CN106351862B - A kind of soft start pouity dwelling place automatic exhaust system - Google Patents
A kind of soft start pouity dwelling place automatic exhaust system Download PDFInfo
- Publication number
- CN106351862B CN106351862B CN201610855275.2A CN201610855275A CN106351862B CN 106351862 B CN106351862 B CN 106351862B CN 201610855275 A CN201610855275 A CN 201610855275A CN 106351862 B CN106351862 B CN 106351862B
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- capacitance
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- resistance
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0054—Specially adapted to detect a particular component for ammonia
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
Abstract
The invention discloses a kind of soft start pouity dwelling place automatic exhaust systems, it is characterized in that, mainly by exhaust fan M, detection circuit, amplifier P1, amplifier P2, the capacitance C3 that cathode is connected with the anode of amplifier P1, anode is connected with detection circuit, the capacitance C4 that cathode is connected with the output end of amplifier P1, anode is connected after resistance R4 with the anode of capacitance C3, the compositions such as anode is connected with the anode of capacitance C3, the capacitance C2 that cathode is connected with the cathode of amplifier P1.The present invention can be filtered the interference signal being entrained in detection signal, improve the cleannes of detection signal, so as to more accurately control exhaust fan work, be effectively aerated ventilation to pouity dwelling place, the air quality in pouity dwelling place improved, in favor of penkeeping.The present invention has soft start function, so as to protect electronic component not damaged by surge current well.
Description
Technical field
The present invention relates to home poultry raising field, in particular to a kind of soft start pouity dwelling place automatic exhaust systems.
Background technology
The environmental aspect of pouity dwelling place and the health of livestock are closely related, if the environmental degradation of pouity dwelling place can lead to livestock incidence
Increase, especially in cultivation density is big or enclosed breeding environment, since ventilation effect is bad, the ammonia inside pouity dwelling place is dense
Degree is higher, this influence to livestock is particularly acute.In order to reduce the concentration of ammonia in pouity dwelling place, raiser's generally use is vented automatically
System is aerated exhaust to pouity dwelling place, to improve the air quality in pouity dwelling place.However, existing automatic exhaust system due to by
The influence of interference signal, malfunction rate is higher, can not effectively ensure the quality of air in pouity dwelling place, be brought very with penkeeping
Big influence.
Invention content
It is an object of the invention to overcome existing automatic exhaust system due to the influence for the signal that is interfered, malfunction
The higher defect of rate provides a kind of soft start pouity dwelling place automatic exhaust system.
The purpose of the invention is achieved by the following technical solution：A kind of soft start pouity dwelling place automatic exhaust system, mainly by arranging
Gas fans M, detection circuit, amplifier P1, amplifier P2, and cathode is connected with the anode of amplifier P1, anode and detection circuit phase
The capacitance C3 of connection, cathode is connected with the output end of amplifier P1, anode is connected after resistance R4 with the anode of capacitance C3
Capacitance C4, anode be connected with the anode of capacitance C3, the capacitance C2 that cathode is connected with the cathode of amplifier P1, be serially connected in electricity
Hold the resistance R5 between the cathode and the cathode of capacitance C2 of C3, anode is connected with the cathode of amplifier P1, cathode and amplifier
The capacitance C5 that the output end of P1 is connected, the resistance R6 being in parallel with capacitance C5, anode be connected with the output end of amplifier P1,
The capacitance C6 that cathode is connected with the anode of amplifier P2, the resistance R7 being serially connected between the anode and output end of amplifier P2,
The resistance R8 being serially connected between the cathode and output end of amplifier P2, the trigger circuit being connected with the output end of amplifier P2,
And soft starting circuit and the switching circuit composition being connected respectively with trigger circuit；The cathode of the amplifier P1 respectively with inspection
Slowdown monitoring circuit and trigger circuit are connected, its output end is then connected with the cathode of amplifier P2；The output end of the amplifier P2
It is connected with trigger circuit；The trigger circuit is connected with detection circuit；The exhaust fan M is then serially connected in switching circuit and soft
Between start-up circuit.
