CN205902055U - Highly sensitive wireless monitor - Google Patents
Highly sensitive wireless monitor Download PDFInfo
- Publication number
- CN205902055U CN205902055U CN201620533872.9U CN201620533872U CN205902055U CN 205902055 U CN205902055 U CN 205902055U CN 201620533872 U CN201620533872 U CN 201620533872U CN 205902055 U CN205902055 U CN 205902055U
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- electric capacity
- resistance
- circuit portion
- electrically connected
- operational amplifier
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Abstract
The utility model discloses a highly sensitive wireless monitor, including microphone, first order amplifier circuit portion, second level amplifier circuit portion, high -frequency emission circuit part and power supply circuit portion, the microphone converts sound sound signal to voltage signal, and the voltage signal that first order amplifier circuit inferior officer microphone produced carries out the first time and enlargies, and the voltage signal that second level amplifier circuit inferior officer first order amplifier circuit portion produced carries out the second time and enlargies, and the voltage signal that secondary amplification 1 inferior officer second level amplifier circuit portion produced converts secondary amplification 4 to and launches to secondary amplification 5. Is the monitor emission frequency 88 indoor or outdoor faint sound sound signal can be monitored to 108MHZ's within range, monitor scope within 100m.
Description
Technical field
This utility model is related to a kind of audiomonitor, the highly sensitive radio monitor that more particularly, to a kind of partition wall uses.
Background technology
Due to arresting the needs of offender, the monitoring to offender becomes the detecting means being highly desirable to.
Existing audiomonitor volume is excessively huge, leads to adaptable scope not extensive, and service precision is not also high, using becoming
This too high it is impossible to meet present demand.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of highly sensitive radio monitor, and its small volume is highly sensitive,
Low production cost, 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, second level amplifying circuit portion, high-frequency emission
Circuit portion and power circuit part, acoustical signal is converted into the signal of telecommunication by described microphone, and described first order amplifying circuit portion will be described
The signal of telecommunication that microphone produces carries out amplifying for the first time, and described first order amplifying circuit portion is produced by described second level amplifying circuit portion
The signal of telecommunication carry out second amplification, the signal of telecommunication that described second level amplifying circuit portion produces is converted into by described oscillating circuit portion
Radiofrequency signal is launched to surrounding space.
Described microphone is Electret condenser microphone.
Described first order amplifying circuit portion include integrated operational amplifier, first resistor, second resistance, 3rd resistor,
Four resistance, the 5th resistance, the first electric capacity and the second electric capacity, the first in-phase input end of described integrated operational amplifier respectively with institute
State one end electrical connection of one end, one end of described second resistance and described 3rd resistor of the second electric capacity, described second electric capacity
The other end of the other end and described 3rd resistor is electrically connected with the negative voltage side of described power circuit part, and described second resistance is electrically connected
Connect the positive voltage terminal of described power circuit part, the first inverting input of described integrated operational amplifier is electric with the described 4th respectively
One end of resistance, one end electrical connection of described 5th resistance, the other end of described 4th resistance is electric with one end of described first electric capacity
Connect, the other end of described first electric capacity is electrically connected with one end of described first resistor, described microphone respectively, described first resistor
Another termination positive source, the first outfan of described integrated operational amplifier is electrically connected the another of described 5th resistance
End, one end of described 3rd electric capacity, the other end of described 3rd electric capacity is connected with one end of described potentiometer, described potentiometer
The other end is electrically connected with the negative voltage side at power circuit end.
Described second level amplifying circuit portion include integrated operational amplifier, second resistance, 3rd resistor, the 6th resistance,
Seven resistance, the second electric capacity, the 4th electric capacity and potentiometer, the second in-phase input end of described integrated operational amplifier respectively with described
One end of one end of the second electric capacity, one end of described second resistance and described 3rd resistor connects, described second electric capacity another
The other end of end and described 3rd resistor is electrically connected with the negative voltage side of described power circuit part, the other end of described second resistance
Electrically connect with the positive voltage terminal of described power circuit part, the first inverting input of described integrated operational amplifier respectively with described
One end of 6th resistance, one end electrical connection of described 7th resistance, the other end of described 6th resistance and described 4th electric capacity
One end electrically connects, and the other end of described 4th electric capacity electrically connects with one end of described potentiometer, the other end of described potentiometer and
The negative voltage side electrical connection of described power circuit part, the second outfan of described integrated operational amplifier and described 7th resistance
The other end electrically connects.
