CN202196030U - Signal amplification circuit for water quality test and water quality detector - Google Patents
Signal amplification circuit for water quality test and water quality detector Download PDFInfo
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- CN202196030U CN202196030U CN2011201571079U CN201120157107U CN202196030U CN 202196030 U CN202196030 U CN 202196030U CN 2011201571079 U CN2011201571079 U CN 2011201571079U CN 201120157107 U CN201120157107 U CN 201120157107U CN 202196030 U CN202196030 U CN 202196030U
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Abstract
The embodiment of the utility model discloses a signal amplification circuit for water quality test and a water quality detector. The signal amplification circuit comprises a power supply supplying the signal amplification circuit, and further comprises an amplifying circuit for performing secondary amplification to the weak DC signal generated by a tested body, and a filter circuit connected between the amplifying circuit and the power supply and used for supplying the amplifying circuit after the power supply signal is subjected to filter processing. As the signal amplification circuit performing secondary amplification to the weak DC signal generated by the tested body is adopted, the technical problems of low test sensitivity and poor signal anti-interference ability in the prior art are solved; and the signal amplification circuit has the characteristics of simple structure, good performance, strong anti-interference ability and good temperature resistance, and is suitable for various environments.
Description
Technical field
The utility model relates to water quality inspection technique, relates in particular to a kind of signal amplification circuit and water quality detection device that is used for water quality detection.
Background technology
Signal amplification circuit in present signal amplification circuit such as the water quality detection device only adopts one-level to amplify for faint direct current signal, makes detection sensitivity low, the signal poor anti jamming capability.
The utility model content
The utility model embodiment technical matters to be solved is, provides a kind of weak direct current signal is carried out secondary amplification, detection sensitivity height and strong signal amplification circuit and the water quality detection device of signal antijamming capability.
In order to solve the problems of the technologies described above; On the one hand; The utility model embodiment has proposed a kind of signal amplification circuit that is used for water quality detection; Be included as the power supply of said signal amplification circuit power supply, said signal amplification circuit comprises that also the weak direct current signal that detection bodies is produced carries out the amplifying circuit of secondary processing and amplifying, and the filtering circuit that is electrically connected between said amplifying circuit and the said power supply and said power supply signal is carried out supply power for said amplifying circuit after the Filtering Processing.
Further, said filtering circuit comprises three terminal regulator 78L05, the first filter capacitor C1 and the second filter capacitor C2; Wherein, the positive pole of first pin one of said three terminal regulator 78L05 and the said first filter capacitor C1 is connected in the terminal VCC of said power supply jointly; Second pin two of said three terminal regulator 78L05 is connected in the negative pole of the said first filter capacitor C1 and the utmost point of the said second filter capacitor C2; The three-prong 3 of said three terminal regulator 78L05 is connected in another utmost point of the said second filter capacitor C2.
Further; Said amplifying circuit mainly carries out the integrated chip that secondary amplifies by at least one road signal that said detection bodies is produced to be formed, and said integrated chip by two be electrically connected each other carry out first chips that the first order amplifies respectively and second chip of second level amplification is formed;
Wherein, For said first chip: first pin is connected successively and is connected in the three-prong of said three terminal regulator behind first resistor, first capacitor and second capacitor; Said first pin also is connected in first public connecting end of the parallelly connected formation with the 3rd capacitor of second resistor; Second pin is connected in the input signal end of said detection bodies; Also be connected in second public connecting end of the parallelly connected formation with said the 3rd capacitor of said second resistor, three-prong is connected in ground terminal, also is connected in the points of common connection of said first capacitor and said second capacitor;
For said second chip: the 4th pin is connected in said three-prong and said ground terminal; The 5th pin is connected in the points of common connection of said first resistor and said first capacitor; The 6th pin is connected successively and is connected in one road output signal end behind the 3rd resistor, the 4th resistor; Said output signal end also is connected in first public connecting end of the parallelly connected formation with the 5th capacitor of the 4th capacitor; The 7th pin is connected in the points of common connection of said the 3rd resistor and said the 4th resistor; The 8th pin is connected in the three-prong of said three terminal regulator, is connected in said the 6th pin behind also connect successively the 6th capacitor and the 5th resistor, and second public connecting end of the parallelly connected formation with said the 5th capacitor of said the 4th capacitor is connected in second pin and the said ground terminal of said three terminal regulator.
On the other hand, the utility model embodiment has proposed a kind of water quality detection device, comprising: be used to produce and to the signal transmission circuit of detection bodies emitting detection signal; Aforesaid, as to be used to receive and the signal that said detection bodies produces carried out processing and amplifying signal amplification circuit.
Further, said signal transmission circuit is launched the first adjustable resistance RP1 in detection bodies after comprising the first constant current source LM334 that produces detection signal and regulating said detection signal size; Wherein, first pin one of the said first constant current source LM334 connects the terminal VCC of said power supply, and second pin two is connected in signal transmitting terminal RE and three-prong 3 after being connected in series the said first adjustable resistance RP1.