Further, the soft starting circuit is by triode VT2, field-effect tube MOS, cathode after resistance R14 with three poles
The base stage of pipe VT2 is connected, anode meets the capacitance C10 of+15V voltages, is serially connected between the base stage and emitter of triode VT2
Resistance R15, the resistance R16 being serially connected between the collector of triode VT2 and the grid of field-effect tube MOS concatenate scene effect
Resistance R17 between the source electrode and grid of pipe MOS, anode is connected with the source electrode of field-effect tube MOS, cathode and field-effect tube
The capacitance pole C11, N that the grid of MOS is connected is connected with the source electrode of field-effect tube MOS, the drain electrode of the poles P and field-effect tube MOS
The diode D4 being connected, anode be connected with the drain electrode of field-effect tube MOS, the capacitance C12 that cathode is connected with trigger circuit,
And the resistance R18 compositions being in parallel with capacitance C12；The emitter of the triode VT2 is grounded.
The detection circuit by gas sensor B, one end is connected with the H2 pins of gas sensor B, the other end with put
The resistance R2 that the cathode of big device P1 is grounded while being connected, the electricity being serially connected between a pins of gas sensor B and H1 pins
Position device R1, anode be connected with the b pins of gas sensor B, the capacitance C1 that cathode is connected with the cathode of amplifier P1, and
The resistance R3 compositions being in parallel with capacitance C1；The b pins of the gas sensor B are connected with the anode of capacitance C3, its a pin
Then it is connected with trigger circuit.
The trigger circuit is by flip chip U, and the triode pole VT1, P is connected with the output end of amplifier P2, the poles N and three
The diode D1 that the base stage of pole pipe VT1 is connected, anode is connected with the emitter of triode VT1, cathode and flip chip U
The capacitance C8 that GND pins are connected, anode is connected with the CONT pins of flip chip U, cathode is connected with the cathode of capacitance C8
The capacitance C9 connect, the resistance R10 being serially connected between the DIS pins of flip chip U and TRIG pins, and anode is through resistance R11
It is connected afterwards with the VCC pins of flip chip U, the capacitance C7 that cathode is connected after resistance R9 with the collector of triode VT1
Composition；The anode of the capacitance C7 is connected with a pins of gas sensor B；The cathode of the capacitance C8 is with amplifier P1's
Cathode is connected；The cathode of the capacitance C9 connects -15V voltages；The RE pins of the flip chip U are connected with its VCC pin,
Its THRE pin is then connected with the collector of triode VT1, its OUT pin is then connected with switching circuit；The capacitance C9
Cathode be also connected with switching circuit.
The switching circuit is by bidirectional thyristor D3, and the poles N are connected with the control terminal of bidirectional thyristor D3, the poles P are through resistance
The diode D2 being connected with the OUT pins of flip chip U after R12, and be serially connected in bidirectional thyristor D3 second plate and
Resistance R13 compositions between the cathode of capacitance C9；The exhaust fan M is then serially connected in the first anode and capacitance of bidirectional thyristor D3
Between the anode of C10.
The flip chip U is NE555 integrated chips.
The present invention compared with the prior art, has the following advantages and advantageous effect：
(1) present invention can be filtered the interference signal being entrained in detection signal, improve the cleaning of detection signal
Degree is effectively aerated ventilation to pouity dwelling place, improves the air matter in pouity dwelling place so as to more accurately control exhaust fan work
Amount, in favor of penkeeping.
(2) present invention has soft start function, so as to protect electronic component not damaged by surge current well.
Description of the drawings
Fig. 1 is the overall structure figure of the present invention.
Fig. 2 is the structure chart of the soft starting circuit of the present invention.
Specific implementation mode
The present invention is described in further detail with reference to embodiment, but embodiments of the present invention are not limited to
This.
