CN216217561U - Test microphone power supply system - Google Patents
Test microphone power supply system Download PDFInfo
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- CN216217561U CN216217561U CN202122422124.7U CN202122422124U CN216217561U CN 216217561 U CN216217561 U CN 216217561U CN 202122422124 U CN202122422124 U CN 202122422124U CN 216217561 U CN216217561 U CN 216217561U
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Abstract
The utility model discloses a power supply system for testing a microphone, which can set different voltages and cannot cause the output of the power supply system to vibrate and burn out the microphone. The technical problem to be solved by the utility model is realized by the following technical means: the utility model provides a test microphone power supply system, includes MCU the control unit, DAC module, ADC module and power amplifier, the DAC module with the ADC module equally divide do not with the MCU the control unit electricity is connected, power amplifier's first input with the output of DAC module is connected, power amplifier's output is connected with the electric capacity, the electric capacity electricity is connected with sampling resistor R, sampling resistor R connects ADC module and microphone. The utility model relates to the technical field of microphone testing.
Description
Technical Field
The utility model relates to the technical field of microphone testing, in particular to a power supply system for testing a microphone.
Background
There are two main ways to power a microphone at present: 1. using the LDO or the DC-DC to provide a fixed voltage for supplying power to the microphone; 2. the DAC is matched with the power operational amplifier to achieve adjustable voltage to supply power to the microphone, and the voltage can be changed according to the requirement of the microphone. The use of LDO or DC-DC can only provide one fixed voltage, but the microphone may require different voltages due to power consumption requirements, which is not practical. Different voltages can be set through the DAC and the power operational amplifier, but the capacity of the power operational amplifier for driving the capacitive load is poor, and decoupling capacitors are mostly placed beside circuits of the microphone, so that the output of a power supply system is vibrated sometimes, and the microphone is burnt out.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a power supply system for a test microphone, which can set different voltages and cannot cause the output of the power supply system to vibrate and burn out the microphone.
The technical problem to be solved by the utility model is realized by the following technical means: the utility model provides a test microphone power supply system, includes MCU the control unit, DAC module, ADC module and power amplifier, the DAC module with the ADC module equally divide do not with the MCU the control unit electricity is connected, power amplifier's first input with the output of DAC module is connected, power amplifier's output is connected with the electric capacity, the electric capacity electricity is connected with sampling resistor R, sampling resistor R connects ADC module and microphone.
Further, the second input end of the power amplifier is electrically connected with the first resistor R1The first resistor R1The second input end of the power amplifier is electrically connected with the capacitor, and a second resistor R is connected between the ADC module and the microphone2。
Furthermore, the power supply system for the test microphone further comprises a computer, the computer is provided with a USB interface, the MCU control unit is electrically connected with the UART module, a USB to UART module is arranged between the UART module and the USB interface, and the USB interface is connected with the USB to UART module through a USB line.
Further, the output voltage signal range of the DAC module is 0-5V.
The utility model has the beneficial effects that: any voltage in a certain range can be set through the DAC module, and the power supply requirement of the microphone commonly used in the current situation is met. The power amplifier is subjected to capacitance compensation, so that the power amplifier has a filtering effect, the power amplifier output is more stable, the ripple waves are smaller, and the sound quality output by the microphone is better.
Drawings
Fig. 1 is a circuit schematic of the present invention.
Wherein, USB: universal Serial Bus, a communications protocol; USB to UART: converting the USB signal into a UART signal; UART: universal Asynchronous Receiver/Transmitter, Universal Asynchronous Receiver/Transmitter (a communication protocol); MCU: microprogrammed Control Unit, microcontroller; ADC: analog Digital converter, converting Analog signal into Digital signal and sending to MCU for processing; DAC: digital Analog converter, converting Digital signals into Analog output; c: a capacitor for compensating feedback; AMP: a power amplifier for converting the low power signal into a signal capable of driving high power; MicPPhone: microphone, the equipment that converts the sound signal into analog electric signal.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the present invention is a power supply system for testing a microphone, including an MCU control unit 1, a DAC module 2, an ADC module 3, and a power amplifier 4, where the DAC module 2 and the ADC module 3 are both electrically connected to the MCU control unit 1, a first input end of the power amplifier 4 is connected to an output end of the DAC module 2, an output end of the power amplifier 4 is connected to a capacitor 5, the capacitor 5 is electrically connected to a sampling resistor R6, and the sampling resistor R6 is connected to the ADC module 3 and the microphone 7. The sampling resistor R6 is connected to the ADC module 3 and is used to collect the operating current of the microphone 7 and calculate its power consumption.
