CN105979435A - High sensitivity wireless monitor - Google Patents
High sensitivity wireless monitor Download PDFInfo
- Publication number
- CN105979435A CN105979435A CN201610388791.9A CN201610388791A CN105979435A CN 105979435 A CN105979435 A CN 105979435A CN 201610388791 A CN201610388791 A CN 201610388791A CN 105979435 A CN105979435 A CN 105979435A
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- China
- Prior art keywords
- resistance
- electric capacity
- circuit portion
- circuit part
- electrical connection
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a high sensitivity wireless monitor, comprising a microphone, a first stage amplification circuit part, a second grade amplification circuit part, a high frequency emission circuit part and a power supply circuit part; an acoustical signal is converted to a voltage signal by the microphone; the first stage amplification circuit performs first time amplification on the voltage signal generated by the microphone; a second stage amplification circuit performs second time amplification on the voltage signal generated by the first stage amplification circuit; and an oscillation circuit part converts the voltage signal generated by the second amplification circuit to a radio frequency signal and emits the radio frequency signal to the surrounding; frequency of a monitoring emitter is in a range of 88-108MHZ; a monitoring range is within 100m; and the high sensitivity wireless monitor can monitor weak acoustical signals indoor and outdoor.
Description
Technical field
The present invention relates to a kind of audiomonitor, particularly relate to the highly sensitive radio monitor that a kind of partition wall uses.
Background technology
Owing to arresting the needs of offender, the monitoring to offender becomes a detecting being highly desirable to
Means.Existing audiomonitor volume is the hugest, causes adaptable scope extensive not, and uses
Precision is the highest, and use cost is too high, it is impossible to meet present demand.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of highly sensitive radio monitor, and its volume is little, Gao Ling
Quick, production cost is low, and range is extensive.
Be the technical scheme is that by solving above-mentioned technical problem
Highly sensitive radio monitor, including microphone, first order amplifying circuit portion, amplifying circuit portion, the second level,
High frequency transmission circuit portion and power circuit part, acoustical signal is converted into the signal of telecommunication by described microphone, and described first
The signal of telecommunication that described microphone is produced by level amplifying circuit portion carries out amplifying for the first time, described second level amplifying circuit
The signal of telecommunication that described first order amplifying circuit portion produces is carried out second time and amplifies by portion, and described oscillating circuit portion will
The signal of telecommunication that amplifying circuit portion, the described second level produces is converted into radiofrequency signal and launches to surrounding space.
Described microphone is Electret condenser microphone.
Described first order amplifying circuit portion include integrated operational amplifier, the first resistance, the second resistance, the 3rd
Resistance, the 4th resistance, the 5th resistance, the first electric capacity and the second electric capacity, the of described integrated operational amplifier
One in-phase input end is electric with one end of described second electric capacity, one end of described second resistance and the described 3rd respectively
One end electrical connection of resistance, the other end of described second electric capacity and the other end of described 3rd resistance and described power supply
The negative voltage side electrical connection of circuit part, described second resistance electrically connects the positive voltage terminal of described power circuit part,
First inverting input of described integrated operational amplifier respectively with one end of described 4th resistance, the described 5th
One end electrical connection of resistance, the other end of described 4th resistance electrically connects with one end of described first electric capacity, institute
The other end stating the first electric capacity electrically connects with one end, the described microphone of described first resistance respectively, and described first
Another termination positive source of resistance, the first outfan of described integrated operational amplifier is electrically connected described
The other end of the 5th resistance, one end of described 3rd electric capacity, the other end of described 3rd electric capacity and described current potential
One end of device connects, and the other end of described potentiometer electrically connects with the negative voltage side of power circuit end.
Amplifying circuit portion, the described second level include integrated operational amplifier, the second resistance, the 3rd resistance, the 6th
Resistance, the 7th resistance, the second electric capacity, the 4th electric capacity and potentiometer, the second of described integrated operational amplifier
In-phase input end respectively with one end of described second electric capacity, one end of described second resistance and described 3rd resistance
One end connect, the other end of described second electric capacity and the other end of described 3rd resistance and described power circuit
The negative voltage side electrical connection in portion, the other end of described second resistance is electric with the positive voltage terminal of described power circuit part
Connect, the first inverting input of described integrated operational amplifier respectively with one end, the institute of described 6th resistance
Stating one end electrical connection of the 7th resistance, the other end of described 6th resistance is electrically connected with one end of described 4th electric capacity
Connecing, the described other end of the 4th electric capacity electrically connects with one end of described potentiometer, the other end of described potentiometer
Electrically connect with the negative voltage side of described power circuit part, the second outfan of described integrated operational amplifier and institute
State the other end electrical connection of the 7th resistance.