Described high frequency transmission circuit portion include the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity,
Eight resistance, the 9th resistance, inductance and an audion, described 5th electricity of the second outfan electrical connection of described integrated operational amplifier
The one end holding, the other end of described 5th electric capacity respectively with one end of described 6th electric capacity, one end of described 8th resistance and institute
State the base stage electrical connection of audion, the other end of described 6th electric capacity and the other end of described 8th resistance and described power circuit
The positive voltage terminal electrical connection in portion, the emitter stage of described audion respectively with one end of described 9th electric capacity, described 9th resistance
One end electrical connection, the other end of described 9th electric capacity and the other end of described 9th resistance and the institute of one end and described 8th electric capacity
State the negative voltage side electrical connection of power circuit part, the colelctor electrode of described audion respectively with one end of described 7th electric capacity, described
One end of inductance, the other end of described 8th resistance and transmitting antenna electrical connection, the other end of described 7th electric capacity and described electricity
The other end of sense is electrically connected with the positive voltage terminal of described power circuit part.
Described power circuit part includes the tenth electric capacity, a switch and a power supply, and the positive pole of described power supply is opened with described respectively
The one end closed 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 is as the described first order amplifying circuit portion of electrical connection, second level amplifying circuit portion, high-frequency emission electricity
Road portion and the positive voltage terminal of described single-chip microcomputer, the negative pole of described power supply is put as described first order amplifying circuit portion, the second level
The negative voltage side in big circuit portion, high frequency transmission circuit portion and described single-chip microcomputer.
Model lm324 of described integrated operational amplifier.
The Advantageous Effects that technique scheme is brought are:
Small volume, easily installs and is discovered by offender；
Sensitivity is high, 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；
Low production cost, therefore relatively low using threshold.
Brief description
Fig. 1 is the circuit diagram of this utility model one embodiment；
Fig. 2 is the schematic diagram of the integrated operational amplifier lm324 of this utility model one embodiment.
Specific embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, new to this practicality below in conjunction with accompanying drawing
Each embodiment of type is explained in detail.
Illustrate concrete referring generally to accompanying drawing and with reference to Fig. 1, highly sensitive radio monitor, including Electret condenser microphone
Mic, first order amplifying circuit portion, second level amplifying circuit portion, high frequency transmission circuit portion and power circuit part, Electret condenser microphone
Acoustical signal is converted into the signal of telecommunication by mic, and the signal of telecommunication that Electret condenser microphone mic produces is carried out first by first order amplifying circuit portion
Secondary amplification, the signal of telecommunication that first order amplifying circuit portion produces is carried out second amplification, oscillating circuit by second level amplifying circuit portion
The signal of telecommunication that second level amplifying circuit portion produces is converted into radiofrequency signal and launches to surrounding space by portion.
First in-phase input end 1in+ of lm324 integrated operational amplifier one end, the second electricity with the second electric capacity c2 respectively
One end electrical connection of one end of resistance r2 and 3rd resistor r3, the other end of the second electric capacity c2 and the other end of 3rd resistor r3 and electricity
The negative pole electrical connection of pond bt, one end of second resistance r2 electrical connection switch s, the other end of switch s is electrically connected with the positive pole of battery bt
Connect, the first inverting input 1in- of lm324 integrated operational amplifier respectively with one end of the 4th resistance r4, the 5th resistance r5
One end electrically connects, and the other end of the 4th resistance r4 is electrically connected with one end of the first electric capacity c1, and the other end of the first electric capacity c1 is respectively
Electrically connect with one end of first resistor r1, Electret condenser microphone mic, the other end of first resistor r1 is electrically connected with one end of switch s,
First outfan 1out of lm324 integrated operational amplifier is electrically connected the other end of the 5th resistance r5, the 3rd electric capacity c3
One end, the other end of the 3rd electric capacity c3 is connected with one end of potentiometer rpa, the negative pole of the other end of potentiometer rpa and battery bt
Electrical connection, the second in-phase input end 2in+ of lm324 integrated operational amplifier and the first homophase of lm324 integrated operational amplifier
Input 1in+ electrically connects, the second inverting input 2in- of lm324 integrated operational amplifier respectively with the 6th resistance r6 one
End, one end electrical connection of the 7th resistance r7, the other end of the 6th resistance r6 is electrically connected with one end of the 4th electric capacity c4, the 4th electric capacity
The other end of c4 is electrically connected with one end of potentiometer rpa, and the other end of potentiometer rpa is electrically connected with the negative pole of battery bt, lm324
Second outfan 2out of integrated operational amplifier is electrically connected with the other end of the 7th resistance r7.
