CN101420237A - Monitoring circuit - Google Patents
Monitoring circuit Download PDFInfo
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- CN101420237A CN101420237A CNA2007102022039A CN200710202203A CN101420237A CN 101420237 A CN101420237 A CN 101420237A CN A2007102022039 A CNA2007102022039 A CN A2007102022039A CN 200710202203 A CN200710202203 A CN 200710202203A CN 101420237 A CN101420237 A CN 101420237A
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- triode
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- amplifying circuit
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Abstract
The present invention provides a monitor circuit comprising a direct-current power supply, a microphone, an amplifying circuit, an output adjusting circuit and an antenna, wherein, the microphone receives sound signals and transmitting the sound signals to the amplifying circuit, the amplifying circuit filters, couples and amplifies the sound signals and then transmits the processed sound signals to the output adjusting circuit, the output adjusting circuit transforms the amplified sound signals into a resonance wave which is then transmitted to the antenna, and the antenna transmits the resonance wave of sound signals to the outside. The monitor circuit has a simple manufacture, a low wastage, a low cost and a stable working state.
Description
Technical field
The present invention relates to a kind of monitoring circuit.
Background technology
The father and mother baby who sleep soundly away from keyboard is when going into the lavatory, having a rest, do housework etc., and it is neglected often to worry that the baby wakes up midway, thereby can't be devoted to other affairs.Use monitor can make father and mother understand baby's state constantly, thereby avoided the generation of the problems referred to above.But existing monitor technical sophistication, price is higher, is not suitable for family and uses.And known monitor main purpose is to be applied to commercial location, and its creation theory is different with the present invention.
Summary of the invention
In view of above content, be necessary to provide a kind of facility and be suitable for the monitor that use in more places.
A kind of monitoring circuit, comprise a direct current power supply, a microphone, an amplifying circuit, an output regulation circuit and an antenna, described microphone receives voice signal and is sent to described amplifying circuit, described amplifying circuit is delivered to described output regulation circuit with voice signal filtering coupling and after amplifying, described output regulation circuit will change into resonance wave through the voice signal that amplifies and be sent to described antenna, and the voice signal that described antenna will change into behind the resonance wave is outwards launched.
Compare prior art, described monitoring circuit has been used described amplifying circuit voice emplifying signal, described output regulation circuit will change into that resonance wave is sent to described antenna, described antenna is outwards launched voice signal through the voice signal that amplifies, and do not need complex circuit design, thereby reduced the complexity of monitoring circuit design and the difficulty of use, but also reduced cost.
Description of drawings
The present invention is further illustrated in conjunction with embodiment below with reference to accompanying drawing.
Fig. 1 is the circuit diagram of the better embodiment of monitoring circuit of the present invention.
Embodiment
Please refer to Fig. 1, monitoring circuit of the present invention is applied to places such as baby room, gate or corridor, and its better embodiment comprises a direct current power Vcc, a toggle switch SW1, a microphone 10, an amplifying circuit 20, an output regulation circuit 30 and a half-wave antenna 40.
Described amplifying circuit 20 comprises a first order amplifying circuit 22 and a second level amplifying circuit 24.Described first order amplifying circuit 22 comprises a capacitor C 1, a triode Q1, a resistance R 1, a resistance R 2 and a resistance R 3.One end of described capacitor C 1 is connected to the base stage of described triode Q1, the other end of described capacitor C 1 connects the collector electrode that is connected to described triode Q1 behind described resistance R 1, the R3 successively, the two ends of described resistance R 2 are connected to base stage and the collector electrode of described triode Q1 respectively, one end of described microphone 10 is connected to the emitter of described triode Q1, and the other end of described microphone 10 is connected to the base stage of described triode Q1 by described capacitor C 1.In the present embodiment, the capacitance of described capacitor C 1 is 22nF, and the resistance value of described resistance R 1 is 22k Ω, and the resistance value of described resistance R 2 is 1M Ω, and the resistance value of described resistance R 3 is 10k Ω, and described triode Q1 is the BC547 type.
Described second level amplifying circuit 24 comprises a capacitor C 2, a capacitor C 3, a triode Q2, a resistance R 4 and a resistance R 5.The two ends of described capacitor C 2 are connected to the collector electrode of described triode Q1 and the base stage of described triode Q2 respectively, one end of described capacitor C 3 is connected to the base stage of described triode Q2, the other end of described capacitor C 3 is connected to the emitter of described triode Q1, the other end of described capacitor C 3 also is connected to the emitter of described triode Q2 by described resistance R 5, one end of described resistance R 4 is connected to the base stage of described triode Q2, and the other end of described resistance R 4 is connected to the node between described resistance R 1 and the described resistance R 3.In the present embodiment, the capacitance of described capacitor C 2 is 1 μ F, and the capacitance of described capacitor C 3 is lnF, and the resistance value of described resistance R 4 is 22k Ω, and the resistance value of described resistance R 5 is 470 Ω, and described triode Q2 is the BC547 type.