Described high frequency transmission circuit portion include the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity,
Nine electric capacity, the 8th resistance, the 9th resistance, inductance and an audion, the second of described integrated operational amplifier
Outfan electrically connects one end of described 5th electric capacity, and the other end of described 5th electric capacity is electric with the described 6th respectively
The base stage electrical connection of the one end, one end of described 8th resistance and the described audion that hold, described 6th electric capacity
The other end electrically connects with the positive voltage terminal of described power circuit part with the described other end of the 8th resistance, and described three
The emitter stage of pole pipe is electric with one end of described 9th electric capacity, one end of described 9th resistance and the described 8th respectively
One end electrical connection held, the other end of described 9th electric capacity and the other end of described 9th resistance and described power supply
The negative voltage side electrical connection of circuit part, the colelctor electrode of described audion respectively with one end of described 7th electric capacity,
One end of described inductance, the other end of described 8th resistance and transmitting antenna electric connect, described 7th electric capacity
The other end of the other end and described inductance electrically connects with the positive voltage terminal of described power circuit part.
Described power circuit part include the tenth electric capacity, one switch and a power supply, the positive pole of described power supply respectively with
One end of described switch and one end electrical connection of described tenth electric capacity, the other end of described switch and the described tenth
Electric capacity the other end electrical connection, the other end of described switch as electrically connect described first order amplifying circuit portion,
Amplifying circuit portion, the second level, high frequency transmission circuit portion and the positive voltage terminal of described single-chip microcomputer, described power supply
Negative pole is as described first order amplifying circuit portion, amplifying circuit portion, the second level, high frequency transmission circuit portion and institute
State the negative voltage side of single-chip microcomputer.
The model of described integrated operational amplifier is LM324.
The Advantageous Effects that technique scheme is brought is:
Volume is little, easily installs and is discovered by offender；
Highly sensitive, faint acoustical signal can be detected；
Monitoring range is remote, can be by reception of wireless signals to acoustical signal in the range of 100m；
Production cost is low, therefore uses threshold relatively low.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of one embodiment of the invention；
Fig. 2 is the schematic diagram of the integrated operational amplifier LM324 of one embodiment of the invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to the present invention
Each embodiment be explained in detail.
Illustrating with reference to Fig. 1 referring generally to accompanying drawing and concrete, highly sensitive radio monitor, including staying
Electret microphone MIC, first order amplifying circuit portion, amplifying circuit portion, the second level, high frequency transmission circuit portion and
Power circuit part, acoustical signal is converted into the signal of telecommunication, first order amplifying circuit portion by Electret condenser microphone MIC
Carrying out the signal of telecommunication that Electret condenser microphone MIC produces amplifying for the first time, amplifying circuit portion, the second level is by first
The signal of telecommunication that level amplifying circuit portion produces carries out second time and amplifies, and oscillating circuit portion is by amplifying circuit portion, the second level
The signal of telecommunication produced is converted into radiofrequency signal and launches to surrounding space.
First in-phase input end 1IN+ of LM324 integrated operational amplifier respectively with the one of the second electric capacity C2
One end electrical connection of end, one end of the second resistance R2 and the 3rd resistance R3, the other end of the second electric capacity C2
It is connected with the negative electricity of battery BT with the other end of the 3rd resistance R3, the second resistance R2 electrical connection switch S
One end, switch S the other end be connected with the positive electrical of battery BT, LM324 integrated operational amplifier
The first inverting input 1IN-one end, one end of the 5th resistance R5 with the 4th resistance R4 respectively be electrically connected
Connect, one end electrical connection of the other end of the 4th resistance R4 and the first electric capacity C1, another of the first electric capacity C1
End electrically connects with one end, the Electret condenser microphone MIC of the first resistance R1 respectively, another of the first resistance R1
Holding the one end with switch S to electrically connect, the first outfan 1OUT of LM324 integrated operational amplifier is respectively
Electrically connect the other end of the 5th resistance R5, one end of the 3rd electric capacity C3, the other end of the 3rd electric capacity C3 with
One end of potentiometer RPA connects, and the other end of potentiometer RPA is connected with the negative electricity of battery BT,
Second in-phase input end 2IN+ of LM324 integrated operational amplifier and LM324 integrated operational amplifier
First in-phase input end 1IN+ electrical connection, the second inverting input 2IN-of LM324 integrated operational amplifier
Electrically connect with one end, one end of the 7th resistance R7 of the 6th resistance R6 respectively, another of the 6th resistance R6
End electrically connects with one end of the 4th electric capacity C4, the other end of the 4th electric capacity C4 and one end of potentiometer RPA
Electrical connection, the other end of potentiometer RPA is connected with the negative electricity of battery BT, and LM324 integrated computation is put
The other end electrical connection of the second outfan 2OUT and the 7th resistance R7 of big device.
