CN204014033U - A kind of computer wireless microphone circuit - Google Patents
A kind of computer wireless microphone circuit Download PDFInfo
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- CN204014033U CN204014033U CN201420452472.6U CN201420452472U CN204014033U CN 204014033 U CN204014033 U CN 204014033U CN 201420452472 U CN201420452472 U CN 201420452472U CN 204014033 U CN204014033 U CN 204014033U
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Abstract
A kind of computer wireless microphone circuit described in the utility model, comprise power circuit, audio frequency processing circuit, pickup circuit, audio amplifier circuit, audio frequency oscillating circuit, pulse-frequency modulation circuit and signal transmission circuit, the output of described power circuit is connected with the power input of described audio frequency processing circuit, the one stage signal input of described audio frequency processing circuit is connected with the output of described audio pickup circuit, the one stage signal output of audio frequency processing circuit is connected with the input of described audio amplifier circuit, the output of described audio amplifier circuit is connected with the secondary input of described audio frequency processing circuit through audio frequency oscillating circuit, the second signal output passages through which vital energy circulates of described audio frequency processing circuit reconstitutes frequency circuit and is connected with the input of described signal transmission circuit.This circuit has advantages of simple in structure, with low cost, and especially acoustical quality has advantages of high-fidelity, is conducive to universal and promotes.
Description
Technical field
The utility model relates to wireless microphone technical field, is specifically related to a kind of computer wireless microphone circuit.
Background technology
Microphone, formal name used at school is microphone, is the energy conversion device that voice signal is converted to the signal of telecommunication, is translated by Microphone.Also claim microphone, microphone.Twentieth century, by changing by resistance at first, acoustic-electric develops into inductance to microphone, condenser type is changed, a large amount of new microphone techniques grow up gradually, and this is comprising the microphone such as aluminium strip, moving-coil, and current widely used capacitance microphone and electret microphone.In prior art, microphone applications can realize a lot of functions to computer, but what mostly all adopt now is wire microphone, computer is wiring trouble in the time connecting wired microphone, and be also subject in the use the restriction of stube cable, although there are a lot of wireless microphones,, mostly complex structure, cost is high, audio is poor, be difficult to popularize, therefore, have room for improvement.
Utility model content
The technical problems to be solved in the utility model is to provide that a kind of circuit is simple, cost is low, the good computer wireless microphone circuit of audio.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of computer wireless microphone circuit, comprise power circuit, audio frequency processing circuit, pickup circuit, audio amplifier circuit, audio frequency oscillating circuit, pulse-frequency modulation circuit and signal transmission circuit, the output of described power circuit is connected with the power input of described audio frequency processing circuit, the one stage signal input of described audio frequency processing circuit is connected with the output of described audio pickup circuit, the one stage signal output of audio frequency processing circuit is connected with the input of described audio amplifier circuit, the output of described audio amplifier circuit is connected with the secondary input of described audio frequency processing circuit through audio frequency oscillating circuit, the second signal output passages through which vital energy circulates of described audio frequency processing circuit reconstitutes frequency circuit and is connected with the input of described signal transmission circuit.
Described pickup circuit is made up of multiple electric capacity, two resistance and microphone; Described audio frequency processing circuit has f-m stereo sound chip, one end of described microphone is connected with the left channel signals input of f-m stereo sound chip by the first electric capacity, second electric capacity of two serial connections, the other end of described microphone is connected with the right-channel signals input of f-m stereo sound chip with the 4th electric capacity by the 3rd electric capacity successively, described the first resistance is connected in parallel on the two ends of the first electric capacity, and described the second resistance is connected in parallel on the two ends of the 3rd electric capacity.
Described audio amplifier circuit is made up of field effect transistor, voltage stabilizing didoe, light-emitting diode and the 5th electric capacity, and described audio frequency oscillating circuit is made up of two diodes, inductance and resistance, and described power circuit has battery and resistance; The source electrode of described field effect transistor is connected with the anode of light-emitting diode, the negative electrode of light-emitting diode is connected with the positive pole of battery, the drain electrode of field effect transistor is connected with the negative pole of battery by resistance, the grid of field effect transistor is connected with the negative electrode of light-emitting diode by the 5th electric capacity, the anode of described voltage stabilizing didoe is connected with the negative electrode of light-emitting diode, and the negative electrode of voltage stabilizing didoe is connected with the grid of field effect transistor; The negative pole of described the first diode is connected with the grid of field effect transistor, its positive pole is connected with the anode of voltage stabilizing didoe by inductance, the negative pole of described the second diode is connected with the grid of field effect transistor, its positive pole is connected with the anode of voltage stabilizing didoe, and described the 3rd resistance is connected in parallel on the two ends of voltage stabilizing didoe.