Further, said signal transmission circuit also comprises the second constant current source LM334 that produces control signal, and launches the second adjustable resistance RP2 in detection bodies after regulating said control signal size; Wherein, first pin one of the said second constant current source LM334 connects the terminal VCC of said power supply, and second pin two is connected in control signal transmitting terminal ME and three-prong 3 after being connected in series the said second adjustable resistance RP2.
The utility model embodiment adopts the weak direct current signal that detection bodies is produced to carry out the amplifying circuit of secondary processing and amplifying; Thereby it is low to have overcome the prior art detection sensitivity; The technical matters of signal poor anti jamming capability has improved detection sensitivity, signal stabilization and antijamming capability.
Description of drawings
Fig. 1 is the principle schematic of the water quality detection device circuit of the utility model embodiment.
Fig. 2 is the synoptic diagram of water quality detection device circuit shown in Figure 1.
Embodiment
The utility model embodiment provides a kind of signal amplification circuit and water quality detection device that is used for water quality detection, can realize to weak direct current signal carry out that secondary amplifies, detection sensitivity height and signal stabilization, accurately to reach antijamming capability strong.
Below in conjunction with accompanying drawing, embodiment is elaborated to the utility model.
Please refer to Fig. 1, the water quality detection device of the utility model embodiment comprises and is used to produce and to the signal transmission circuit 20 of detection bodies 10 emitting detection signals, and is used to receive and the signal that said detection bodies 10 produces carried out the signal amplification circuit 30 of processing and amplifying.
The first constant current source LM334 is used to produce detection signal RE, and the first adjustable resistance RP1 launches in said detection bodies 10 after being used to regulate said detection signal size.Wherein, first pin one of the said first constant current source LM334 connects the terminal VCC of said power supply, and second pin two is connected in signal transmitting terminal RE and three-prong 3 after being connected in series the said first adjustable resistance RP1.
The second constant current source LM334 is used to produce control signal ME, and the second adjustable resistance RP2 launches in detection bodies 10 after being used to regulate said control signal size.Wherein, first pin one of the said second constant current source LM334 connects the terminal VCC of said power supply, and second pin two is connected in control signal transmitting terminal ME and three-prong 3 after being connected in series the said second adjustable resistance RP2.
The signal amplification circuit 30 that is used for water quality detection comprises power supply 31, amplifying circuit 32 and filtering circuit 33.
Said amplifying circuit 32 is used for the weak direct current signal that detection bodies 10 produces is carried out the secondary processing and amplifying.
Said amplifying circuit 32 mainly carries out the integrated chip that secondary amplifies by at least one road signal that said detection bodies is produced to be formed, and said integrated chip by two be electrically connected each other carry out first chips that the first order amplifies respectively and second chip of second level amplification is formed;
Wherein, For the said first chip LM358: first pin one is connected successively and is connected in the three-prong 3 of said three terminal regulator 78L05 behind first resistor, first capacitor and second capacitor; Said first pin one also is connected in first public connecting end of the parallelly connected formation with the 3rd capacitor of second resistor; Second pin two is connected in the input signal end of said detection bodies; Also be connected in second public connecting end of the parallelly connected formation with said the 3rd capacitor of said second resistor, three-prong 3 is connected in ground terminal GND, also is connected in the points of common connection of said first capacitor and said second capacitor;
For the said second chip LM358: the 4th pin 4 is connected in said three-prong 3 and said ground terminal GND; The 5th pin 5 is connected in the points of common connection of said first resistor and said first capacitor; The 6th pin 6 is connected successively and is connected in one road output signal end behind the 3rd resistor, the 4th resistor; Said output signal end also is connected in first public connecting end of the parallelly connected formation with the 5th capacitor of the 4th capacitor; The 7th pin 7 is connected in the points of common connection of said the 3rd resistor and said the 4th resistor; The 8th pin 8 is connected in the three-prong 3 of said three terminal regulator 78L05; Also connecting successively is connected in said the 6th pin 6 behind the 6th capacitor and the 5th resistor, and second public connecting end of the parallelly connected formation with said the 5th capacitor of said the 4th capacitor is connected in second pin two and the said ground terminal GND of said three terminal regulator 78L05.