Embodiment
As shown in Figure 1, the present invention is mainly by exhaust fan M, detection circuit, amplifier P1, amplifier P2, cathode and amplifier
The capacitance C3 that the anode of P1 is connected, anode is connected with detection circuit, cathode are connected with the output end of amplifier P1, are positive
The capacitance C4 being connected with the anode of capacitance C3 after resistance R4, anode is connected with the anode of capacitance C3, cathode and amplifier
The capacitance C2 that the cathode of P1 is connected, the resistance R5 being serially connected between the cathode of capacitance C3 and the cathode of capacitance C2, anode with put
The cathode of big device P1 is connected, the capacitance C5 that cathode is connected with the output end of amplifier P1, the resistance being in parallel with capacitance C5
R6, anode be connected with the output end of amplifier P1, the capacitance C6 that cathode is connected with the anode of amplifier P2, be serially connected in amplification
Resistance R7 between the anode and output end of device P2, the resistance R8 being serially connected between the cathode and output end of amplifier P2, and put
The trigger circuit that the output end of big device P2 is connected, and the soft starting circuit and switching circuit that are connected respectively with trigger circuit
Composition.The cathode of the amplifier P1 is connected with detection circuit and trigger circuit respectively, and output end is then with amplifier P2's
Cathode is connected.The output end of the amplifier P2 is connected with trigger circuit.The trigger circuit is connected with detection circuit.
The exhaust fan M is then serially connected between switching circuit and soft starting circuit.
The detection circuit is used to detect the concentration of ammonia in pouity dwelling place.The amplifier P1, capacitance C3, capacitance C4, resistance R4, electricity
Hold C5 and resistance R6 constitutes first filter；Amplifier P2, capacitance C6, resistance R7 and resistance R8 then constitute the second filtering
Device；Capacitance C3 and capacitance C6 is filter capacitor, and the detection signal that detection circuit exports conveys after being filtered by first filter
It is filtered to second filter, then by second filter, detection signal can preferably eliminate interference after filtering twice
Signal improves the cleannes of detection signal, so as to more accurately control exhaust fan work, is effectively aerated to pouity dwelling place
Ventilation improves the air quality in pouity dwelling place, in favor of penkeeping.Amplifier P1 and amplifier P2 is the amplification of OPA603 types
The capacitance of device, capacitance C3 and capacitance C6 are 100 μ F, and the capacitance of capacitance C2, capacitance C4 and capacitance C5 are 0.5 μ F, resistance
The resistance value of R4~R8 is 10K Ω.
The detection circuit is by gas sensor B, and one end is connected with the H2 pins of gas sensor B, the other end and amplification
The resistance R2 that the cathode of device P1 is grounded while being connected, the current potential being serially connected between a pins of gas sensor B and H1 pins
Device R1, anode be connected with the b pins of gas sensor B, the capacitance C1, Yi Jiyu that cathode is connected with the cathode of amplifier P1
The resistance R3 compositions that capacitance C1 is in parallel.The b pins of the gas sensor B are connected with the anode of capacitance C3, its a pin then
It is connected with trigger circuit.
Gas sensor B is set in pouity dwelling place, the concentration for detecting ammonia in pouity dwelling place, uses MQ137 type air-sensitives
Sensor.The permitted maximum concentration value of ammonia in pouity dwelling place can be set by potentiometer R1 when work, maximum value is
50KΩ.The resistance value of resistance R2 is 20K Ω, and the resistance value of resistance R3 is then 5K Ω, and the capacitance of capacitance C1 is 47 μ F.
The trigger circuit is by flip chip U, triode VT1, diode D1, resistance R9, resistance R10, resistance R11, electricity
Hold C7, capacitance C8 and capacitance C9 compositions.
The poles P of the diode D1 are connected with the output end of amplifier P2, and the poles N are connected with the base stage of triode VT1.
The anode of capacitance C8 is connected with the emitter of triode VT1, and cathode is connected with the GND pins of flip chip U.Capacitance C9's
Anode is connected with the CONT pins of flip chip U, and cathode is connected with the cathode of capacitance C8.Resistance R10 is serially connected in triggering core
Between the DIS pins and TRIG pins of piece U.The anode of capacitance C7 is connected after resistance R11 with the VCC pins of flip chip U,
Cathode is connected after resistance R9 with the collector of triode VT1.
