CN103037295A - High-performance amplitude modulation wireless microphone - Google Patents
High-performance amplitude modulation wireless microphone Download PDFInfo
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- CN103037295A CN103037295A CN 201210567535 CN201210567535A CN103037295A CN 103037295 A CN103037295 A CN 103037295A CN 201210567535 CN201210567535 CN 201210567535 CN 201210567535 A CN201210567535 A CN 201210567535A CN 103037295 A CN103037295 A CN 103037295A
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Abstract
The invention provides a high-performance amplitude modulation wireless microphone. The high-performance amplitude modulation wireless microphone is characterized by comprising a direct current power supply of 9V, a pickup circuit, a first level audio amplifier circuit, a second level audio amplifier circuit, and an amplitude wave modulation and transmission circuit. Amplitude modulation radios are in a largest amount owned by people among radios, and therefore convenience is brought for popularizing and using an amplitude modulation wave wireless microphone. An oscillator in the circuit of the high-performance amplitude modulation wireless microphone is good in modulation characteristics, and capable of generating amplitude-modulated signals centralized in frequency, and the generated amplitude-modulated signals are higher in fidelity than radio signals modulated in other methods. The high-performance amplitude modulation wireless microphone is capable of playing a significant role in occasions, such as a conference, music teaching and the like, changes a sound signal into an amplitude modulation wireless radio signal and outputs the amplitude modulation wireless radio signal. When the signal is received by a normal amplitude modulation radio, the amplitude modulation wave is reverted to the sound signal and is played. The high-performance amplitude modulation wireless microphone is stable in oscillation frequency and not prone to running frequency, the transmitting radius of the high-performance amplitude modulation wireless microphone is larger than 11m, and the high-performance amplitude modulation wireless microphone is in no need of an external antenna when used.
Description
Technical field
The invention 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 very large convenience is provided.It is good that oscillator in the circuit of the present invention has modulating characteristic, can produce the amplitude-modulated signal that frequency ratio is concentrated, and such signal wants nice and high many than the radio signal fidelity that modulates with 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, again amplitude-modulated wave is reduced into voice signal and plays back.Frequency of oscillation of the present invention is stable to be difficult for running frequency, emission radius greater than 11m.This modulation wireless microphone need not external antenna, greatly facilitates routine use.
Below describe high-performance modulation wireless microphone of the present invention related correlation technique content in implementation process in detail.
Summary of the invention
Goal of the invention and beneficial effect: what existing socially owning amount was maximum is amplitude-modulation receiver, and this provides very large convenience to promoting the use of amplitude-modulated wave wireless microphone.It is good that oscillator in the circuit of the present invention has modulating characteristic, can produce the amplitude-modulated signal that frequency ratio is concentrated, and such signal is more much higher than the radio signal fidelity that modulates with 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, again amplitude-modulated wave is reduced into voice signal and plays back.Frequency of oscillation of the present invention is stable to be difficult for running frequency, emission radius greater than 11m, near the broadcast receiver can not disturbing, and this wireless microphone need not external antenna in use.
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 among the Electret condenser microphone MIC connects an end of capacitor C 1, and the metal shell of Electret condenser microphone MIC links to each other with field effect transistor source S and circuit ground GND among the 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 links to each other 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 with voice signal, and the audio signal of exporting from Electret condenser microphone MIC directly promotes NPN type triode VT1.The emitter of NPN type triode VT2 is connected to negative feedback loop in audio amplifier circuit, and NPN type triode VT2 also is the part as current source circuit.VT3 forms radio-frequency oscillator by NPN type triode, and this radio-frequency oscillator has many advantages, and higher-order of oscillation coil L1 no longer needs tap, so that circuit production is simple, debugging is convenient.
Description of drawings
Accompanying drawing 1 is the embodiment circuit working schematic diagram that the invention provides a high-performance modulation wireless microphone.
Embodiment
According to circuit working schematic diagram and the description of drawings of high-performance modulation wireless microphone shown in the accompanying drawing 1, and implement to realize the present invention 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 links to each other 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 that rheum officinale is-58dB Lan Sewei-54dB, white is greater than-52dB, and 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; Electrochemical capacitor C3 with capacity 47 μ F, withstand voltage be 16V; The ceramic disc capacitor of capacitor C 4 usefulness 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 at the ferrite bar of long 60mm, ￠ 5mm, the spacing of the higher-order of oscillation coil L1 turn-to-turn in the Circuit tuning can be finely tuned higher-order of oscillation frequency;
2. band switch is placed the AM wave band, modulation wireless microphone is near amplitude-modulation receiver, then slow tuning wireless knob, simultaneously Electret condenser microphone MIC is talked, be tuned to broadcast receiver can receive till 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 simultaneously variable capacitance CP, the frequency of careful tuning amplitude-modulation receiver again is until receive that in a certain frequency modulation wireless microphone sends clearly voice signal;
3. pull open gradually the distance between amplitude-modulated wave wireless microphone and the amplitude-modulation receiver, until distance is when meeting or exceeding 11m, still can receive clearly till the 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. 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 among the Electret condenser microphone MIC connects an end of capacitor C 1, and the metal shell of Electret condenser microphone MIC links to each other with field effect transistor source S and circuit ground GND among the 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 links to each other 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 201210567535 CN103037295A (en) | 2012-12-25 | 2012-12-25 | High-performance amplitude modulation wireless microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210567535 CN103037295A (en) | 2012-12-25 | 2012-12-25 | High-performance amplitude modulation wireless microphone |
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| Publication Number | Publication Date |
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| CN103037295A true CN103037295A (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201210567535 Withdrawn CN103037295A (en) | 2012-12-25 | 2012-12-25 | High-performance amplitude modulation wireless microphone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115277329A (en) * | 2022-06-14 | 2022-11-01 | 中南民族大学 | AM (amplitude modulation) system and method for field effect transistor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115277329A (en) * | 2022-06-14 | 2022-11-01 | 中南民族大学 | AM (amplitude modulation) system and method for field effect transistor |
| CN115277329B (en) * | 2022-06-14 | 2024-04-16 | 中南民族大学 | Field effect transistor AM amplitude modulation system and method thereof |
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Application publication date: 20130410 |