CN202957973U - High-performance amplitude-modulation wireless microphone - Google Patents
High-performance amplitude-modulation wireless microphone Download PDFInfo
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- CN202957973U CN202957973U CN 201220721403 CN201220721403U CN202957973U CN 202957973 U CN202957973 U CN 202957973U CN 201220721403 CN201220721403 CN 201220721403 CN 201220721403 U CN201220721403 U CN 201220721403U CN 202957973 U CN202957973 U CN 202957973U
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Abstract
The utility model provides a high-performance amplitude-modulation (AM) wireless microphone, which is technically characterized by comprising a 9V DC power supply, a pick-up circuit, a primary audio amplifying circuit, a secondary audio amplifying circuit, and an amplitude-modulated wave oscillation and transmitting circuit. In current society, AM radio owners are the largest in number, thereby providing great convenience for the popularization and application of AM wireless microphones. According to the technical scheme of the utility model, oscillators adopted in the above circuits of the AM wireless microphone are good in modulation property, so that AM signals with relatively concentrated frequencies can be generated by the AM wireless microphone. In this way, signals obtained by means of the above oscillators are much higher in signal fidelity than wireless electrical signals modulated by other methods. The AM wireless microphone plays a great role in meetings, music teaching and other occasions, wherein acoustical signals are converted into AM wireless electrical signals to be sent out. Then the AM wireless electrical signals are received by a general AM radio and amplitude-modulated waves are reverted into acoustical signals to be played. The oscillation frequency of the high-performance AM wireless microphone is stable and the frequency swing phenomenon does not easily occur. The transmitting radius of the high-performance AM wireless microphone is larger than 11 meters. Therefore, no external antenna is needed during the application of the wireless microphone.
Description
Technical field
The utility model belongs to electronic technology and radio communication technology field, is about a kind of high-performance modulation wireless microphone.
Background technology
The circuit of frequency modulation type wireless microphone is a lot, and the upper owning amount of society maximum be amplitude-modulation receiver, this gives and promotes the use of amplitude-modulated wave wireless microphone and provide a great convenience.It is good that oscillator in the utility model circuit has modulating characteristic, can produce the more concentrated amplitude-modulated signal of frequency ratio, and such signal wants nice and high many than the radio signal fidelity modulated by other method.
Amplitude-modulated wave wireless microphone can be brought into play great role on the occasions such as meeting, music teaching.It becomes the am radio signal to voice signal and emits, and after being received by the ordinary amplitude modulation broadcast receiver, then amplitude-modulated wave is reduced into to voice signal plays back.The stable difficult race frequency of the utility model frequency of oscillation, emission radius are greater than 11m.This modulation wireless microphone, without external antenna, greatly facilitates routine use.
Below describe high-performance modulation wireless microphone described in the utility model related correlation technique content in implementation process in detail.
The utility model content
Goal of the invention and beneficial effect: what existing owning amount socially was maximum is amplitude-modulation receiver, and this provides a great convenience to promoting the use of amplitude-modulated wave wireless microphone.It is good that oscillator in the utility model circuit has modulating characteristic, can produce the more concentrated amplitude-modulated signal of frequency ratio, and such signal is more much higher than the radio signal fidelity modulated by other method.
Amplitude-modulated wave wireless microphone can be brought into play great role on the occasions such as meeting, music teaching.It becomes the am radio signal to voice signal and emits, and after being received by the ordinary amplitude modulation broadcast receiver, then amplitude-modulated wave is reduced into to voice signal plays back.The stable difficult race frequency of the utility model frequency of oscillation, emission radius are greater than 11m, near the broadcast receiver can not disturbing, and this wireless microphone is in use without external antenna.
Technical characterictic: the high-performance modulation wireless microphone, it comprises 9V DC power supply, pickup circuit, one-level audio amplifier circuit, secondary audio amplifier circuit, amplitude-modulated wave vibration and radiating circuit, it is characterized in that:
The pickup circuit: it is comprised of Electret condenser microphone MIC and capacitor C 1, and the field effect transistor drain D in Electret condenser microphone MIC connects an end of capacitor C 1, and the metal shell of Electret condenser microphone MIC is connected with field effect transistor source S and circuit ground GND in Electret condenser microphone MIC;
The one-level audio amplifier circuit: it is comprised of NPN type triode VT1, resistance R 1, resistance R 2, electrochemical capacitor C3, the base stage of NPN type triode VT1 connects the other end of capacitor C 1, the end of the collector electrode connecting resistance R1 of NPN type triode VT1 and an end of capacitor C 2, another termination 9V DC power anode VCC of resistance R 1, the end of the emitter connecting resistance R2 of NPN type triode VT1 and the positive pole of electrochemical capacitor C3, the negative pole connection circuit ground GND of the other end of resistance R 2 and electrochemical capacitor C3;
The secondary audio amplifier circuit: it is comprised of NPN type triode VT2, resistance R 3, resistance R 4, resistance R 5, the base stage of NPN type triode VT2 connects the other end of capacitor C 2, an end of resistance R 3 and an end of resistance R 4, another termination 9V DC power anode VCC of resistance R 3, the other end connection circuit ground GND of resistance R 4, the emitter of NPN type triode VT2 is by resistance R 5 connection circuit ground GND;
Amplitude-modulated wave vibration and radiating circuit: it is by NPN type triode VT3, resistance R 6, resistance R 7 and capacitor C 4, variable capacitance CP and higher-order of oscillation coil L1 form, the end of the base stage connecting resistance R6 of NPN type triode VT3, one end of resistance R 7 and an end of capacitor C 4, another termination 9V DC power anode VCC of resistance R 6, the other end of the other end of resistance R 7 and capacitor C 4 is connected with circuit ground GND, the collector electrode of NPN type triode VT3 connects the end of variable capacitance CP and the end of higher-order of oscillation coil L1, another termination 9V DC power anode VCC of the other end of variable capacitance CP and higher-order of oscillation coil L1, the emitter of NPN type triode VT3 connects the collector electrode of NPN type triode VT2.