The anode of the capacitance C7 is connected with a pins of gas sensor B.The cathode of the capacitance C8 and amplifier P1
Cathode be connected.The cathode of the capacitance C9 is connected with -15V voltages.The RE pins of the flip chip U are managed with its VCC
Foot is connected, and THRE pins are then connected with the collector of triode VT1, and OUT pins are then connected with switching circuit.Institute
The cathode for stating capacitance C9 is also connected with switching circuit.Exhaust fan M is then serially connected between the anode and switching circuit of capacitance C10.
Diode D1 is 2CK10 type switching diodes, the model 9013 of triode VT1, capacitance C7 and capacitance C8's
Capacitance is 10 μ F, and the capacitance of capacitance C9 is then 0.01 μ F, and the resistance value of resistance R9~R11 is 5K Ω.Flip chip U is used
NE555 integrated chips.
In addition, the switching circuit, by bidirectional thyristor D3, the poles N are connected with the control terminal of bidirectional thyristor D3, the poles P pass through
The diode D2 being connected with the OUT pins of flip chip U after resistance R12, and it is serially connected in the second sun of bidirectional thyristor D3
Resistance R13 compositions between pole and the cathode of capacitance C9.The first anode of the bidirectional thyristor D3 opens after exhaust fan M with soft
Dynamic circuit is connected.
The resistance value of the model TAG8518 of bidirectional thyristor D3, resistance R12 are 200K Ω, and diode D2 is 2CK10 types
The resistance value of switching diode, resistance R13 is 10K Ω.
As shown in Fig. 2, the soft starting circuit is by triode VT2, field-effect tube MOS, resistance R14, resistance R15, resistance
R16, resistance R17, resistance R18, capacitance C10, capacitance C11, capacitance C12 and diode D4 compositions.
When connection, the cathode of capacitance C10 is connected after resistance R14 with the base stage of triode VT2, and anode connects+15V electricity
Pressure.Resistance R15 is serially connected between the base stage and emitter of triode VT2.Resistance R16 be serially connected in triode VT2 collector and
Between the grid of field-effect tube MOS.Resistance R17 is serially connected between the source electrode and grid of field-effect tube MOS.The anode of capacitance C11
It is connected with the source electrode of field-effect tube MOS, cathode is connected with the grid of field-effect tube MOS.The poles N of diode D4 and field-effect
The source electrode of pipe MOS is connected, and the poles P are connected with the drain electrode of field-effect tube MOS.The drain electrode of capacitance C12 anodes and field-effect tube MOS
It is connected, cathode is connected with the anode of capacitance C7.Resistance R18 is in parallel with capacitance C12.The emitter of the triode VT2
Ground connection.
After control source is to soft starting circuit, capacitance C11 is charged by resistance R16, as the voltage of capacitance C11 is gradual
It increases, field-effect tube MOS is then slowly connected, and subsequent conditioning circuit is damaged to prevent the drain electrode of field-effect tube MOS from occurring being mutated
Electronic component.The model 3DO1H of the model SS8050LT of triode VT2, field-effect tube MOS, the capacitance of capacitance C11 are
The capacitance of 100 μ F, capacitance C10 and capacitance C12 are 1 μ F, and the resistance value of resistance R16 is 1K Ω, the resistance of resistance R14 and resistance R15
The resistance value that value is 4.7K Ω, resistance R17 and resistance R18 is 10K Ω, and diode D4 is then 1N4001 type triodes.