In described audio frequency processing circuit, adopting model is the f-m stereo sound chip of BA1404.
The beneficial effects of the utility model are: the utility model is a kind of computer wireless microphone, adopt audio frequency processing, audio frequency amplification, audio oscillation, pulse-frequency modulation circuit and radiating circuit composition, have advantages of simple in structure, with low cost, especially acoustical quality has advantages of high-fidelity, is conducive to universal and promotes.
Brief description of the drawings
Fig. 1 is circuit structure theory diagram of the present utility model;
Fig. 2 is circuit structure schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model will be further described.
A kind of computer wireless microphone circuit, as shown in Figure 1, comprise power circuit 1, audio frequency processing circuit 2, pickup circuit 3, audio amplifier circuit 4, audio frequency oscillating circuit 5, pulse-frequency modulation circuit 6 and signal transmission circuit 7, the output of power circuit 1 is connected with the power input of audio frequency processing circuit 2, the one stage signal input of audio frequency processing circuit 2 is connected with the output of audio pickup circuit 3, the one stage signal output of audio frequency processing circuit 2 is connected with the input of audio amplifier circuit 4, the output of audio amplifier circuit 4 is connected with the secondary input of audio frequency processing circuit 2 through audio frequency oscillating circuit 5, the second signal output passages through which vital energy circulates of audio frequency processing circuit 2 reconstitutes frequency circuit 6 and is connected with the input of described signal transmission circuit 7.
As shown in Figure 2, wherein pickup circuit 3 is by four capacitor C 2, C3, C4, C5, two resistance R 3, R4, and microphone MIC forms; Audio frequency processing circuit 2 has FM multiplex chip IC, one end of microphone MIC is connected with the left channel signals input of FM multiplex chip IC by the first capacitor C 2, second capacitor C 3 of two serial connections, the other end of microphone MIC is connected with the right-channel signals input of FM multiplex chip IC with the 4th capacitor C 5 by the 3rd capacitor C 4 successively, the first resistance R 3 is connected in parallel on the two ends of the first capacitor C 2, and the second resistance R 4 is connected in parallel on the two ends of the 3rd capacitor C 4.
Audio amplifier circuit 4 is mainly made up of field effect transistor VT, voltage stabilizing didoe DW, LED and the 5th capacitor C 1, described audio frequency oscillating circuit 5 is mainly made up of two diode VD1, VD2, inductance L 1 and resistance R 2, and power circuit 1 has battery E and resistance R 1; The source electrode of field effect transistor VT is connected with the anode of LED, the negative electrode of LED is connected with the positive pole of battery E, the drain electrode of field effect transistor VT is connected with the negative pole of battery E by resistance R 1, the grid of field effect transistor VT is connected with the negative electrode of LED by the 5th capacitor C 1, the anode of voltage stabilizing didoe DW is connected with the negative electrode of LED, and the negative electrode of voltage stabilizing didoe DW is connected with the grid of field effect transistor VT; The negative pole of the first diode VD1 is connected with the grid of field effect transistor VT, its anodal inductance L 1 of passing through is connected with the anode of voltage stabilizing didoe DW, the negative pole of the second diode VD2 is connected with the grid of field effect transistor VT, its positive pole is connected with the anode of voltage stabilizing didoe DW, and the 3rd resistance R 2 is connected in parallel on the two ends of voltage stabilizing didoe DW.
In audio frequency processing circuit 2, adopting model is the f-m stereo sound chip of BA1404.
Operation principle of the present utility model is as follows:
The first inductance L 1 and the second inductance L 2 are the enamelled wire of wire diameter 0.3mm, around 5 circles, and internal coil diameter 3mm, the coil of long 8mm coiling, tranmitting frequency is about 100MHz.For make circuit simply not increase too many cost as far as possible, electronic switch is to be served as by field effect transistor VT.Because the required driving power of field effect transistor VT is minimum, substantially do not want drive current.Absorb by inductance L 1 energy that is created in computer electromagnetic field around, through utmost point pipe VD1 and VD2 voltage multiplying rectifier, in capacitor C 1, accumulate certain electric weight, in the time that voltage is progressively brought up to the cut-in voltage of field effect transistor VT, field effect transistor VT conducting, power supply E energising resistance R1 and field effect transistor VT are the utility model power supply.