The circuit working principle: Electret condenser microphone MIC is transformed into tone currents by voice signal, from the audio signal of Electret condenser microphone MIC output, directly promotes NPN type triode VT1.In audio amplifier circuit, the emitter of NPN type triode VT2 is connected to negative feedback loop, and NPN type triode VT2 is also the part as current source circuit.By NPN type triode, VT3 forms radio-frequency oscillator, and this radio-frequency oscillator has many advantages, and higher-order of oscillation coil L1 no longer needs tap, makes that circuit production is simple, debugging is convenient.
The accompanying drawing explanation
Accompanying drawing 1 is the embodiment circuit working schematic diagram that the utility model provides a high-performance modulation wireless microphone.
Embodiment
According to circuit working schematic diagram and the accompanying drawing explanation of high-performance modulation wireless microphone shown in accompanying drawing 1, and implement to realize the utility model according to the described components and parts specification requirement of embodiment.
The selection of components and parts and technical parameter thereof
MIC is Electret condenser microphone, Electret condenser microphone MIC should select the microphone of two ends output type, be conducive to improve voltage gain and the anti-interference of output signal, wherein the drain D of field effect transistor is audio signal output end, connection circuit ground GND after the metal shell of Electret condenser microphone is connected with the source S of field effect transistor, higher its effect of Electret condenser microphone sensitivity is better, can select CM-18W type Electret condenser microphone MIC, its sensitivity is divided into five gears: redness is-66dB, Xiao Huang is-62dB, rheum officinale is-58dB, blue look is-54dB, be greater than-52dB of white, the present embodiment is selected the white point product,
VT1 is NPN type triode, selects model 2SC9014, requires β >=150; VT2 and VT3 are NPN type triode, and the model of selecting is 8050, require β >=110;
The resistance of resistance R 1 is 3.9K Ω; The resistance of resistance R 2 is 2K Ω; Resistance R 3 resistances are 39K Ω; The resistance of resistance R 4 is 8.2K Ω; The resistance of resistance R 5 is 3K Ω; The resistance of resistance R 6 is 18K Ω; The resistance of resistance R 7 is 15K Ω; The resistance of variable resistor RP is 1M Ω;
The capacity of capacitor C 1～C2 is 0.22 μ F; Capacity 47 μ F for electrochemical capacitor C3, withstand voltage be 16V; The ceramic disc capacitor of capacitor C 4 use 100PF; Range of capacity 150～300PF of variable capacitance CP;
The power consumption of 9V DC power supply is a milliampere level, therefore can select the 9V laminated cell.
Circuit production main points and circuit debugging method
1. higher-order of oscillation coil L1: select No. 32 enamelled wires of international standard, flat around 40 circles on the ferrite bar of long 60mm, ￠ 5mm, the spacing of the higher-order of oscillation coil L1 turn-to-turn in Circuit tuning can be finely tuned higher-order of oscillation frequency;
2. band switch is placed in to the AM wave band, modulation wireless microphone is near amplitude-modulation receiver, then slow tuning wireless knob, Electret condenser microphone MIC is talked simultaneously, be tuned to till broadcast receiver can receive the spoken sounds signal sound, if amplitude-modulation receiver can not receive the signal of modulation wireless microphone emission in all band scope, can be by stretching or compression higher-order of oscillation coil L1, change the turn-to-turn spacing of higher-order of oscillation coil L1, adjust variable capacitance CP simultaneously, the frequency of careful tuning amplitude-modulation receiver again, until receive that on a certain frequency modulation wireless microphone sends voice signal clearly,
3. pull open gradually the distance between amplitude-modulated wave wireless microphone and amplitude-modulation receiver, until distance is while meeting or exceeding 11m, still, till receiving clearly voice signal, when debugging modulation wireless microphone tranmitting frequency, should be noted that the frequency of avoiding local AM band broadcasting station;
4. this modulation wireless microphone quiescent current≤4mA, the operating current of emission state general≤15mA.