One end of second outfan 2OUT electrical connection the 5th electric capacity C5 of LM324 integrated operational amplifier,
The other end of the 5th electric capacity C5 respectively with one end, one end of the 8th resistance R8 and three poles of the 6th electric capacity C6
The base stage electrical connection of pipe D-50, the other end of the 6th electric capacity C6 and the other end of the 8th resistance R8 and switch
One end electrical connection of S, the emitter stage of audion D-50 respectively with one end of the 9th electric capacity C9, the 9th electricity
One end of resistance R9 and one end electrical connection of the 8th electric capacity C8, the other end of the 9th electric capacity C9 and the 9th resistance
The other end of R9 is connected with the negative electricity of battery BT, the colelctor electrode of audion D-50 respectively with the 7th electric capacity
One end of C7, one end of inductance L, the other end of the 8th resistance R8 and transmitting antenna ANT electrical connection,
The other end of the 7th electric capacity C7 and the other end of inductance L electrically connect with one end of switch S, the tenth electric capacity
One end of C10 electrically connects with one end of switch S, the other end of the tenth electric capacity C10 and the negative pole of battery BT
Electrical connection.
See the four road operational amplifiers that Fig. 2, LM324 family device is low cost, there is real difference
Input.In single supply is applied, they have several obvious advantage compared with standard operational amplifier type.
This No. four amplifier can work the supply voltage of as little as 3.0V or up to 32V, and quiescent current is MC1741
About 1/5th (each amplifiers).Common-mode input range includes negative supply, therefore in numerous application
In without external bias components and parts.Output voltage range also includes negative supply voltage.
Circuit operation principle:
After Electret condenser microphone MIC detects faint sound signal, just produce signal voltage, warp at its two ends
Cross the first electric capacity C1 device to be coupled to the first in-phase input end 1IN+ of integrated computation circuit and be amplified, its
Gain amplifier reaches more than 20 decibels, after the first order is amplified, defeated from the first of integrated operational amplifier
Going out and hold 1OUT to export, couple through the 3rd electric capacity C3 device, potentiometer RPA controls to enter into integrated fortune
The the second inverting input 2IN-calculating amplifier carries out second level amplification, amplifies and the second level through the first order
After amplification, faint sound signal is put into enough amplitudes, is then coupled to audion by the 5th electric capacity C5
The base stage of D-50, is constituted high-frequency oscillating circuits, after voice modulation by audion D-50 and LC oscillating circuit
Carrier wave by launch antenna ANT to surrounding space launch, can be at 100m with a FM radio
Uppick in outer scope.5th resistance R5 and the 7th resistance R7 is the negative feedback of integrated operational amplifier
Resistance, adjusts its resistance and can change gain factor.Adjusting potentiometer RPA makes output signal strength moderate.
Adjusting inductance L and the 7th electric capacity C7 makes tranmitting frequency fall in the range of 88-108MHZ.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention not office
Being limited to this, any those familiar with the art, can be easily in the technical scope that the invention discloses
The change expected or replacement, all should contain within protection scope of the present invention.Therefore, the protection of the present invention
Scope should be as the criterion with scope of the claims.
Claims (7)
1. a highly sensitive radio monitor, it is characterised in that: include microphone, first order amplifying circuit portion,
Amplifying circuit portion, the second level, high frequency transmission circuit portion and power circuit part, acoustical signal is changed by described microphone
Becoming the signal of telecommunication, the signal of telecommunication that described microphone is produced by described first order amplifying circuit portion carries out amplifying for the first time,
The signal of telecommunication that described first order amplifying circuit portion produces is carried out second time and puts by amplifying circuit portion, the described second level
Greatly, described oscillating circuit portion the signal of telecommunication that amplifying circuit portion, the described second level produces is converted into radiofrequency signal to
Surrounding space is launched.
Highly sensitive radio monitor the most as claimed in claim 1, it is characterised in that: described microphone is for staying
Electret microphone.