Further, a second one of the power amplifiers 4The input end is electrically connected with a first resistor R18, the first resistor R18 is grounded, a second input end of the power amplifier 4 is electrically connected with the capacitor 5, and a second resistor R is connected between the ADC module 3 and the microphone 729. A first resistor R18 and a second resistor R2And 9 is an amplification calculation resistor for amplification setting.
Further, the power supply system for the test microphone further comprises a computer 10, the computer 10 is provided with a USB interface, the MCU control unit 1 is electrically connected with the UART module 11, the UART module 11 is connected with the USB interface through a USB to UART module 12, and the USB interface is connected with the USB to UART module 12 through a USB cable 13.
Further, the output voltage signal range of the DAC module 2 is 0-5V. Any voltage in the range of 0-5V can be set through the DAC, and the power supply requirement of the existing common microphone is met
The utility model is designed based on STM32 MCU as the main control, USB is simulated into a serial port by a USB to UART and a USB-to-serial port chip, and the serial port can be identified by a computer through the USB. The computer sends the instruction for setting the voltage to the serial port, and the MCU receives the instruction through the serial port. The MCU outputs the digital signal as the desired analog voltage through the DAC module after analyzing the instruction. The voltage output by the MCU is output to the microphone for use after being gained by the power amplifier. The capacitor provides compensation feedback for the operational amplifier, and power supply oscillation is prevented.
The utility model has the beneficial effects that: any voltage in the range of 0-5V can be set through the DAC module, and the power supply requirement of the microphone which is commonly used at present is met. The power amplifier is subjected to capacitance compensation, so that the power amplifier has a filtering effect, the power amplifier output is more stable, the ripple waves are smaller, and the sound quality output by the microphone is better.
Claims (4)
1. The utility model provides a test microphone power supply system, its characterized in that, includes MCU the control unit (1), DAC module (2), ADC module (3) and power amplifier (4), DAC module (2) with ADC module (3) equally divide respectively with MCU the control unit (1) electricity is connected, the first input of power amplifier (4) with the output of DAC module (2) is connected, the output of power amplifier (4) is connected with electric capacity (5), electric capacity (5) electricity is connected with sampling resistor R (6), sampling resistor R (6) are connected ADC module (3) and microphone (7).
2. Test microphone supply system according to claim 1, characterized in that the second input of the power amplifier (4) is electrically connected to a first resistor R1(8) The first resistor R1(8) The second input end of the power amplifier (4) is electrically connected with the capacitor (5), and a second resistor R is connected between the ADC module (3) and the microphone (7)2(9)。
3. The power supply system for the test microphone according to claim 1, further comprising a computer (10), wherein the computer (10) is provided with a USB interface, the MCU control unit (1) is electrically connected to a UART module (11), a USB to UART module (12) is provided between the UART module (11) and the USB interface, and the USB interface and the USB to UART module (12) are connected by a USB cable (13).
4. Test microphone supply system according to claim 1, characterized in that the output voltage signal of the DAC module (2) is in the range of 0-5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122422124.7U CN216217561U (en) | 2021-10-09 | 2021-10-09 | Test microphone power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122422124.7U CN216217561U (en) | 2021-10-09 | 2021-10-09 | Test microphone power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216217561U true CN216217561U (en) | 2022-04-05 |
Family
ID=80861891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122422124.7U Active CN216217561U (en) | 2021-10-09 | 2021-10-09 | Test microphone power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216217561U (en) |
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2021
- 2021-10-09 CN CN202122422124.7U patent/CN216217561U/en active Active
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