When work, system energization is given, gas sensor B acquires the concentration of ammonia in pouity dwelling place in real time, if ammonia in pouity dwelling place
Concentration when being not above permitted maximum value, the resistance value between a pins and b pins of gas sensor B is larger, b pipes
The current potential of foot is very low, diode D1 and triode VT1 cut-offs；The THRE pins of flip chip U are high level, and flip chip U is multiple
Position, OUT pins export low level, and diode D2 and bidirectional thyristor D3 cut-offs, exhaust fan M do not work.If ammonia in pouity dwelling place
When the concentration of gas is higher than the maximum concentration value allowed, the resistance value between a pins and b pins of gas sensor B becomes smaller, b pipes
Foot export high level, and to first filter and second filter processing after be conveyed to trigger circuit, to make diode D1 and
Triode VT1 conductings, at this moment the THRE pins of flip chip U are low level, the high electricity of flip chip U set its OUT pin output
Flat, diode D2 and bidirectional thyristor D3 conductings, exhaust fan M start by the air discharge in pouity dwelling place, to improve pouity dwelling place at this time
Interior air quality.When ammonia concentration drops to the maximum concentration value of permission or less in pouity dwelling place, exhaust fan M is then stopped.
The present invention can be filtered the interference signal being entrained in detection signal, improve the cleannes of detection signal,
It works so as to more accurately control exhaust fan, ventilation effectively is aerated to pouity dwelling place, improve the air quality in pouity dwelling place,
In favor of penkeeping.The present invention has soft start function, so as to protect electronic component not damaged by surge current well
It is bad.
As described above, the present invention can be realized well.
Claims (6)
1. a kind of soft start pouity dwelling place automatic exhaust system, including exhaust fan M, detection circuit, amplifier P1, amplifier P2 and are put
The trigger circuit that the output end of big device P2 is connected, the switching circuit being connected with trigger circuit, the cathode of the amplifier P1
It is connected respectively with detection circuit and trigger circuit, its output end is then connected with the cathode of amplifier P2；The amplifier P2
Output end be connected with trigger circuit；The trigger circuit is connected with detection circuit；It is characterized in that, further include cathode with
The capacitance C3 that the anode of amplifier P1 is connected, anode is connected with detection circuit, cathode are connected with the output end of amplifier P1
Connect, the capacitance C4 that is connected with the anode of capacitance C3 after resistance R4 of anode, anode is connected with the anode of capacitance C3, cathode and
The capacitance C2 that the cathode of amplifier P1 is connected, the resistance R5 being serially connected between the cathode of capacitance C3 and the cathode of capacitance C2, just
The capacitance C5 that pole is connected with the cathode of amplifier P1, cathode is connected with the output end of amplifier P1, is in parallel with capacitance C5
Resistance R6, anode be connected with the output end of amplifier P1, the capacitance C6 that cathode is connected with the anode of amplifier P2, concatenate
Resistance R7 between the anode and output end of amplifier P2, the resistance being serially connected between the cathode and output end of amplifier P2
R8, and the soft starting circuit that is connected with trigger circuit；The exhaust fan M be serially connected in switching circuit and soft starting circuit it
Between.
2. a kind of soft start pouity dwelling place automatic exhaust system according to claim 1, which is characterized in that the soft starting circuit
By triode VT2, field-effect tube MOS, cathode is connected after resistance R14 with the base stage of triode VT2, anode connects+15V voltages
Capacitance C10, the resistance R15 being serially connected between the base stage and emitter of triode VT2 is serially connected in the collector of triode VT2
Resistance R16 between the grid of field-effect tube MOS, the resistance R17 being serially connected between the source electrode and grid of field-effect tube MOS,
Anode be connected with the source electrode of field-effect tube MOS, the capacitance pole C11, N and field that cathode is connected with the grid of field-effect tube MOS
The diode D4 that the source electrode of effect pipe MOS is connected, the poles P are connected with the drain electrode of field-effect tube MOS, anode and field-effect tube
The drain electrode of MOS is connected, the capacitance C12 that cathode is connected with trigger circuit, and the resistance R18 groups being in parallel with capacitance C12
At；The emitter of the triode VT2 is grounded.
3. a kind of soft start pouity dwelling place automatic exhaust system according to claim 2, which is characterized in that the detection circuit by
Gas sensor B, it is same that one end is connected with the H2 pins of gas sensor B, the other end is connected with the cathode of amplifier P1
When the resistance R2, the potentiometer R1 being serially connected between a pins of gas sensor B and H1 pins that are grounded, anode and gas sensing
The capacitance C1 that the b pins of device B are connected, cathode is connected with the cathode of amplifier P1, and the resistance that is in parallel with capacitance C1
R3 is formed；The b pins of the gas sensor B are connected with the anode of capacitance C3, its a pin is then connected with trigger circuit.
