CN104754479A - Wireless microphone for office meetings - Google Patents
Wireless microphone for office meetings Download PDFInfo
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- CN104754479A CN104754479A CN201310756351.0A CN201310756351A CN104754479A CN 104754479 A CN104754479 A CN 104754479A CN 201310756351 A CN201310756351 A CN 201310756351A CN 104754479 A CN104754479 A CN 104754479A
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Abstract
The invention discloses a wireless microphone for office meetings. The wireless microphone for office meetings comprises a power source, a switch, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an electret microphone, a first audion, a second audion, an adjusting inductor and an antenna. The first audion plays a role of audio amplification, the second audio plays a role of high-frequency oscillation, the electret microphone converts speaking voice of a user into audio electrical signals, and the audio electric signals are audio-amplified by the first audion and regulated into high-frequency oscillating signals through the second audio, the adjustable inductor transmits frequency-regulated electromagnetic waves outwards. According to the wireless microphone for office meetings, the first audio plays the role of audio amplification, the second audion plays the role of high-frequency oscillation, and the adjustable end of the adjustable inductor is connected with the emitting antenna through the seventh capacitor, so that the emitting effects can be enhanced. The wireless microphone for office meetings has the advantages of being simple in structure, small in size and convenient to carry.
Description
Technical field
The present invention relates to a kind of pocket wireless microphone, particularly relate to a kind of wireless microphone for office meeting.
Background technology
Wireless microphone is widely used in every field, it is mathematical that wireless microphone acts in the acoustic system, because it has the maneuverability not needing cable, have again the high-quality electroacoustic performance of cable microphone concurrently, be widely used in television stadio, film instant report, theatrical art public address and exhibition explanation, in all kinds of office meeting, as scheme explanation, company's regular meeting, wireless microphone is all one of indispensable office equipment, and the wireless microphone being conventionally used to office meeting exists the problem of complex structure, volume very much not Portable belt and launching effect difference.
Summary of the invention
Object of the present invention is just to provide a kind of wireless microphone for office meeting to solve the problem.
In order to achieve the above object, present invention employs following technical scheme:
For a wireless microphone for office meeting, comprise power supply, switch, first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity, 5th electric capacity, 6th electric capacity, 7th electric capacity, Electret condenser microphone, first triode, second triode, controllable impedance and antenna, the positive pole of described power supply is connected with the first end of described switch, the negative pole of described power supply respectively with the first end of described first resistance, the first end of described Electret condenser microphone, the emitter of described first triode, the first end of described 4th electric capacity is connected with the first end of described 6th resistance, the second end of described switch respectively with the first end of described first electric capacity, the first end of described second resistance, the first end of described 4th resistance, the first end of described 5th resistance, the first end of described 5th electric capacity is connected with the first end of described controllable impedance, second end of described first electric capacity is connected with the second end of described first resistance, second end of described second resistance is connected with the second end of described Electret condenser microphone and the first end of described second electric capacity respectively, second end of described second electric capacity is connected with the base stage of described first triode and the first end of described 3rd resistance respectively, the second end of described 3rd resistance respectively with the second end of described 4th resistance, the first end of described 3rd electric capacity is connected with the collector electrode of described first triode, the second end of described 3rd electric capacity respectively with the second end of described 5th resistance, the base stage of described second triode is connected with the second end of described 4th electric capacity, the collector electrode of described second triode respectively with the second end of described 5th electric capacity, second end of described controllable impedance is connected with the first end of described 6th electric capacity, second end of described 6th electric capacity is connected with the second end of described 6th resistance and the emitter of described second triode respectively, the adjustable end of described controllable impedance is connected with the first end of described 7th electric capacity, and described second end of the 7th electric capacity is connected with the signal transmitting terminal of described antenna.
Beneficial effect of the present invention is:
The present invention is a kind of wireless microphone for office meeting, in this wireless microphone, audio frequency amplification served as by the first triode, higher-order of oscillation effect served as by second triode, the adjustable end of controllable impedance connects transmitting antenna by the 7th electric capacity, can strengthen launching effect, this wireless microphone also has the simple and little portable feature of volume of structure.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of wireless microphone for office meeting of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, a kind of wireless microphone for office meeting of the present invention, comprises power supply E, switch S, first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, 4th electric capacity C4, 5th electric capacity C5, 6th electric capacity C6, 7th electric capacity C7, Electret condenser microphone MIC, first triode VT1, second triode VT2, controllable impedance LP and antenna Y, the positive pole of power supply E is connected with the first end of switch S, the negative pole of power supply E respectively with the first end of the first resistance R1, the first end of Electret condenser microphone MIC, the emitter of the first triode VT1, the first end of the 4th electric capacity C4 is connected with the first end of the 6th resistance R6, the second end of switch S respectively with the first end of the first electric capacity C1, the first end of the second resistance R2, the first end of the 4th resistance R4, the first end of the 5th resistance R5, the first end of the 5th electric capacity C5 is connected with the first end of controllable impedance LP, second end of the first electric capacity C1 is connected with second end of the first resistance R1, second end of the second resistance R2 is connected with second end of Electret condenser microphone MIC and the first end of the second electric capacity C2 respectively, second end of the second electric capacity C2 is connected with the base stage of the first triode VT1 and the first end of the 3rd resistance R3 respectively, second end of the 3rd resistance R3 respectively with second end of the 4th resistance R4, the first end of the 3rd electric capacity C3 is connected with the collector electrode of the first triode VT1, second end of the 3rd electric capacity C3 respectively with second end of the 5th resistance R5, the base stage of the second triode VT2 is connected with second end of the 4th electric capacity C4, the collector electrode of the second triode VT2 respectively with second end of the 5th electric capacity C5, second end of controllable impedance LP is connected with the first end of the 6th electric capacity C6, second end of the 6th electric capacity C6 is connected with second end of the 6th resistance R6 and the emitter of the second triode VT2 respectively, the adjustable end of controllable impedance LP is connected with the first end of the 7th electric capacity C7, and second end of the 7th electric capacity C7 is connected with the signal transmitting terminal of antenna Y.