Please refer to Fig. 2; In this embodiment; Said amplifying circuit 32 main integrated chip A1, A2 and the A3 that carry out the secondary amplification by three three road signal D0, D1 and D2 that respectively said detection bodies 10 produced form, and the second chip LM358 that each integrated chip is amplified by two the first chip LM358 that carry out first order amplification respectively that are electrically connected each other and the second level forms;
Wherein, In the second amplifying circuit of first via signal D0; For the said first chip LM358: first pin one is connected in the three-prong 3 of said three terminal regulator 78L05 successively behind resistors in series R2, capacitor C7 and the capacitor C3; Said first pin one also is connected in first public connecting end of the parallelly connected formation with capacitor C10 of resistor R 1, and second pin two is connected in the first via input signal end D0 that said detection bodies 10 produces, and also is connected in second public connecting end of the parallelly connected formation with said capacitor C10 of said resistor R 1; Three-prong 3 is connected in ground terminal GND, also is connected in the points of common connection of said capacitor C7 and said capacitor C3;
For the said second chip LM358: the 4th pin 4 is connected in said three-prong 3 and said ground terminal GND; The 5th pin 5 is connected in the points of common connection of said resistor R 2 and said capacitor C7; The 6th pin 6 is connected in first via output signal end V0 after resistors in series R4, the resistor R 5 successively; Said first via output signal end V0 also is connected in first public connecting end of the parallelly connected formation with capacitor C9 of capacitor C8; The 7th pin 7 is connected in the points of common connection of said resistor R 4 and said resistor R 5; The 8th pin 8 is connected in the three-prong 3 of said three terminal regulator 78L05; Also be connected in said the 6th pin 6 after series capacitor C6 and the resistor R 3 successively, second public connecting end of the parallelly connected formation with said capacitor C9 of said capacitor C8 is connected in second pin two and the ground terminal GND of said three terminal regulator 78L05;
In the second amplifying circuit of the second road signal D1; For the said first chip LM358: first pin one is connected in the three-prong 3 of said three terminal regulator 78L05 successively behind resistors in series R7, capacitor C12 and the capacitor C4; Said first pin one also is connected in first public connecting end of the parallelly connected formation with capacitor C15 of resistor R 6; Second pin two is connected in the second road input signal end D1 that said detection bodies 10 produces; Also be connected in second public connecting end of the parallelly connected formation with said capacitor C15 of said resistor R 6, three-prong 3 is connected in ground terminal GND, also is connected in the points of common connection of said capacitor C4 and said capacitor C12;
For the said second chip LM358: the 4th pin 4 is connected in the three-prong 3 of said ground terminal GND and the said first chip LM358; The 5th pin 5 is connected in the points of common connection of said resistor R 7 and said capacitor C12; The 6th pin 6 is connected in the second road output signal end V1 after resistors in series R9, the resistor R 10 successively; Also be connected in first public connecting end of the parallelly connected formation of capacitor C13 with capacitor C14; The 7th pin 7 is connected in the points of common connection of said resistor R 9 and said resistor R 10; The 8th pin 8 is connected in the three-prong 3 of said three terminal regulator 78L05; Also be connected in said the 6th pin 6 after series capacitor C11 and the resistor R 8 successively, second public connecting end of the parallelly connected formation with said capacitor C14 of said capacitor C13 is connected in said resistor R 8 and said capacitor C11 points of common connection and ground terminal GND;
In the second amplifying circuit of Third Road signal D2; For the said first chip LM358: first pin one is connected in the three-prong 3 of said three terminal regulator 78L05 successively behind resistors in series R12, capacitor C17 and the capacitor C5; Said first pin one also is connected in first public connecting end of the parallelly connected formation with capacitor C20 of resistor R 11; Second pin two is connected in the Third Road input signal end D2 that said detection bodies 10 produces; Also be connected in second public connecting end of the parallelly connected formation with said capacitor C20 of said resistor R 11, three-prong 3 is connected in ground terminal GND;
For the said second chip LM358: the 4th pin 4 is connected in the three-prong 3 of said ground terminal GND and the said first chip LM358; The 5th pin 5 is connected in the points of common connection of said resistor R 12 and said capacitor C17; The 6th pin 6 is connected in Third Road output signal end V2 after resistors in series R14, the resistor R 15 successively; Said Third Road output signal end V2 also is connected in first public connecting end of the parallelly connected formation with capacitor C19 of capacitor C18; The 7th pin 7 is connected in the points of common connection of said resistor R 14 and said resistor R 15; The 8th pin 8 is connected in the three-prong 3 of said three terminal regulator 78L05; Also be connected in said the 6th pin 6 after series capacitor C16 and the resistor R 13 successively, second public connecting end of the parallelly connected formation with said capacitor C19 of said capacitor C18 is connected in said resistor R 13 and said capacitor C16 points of common connection and ground terminal GND.
The above is the embodiment of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also are regarded as the protection domain of the utility model.
Claims (6)
1. signal amplification circuit that is used for water quality detection; Be included as the power supply of said signal amplification circuit power supply; It is characterized in that; Said signal amplification circuit comprises that also the weak direct current signal that detection bodies is produced carries out the amplifying circuit of secondary processing and amplifying, and the filtering circuit that is electrically connected between said amplifying circuit and the said power supply and said power supply signal is carried out supply power for said amplifying circuit after the Filtering Processing.
