Clamping diodes D2 and D2A are arranged in the amplifying circuit, and sharp pulse interference caused by series connection of the output end of the amplifier is eliminated.
The amplifying circuit is provided with a capacitor C4 and a resistor R12 as an amplifier output resistance-capacitance coupling circuit, and a resistor R11 and a capacitor C5 form an RC filter circuit to provide a smooth direct-current power supply for the amplifier.
The power supply circuit comprises an XLR interface, a phantom 48V power supply supplies power to the microphone through the XLR interface, capacitors C6, C7 and C8 are power supply filter capacitors, a resistor R19 and a capacitor C9 short circuit signals of a pin 3 of the XLR interface to the ground, and only a pin 2 of the XLR interface outputs unbalanced signals.
The power supply circuit is provided with resistors R16 and R17 and is used for limiting the current of the microphone power supply.
The power supply circuit is provided with a power indicator lamp LED1-LED12, a current limiting resistor R14 and a change-over switch K1.
The polarization voltage circuit comprises a pulse generating circuit and a voltage doubling rectifying circuit and is used for providing polarization voltage for the capacitance sound head; the polarization voltage circuit consists of a chip U1, resistors R20 and R21 and a capacitor C11, and the voltage doubling rectifying circuit consists of diodes D4, D4A, D5, D5A, D6 and D6A, and capacitors C13, C14, C15 and C16.
The polarization voltage circuit comprises filter capacitors C18 and C19.
The utility model discloses effectively restrain the leakage current noise that the transistor produced because of ambient temperature's change, dynamic negative feedback network has guaranteed that signal amplification can not take place the distortion phenomenon in with the transmission, can in time stabilize offset voltage when mains voltage is unstable. The device has the advantages of simple structure, stable work, low cost, wide application range and the like, and has good market prospect.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is an amplifying circuit diagram of the present invention.
Fig. 3 is a power supply circuit diagram of the present invention.
Fig. 4 is a polarization voltage circuit diagram of the present invention.
Detailed Description
As shown in fig. 1, the utility model relates to a transistor capacitor microphone, it includes microphone, illusion 48V power, supply circuit, amplifier circuit and polarization voltage circuit, and microphone pickup part uses big vibrating diaphragm gilding sound head.
As shown in fig. 2, the amplifier circuit adopts a high impedance input field effect transistor Q1 as an amplifier, a constant current source circuit is composed of transistors Q6, Q7 and a resistor R10, and a negative feedback network of the amplifier is composed of transistors Q1, Q2, Q3, Q4, Q5, diodes D1, D1A, capacitors C1, C2, C3, resistors R1, R2, R3, R5, R6, R7, R8 and the constant current source circuit. The negative feedback network ensures that no distortion phenomenon occurs in signal amplification and transmission, so that the amplifier can stably work for a long time. Clamping diodes D2 and D2A are arranged in the amplifying circuit, and sharp pulse interference caused by series connection of the output end of the amplifier is eliminated. The amplifying circuit is provided with a capacitor C4 and a resistor R12 as an amplifier output resistance-capacitance coupling circuit, and a resistor R11 and a capacitor C5 form an RC filter circuit to provide a smooth direct-current power supply for the amplifier.
As shown in fig. 3, the power supply circuit includes an XLR interface, a phantom 48V power supply supplies power to the microphone through the XLR interface, capacitors C6, C7 and C8 are power filter capacitors, a resistor R19 and a capacitor C9 short-circuit a 3-pin signal of the XLR interface to ground, and only a 2-pin signal of the XLR interface outputs an unbalanced signal. The power supply circuit is provided with resistors R16 and R17, so that the current of the microphone power supply is limited, and the power supply is prevented from being damaged due to microphone power failure. The power supply circuit is provided with a power indicator lamp LED1-LED12, a current limiting resistor R14 and a change-over switch K1. The power indicator LED1-LED12 has red and blue colors and can be switched by a switch K1.