Claims (1)
1. a high-performance modulation wireless microphone, it comprises 9V DC power supply, pickup circuit, one-level audio amplifier circuit, secondary audio amplifier circuit, amplitude-modulated wave vibration and radiating circuit, it is characterized in that:
Described pickup circuit is comprised of Electret condenser microphone MIC and capacitor C 1, and the field effect transistor drain D in Electret condenser microphone MIC connects an end of capacitor C 1, and the metal shell of Electret condenser microphone MIC is connected with field effect transistor source S and circuit ground GND in Electret condenser microphone MIC;
Described one-level audio amplifier circuit is comprised of NPN type triode VT1, resistance R 1, resistance R 2, electrochemical capacitor C3, the base stage of NPN type triode VT1 connects the other end of capacitor C 1, the end of the collector electrode connecting resistance R1 of NPN type triode VT1 and an end of capacitor C 2, another termination 9V DC power anode VCC of resistance R 1, the end of the emitter connecting resistance R2 of NPN type triode VT1 and the positive pole of electrochemical capacitor C3, the negative pole connection circuit ground GND of the other end of resistance R 2 and electrochemical capacitor C3;
Described secondary audio amplifier circuit is comprised of NPN type triode VT2, resistance R 3, resistance R 4, resistance R 5, the base stage of NPN type triode VT2 connects the other end of capacitor C 2, an end of resistance R 3 and an end of resistance R 4, another termination 9V DC power anode VCC of resistance R 3, the other end connection circuit ground GND of resistance R 4, the emitter of NPN type triode VT2 is by resistance R 5 connection circuit ground GND;
Described amplitude-modulated wave vibration and radiating circuit are by NPN type triode VT3, resistance R 6, resistance R 7 and capacitor C 4, variable capacitance CP and higher-order of oscillation coil L1 form, the end of the base stage connecting resistance R6 of NPN type triode VT3, one end of resistance R 7 and an end of capacitor C 4, another termination 9V DC power anode VCC of resistance R 6, the other end of the other end of resistance R 7 and capacitor C 4 is connected with circuit ground GND, the collector electrode of NPN type triode VT3 connects the end of variable capacitance CP and the end of higher-order of oscillation coil L1, another termination 9V DC power anode VCC of the other end of variable capacitance CP and higher-order of oscillation coil L1, the emitter of NPN type triode VT3 connects the collector electrode of NPN type triode VT2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220721403 CN202957973U (en) | 2012-12-25 | 2012-12-25 | High-performance amplitude-modulation wireless microphone |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220721403 CN202957973U (en) | 2012-12-25 | 2012-12-25 | High-performance amplitude-modulation wireless microphone |
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| CN202957973U true CN202957973U (en) | 2013-05-29 |
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| CN 201220721403 Expired - Fee Related CN202957973U (en) | 2012-12-25 | 2012-12-25 | High-performance amplitude-modulation wireless microphone |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9225527B1 (en) | 2014-08-29 | 2015-12-29 | Coban Technologies, Inc. | Hidden plug-in storage drive for data integrity |
| US9307317B2 (en) | 2014-08-29 | 2016-04-05 | Coban Technologies, Inc. | Wireless programmable microphone apparatus and system for integrated surveillance system devices |
| US10152859B2 (en) | 2016-05-09 | 2018-12-11 | Coban Technologies, Inc. | Systems, apparatuses and methods for multiplexing and synchronizing audio recordings |
| US10165171B2 (en) | 2016-01-22 | 2018-12-25 | Coban Technologies, Inc. | Systems, apparatuses, and methods for controlling audiovisual apparatuses |
| US10370102B2 (en) | 2016-05-09 | 2019-08-06 | Coban Technologies, Inc. | Systems, apparatuses and methods for unmanned aerial vehicle |
| US10789840B2 (en) | 2016-05-09 | 2020-09-29 | Coban Technologies, Inc. | Systems, apparatuses and methods for detecting driving behavior and triggering actions based on detected driving behavior |
-
2012
- 2012-12-25 CN CN 201220721403 patent/CN202957973U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9225527B1 (en) | 2014-08-29 | 2015-12-29 | Coban Technologies, Inc. | Hidden plug-in storage drive for data integrity |
| US9307317B2 (en) | 2014-08-29 | 2016-04-05 | Coban Technologies, Inc. | Wireless programmable microphone apparatus and system for integrated surveillance system devices |
| US10165171B2 (en) | 2016-01-22 | 2018-12-25 | Coban Technologies, Inc. | Systems, apparatuses, and methods for controlling audiovisual apparatuses |
| US10152859B2 (en) | 2016-05-09 | 2018-12-11 | Coban Technologies, Inc. | Systems, apparatuses and methods for multiplexing and synchronizing audio recordings |
| US10152858B2 (en) | 2016-05-09 | 2018-12-11 | Coban Technologies, Inc. | Systems, apparatuses and methods for triggering actions based on data capture and characterization |
| US10370102B2 (en) | 2016-05-09 | 2019-08-06 | Coban Technologies, Inc. | Systems, apparatuses and methods for unmanned aerial vehicle |
| US10789840B2 (en) | 2016-05-09 | 2020-09-29 | Coban Technologies, Inc. | Systems, apparatuses and methods for detecting driving behavior and triggering actions based on detected driving behavior |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130529 Termination date: 20131225 |