4. a kind of soft start pouity dwelling place automatic exhaust system according to claim 3, which is characterized in that the trigger circuit by
Flip chip U, the triode pole VT1, P is connected with the output end of amplifier P2, the poles N are connected with the base stage of triode VT1
Diode D1, anode be connected with the emitter of triode VT1, the capacitance that cathode is connected with the GND pins of flip chip U
C8, anode be connected with the CONT pins of flip chip U, the capacitance C9 that cathode is connected with the cathode of capacitance C8, be serially connected in tactile
The resistance R10 between the DIS pins and TRIG pins of chip U is sent out, and anode is managed after resistance R11 with the VCC of flip chip U
The capacitance C7 compositions that foot is connected, cathode is connected after resistance R9 with the collector of triode VT1；The anode of the capacitance C7
It is connected with a pins of gas sensor B；The cathode of the capacitance C8 is connected with the cathode of amplifier P1；The capacitance C9
Cathode connect -15V voltages；The RE pins of the flip chip U are connected with its VCC pin, its THRE pin then with triode
The collector of VT1 is connected, its OUT pin is then connected with switching circuit；The cathode of the capacitance C9 also with switching circuit phase
Connection.
5. a kind of soft start pouity dwelling place automatic exhaust system according to claim 4, which is characterized in that the switching circuit by
The bidirectional thyristor pole D3, N is connected with the control terminal of bidirectional thyristor D3, the poles P are managed after resistance R12 with the OUT of flip chip U
The diode D2 that foot is connected, and the resistance that is serially connected between the second plate of bidirectional thyristor D3 and the cathode of capacitance C9
R13 is formed；The exhaust fan M is then serially connected between the first anode of bidirectional thyristor D3 and the anode of capacitance C10.
6. a kind of soft start pouity dwelling place automatic exhaust system according to claim 5, which is characterized in that the flip chip U
For NE555 integrated chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610855275.2A CN106351862B (en) | 2016-09-27 | 2016-09-27 | A kind of soft start pouity dwelling place automatic exhaust system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610855275.2A CN106351862B (en) | 2016-09-27 | 2016-09-27 | A kind of soft start pouity dwelling place automatic exhaust system |
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| CN106351862A CN106351862A (en) | 2017-01-25 |
| CN106351862B true CN106351862B (en) | 2018-09-07 |
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| CN109995354B (en) * | 2019-05-08 | 2024-04-09 | 博为科技有限公司 | Voltage fluctuation resistant delay switch circuit based on rising edge sampling |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61195026A (en) * | 1985-02-25 | 1986-08-29 | Matsushita Electric Ind Co Ltd | Mute circuit |
| CN202338502U (en) * | 2011-11-14 | 2012-07-18 | 陈彧 | Intelligent air exhausting device |
| CN104612991A (en) * | 2013-11-05 | 2015-05-13 | 成都中阔科技有限责任公司 | Automatic control device for exhaust fan of industrial waste gas treatment chamber |
| CN203643822U (en) * | 2013-12-23 | 2014-06-11 | 陕西理工学院 | Integrated device for birdhouse environmental parameter detection and regulation |
| CN104485896A (en) * | 2014-11-18 | 2015-04-01 | 无锡科思电子科技有限公司 | Low-noise amplifier circuit TR (transmitter-receiver) component with TA7505 double amplification structure |
| CN104362990A (en) * | 2014-11-18 | 2015-02-18 | 无锡科思电子科技有限公司 | TR (Transmitter and Receiver) assembly using MC1741 as power amplifier |
| CN104533824B (en) * | 2015-01-07 | 2016-02-17 | 山东科技大学 | Standardization hen house multichannel fan condition distributed wireless automatic monitoring system |
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2016
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