Operation principle of the present invention is as follows:
First triode VT1 serves as audio frequency and amplifies, second triode VT2 serves as the higher-order of oscillation, after people's voice is become audio electrical signal by Electret condenser microphone MIC, deliver to the first triode VT1 through the second electric capacity C2 and carry out audio frequency amplification, audio signal after amplification is coupled to after the second triode VT2 through the 3rd C3, be modulated into high-frequency oscillation signal, 6th electric capacity C6 is the be junction capacitance of the second triode VT2, 6th electric capacity C6 is changed with the change of audio signal voltage, so controllable impedance LP externally launches FM electromagnetic ripple, the adjustable end of controllable impedance LP connects transmitting antenna Y by the 7th electric capacity C7, launching effect can be strengthened.
Technical scheme of the present invention is not limited to the restriction of above-mentioned specific embodiment, the technology distortion that every technical scheme according to the present invention is made, and all falls within protection scope of the present invention.
Claims (1)
1. for a wireless microphone for office meeting, it is characterized in that: comprise power supply, switch, first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity, 5th electric capacity, 6th electric capacity, 7th electric capacity, Electret condenser microphone, first triode, second triode, controllable impedance and antenna, the positive pole of described power supply is connected with the first end of described switch, the negative pole of described power supply respectively with the first end of described first resistance, the first end of described Electret condenser microphone, the emitter of described first triode, the first end of described 4th electric capacity is connected with the first end of described 6th resistance, the second end of described switch respectively with the first end of described first electric capacity, the first end of described second resistance, the first end of described 4th resistance, the first end of described 5th resistance, the first end of described 5th electric capacity is connected with the first end of described controllable impedance, second end of described first electric capacity is connected with the second end of described first resistance, second end of described second resistance is connected with the second end of described Electret condenser microphone and the first end of described second electric capacity respectively, second end of described second electric capacity is connected with the base stage of described first triode and the first end of described 3rd resistance respectively, the second end of described 3rd resistance respectively with the second end of described 4th resistance, the first end of described 3rd electric capacity is connected with the collector electrode of described first triode, the second end of described 3rd electric capacity respectively with the second end of described 5th resistance, the base stage of described second triode is connected with the second end of described 4th electric capacity, the collector electrode of described second triode respectively with the second end of described 5th electric capacity, second end of described controllable impedance is connected with the first end of described 6th electric capacity, second end of described 6th electric capacity is connected with the second end of described 6th resistance and the emitter of described second triode respectively, the adjustable end of described controllable impedance is connected with the first end of described 7th electric capacity, and described second end of the 7th electric capacity is connected with the signal transmitting terminal of described antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310756351.0A CN104754479A (en) | 2013-12-30 | 2013-12-30 | Wireless microphone for office meetings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310756351.0A CN104754479A (en) | 2013-12-30 | 2013-12-30 | Wireless microphone for office meetings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104754479A true CN104754479A (en) | 2015-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310756351.0A Pending CN104754479A (en) | 2013-12-30 | 2013-12-30 | Wireless microphone for office meetings |
Country Status (1)
| Country | Link |
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| CN (1) | CN104754479A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788492A (en) * | 2016-12-21 | 2017-05-31 | 龙立钦 | A kind of radio frequency modulation device |
| CN113890572A (en) * | 2021-11-17 | 2022-01-04 | 郑州西亚斯学院 | High-performance Bluetooth communication circuit |
-
2013
- 2013-12-30 CN CN201310756351.0A patent/CN104754479A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788492A (en) * | 2016-12-21 | 2017-05-31 | 龙立钦 | A kind of radio frequency modulation device |
| CN113890572A (en) * | 2021-11-17 | 2022-01-04 | 郑州西亚斯学院 | High-performance Bluetooth communication circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150701 |
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| WD01 | Invention patent application deemed withdrawn after publication |