Described output regulation circuit 30 comprises a LC oscillating circuit 32, a capacitor C 5 and a capacitor C 6, and described LC oscillating circuit 32 comprises a capacitor C 4 and an inductance L 1.Described capacitor C 4 composes in parallel described LC oscillating circuit 32 with described inductance L 1, first end of described LC oscillating circuit 32 is connected to the collector electrode of described triode Q2, second end of described LC oscillating circuit 32 is connected to the node between described resistance R 3 and the described resistance R 4, one end of described capacitor C 5 is connected to the emitter of described triode Q2, the other end of described capacitor C 5 is connected to the collector electrode of described half-wave antenna 40 and described triode Q2, one end of described capacitor C 6 is connected to second end of described LC oscillating circuit 32, and the other end of described capacitor C 6 is connected to the emitter of described triode Q2 by described resistance R 5.In the present embodiment, the capacitance of described capacitor C 4 is 47pF, and described capacitor C 5 is a tunable capacitor, its capacitance scope is 15-20pF, its optimal capacitance value is 18pF, and the capacitance of described capacitor C 6 is 22nF, and described inductance L 1 is for enclosing around 5 on the carbon-point of 3mm diameter with No. 22 B or S enamelled wire.
The positive pole of described DC power supply Vcc is connected to second end of described LC oscillating circuit 32 by described toggle switch SW1, and the negative pole of described DC power supply Vcc is connected to the emitter of described triode Q2 by described resistance R 5.In the present embodiment, described DC power supply voltage is 3V.
When using described monitoring circuit, closed described toggle switch SW1, described monitoring circuit is promptly switched on, described triode Q1, described triode Q2 conducting.Sound imports described first order amplifying circuit 22 into by microphone 10, voice signal is through described capacitor C 1 filtering, be delivered to the base stage of described triode Q1 after the coupling, the back collector electrode from described triode Q1 of process amplification comes out and enters described second level amplifying circuit 24, the voice signal that the described first order amplifying circuit 22 of process amplifies is by described capacitor C 2 filtering, be delivered to the base stage of described triode Q2 after the coupling, the back collector electrode from described triode Q2 of process amplification comes out and enters into described output regulation circuit 30, described LC oscillating circuit 32 will output to described half-wave antenna 40 after will changing into resonance wave through the voice signal that two-stage is amplified, and described half-wave antenna 40 is tuning with voice signal, frequency conversion, in put, be transmitted into after the detection in the scope far away.Adopt wireless receiver can receive voice signal and broadcast, the user just can hear the sound that listens to.
The effect of described capacitor C 3 is the signal feedback of the collector electrode output of described triode Q1 is carried out signal compensation to the base stage of described triode Q1, and the effect of described capacitor C 6 is the signal feedback of the collector electrode output of described triode Q2 is carried out signal compensation to the base stage of described triode Q2.Because the capacitance scope of described capacitor C 5 is 15 ~ 20pF, can reach best output frequency by the capacitance of regulating described capacitor C 5, improve emission effciency.
Described monitoring circuit is easily made, and is cheap, just can be emitted to 300 meters or farther scope with 3V power supply and half-wave antenna; Current loss is few, gets final product continuous operation more than 80 hours with two joint dry cells; And working stability, frequency drift is minimum, and working did not still need school receiver again in 8 hours afterwards.
Claims (10)
- [claim 1] a kind of monitoring circuit, comprise a direct current power supply, a microphone, an amplifying circuit, an output regulation circuit and an antenna, described microphone receives voice signal and is sent to described amplifying circuit, described amplifying circuit is delivered to described output regulation circuit with voice signal filtering coupling and after amplifying, described output regulation circuit will change into resonance wave through the voice signal that amplifies and be sent to described antenna, and the voice signal that described antenna will change into behind the resonance wave is outwards launched.
- [claim 2] monitoring circuit as claimed in claim 1 is characterized in that: described amplifying circuit comprises a continuous first order amplifying circuit and a second level amplifying circuit.