Second outfan 2out of lm324 integrated operational amplifier electrically connects one end of the 5th electric capacity c5, the 5th electric capacity c5
The other end electrically connect with one end of the 6th electric capacity c6, one end of the 8th resistance r8 and the base stage of audion d-50 respectively, the 6th
The other end of electric capacity c6 is electrically connected with one end of switch s with the other end of the 8th resistance r8, and the emitter stage of audion d-50 is respectively
Electrically connect with one end of the 9th electric capacity c9, one end of the 9th resistance r9 and one end of the 8th electric capacity c8, the 9th electric capacity c9's is another
End and the other end of the 9th resistance r9 are electrically connected with the negative pole of battery bt, the colelctor electrode of audion d-50 respectively with the 7th electric capacity c7
One end, 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 is electrically connected with one end of switch s, and one end of the tenth electric capacity c10 is electrically connected with one end of switch s, the tenth electricity
The other end holding c10 is electrically connected with the negative pole of battery bt.
Referring to Fig. 2, lm324 family device is four road operational amplifiers of low cost, has real Differential Input.In list
In power supply application, they have several obvious advantages compared with standard operational amplifier type.This No. four amplifier can be with work
Make the as little as supply voltage of 3.0v or up to 32v, quiescent current is 1/5th about (each amplifier) of mc1741.Common mode
Input range includes negative supply, therefore without external bias components and parts in numerous applications.Output voltage range also includes negative electricity
Source voltage.
Circuit operation principle:
After Electret condenser microphone mic detects faint sound signal, just produce signal voltage at its two ends, through the first electric capacity
The first in-phase input end 1in+ that c1 device is coupled to integrated computation circuit is amplified, and its gain amplifier reaches more than 20 decibels, warp
After crossing first order amplification, from the first outfan 1out output of integrated operational amplifier, couple through the 3rd electric capacity c3 device, electricity
Position device rpa controls the second inverting input 2in- entering into integrated operational amplifier to carry out second level amplification, through the first order
Amplify after amplifying with the second level, faint sound signal is put into enough amplitudes, is then coupled to audion d- by the 5th electric capacity c5
50 base stage, constitutes high-frequency oscillating circuitss by audion d-50 and lc oscillating circuit, and the carrier wave after voice modulation passes through to launch sky
Line ant launches to surrounding space, can uppick in the scope outside 100m with a fm radio.5th resistance r5 and the 7th
Resistance r7 is the negative feedback resistor of integrated operational amplifier, adjusts its resistance and can change gain factor.Adjustment potentiometer rpa makes
Output signal strength is moderate.Adjustment inductance l and the 7th electric capacity c7 makes tranmitting frequency fall in the range of 88-108mhz.
The above, only this utility model preferably specific embodiment, but protection domain of the present utility model is not
It is confined to this, any those familiar with the art, in the technical scope that this utility model discloses, can readily occur in
Change or replacement, all should cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should
It is defined by scope of the claims.
Claims (7)
1. a kind of highly sensitive radio monitor it is characterised in that: include microphone, first order amplifying circuit portion, the second level amplify electricity
Road portion, high frequency transmission circuit portion and power circuit part, acoustical signal is converted into the signal of telecommunication by described microphone, and the described first order is amplified
The signal of telecommunication that described microphone produces is carried out amplifying for the first time by circuit portion, and the described first order is put by described second level amplifying circuit portion
The signal of telecommunication that big circuit portion produces carries out second amplification, and described second level amplifying circuit portion is produced by described oscillating circuit portion
The signal of telecommunication is converted into radiofrequency signal and launches to surrounding space.
2. as claimed in claim 1 highly sensitive radio monitor it is characterised in that: described microphone be Electret condenser microphone.
3. as claimed in claim 1 highly sensitive radio monitor it is characterised in that: described first order amplifying circuit portion include collect
Become operational amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first electric capacity and the second electric capacity,
First in-phase input end of described integrated operational amplifier one end with one end of described second electric capacity, described second resistance respectively
With one end electrical connection of described 3rd resistor, the other end of described second electric capacity and the other end of described 3rd resistor and described electricity
The negative voltage side electrical connection in source circuit portion, described second resistance electrically connects the positive voltage terminal of described power circuit part, described integrated
First inverting input of operational amplifier is electrically connected with one end of described 4th resistance, one end of described 5th resistance respectively,
The other end of described 4th resistance is electrically connected with one end of described first electric capacity, the other end of described first electric capacity respectively with described
One end of first resistor, the electrical connection of described microphone, another termination positive source of described first resistor, described integrated computation amplifies
First outfan of device is electrically connected the other end of described 5th resistance, one end of described 3rd electric capacity, described 3rd electric capacity
The other end be connected with one end of a potentiometer, the other end of described potentiometer is electrically connected with the negative voltage side at power circuit end.