2. signal amplification circuit as claimed in claim 1 is characterized in that, said filtering circuit comprises three terminal regulator 78L05, first filter capacitor (C1) and second filter capacitor (C2);
Wherein, the positive pole of first pin (1) of said three terminal regulator 78L05 and said first filter capacitor (C1) is connected in the terminal (VCC) of said power supply jointly; Second pin (2) of said three terminal regulator 78L05 is connected in the negative pole of said first filter capacitor (C1) and a utmost point of said second filter capacitor (C2); The three-prong (3) of said three terminal regulator 78L05 is connected in another utmost point of said second filter capacitor (C2).
3. signal amplification circuit as claimed in claim 2; It is characterized in that; Said amplifying circuit mainly carries out the integrated chip that secondary amplifies by at least one road signal that said detection bodies is produced to be formed, and said integrated chip by two be electrically connected each other carry out first chips that the first order amplifies respectively and second chip of second level amplification is formed;
Wherein, For said first chip: first pin is connected successively and is connected in the three-prong of said three terminal regulator behind first resistor, first capacitor and second capacitor; Said first pin also is connected in first public connecting end of the parallelly connected formation with the 3rd capacitor of second resistor; Second pin is connected in the input signal end of said detection bodies; Also be connected in second public connecting end of the parallelly connected formation with said the 3rd capacitor of said second resistor, three-prong is connected in ground terminal, also is connected in the points of common connection of said first capacitor and said second capacitor;
For said second chip: the 4th pin is connected in said three-prong and said ground terminal; The 5th pin is connected in the points of common connection of said first resistor and said first capacitor; The 6th pin is connected successively and is connected in one road output signal end behind the 3rd resistor, the 4th resistor; Said output signal end also is connected in first public connecting end of the parallelly connected formation with the 5th capacitor of the 4th capacitor; The 7th pin is connected in the points of common connection of said the 3rd resistor and said the 4th resistor; The 8th pin is connected in the three-prong of said three terminal regulator, is connected in said the 6th pin behind also connect successively the 6th capacitor and the 5th resistor, and second public connecting end of the parallelly connected formation with said the 5th capacitor of said the 4th capacitor is connected in second pin and the said ground terminal of said three terminal regulator.
4. a water quality detection device is characterized in that, said water quality detection device comprises:
Be used to produce and to the signal transmission circuit of detection bodies emitting detection signal;
As each is described in the claim 1～3, be used to receive and the signal that said detection bodies produces carried out the signal amplification circuit of processing and amplifying.
5. water quality detection device as claimed in claim 4 is characterized in that, said signal transmission circuit is launched first adjustable resistance (RP1) in detection bodies after comprising the first constant current source LM334 that produces detection signal and regulating said detection signal size; Wherein, first pin (1) of the said first constant current source LM334 connects the terminal (VCC) of said power supply, is connected in signal transmitting terminal (RE) and three-prong (3) behind second pin (2) said first adjustable resistance of serial connection (RP1).
6. water quality detection device as claimed in claim 4 is characterized in that, said signal transmission circuit also comprises the second constant current source LM334 that produces control signal, and launches second adjustable resistance (RP2) in detection bodies after regulating said control signal size; Wherein, first pin (1) of the said second constant current source LM334 connects the terminal (VCC) of said power supply, is connected in control signal transmitting terminal (ME) and three-prong (3) behind second pin (2) said second adjustable resistance of serial connection (RP2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201571079U CN202196030U (en) | 2011-05-17 | 2011-05-17 | Signal amplification circuit for water quality test and water quality detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201571079U CN202196030U (en) | 2011-05-17 | 2011-05-17 | Signal amplification circuit for water quality test and water quality detector |
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| Publication Number | Publication Date |
|---|---|
| CN202196030U true CN202196030U (en) | 2012-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201571079U Expired - Lifetime CN202196030U (en) | 2011-05-17 | 2011-05-17 | Signal amplification circuit for water quality test and water quality detector |
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| Country | Link |
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| CN (1) | CN202196030U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067669A (en) * | 2015-06-30 | 2015-11-18 | 佛山市云米电器科技有限公司 | Detection circuit, detection apparatus and detection method |
| CN106911311A (en) * | 2017-01-18 | 2017-06-30 | 广西师范学院 | For the signal amplification circuit of water quality monitoring |
-
2011
- 2011-05-17 CN CN2011201571079U patent/CN202196030U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067669A (en) * | 2015-06-30 | 2015-11-18 | 佛山市云米电器科技有限公司 | Detection circuit, detection apparatus and detection method |
| CN106911311A (en) * | 2017-01-18 | 2017-06-30 | 广西师范学院 | For the signal amplification circuit of water quality monitoring |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120418 |
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| CX01 | Expiry of patent term |