- [claim 3] monitoring circuit as claimed in claim 2, it is characterized in that: described first order amplifying circuit comprises one first resistance, one second resistance, one the 3rd resistance, one first electric capacity and one first triode, one end of described first electric capacity is connected to the base stage of described first triode, the other end of described first electric capacity connects described first resistance successively, be connected to the collector electrode of described first triode behind the 3rd resistance, the two ends of described second resistance are connected to the base stage and the collector electrode of described first triode respectively, one end of described microphone is connected to the emitter of described first triode, the other end of described microphone is connected to the base stage of described first triode by described first electric capacity, and the node between described first resistance and the 3rd resistance and the collector and emitter of described first triode link to each other with described second level amplifying circuit respectively.
- [claim 4] monitoring circuit as claimed in claim 3, it is characterized in that: described second level amplifying circuit comprises one the 4th resistance, one the 5th resistance, one second electric capacity and one second triode, the two ends of described second electric capacity are connected to the base stage of the collector electrode and described second triode of described first triode respectively, one end of described the 4th resistance is connected to the base stage of described second triode, the other end of described the 4th resistance is connected to the node between described first resistance and described the 3rd resistance, one end of described the 5th resistance is connected to the emitter of described second triode, the other end of described the 5th resistance is connected to the emitter of described first triode, and described second level amplifying circuit is connected to described output regulation circuit.
- [claim 5] monitoring circuit as claimed in claim 4, it is characterized in that: described second level amplifying circuit also comprises one the 3rd electric capacity, and the two ends of described the 3rd electric capacity are connected to the base stage of described second triode and the emitter of described first triode respectively.
- [claim 6] monitoring circuit as claimed in claim 4, it is characterized in that: described output regulation circuit comprises a LC oscillating circuit and one the 5th electric capacity, first end of described LC oscillating circuit is connected to the collector electrode of described second triode, second end of described LC oscillating circuit is connected to the node between described the 4th resistance and described the 3rd resistance, one end of described the 5th electric capacity is connected to the emitter of described second triode, the other end of described the 5th electric capacity is connected to the collector electrode of described antenna and described second triode, the positive pole of described DC power supply is connected to second end of described LC oscillating circuit, and the negative pole of described DC power supply is connected to the emitter of described second triode by described the 5th resistance.
- [claim 7] monitoring circuit as claimed in claim 6 is characterized in that: described LC oscillating circuit comprises one the 4th electric capacity and an inductance, described the 4th electric capacity with form described LC oscillating circuit after described inductance is in parallel.
- [claim 8] monitoring circuit as claimed in claim 6, it is characterized in that: described output regulation circuit also comprises one the 6th electric capacity, one end of described the 6th electric capacity is connected to second end of described LC oscillating circuit, and the other end of described the 6th electric capacity is connected to the emitter of described second triode by described the 5th resistance.
- [claim 9] monitoring circuit as claimed in claim 6 is characterized in that: described the 5th electric capacity is tunable capacitor.
- [claim 10] monitoring circuit as claimed in claim 6 is characterized in that: be connected a toggle switch between the 3rd end of described LC oscillating circuit and the described DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102022039A CN101420237A (en) | 2007-10-22 | 2007-10-22 | Monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102022039A CN101420237A (en) | 2007-10-22 | 2007-10-22 | Monitoring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101420237A true CN101420237A (en) | 2009-04-29 |
Family
ID=40630872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007102022039A Pending CN101420237A (en) | 2007-10-22 | 2007-10-22 | Monitoring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101420237A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427851A (en) * | 2012-05-22 | 2013-12-04 | 成都酷玩网络科技有限公司 | Multifunctional miniature frequency modulation emitter |
| CN104697627A (en) * | 2013-12-09 | 2015-06-10 | 深圳市海洋王照明工程有限公司 | Voice and vibration detection circuit and voice and vibration detection device |
| CN105979435A (en) * | 2016-06-03 | 2016-09-28 | 苏州工业职业技术学院 | High sensitivity wireless monitor |
| CN109596111A (en) * | 2018-12-05 | 2019-04-09 | 柳州铁道职业技术学院 | A kind of total station for passing on a message |
-
2007
- 2007-10-22 CN CNA2007102022039A patent/CN101420237A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427851A (en) * | 2012-05-22 | 2013-12-04 | 成都酷玩网络科技有限公司 | Multifunctional miniature frequency modulation emitter |
| CN104697627A (en) * | 2013-12-09 | 2015-06-10 | 深圳市海洋王照明工程有限公司 | Voice and vibration detection circuit and voice and vibration detection device |
| CN105979435A (en) * | 2016-06-03 | 2016-09-28 | 苏州工业职业技术学院 | High sensitivity wireless monitor |
| CN109596111A (en) * | 2018-12-05 | 2019-04-09 | 柳州铁道职业技术学院 | A kind of total station for passing on a message |
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Application publication date: 20090429 |