The above is preferably execution mode of the utility model, is not limited to the utility model, all amendments of making in technical scope of the present utility model, improves or is equal to replacement etc., all should be included in the scope that the utility model protects.
Claims (4)
1. a computer wireless microphone circuit, it is characterized in that: comprise power circuit (1), audio frequency processing circuit (2), pickup circuit (3), audio amplifier circuit (4), audio frequency oscillating circuit (5), pulse-frequency modulation circuit (6) and signal transmission circuit (7), the output of described power circuit (1) is connected with the power input of described audio frequency processing circuit (2), the one stage signal input of described audio frequency processing circuit (2) is connected with the output of described audio pickup circuit (3), the one stage signal output of audio frequency processing circuit (2) is connected with the input of described audio amplifier circuit (4), the output of described audio amplifier circuit (4) is connected with the secondary input of described audio frequency processing circuit (2) through audio frequency oscillating circuit (5), the second signal output passages through which vital energy circulates of described audio frequency processing circuit (2) reconstitutes frequency circuit (6) and is connected with the input of described signal transmission circuit (7).
2. a kind of computer wireless microphone circuit according to claim 1, is characterized in that: described pickup circuit is made up of multiple electric capacity (C2, C3, C4, C5), two resistance (R3, R4) and microphone (MIC), described audio frequency processing circuit (2) has f-m stereo sound chip (IC), one end of described microphone (MIC) is by first electric capacity (C2) of two serial connections, the second electric capacity (C3) is connected with the left channel signals input of f-m stereo sound chip (IC), the other end of described microphone (MIC) is connected with the right-channel signals input of f-m stereo sound chip (IC) with the 4th electric capacity (C5) by the 3rd electric capacity (C4) successively, described the first resistance (R3) is connected in parallel on the two ends of the first electric capacity (C2), described the second resistance (R4) is connected in parallel on the two ends of the 3rd electric capacity (C4).
3. a kind of computer wireless microphone circuit according to claim 1, it is characterized in that: described audio amplifier circuit is mainly made up of field effect transistor (VT), voltage stabilizing didoe (DW), light-emitting diode (LED) and the 5th electric capacity (C1), described audio frequency oscillating circuit (4) is mainly made up of two diodes (VD1, VD2), inductance (L1) and resistance (R2), and described power circuit (1) has battery (E) and resistance (R1); The source electrode of described field effect transistor (VT) is connected with the anode of light-emitting diode (LED), the negative electrode of light-emitting diode (LED) is connected with the positive pole of battery (E), the drain electrode of field effect transistor (VT) is connected with the negative pole of battery (E) by resistance (R1), the grid of field effect transistor (VT) is connected with the negative electrode of light-emitting diode (LED) by the 5th electric capacity (C1), the anode of described voltage stabilizing didoe (DW) is connected with the negative electrode of light-emitting diode (LED), and the negative electrode of voltage stabilizing didoe (DW) is connected with the grid of field effect transistor (VT); The negative pole of described the first diode (VD1) is connected with the grid of field effect transistor (VT), its anodal inductance (L1) that passes through is connected with the anode of voltage stabilizing didoe (DW), the negative pole of described the second diode (VD2) is connected with the grid of field effect transistor (VT), its positive pole is connected with the anode of voltage stabilizing didoe (DW), and described the 3rd resistance (R2) is connected in parallel on the two ends of voltage stabilizing didoe (DW).
4. according to a kind of computer wireless microphone circuit described in any one in claim 1-3, it is characterized in that: in described audio frequency processing circuit, adopting model is the f-m stereo sound chip of BA1404.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420452472.6U CN204014033U (en) | 2014-08-12 | 2014-08-12 | A kind of computer wireless microphone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420452472.6U CN204014033U (en) | 2014-08-12 | 2014-08-12 | A kind of computer wireless microphone circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204014033U true CN204014033U (en) | 2014-12-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420452472.6U Expired - Fee Related CN204014033U (en) | 2014-08-12 | 2014-08-12 | A kind of computer wireless microphone circuit |
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| Country | Link |
|---|---|
| CN (1) | CN204014033U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106101930A (en) * | 2016-07-05 | 2016-11-09 | 太仓怡泰霖智能科技有限公司 | There is network savvy and the multi-functional audio circuit of external source of sound broadcasting can be carried out |
-
2014
- 2014-08-12 CN CN201420452472.6U patent/CN204014033U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106101930A (en) * | 2016-07-05 | 2016-11-09 | 太仓怡泰霖智能科技有限公司 | There is network savvy and the multi-functional audio circuit of external source of sound broadcasting can be carried out |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20180812 |