As shown in fig. 4, the polarization voltage circuit includes a pulse generating circuit and a voltage doubling rectifying circuit, and provides a polarization voltage for the capacitance sound head; the polarization voltage circuit consists of a chip U1, resistors R20 and R21 and a capacitor C11, and the voltage doubling rectifying circuit consists of diodes D4, D4A, D5, D5A, D6 and D6A, and capacitors C13, C14, C15 and C16. The polarization voltage circuit comprises filter capacitors C18 and C19.
The utility model discloses effectively restrain the leakage current noise that the transistor produced because of ambient temperature's change, dynamic negative feedback network has guaranteed that signal amplification can not take place the distortion phenomenon in with the transmission, can in time stabilize offset voltage when mains voltage is unstable. The device has the advantages of simple structure, stable work, low cost, wide application range and the like, and has good market prospect.
Claims (8)
1. A transistor capacitor microphone comprises a microphone, a phantom 48V power supply, a power supply circuit, an amplifying circuit and a polarization voltage circuit, and is characterized in that the amplifying circuit adopts a high-impedance input field effect transistor Q1 as an amplifier, a constant current source circuit is formed by transistors Q6, Q7 and a resistor R10, and a negative feedback network of the amplifier is formed by the transistors Q1, Q2, Q3, Q4, Q5, diodes D1 and D1A, capacitors C1, C2 and C3, resistors R1, R2, R3, R5, R6, R7, R8 and the constant current source circuit.
2. The transistor-capacitor microphone as claimed in claim 1, wherein the amplifier circuit is provided with clamping diodes D2, D2A to eliminate glitches at the output of the amplifier due to series connection.
3. The transistor-capacitor microphone as claimed in claim 1, wherein the amplifying circuit is provided with a capacitor C4 and a resistor R12 to form an amplifier output RC coupling circuit, and a resistor R11 and a capacitor C5 to form an RC filter circuit to provide a smooth dc power to the amplifier.
4. A transistor-capacitor microphone according to any of claims 1-3, wherein the power supply circuit comprises an XLR interface, the phantom 48V power supply supplies power to the microphone through the XLR interface, the capacitors C6, C7 and C8 are power filter capacitors, the resistor R19 and the capacitor C9 short-circuit the 3-pin signal of the XLR interface to ground, and only the 2-pin of the XLR interface outputs unbalanced signals.
5. The transistor-capacitor microphone of claim 4, wherein the power supply circuit includes resistors R16 and R17 for limiting current to the microphone power supply.
6. The transistor-capacitor microphone as claimed in claim 4, wherein the power supply circuit is provided with a power indicator LED1-LED12, a current limiting resistor R14 and a switch K1.
7. A transistor-capacitor microphone according to any of claims 1-3, wherein the polarization voltage circuit comprises a pulse generating circuit and a voltage doubling rectifying circuit for supplying a polarization voltage to the capacitor head; the polarization voltage circuit consists of a chip U1, resistors R20 and R21 and a capacitor C11, and the voltage doubling rectifying circuit consists of diodes D4, D4A, D5, D5A, D6 and D6A, and capacitors C13, C14, C15 and C16.
8. The transistor-capacitor microphone of claim 7, wherein the polarization voltage circuit comprises filter capacitors C18, C19.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022350422.5U CN213906859U (en) | 2020-10-21 | 2020-10-21 | Transistor capacitor microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022350422.5U CN213906859U (en) | 2020-10-21 | 2020-10-21 | Transistor capacitor microphone |
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| Publication Number | Publication Date |
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| CN213906859U true CN213906859U (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022350422.5U Active CN213906859U (en) | 2020-10-21 | 2020-10-21 | Transistor capacitor microphone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115459803A (en) * | 2022-08-30 | 2022-12-09 | 陕西烽火电子股份有限公司 | Nationwide voice self-adaptive circuit design |
-
2020
- 2020-10-21 CN CN202022350422.5U patent/CN213906859U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115459803A (en) * | 2022-08-30 | 2022-12-09 | 陕西烽火电子股份有限公司 | Nationwide voice self-adaptive circuit design |
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