CN106849902A - A kind of multi-stage filter circuit - Google Patents
A kind of multi-stage filter circuit Download PDFInfo
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- CN106849902A CN106849902A CN201611230548.0A CN201611230548A CN106849902A CN 106849902 A CN106849902 A CN 106849902A CN 201611230548 A CN201611230548 A CN 201611230548A CN 106849902 A CN106849902 A CN 106849902A
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- resistance
- electric capacity
- amplifier
- connect
- potentiometer
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/38—One-way transmission networks, i.e. unilines
Abstract
The present invention discloses a kind of multi-stage filter circuit, good sensitivity is obtained by the cooperation of multilevel amplifiers, enter in audio signal and fashionable filtered to being mixed into various interference noises therein, it ensures the validity and anti-tampering property of filtering by setting a good narrow-band bandpass, and low side and high-end cut-off frequency are adjusted by potentiometer, hum can also be suppressed, bad signal and interfering noise be eliminated, so as to improve the anti-noise ability of circuit.
Description
Technical field
The present invention relates to filter field, and in particular to a kind of multi-stage filter circuit.
Background technology
With developing rapidly for science and technology, with the electronic product that audio-frequency information is transmitted, more and more enter ours
Production, life and various social activitieies practice.To the quality requirement of the audio-frequency information for being transmitted, particularly voice messaging
More and more higher；Any error of crucial language in important social activities can cause irredeemable heavy losses；However, using
The randomness of occasion is unforeseen, and incident noise jamming brings worried and inconvenience several to high-quality voice messaging
Cannot overcome；And audio signal is highly susceptible to various interference in transmitting procedure, it is felt to be desirable to from audio letter
Number collection source on improve enter Transmission system anti-noise ability, with improve communication, pass on information quality and effect.
The content of the invention
The purpose of the present invention is a kind of multi-stage filter circuit that multistage filtering interfering is carried out to audio signal.
The present invention is achieved through the following technical solutions：A kind of multi-stage filter circuit, including input port, output port,
One resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th electricity
Resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 15th resistance, the 16th electricity
Resistance, the 17th resistance, the 18th resistance, the 19th resistance, the 20th resistance, the 21st resistance, the 22nd resistance, second
13 resistance, the 24th resistance, the 25th resistance, the 26th resistance, the 27th resistance, the 28th resistance,
One electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electricity
Appearance, the tenth electric capacity, the 11st electric capacity, the 12nd electric capacity, the 13rd electric capacity, the 14th electric capacity, the 15th electric capacity, the 16th electricity
Appearance, the 17th electric capacity, the 18th electric capacity, the 19th electric capacity, the 20th electric capacity, the 21st electric capacity, the first potentiometer, the second electricity
Position device, the 3rd potentiometer, the 4th potentiometer, the 5th potentiometer, the first triode, the second triode, the first amplifier, the second fortune
Put, the 3rd amplifier, four high guaily unit, the 5th amplifier；The input port connects one end of the first electric capacity, first electric capacity it is another
One end connects one end and variable resistance end of the first potentiometer, and the other end of first electric capacity is additionally coupled to one end of the second electric capacity,
The other end of first potentiometer connects one end of first resistor, and the other end of the first resistor is connected to the first amplifier
Negative input end, the negative input end of first amplifier is connected to the output end of the first amplifier, and the other end of second electric capacity connects
The positive input terminal of the first amplifier is connected to, the positive input terminal of first amplifier is additionally coupled to one end of the second potentiometer, described
The variable resistance end of two potentiometers and the other end are connected with each other and are connected to one end of second resistance, and the output end of first amplifier is also
Connect one end of the 3rd electric capacity, the other end of the 3rd electric capacity connects one end of 3rd resistor, the 3rd resistor it is another
The other end of end and second resistance is all grounded, and the other end of the 3rd electric capacity is also connected with one end of the 4th resistance, the described 4th