4. as claimed in claim 1 highly sensitive radio monitor it is characterised in that: described second level amplifying circuit portion include collect
Become operational amplifier, second resistance, 3rd resistor, the 6th resistance, the 7th resistance, the second electric capacity, the 4th electric capacity and potentiometer, institute
State the second in-phase input end of integrated operational amplifier respectively with one end of described second electric capacity, one end of described second resistance and
One end of described 3rd resistor connects, and the other end of described second electric capacity and the other end of described 3rd resistor are electric with described power supply
The negative voltage side electrical connection in road portion, the other end of described second resistance is electrically connected with the positive voltage terminal of described power circuit part, institute
State the first inverting input of integrated operational amplifier one end electricity respectively with one end of described 6th resistance, described 7th resistance
Connect, the other end of described 6th resistance electrically connected with one end of described 4th electric capacity, the other end of described 4th electric capacity and institute
State one end electrical connection of potentiometer, the other end of described potentiometer is electrically connected with the negative voltage side of described power circuit part, described
Second outfan of integrated operational amplifier is electrically connected with the other end of described 7th resistance.
5. as claimed in claim 1 highly sensitive radio monitor it is characterised in that: described high frequency transmission circuit portion includes the 5th
Electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the 8th resistance, the 9th resistance, inductance and an audion, one
Second outfan of integrated operational amplifier electrically connects one end of described 5th electric capacity, the other end of described 5th electric capacity respectively with
The base stage electrical connection of one end, one end of described 8th resistance and described audion of described 6th electric capacity, described 6th electric capacity
The other end is electrically connected with the positive voltage terminal of described power circuit part with the other end of described 8th resistance, the transmitting of described audion
Pole is electrically connected with one end of described 9th electric capacity, one end of described 9th resistance and one end of described 8th electric capacity respectively, described
The other end of the other end of the 9th electric capacity and described 9th resistance is electrically connected with the negative voltage side of described power circuit part, and described three
The colelctor electrode of pole pipe respectively with one end of described 7th electric capacity, one end of described inductance, the other end of described 8th resistance and send out
Penetrate antenna electrical connection, the positive voltage terminal of the other end of described 7th electric capacity and the other end of described inductance and described power circuit part
Electrical connection.
6. as claimed in claim 1 highly sensitive radio monitor it is characterised in that: described power circuit part include the tenth electricity
Hold, one switchs and a power supply, the positive pole of described power supply is electrically connected with one end of described switch and one end of described tenth electric capacity respectively
Connect, the other end of described switch is electrically connected with the other end of described tenth electric capacity, the other end of described switch is as electrical connection institute
State first order amplifying circuit portion, the positive voltage terminal in second level amplifying circuit portion, high frequency transmission circuit portion and a single-chip microcomputer, described
The negative pole of power supply is as described first order amplifying circuit portion, second level amplifying circuit portion, high frequency transmission circuit portion and described list
The negative voltage side of piece machine.
7. the highly sensitive radio monitor as described in claim 3 or 4 or 5 it is characterised in that: described integrated operational amplifier
Model lm324.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620533872.9U CN205902055U (en) | 2016-06-03 | 2016-06-03 | Highly sensitive wireless monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620533872.9U CN205902055U (en) | 2016-06-03 | 2016-06-03 | Highly sensitive wireless monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205902055U true CN205902055U (en) | 2017-01-18 |
Family
ID=57767324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620533872.9U Expired - Fee Related CN205902055U (en) | 2016-06-03 | 2016-06-03 | Highly sensitive wireless monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205902055U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105979435A (en) * | 2016-06-03 | 2016-09-28 | 苏州工业职业技术学院 | High sensitivity wireless monitor |
-
2016
- 2016-06-03 CN CN201620533872.9U patent/CN205902055U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105979435A (en) * | 2016-06-03 | 2016-09-28 | 苏州工业职业技术学院 | High sensitivity wireless monitor |
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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 |
Granted publication date: 20170118 Termination date: 20170603 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |