CN202043264U - Frequency modulation wireless microphone circuit with voltage stabilizing circuit - Google Patents
Frequency modulation wireless microphone circuit with voltage stabilizing circuit Download PDFInfo
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- CN202043264U CN202043264U CN2011201294057U CN201120129405U CN202043264U CN 202043264 U CN202043264 U CN 202043264U CN 2011201294057 U CN2011201294057 U CN 2011201294057U CN 201120129405 U CN201120129405 U CN 201120129405U CN 202043264 U CN202043264 U CN 202043264U
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- triode
- capacitor
- voltage stabilizing
- frequency modulation
- wireless microphone
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Abstract
The utility model provides a frequency modulation wireless microphone with a voltage stabilizing circuit, and particularly relates to a frequency modulation wireless microphone circuit with a voltage stabilizing circuit, which comprises an audio magnifying part, a high-frequency oscillation part and a voltage stabilizing part, wherein a signal is injected into the base electrode of a first triode VT1 from the MIC (microphone) and is amplified by the first triode VT1 to become an audio signal; the audio signal is coupled with the base electrode of a second triode VT2 through a capacitor C2 and then is emitted out through an antenna; and the voltage stabilizing part adopts a three-terminal regulator. The frequency modulation wireless microphone circuit has 200m effective emission distance for the information, and has the characteristics of effectively reduced signal noise and distortion, simple structure and low cost.
Description
Technical field
The utility model belongs to communication technical field, relates to the wireless microphone technology, relates in particular to a kind of frequency modulation wireless microphone circuit with voltage stabilizing circuit.
Background technology
Wireless microphone, be (can be contained in the pocket by some pocket transmitters, the about 0.01W of power output) and a concentrated receiver form, every pocket transmitter has a mutually different operating frequency, and concentrated receiver can receive the voice signal of the different operating frequency that the pocket transmitter of each sends simultaneously.It is adapted to occasions such as stage dais.
Present wireless microphone, transmitting range is short, and stability is relatively poor, and especially under distance situation far away slightly, performance is poorer.More existing high-performance wireless microphones generally adopt high-end chip, and it is expensive, are difficult to promote.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the purpose of this utility model is to provide a kind of frequency modulation wireless microphone circuit with voltage stabilizing circuit, and its effective transmitting range can reach 200m, effectively reduce signal noise simultaneously, reduce distortion, had characteristics simple in structure, with low cost.
In order to achieve the above object, the technical solution adopted in the utility model is:
The frequency modulation wireless microphone circuit of band voltage stabilizing circuit comprises
The audio frequency amplifier section, connect first capacitor C 1 between the base stage of the output of microphone MIC and the first triode VT1, the base stage of the first triode VT1 is connected second resistance R 2 with inter-collector, the grounded emitter of the first triode VT1, collector electrode is connected to the voltage output end of three terminal regulator U1 after by the 3rd resistance R 3, and the output of microphone MIC is connected to the voltage output end of three terminal regulator U1 after by first resistance R 1;
The high frequency oscillation part, be connected second capacitor C 2 between the base stage of the collector electrode of the first triode VT1 and the second triode VT2, the base stage of the second triode VT2 is received the voltage output end of three terminal regulator U1 after by the 4th resistance R 4, the base stage of the second triode VT2 is by the 3rd capacitor C 3 back ground connection, the 4th capacitor C 4 of the connection parallel connection of the second triode VT2 and first inductance L 1, the voltage output end of another termination three terminal regulator U1 of the 4th capacitor C 4 and first inductance L 1, the emitter of the second triode VT2 connects the 5th capacitor C 5 and second inductance L 2 in parallel, the other end ground connection of the 5th capacitor C 5 and second inductance L 2 also is connected with the 6th capacitor C 6 between the collector and emitter of the second triode VT2;
The voltage stabilizing part connects the 7th capacitor C 7 between the voltage output end of three terminal regulator U1 and the GND, connect the 8th capacitor C 8 between voltage input end and the GND.
The described first triode VT1 is the 9013H triode, and three terminal regulator U1 is LM7806.
The described second triode VT2 is 2N3866 triode or 34D50 triode.
The utility model compared with prior art has the following advantages:
1) stable performance, signal noise is low;
2) transmitting range is far away, can reach more than the 200m;
3) simple in structure, with low cost.
Description of drawings
Accompanying drawing is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further details.
As shown in Figure 1, the utility model comprises for the frequency modulation wireless microphone circuit of band voltage stabilizing circuit
The audio frequency amplifier section, connect first capacitor C 1 between the base stage of the output of microphone MIC and the first triode VT1, the base stage of the first triode VT1 is connected second resistance R 2 with inter-collector, the grounded emitter of the first triode VT1, collector electrode is connected to the voltage output end of three terminal regulator U1 after by the 3rd resistance R 3, and the output of microphone MIC is connected to the voltage output end of three terminal regulator U1 after by first resistance R 1;
The high frequency oscillation part, be connected second capacitor C 2 between the base stage of the collector electrode of the first triode VT1 and the second triode VT2, the base stage of the second triode VT2 is received the voltage output end of three terminal regulator U1 after by the 4th resistance R 4, the base stage of the second triode VT2 is by the 3rd capacitor C 3 back ground connection, the 4th capacitor C 4 of the connection parallel connection of the second triode VT2 and first inductance L 1, the voltage output end of another termination three terminal regulator U1 of the 4th capacitor C 4 and first inductance L 1, the emitter of the second triode VT2 connects the 5th capacitor C 5 and second inductance L 2 in parallel, the other end ground connection of the 5th capacitor C 5 and second inductance L 2 also is connected with the 6th capacitor C 6 between the collector and emitter of the second triode VT2;
The voltage stabilizing part connects the 7th capacitor C 7 between the voltage output end of three terminal regulator U1 and the GND, connect the 8th capacitor C 8 between voltage input end and the GND.
Wherein, the first triode VT1 adopts the 9013H triode, and three terminal regulator U1 is LM7806, and the second triode VT2 is the 2N3866 triode, and microphone MIC selects Electret condenser microphone for use, and its sensitivity is very high.
During work, signal injects the base stage of the first triode VT1 by microphone MIC, and the audio signal after the first triode VT1 amplifies is coupled to the second triode VT2 base stage through second capacitor C 2, launches through antenna then.The operating frequency of this circuit is between 85～104MHz.
This circuit structure is simple, is convenient to assembling, after the assembling, turns on the FM broadcast receiver, regulate station selector, if what receive is milky harmonic wave, available bottle opener is regulated the spacing of oscillator coil L1, frequency raise when the L1 spacing was big, otherwise then reduced, and can receive the sound of not being with harmonic wave.
The type selecting of the second triode VT2 can change, and for example, selects the 34D50 triode, and corresponding adjustment resistance value just can make transmitting range further increase simultaneously.
Claims (5)
1. the frequency modulation wireless microphone circuit of band voltage stabilizing circuit comprises
The audio frequency amplifier section, connect first capacitor C 1 between the base stage of the output of microphone MIC and the first triode VT1, the base stage of the first triode VT1 is connected second resistance R 2 with inter-collector, the grounded emitter of the first triode VT1, collector electrode is connected to the voltage output end of three terminal regulator U1 after by the 3rd resistance R 3, and the output of microphone MIC is connected to the voltage output end of three terminal regulator U1 after by first resistance R 1;
The high frequency oscillation part, be connected second capacitor C 2 between the base stage of the collector electrode of the first triode VT1 and the second triode VT2, the base stage of the second triode VT2 is received the voltage output end of three terminal regulator U1 after by the 4th resistance R 4, the base stage of the second triode VT2 is by the 3rd capacitor C 3 back ground connection, the 4th capacitor C 4 of the connection parallel connection of the second triode VT2 and first inductance L 1, the voltage output end of another termination three terminal regulator U1 of the 4th capacitor C 4 and first inductance L 1, the emitter of the second triode VT2 connects the 5th capacitor C 5 and second inductance L 2 in parallel, the other end ground connection of the 5th capacitor C 5 and second inductance L 2 also is connected with the 6th capacitor C 6 between the collector and emitter of the second triode VT2;
It is characterized in that, also comprise
The voltage stabilizing part connects the 7th capacitor C 7 between the voltage output end of three terminal regulator U1 and the GND, connect the 8th capacitor C 8 between voltage input end and the GND.
2. the frequency modulation wireless microphone circuit of band voltage stabilizing circuit according to claim 1 is characterized in that, the described first triode VT1 is the 9013H triode.
3. the frequency modulation wireless microphone circuit of band voltage stabilizing circuit according to claim 1 is characterized in that, the described second triode VT2 is the 2N3866 triode.
4. the frequency modulation wireless microphone circuit of band voltage stabilizing circuit according to claim 1 is characterized in that, the described second triode VT2 is the 34D50 triode.
5. the frequency modulation wireless microphone circuit of band voltage stabilizing circuit according to claim 1 is characterized in that described three terminal regulator U1 is LM7806.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201294057U CN202043264U (en) | 2011-04-27 | 2011-04-27 | Frequency modulation wireless microphone circuit with voltage stabilizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201294057U CN202043264U (en) | 2011-04-27 | 2011-04-27 | Frequency modulation wireless microphone circuit with voltage stabilizing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202043264U true CN202043264U (en) | 2011-11-16 |
Family
ID=44970689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201294057U Expired - Fee Related CN202043264U (en) | 2011-04-27 | 2011-04-27 | Frequency modulation wireless microphone circuit with voltage stabilizing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202043264U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932711A (en) * | 2012-10-23 | 2013-02-13 | 成都众询科技有限公司 | Wireless microphone signal transmitting circuit |
-
2011
- 2011-04-27 CN CN2011201294057U patent/CN202043264U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932711A (en) * | 2012-10-23 | 2013-02-13 | 成都众询科技有限公司 | Wireless microphone signal transmitting circuit |
| CN102932711B (en) * | 2012-10-23 | 2014-12-10 | 成都众询科技有限公司 | Wireless microphone signal transmitting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: He Guiying Document name: Notification of Termination of Patent Right |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111116 Termination date: 20120427 |