The other end of resistance is also connected with one end of the 3rd potentiometer, and the variable resistance end of the 3rd potentiometer and the other end are connected with each other and connect
One end of the 4th electric capacity is connected to, the other end of the 4th electric capacity is connected to the negative input end of the second amplifier, the 4th electric capacity
One end be also connected with one end of the 4th potentiometer, the variable resistance end of the 4th potentiometer and the other end are connected with each other and are connected to
One end of five resistance, the other end of the 5th resistance connects one end of the 5th electric capacity, and the other end of the 5th electric capacity is grounded,
One end of 5th electric capacity is also connected with the positive input terminal of the second amplifier, and the negative input end of second amplifier is additionally coupled to second
The output end of amplifier, the output end of second amplifier is also connected with one end of the 6th electric capacity, another termination of the 6th electric capacity
Ground, one end of the 6th electric capacity is also connected with one end of the 7th electric capacity, and the other end of the 7th electric capacity connects the 6th resistance
One end, the other end of the 6th resistance connects one end of the 7th resistance, and the other end of the 7th resistance connects the 8th electric capacity
One end, the other end of the 8th electric capacity connects one end of the 8th resistance, the other end ground connection of the 8th resistance, described the
The other end of eight electric capacity is additionally coupled to the base stage of the first triode, and the base stage of first triode is also connected with the one of the 9th resistance
End, the other end of the 9th resistance connects one end of the tenth resistance, and the other end of the tenth resistance connects the first triode
Colelctor electrode, the emitter stage of first triode connects one end of the 11st resistance, another termination of the 11st resistance
Ground, the electric capacity of the 11st resistor coupled in parallel the 9th, the colelctor electrode of first triode is also connected with one end of the tenth electric capacity, described
The other end of the tenth electric capacity connects one end of the 12nd resistance, and the other end of the 12nd resistance connects the one of the tenth resistance
End, the other end of 12 resistance is also connected with one end of the 14th resistance, and one end of the 14th resistance is also connected with VCC electricity
Source, the other end of the 14th resistance connects the colelctor electrode of the second triode, and the other end of the tenth electric capacity is also connected with the
The base stage of two triodes, the base stage of second triode is also connected with one end of the 13rd resistance, the hair of second triode
The other end of one end of emitter-base bandgap grading the 15th resistance of connection, the 15th resistance and the 13rd resistance is all grounded, and the described 15th
The colelctor electrode that resistor coupled in parallel has the 11st electric capacity, second triode is also connected with one end of the 12nd electric capacity, the described 12nd
One end of electric capacity is also connected with one end of the 18th resistance, and the other end of the 12nd electric capacity connects one end of the 16th resistance,
The other end of the 16th resistance connects one end of the 5th potentiometer, and one end of the 16th resistance is also connected with the 13rd electricity
One end of appearance, the other end of the 13rd electric capacity connects one end of the 17th resistance, and the other end of the 17th resistance connects
The other end of the 5th potentiometer is connect, one end of the 17th resistance is also connected with one end of the 14th electric capacity, the 14th electricity
The other end of appearance connects the other end of the 18th resistance, and the other end of the 18th resistance is additionally coupled to the just defeated of the 3rd amplifier
Enter end, the negative input end of the 3rd amplifier is connected to the output end of the 3rd amplifier, the variable resistance end connection of the 5th potentiometer
One end of 19th resistance, the other end ground connection of the 19th resistance, one end of the 19th resistance is also connected with the 20th
One end of eight resistance, the other end of the 28th resistance is connected to the output end of the 3rd amplifier, the 3rd amplifier it is defeated
Go out one end that end is also connected with the 20th electric capacity, the other end of the 20th electric capacity is grounded, and one end of the 20th electric capacity is also
One end of the 20th resistance is connected, the other end of the 20th resistance connects one end of the 15th electric capacity, the 15th electricity
One end of appearance is also connected with one end of the 21st resistance, and the other end of the 21st resistance connects the one of the 16th electric capacity
End, one end of the 16th electric capacity is also connected with the positive input terminal of four high guaily unit, the negative input end connection of the four high guaily unit the
The other end of one end of 22 resistance, the 22nd resistance and the 16th electric capacity is all grounded, the four high guaily unit it is negative
Input is also connected with one end of the 23rd resistance, and the other end of the 23rd resistance connects the another of the 15th electric capacity
End, the other end of the 23rd resistance is additionally coupled to the output end of four high guaily unit, and the output end of the four high guaily unit also connects
Connect one end of the 17th electric capacity, the other end ground connection of the 17th electric capacity, one end of the 17th electric capacity is additionally coupled to the
One end of 24 resistance, the other end of the 24th resistance connects one end of the 25th resistance, the described 25th
One end of resistance is also connected with one end of the 18th electric capacity, and the other end of the 25th resistance connects the one of the 19th electric capacity
End, one end of the 19th electric capacity is also connected with the positive input terminal of the 5th amplifier, and the negative input end of the 5th amplifier is also connected with
The other end of one end of the 26th resistance, the 26th resistance and the 19th electric capacity is all grounded, the 5th amplifier
Negative input end is also connected with one end of the 27th resistance, and the other end of the 27th resistance is connected to the another of the 18th electric capacity
One end, the other end of the 27th resistance is additionally coupled to the output end of the 5th amplifier, and the output end of the 5th amplifier connects
One end of the 21st electric capacity is connect, the other end of the 21st electric capacity is grounded, and one end of the 21st electric capacity also connects
Meet output port Vout；The positive supply terminals connection V+ power supplys of first amplifier, the negative supply wiring of first amplifier
End connection V- power supplys；The positive supply terminals connection V+ power supplys of second amplifier, the negative supply terminals of second amplifier
Connection V- power supplys；The positive supply terminals connection V+ power supplys of the 3rd amplifier, the negative supply terminals of the 3rd amplifier connect
Connect V- power supplys；The positive supply terminals connection V+ power supplys of the four high guaily unit, the negative supply terminals connection of the four high guaily unit
V- power supplys；The positive supply terminals connection V+ power supplys of the 5th amplifier, the negative supply terminals connection V- of the 5th amplifier
Power supply.
The present invention obtains good sensitivity by the cooperation of multilevel amplifiers, enters fashionable therein to being mixed into audio signal
Various interference noises are filtered, and it ensures the validity and anti-tampering of filtering by setting a good narrow-band bandpass
Property, and low side and high-end cut-off frequency are adjusted by potentiometer, moreover it is possible to hum is suppressed, bad signal is eliminated
And interfering noise, so as to improve the anti-noise ability of circuit.
The present invention is advantageous in that：1）Hum can be suppressed, eliminate bad signal and interfering noise；2）If
The anti-noise ability for determining a good narrow-band bandpass to ensure the validity and anti-tampering property of filtering so as to improve circuit；3）Pass through
Potentiometer adjusts low side and high-end cut-off frequency setting band logical.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings with specific embodiment, the invention will be further described.
See Fig. 1, a kind of multi-stage filter circuit, including input port Vin, output port Vout, first resistor R1, the second electricity
Resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th electricity
Resistance R9, the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, the tenth
Five resistance R15, the 16th resistance R16, the 17th resistance R17, the 18th resistance R18, the 19th resistance R19, the 20th resistance
R20, the 21st resistance R21, the 22nd resistance R22, the 23rd resistance R23, the 24th resistance R24, the 25th
Resistance R25, the 26th resistance R26, the 27th resistance R27, the 28th resistance R28, the first electric capacity C1, the second electric capacity
C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity
C9, the tenth electric capacity C10, the 11st electric capacity C11, the 12nd electric capacity C12, the 13rd electric capacity C13, the 14th electric capacity C14, the 15th
Electric capacity C15, the 16th electric capacity C16, the 17th electric capacity C17, the 18th electric capacity C18, the 19th electric capacity C19, the 20th electric capacity
C20, the 21st electric capacity C21, the first potentiometer RW1, the second potentiometer RW2, the 3rd potentiometer RW3, the 4th potentiometer RW4,
5th potentiometer RW5, the first triode Q1, the second triode Q2, the first amplifier U1, the second amplifier U2, the 3rd amplifier U3, the 4th
Amplifier U4, the 5th amplifier U5；The input port Vin connects one end of the first electric capacity C1, the other end of the first electric capacity C1
One end and variable resistance end of the first potentiometer RW1 is connected, the other end of the first electric capacity C1 is additionally coupled to the one of the second electric capacity C2
End, one end of the other end connection first resistor R1 of the first potentiometer RW1, the other end of the first resistor R1 is connected to
The negative input end of the first amplifier U1, the negative input end of the first amplifier U1 is connected to the output end of the first amplifier U1, described
The other end of two electric capacity C2 is connected to the positive input terminal of the first amplifier U1, and the positive input terminal of the first amplifier U1 is additionally coupled to
One end of two potentiometer RW2, the variable resistance end of the second potentiometer RW2 and the other end are connected with each other and are connected to second resistance R2
One end, the output end of the first amplifier U1 is also connected with one end of the 3rd electric capacity C3, and the other end of the 3rd electric capacity C3 connects
One end of 3rd resistor R3 is connect, the other end of the 3rd resistor R3 and the other end of second resistance R2 are all grounded, the described 3rd
The other end of electric capacity C3 is also connected with one end of the 4th resistance R4, and the other end of the 4th resistance R4 is also connected with the 3rd potentiometer
One end of RW3, the variable resistance end of the 3rd potentiometer RW3 and the other end are connected with each other and are connected to one end of the 4th electric capacity C4,
The other end of the 4th electric capacity C4 is connected to the negative input end of the second amplifier U2, and one end of the 4th electric capacity C4 is also connected with
One end of four potentiometer RW4, the variable resistance end of the 4th potentiometer RW4 and the other end are connected with each other and are connected to the 5th resistance R5
One end, the other end of the 5th resistance R5 connects one end of the 5th electric capacity C5, the other end ground connection of the 5th electric capacity C5,
One end of the 5th electric capacity C5 is also connected with the positive input terminal of the second amplifier U2, and the negative input end of the second amplifier U2 is also connected with
To the output end of the second amplifier U2, the output end of the second amplifier U2 is also connected with one end of the 6th electric capacity C6, the 6th electricity
Hold the other end ground connection of C6, one end of the 6th electric capacity C6 is also connected with one end of the 7th electric capacity C7, the 7th electric capacity C7's
The other end connects one end of the 6th resistance R6, and the other end of the 6th resistance R6 connects one end of the 7th resistance R7, and described the
The other end of seven resistance R7 connects one end of the 8th electric capacity C8, and the other end of the 8th electric capacity C8 connects the one of the 8th resistance R8
End, the other end ground connection of the 8th resistance R8, the other end of the 8th electric capacity C8 is additionally coupled to the base of the first triode Q1
Pole, the base stage of the first triode Q1 is also connected with one end of the 9th resistance R9, the other end connection of the 9th resistance R9 the
One end of ten resistance R10, the other end of the tenth resistance R10 connects the colelctor electrode of the first triode Q1, the one or three pole
The emitter stage of pipe Q1 connects one end of the 11st resistance R11, the other end ground connection of the 11st resistance R11, the described 11st
The colelctor electrode of resistance R11 parallel connections the 9th electric capacity C9, the first triode Q1 is also connected with one end of the tenth electric capacity C10, described
The other end of ten electric capacity C10 connects one end of the 12nd resistance R12, the electricity of other end connection the tenth of the 12nd resistance R12
One end of R10 is hindered, the other end of the 12 resistance R12 is also connected with one end of the 14th resistance R14, the 14th resistance
One end of R14 is also connected with VCC power supplys, and the other end of the 14th resistance R14 connects the colelctor electrode of the second triode Q2, described
The other end of the tenth electric capacity C10 is also connected with the base stage of the second triode Q2, and the base stage of the second triode Q2 is also connected with the tenth
One end of three resistance R13, the emitter stage of the second triode Q2 connects one end of the 15th resistance R15, the 15th electricity
The other end for hindering R15 and the 13rd resistance R13 is all grounded, and the 15th resistance R15 is parallel with the 11st electric capacity C11, described
The colelctor electrode of the second triode Q2 is also connected with one end of the 12nd electric capacity C12, and one end of the 12nd electric capacity C12 is also connected with
One end of 18 resistance R18, the other end of the 12nd electric capacity C12 connects one end of the 16th resistance R16, the described 16th
The other end of resistance R16 connects one end of the 5th potentiometer RW5, and one end of the 16th resistance R16 is also connected with the 13rd electricity
Hold one end of C13, the other end of the 13rd electric capacity C13 connects one end of the 17th resistance R17, the 17th resistance
The other end of R17 connects the other end of the 5th potentiometer RW5, and one end of the 17th resistance R17 is also connected with the 14th electric capacity
One end of C14, the other end of the 14th electric capacity C14 connects the other end of the 18th resistance R18, the 18th resistance
The other end of R18 is additionally coupled to the positive input terminal of the 3rd amplifier U3, and the negative input end of the 3rd amplifier U3 is connected to the 3rd fortune
The output end of U3 is put, the variable resistance end of the 5th potentiometer RW5 connects one end of the 19th resistance R19, the 19th resistance
The other end ground connection of R19, one end of the 19th resistance R19 is also connected with one end of the 28th resistance R28, the described 20th
The other end of eight resistance R28 is connected to the output end of the 3rd amplifier U3, and the output end of the 3rd amplifier U3 is also connected with the 20th
One end of electric capacity C20, the other end ground connection of the 20th electric capacity C20, one end of the 20th electric capacity C20 is also connected with second
One end of ten resistance R20, the other end of the 20th resistance R20 connects one end of the 15th electric capacity C15, the 15th electricity
The one end for holding C15 is also connected with one end of the 21st resistance R21, the other end connection the 16th of the 21st resistance R21
One end of electric capacity C16, one end of the 16th electric capacity C16 is also connected with the positive input terminal of four high guaily unit U4, the four high guaily unit
The negative input end of U4 connects one end of the 22nd resistance R22, and the 22nd resistance R22's and the 16th electric capacity C16 is another
One end is all grounded, and the negative input end of the four high guaily unit U4 is also connected with one end of the 23rd resistance R23, the 23rd electricity
The other end for hindering R23 connects the other end of the 15th electric capacity C15, and the other end of the 23rd resistance R23 is additionally coupled to the
The output end of four high guaily unit U4, the output end of the four high guaily unit U4 is also connected with one end of the 17th electric capacity C17, the 17th electricity
Hold the other end ground connection of C17, one end of the 17th electric capacity C17 is additionally coupled to one end of the 24th resistance R24, described the
The other end of 24 resistance R24 connects one end of the 25th resistance R25, and one end of the 25th resistance R25 also connects
One end of the 18th electric capacity C18 is connect, the other end of the 25th resistance R25 connects one end of the 19th electric capacity C19, described
One end of 19th electric capacity C19 is also connected with the positive input terminal of the 5th amplifier U5, and the negative input end of the 5th amplifier U5 is also connected with
One end of 26th resistance R26, the other end of the 26th resistance R26 and the 19th electric capacity C19 is all grounded, and described
The negative input end of five amplifier U5 is also connected with one end of the 27th resistance R27, the other end connection of the 27th resistance R27
To the other end of the 18th electric capacity C18, the other end of the 27th resistance R27 is additionally coupled to the output of the 5th amplifier U5
End, the output end of the 5th amplifier U5 connects one end of the 21st electric capacity C21, and the 21st electric capacity C21's is another
End ground connection, one end of the 21st electric capacity C21 is also connected with output port Vout；The positive supply wiring of the first amplifier U1
End connection V+ power supplys, the negative supply terminals connection V- power supplys of the first amplifier U1；The positive supply of the second amplifier U2 connects
Line end connects V+ power supplys, the negative supply terminals connection V- power supplys of the second amplifier U2；The positive supply of the 3rd amplifier U3
Terminals connect V+ power supplys, the negative supply terminals connection V- power supplys of the 3rd amplifier U3；The positive electricity of the four high guaily unit U4
Source terminals connection V+ power supplys, the negative supply terminals connection V- power supplys of the four high guaily unit U4；The 5th amplifier U5 is just
Supply terminals connects V+ power supplys, the negative supply terminals connection V- power supplys of the 5th amplifier U5.
In present embodiment, the band logical of low side that signal is adjusted by potentiometer and high end cut-off frequencies setting realizes the
One-level is leached, then ensures the good narrow degree of bandwidth by the combination of multilevel amplifiers and feedback circuit, so as to ensure signal
Quality, leaches the noise of wherein audio signal, and hum is suppressed, and bad signal and interfering noise is eliminated, so as to improve
The anti-noise ability and anti-interference of whole circuit, improve the quality of audio signal, and lifting is applied to the globality of the circuit product
Energy.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims
Be defined, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement each fall within it is of the invention
Protection domain.
Claims (2)
1. a kind of multi-stage filter circuit, it is characterised in that：Including input port（Vin）, output port（Vout）, first resistor
（R1）, second resistance（R2）, 3rd resistor（R3）, the 4th resistance（R4）, the 5th resistance（R5）, the 6th resistance（R6）, the 7th electricity
Resistance（R7）, the 8th resistance（R8）, the 9th resistance（R9）, the tenth resistance（R10）, the 11st resistance（R11）, the 12nd resistance
（R12）, the 13rd resistance（R13）, the 14th resistance（R14）, the 15th resistance（R15）, the 16th resistance（R16）, the 17th
Resistance（R17）, the 18th resistance（R18）, the 19th resistance（R19）, the 20th resistance（R20）, the 21st resistance（R21）、
22nd resistance（R22）, the 23rd resistance（R23）, the 24th resistance（R24）, the 25th resistance（R25）, second
16 resistance（R26）, the 27th resistance（R27）, the 28th resistance（R28）, the first electric capacity（C1）, the second electric capacity（C2）、
3rd electric capacity（C3）, the 4th electric capacity（C4）, the 5th electric capacity（C5）, the 6th electric capacity（C6）, the 7th electric capacity（C7）, the 8th electric capacity
（C8）, the 9th electric capacity（C9）, the tenth electric capacity（C10）, the 11st electric capacity（C11）, the 12nd electric capacity（C12）, the 13rd electric capacity
（C13）, the 14th electric capacity（C14）, the 15th electric capacity（C15）, the 16th electric capacity（C16）, the 17th electric capacity（C17）, the 18th
Electric capacity（C18）, the 19th electric capacity（C19）, the 20th electric capacity（C20）, the 21st electric capacity（C21）, the first potentiometer（RW1）、
Second potentiometer（RW2）, the 3rd potentiometer（RW3）, the 4th potentiometer（RW4）, the 5th potentiometer（RW5）, the first triode
（Q1）, the second triode（Q2）, the first amplifier（U1）, the second amplifier（U2）, the 3rd amplifier（U3）, four high guaily unit（U4）, the 5th
Amplifier（U5）；The input port（Vin）Connect the first electric capacity（C1）One end, first electric capacity（C1）The other end connection
First potentiometer（RW1）One end and variable resistance end, first electric capacity（C1）The other end be additionally coupled to the second electric capacity（C2）'s
One end, first potentiometer（RW1）The other end connection first resistor（R1）One end, the first resistor（R1）It is another
End is connected to the first amplifier（U1）Negative input end, first amplifier（U1）Negative input end be connected to the first amplifier（U1）'s
Output end, second electric capacity（C2）The other end be connected to the first amplifier（U1）Positive input terminal, first amplifier（U1）
Positive input terminal be additionally coupled to the second potentiometer（RW2）One end, second potentiometer（RW2）Variable resistance end and other end phase
Connect and be connected to second resistance（R2）One end, first amplifier（U1）Output end be also connected with the 3rd electric capacity（C3）'s
One end, the 3rd electric capacity（C3）The other end connection 3rd resistor（R3）One end, the 3rd resistor（R3）The other end
And second resistance（R2）The other end be all grounded, the 3rd electric capacity（C3）The other end be also connected with the 4th resistance（R4）One
End, the 4th resistance（R4）The other end be also connected with the 3rd potentiometer（RW3）One end, the 3rd potentiometer（RW3）'s
Variable resistance end and the other end are connected with each other and are connected to the 4th electric capacity（C4）One end, the 4th electric capacity（C4）The other end connection
To the second amplifier（U2）Negative input end, the 4th electric capacity（C4）One end be also connected with the 4th potentiometer（RW4）One end, institute
State the 4th potentiometer（RW4）Variable resistance end and the other end be connected with each other and be connected to the 5th resistance（R5）One end, the described 5th
Resistance（R5）The other end connect the 5th electric capacity（C5）One end, the 5th electric capacity（C5）The other end ground connection, the described 5th
Electric capacity（C5）One end be also connected with the second amplifier（U2）Positive input terminal, second amplifier（U2）Negative input end be additionally coupled to
Second amplifier（U2）Output end, second amplifier（U2）Output end be also connected with the 6th electric capacity（C6）One end, described
Six electric capacity（C6）The other end ground connection, the 6th electric capacity（C6）One end be also connected with the 7th electric capacity（C7）One end, described
Seven electric capacity（C7）The other end connect the 6th resistance（R6）One end, the 6th resistance（R6）The other end connect the 7th resistance
（R7）One end, the 7th resistance（R7）The other end connect the 8th electric capacity（C8）One end, the 8th electric capacity（C8）'s
The other end connects the 8th resistance（R8）One end, the 8th resistance（R8）The other end ground connection, the 8th electric capacity（C8）'s
The other end is additionally coupled to the first triode（Q1）Base stage, first triode（Q1）Base stage be also connected with the 9th resistance（R9）
One end, the 9th resistance（R9）The other end connect the tenth resistance（R10）One end, the tenth resistance（R10）It is another
One end connects the first triode（Q1）Colelctor electrode, first triode（Q1）Emitter stage connect the 11st resistance（R11）
One end, the 11st resistance（R11）The other end ground connection, the 11st resistance（R11）9th electric capacity in parallel（C9）, institute
State the first triode（Q1）Colelctor electrode be also connected with the tenth electric capacity（C10）One end, the tenth electric capacity（C10）The other end connect
Connect the 12nd resistance（R12）One end, the 12nd resistance（R12）The other end connect the tenth resistance（R10）One end, institute
State 12 resistance（R12）The other end be also connected with the 14th resistance（R14）One end, the 14th resistance（R14）One end
It is also connected with VCC power supplys, the 14th resistance（R14）The other end connect the second triode（Q2）Colelctor electrode, the described tenth
Electric capacity（C10）The other end be also connected with the second triode（Q2）Base stage, second triode（Q2）Base stage be also connected with
13 resistance（R13）One end, second triode（Q2）Emitter stage connect the 15th resistance（R15）One end, it is described
15th resistance（R15）With the 13rd resistance（R13）The other end be all grounded, the 15th resistance（R15）It is parallel with the tenth
One electric capacity（C11）, second triode（Q2）Colelctor electrode be also connected with the 12nd electric capacity（C12）One end, the described 12nd
Electric capacity（C12）One end be also connected with the 18th resistance（R18）One end, the 12nd electric capacity（C12）Other end connection the
16 resistance（R16）One end, the 16th resistance（R16）The other end connect the 5th potentiometer（RW5）One end, it is described
16th resistance（R16）One end be also connected with the 13rd electric capacity（C13）One end, the 13rd electric capacity（C13）The other end
Connect the 17th resistance（R17）One end, the 17th resistance（R17）The other end connect the 5th potentiometer（RW5）It is another
One end, the 17th resistance（R17）One end be also connected with the 14th electric capacity（C14）One end, the 14th electric capacity（C14）
The other end connect the 18th resistance（R18）The other end, the 18th resistance（R18）The other end be additionally coupled to the 3rd fortune
Put（U3）Positive input terminal, the 3rd amplifier（U3）Negative input end be connected to the 3rd amplifier（U3）Output end, described
Five potentiometers（RW5）Variable resistance end connect the 19th resistance（R19）One end, the 19th resistance（R19）Another termination
Ground, the 19th resistance（R19）One end be also connected with the 28th resistance（R28）One end, the 28th resistance
（R28）The other end be connected to the 3rd amplifier（U3）Output end, the 3rd amplifier（U3）Output end be also connected with the 20th
Electric capacity（C20）One end, the 20th electric capacity（C20）The other end ground connection, the 20th electric capacity（C20）One end also connect
Connect the 20th resistance（R20）One end, the 20th resistance（R20）The other end connect the 15th electric capacity（C15）One end,
15th electric capacity（C15）One end be also connected with the 21st resistance（R21）One end, the 21st resistance（R21）
The other end connect the 16th electric capacity（C16）One end, the 16th electric capacity（C16）One end be also connected with four high guaily unit（U4）
Positive input terminal, the four high guaily unit（U4）Negative input end connect the 22nd resistance（R22）One end, the described 22nd
Resistance（R22）With the 16th electric capacity（C16）The other end be all grounded, the four high guaily unit（U4）Negative input end be also connected with second
13 resistance（R23）One end, the 23rd resistance（R23）The other end connect the 15th electric capacity（C15）The other end,
23rd resistance（R23）The other end be additionally coupled to four high guaily unit（U4）Output end, the four high guaily unit（U4）'s
Output end is also connected with the 17th electric capacity（C17）One end, the 17th electric capacity（C17）The other end ground connection, the described 17th
Electric capacity（C17）One end be additionally coupled to the 24th resistance（R24）One end, the 24th resistance（R24）The other end
Connect the 25th resistance（R25）One end, the 25th resistance（R25）One end be also connected with the 18th electric capacity（C18）
One end, the 25th resistance（R25）The other end connect the 19th electric capacity（C19）One end, the 19th electric capacity
（C19）One end be also connected with the 5th amplifier（U5）Positive input terminal, the 5th amplifier（U5）Negative input end be also connected with second
16 resistance（R26）One end, the 26th resistance（R26）With the 19th electric capacity（C19）The other end be all grounded, it is described
5th amplifier（U5）Negative input end be also connected with the 27th resistance（R27）One end, the 27th resistance（R27）It is another
One end is connected to the 18th electric capacity（C18）The other end, the 27th resistance（R27）The other end be additionally coupled to the 5th fortune
Put（U5）Output end, the 5th amplifier（U5）Output end connect the 21st electric capacity（C21）One end, the described 20th
One electric capacity（C21）The other end ground connection, the 21st electric capacity（C21）One end be also connected with output port（Vout）.
2. a kind of multi-stage filter circuit according to claim 1, it is characterised in that：First amplifier（U1）Positive supply
Terminals connect V+ power supplys, first amplifier（U1）Negative supply terminals connection V- power supplys；Second amplifier（U2）'s
Positive supply terminals connect V+ power supplys, second amplifier（U2）Negative supply terminals connection V- power supplys；3rd amplifier
（U3）Positive supply terminals connection V+ power supplys, the 3rd amplifier（U3）Negative supply terminals connection V- power supplys；Described
Four high guaily unit（U4）Positive supply terminals connection V+ power supplys, the four high guaily unit（U4）Negative supply terminals connection V- power supplys；
5th amplifier（U5）Positive supply terminals connection V+ power supplys, the 5th amplifier（U5）Negative supply terminals connection V-
Power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611230548.0A CN106849902A (en) | 2016-12-28 | 2016-12-28 | A kind of multi-stage filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611230548.0A CN106849902A (en) | 2016-12-28 | 2016-12-28 | A kind of multi-stage filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106849902A true CN106849902A (en) | 2017-06-13 |
Family
ID=59113378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611230548.0A Pending CN106849902A (en) | 2016-12-28 | 2016-12-28 | A kind of multi-stage filter circuit |
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| Country | Link |
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| CN (1) | CN106849902A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107945798A (en) * | 2017-12-18 | 2018-04-20 | 唐丙振 | A kind of voice intelligent recognition touch switch and its control method |
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