Highly sensitive radio monitor the most as claimed in claim 1, it is characterised in that: the described first order is put
Big circuit part include integrated operational amplifier, the first resistance, the second resistance, the 3rd resistance, the 4th resistance,
5th resistance, the first electric capacity and the second electric capacity, the first in-phase input end of described integrated operational amplifier is respectively
Electrically connect with one end of one end of described second electric capacity, one end of described second resistance and described 3rd resistance,
The negative voltage of the other end of described second electric capacity and the other end of described 3rd resistance and described power circuit part
End electrical connection, described second resistance electrically connects the positive voltage terminal of described power circuit part, and described integrated computation is put
First inverting input of big device one end, one end of described 5th resistance with described 4th resistance respectively is electrically connected
Connecing, the other end of described 4th resistance electrically connects with one end of described first electric capacity, described first electric capacity another
One end electrically connects with one end, the described microphone of described first resistance respectively, another termination of described first resistance
Positive source, the first outfan of described integrated operational amplifier is electrically connected another of described 5th resistance
End, one end of described 3rd electric capacity, the described other end of the 3rd electric capacity is connected with one end of described potentiometer,
The other end of described potentiometer electrically connects with the negative voltage side of power circuit end.
Highly sensitive radio monitor the most as claimed in claim 1, it is characterised in that: the described second level is put
Big circuit part include integrated operational amplifier, the second resistance, the 3rd resistance, the 6th resistance, the 7th resistance,
Second electric capacity, the 4th electric capacity and potentiometer, the second in-phase input end of described integrated operational amplifier respectively with
One end of one end of described second electric capacity, one end of described second resistance and described 3rd resistance connects, described
The other end of the second electric capacity and the other end of described 3rd resistance are electric with the negative voltage side of described power circuit part
Connecting, the other end of described second resistance electrically connects with the positive voltage terminal of described power circuit part, described integrated
First inverting input of operational amplifier respectively with one end of described 6th resistance, the one of described 7th resistance
End electrical connection, the other end of described 6th resistance electrically connects with one end of described 4th electric capacity, described 4th electricity
The other end held electrically connects with one end of described potentiometer, the other end of described potentiometer and described power circuit
The negative voltage side electrical connection in portion, the second outfan of described integrated operational amplifier is another with described 7th resistance
One end electrically connects.
Highly sensitive radio monitor the most as claimed in claim 1, it is characterised in that: described high-frequency emission
Circuit part include the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the 8th resistance,
9th resistance, inductance and an audion, the second outfan electrical connection described the of described integrated operational amplifier
One end of five electric capacity, the other end of described 5th electric capacity respectively with one end of described 6th electric capacity, the described 8th
One end of resistance and the base stage electrical connection of described audion, the other end of described 6th electric capacity and described 8th electricity
Resistance the other end electrically connect with the positive voltage terminal of described power circuit part, the emitter stage of described audion respectively with
One end electrical connection of one end of described 9th electric capacity, one end of described 9th resistance and described 8th electric capacity, institute
State the negative voltage side of the other end of the 9th electric capacity and the other end of described 9th resistance and described power circuit part
Electrical connection, the colelctor electrode of described audion respectively with one end of described 7th electric capacity, one end of described inductance,
The other end of described 8th resistance and transmitting antenna electric connect, the other end of described 7th electric capacity and described inductance
The other end electrically connect with the positive voltage terminal of described power circuit part.
Highly sensitive radio monitor the most as claimed in claim 1, it is characterised in that: described power circuit
Portion includes the tenth electric capacity, switch and a power supply, the positive pole of described power supply respectively with one end of described switch and
One end electrical connection of described tenth electric capacity, the other end of described switch is electrically connected with the other end of described tenth electric capacity
Connect, the other end of described switch as electrically connect described first order amplifying circuit portion, amplifying circuit portion, the second level,
High frequency transmission circuit portion and the positive voltage terminal of described single-chip microcomputer, the negative pole of described power supply is as the described first order
Amplifying circuit portion, amplifying circuit portion, the second level, high frequency transmission circuit portion and the negative voltage side of described single-chip microcomputer.
Highly sensitive radio monitor the most as claimed in claim 1, it is characterised in that: described integrated computation
The model of amplifier is LM324.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610388791.9A CN105979435A (en) | 2016-06-03 | 2016-06-03 | High sensitivity wireless monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610388791.9A CN105979435A (en) | 2016-06-03 | 2016-06-03 | High sensitivity wireless monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105979435A true CN105979435A (en) | 2016-09-28 |
Family
ID=57010691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610388791.9A Pending CN105979435A (en) | 2016-06-03 | 2016-06-03 | High sensitivity wireless monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105979435A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018205377A1 (en) * | 2017-05-10 | 2018-11-15 | 深圳市大疆创新科技有限公司 | Interceptor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018205377A1 (en) * | 2017-05-10 | 2018-11-15 | 深圳市大疆创新科技有限公司 | Interceptor |
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Application publication date: 20160928 |