CN104967947A - Low-pass filtering amplification audio processing system based on step-down constant current circuit - Google Patents
Low-pass filtering amplification audio processing system based on step-down constant current circuit Download PDFInfo
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Abstract
The invention discloses a low-pass filtering amplification audio processing system based on a step-down constant current circuit, and the system consists of an audio collection module, a frequency-selecting circuit connected with the audio collection module, a linear drive circuit, a current source circuit, a microprocessing circuit connected with the linear drive circuit and the current source circuit, and a two-stage low-pass filtering amplification circuit connected with the current source circuit, wherein the linear drive circuit and the current source circuit are connected with the frequency-selecting circuit. The system is characterized in that the step-down constant current circuit is connected in series between the frequency-selecting circuit and the two-stage low-pass filtering amplification circuit; and the step-down constant current circuit consists of a step-down chip U2, a triode VT, a triode VT11, and an amplifier P3. The system employs the step-down constant current circuit, can guarantee the stability of voltage and current of the circuits, and enables an image of a film to be clear and stable.
Description
Technical field
The present invention relates to a kind of electronic system, specifically refer to that a kind of low-pass filtering based on voltage-dropping type constant current circuit amplifies audio frequency processing system.
Background technology
Along with people pursue more and more higher to quality of life, present home theater enters into every household substantially, brings very large enjoyment to people's life.But, often there will be the unclear situation of sound when people watch film, thus have influence on film play quality.
Summary of the invention
The object of the invention is to overcome the voltage of current circuit, defect that electric current instability easily causes the audio distortion after audio frequency processing system process, provide a kind of low-pass filtering based on voltage-dropping type constant current circuit of burning voltage, current processing audio frequency that can provide to amplify audio frequency processing system.
The following technical scheme of object of the present invention realizes: the low-pass filtering based on voltage-dropping type constant current circuit amplifies audio frequency processing system, by audio collection module, the frequency selection circuit be connected with audio collection module, the linear drive circuit be all connected with frequency selection circuit and current source circuit, the micro-processor interface circuit be simultaneously connected with current source circuit with linear drive circuit, the two-stage low-pass filtering amplifying circuit be connected with current source circuit, and the voltage-dropping type constant current circuit be serially connected between frequency selection circuit and two-stage low-pass filtering amplifying circuit forms.
Described voltage-dropping type constant current electrical route step-down chip U2, triode VT10, triode VT11, amplifier P3, P pole is in turn through electric capacity C15, resistance R23, resistance R22, be connected with the REG pin of step-down chip U2 after electric capacity C16, the diode D4 that N pole is connected with the FSET pin of step-down chip U2 after resistance R24, positive pole is connected with the OUT pin of step-down chip U2 after resistance R25, the electric capacity C17 that negative pole is connected with the BST pin of step-down chip U2 after resistance R26, P pole is connected with the electrode input end of amplifier P3 after resistance R27, the diode D5 that N pole is connected with the base stage of triode VT10 after inductance L, positive pole is connected with the electrode input end of amplifier P3, the electric capacity C18 that negative pole is connected with the emitter of triode VT10 after resistance R28, negative pole is in turn through resistance R30, be connected with the base stage of triode VT10 after resistance R29, the electric capacity C19 that positive pole is connected with the collector electrode of triode VT11, and one end is connected with the negative input of amplifier P3, the resistance R21 that the other end is connected with the tie point of electric capacity C19 with resistance R22 forms, the VDD pin of described step-down chip U2 is connected with the tie point of diode D4 with resistance R24, and its FB pin is then connected with the output of amplifier P3, its GND pin ground connection, the grounded collector of described triode VT6, the base stage of described triode VT7 is connected with the negative pole of electric capacity C18, and its emitter is connected with the tie point of resistance R21 with electric capacity C16, the negative pole of described electric capacity C19 is connected with two-stage low-pass filtering amplifying circuit, meanwhile, the N pole of diode D4 is then connected with frequency selection circuit, and the N pole of diode D5 is also connected with the positive pole of electric capacity C17.
Described linear drive circuit is by driving chip U, triode VT7, triode VT8, triode VT9, triode VT10, positive pole is connected with frequency selection circuit, the polar capacitor C12 that negative pole is connected with the IN1 pin of driving chip U after resistance R14, one end is connected with the collector electrode of triode VT7, the resistance R15 that the other end is connected with the base stage of triode VT9 after resistance R16, positive pole is connected with the base stage of triode VT7, the polar capacitor C14 that negative pole is connected with the IN1 pin of driving chip U, positive pole is connected with the IN2 pin of driving chip U, the polar capacitor C13 of minus earth, one end is connected with the emitter of triode VT7, the resistance R18 that the other end is connected with the base stage of triode VT8, one end is connected with the base stage of triode VT8, the resistance R17 that the other end is connected with the base stage of triode VT9, N pole is connected with the collector electrode of triode VT7, the diode D3 that P pole is connected with the collector electrode of triode VT8, positive terminal is connected with the collector electrode of triode VT7, the not gate K that end of oppisite phase is connected with triode VT10 collector electrode, one end is connected with triode VT10 emitter, the resistance R20 that the other end is connected with the emitter of triode VT9 after resistance R19, the end of oppisite phase of P pole NAND gate K is connected, the diode D2 that N pole is connected with the tie point of resistance R20 with resistance R19 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT7, END pin ground connection, OUT pin are connected with the collector electrode of triode VT8, the collector electrode of triode VT8 is also connected with the base stage of triode VT10, its emitter is connected with the base stage of triode man VT9, the grounded collector of triode VT9, the N pole of diode D2 is connected with micro-processor interface circuit.
Described frequency selection circuit is by triode VT1, triode VT2, positive pole is connected with the base stage of triode VT1 after resistance R1, negative pole then through the polar capacitor C1 that polar capacitor C2 is connected with the base stage of triode VT1 after polar capacitor C3, and the resistance R2 that one end is connected with the base stage of triode VT2, the other end is then connected with the collector electrode of triode VT1 forms; The collector electrode of described triode VT2 is simultaneously with the positive pole of polar capacitor C1 and an output of audio collection module is connected, its emitter is then connected with current source circuit, and the emitter of triode VT1 is then connected with another output of the tie point of polar capacitor C3, the positive pole of electric capacity C12 and audio collection module with polar capacitor C2 respectively; The emitter of described triode VT1 is connected with the N pole of diode D4.
Described micro-processor interface circuit comprises polar capacitor C4, polar capacitor C5, resistance R6, and field effect transistor Q1; The positive pole of polar capacitor C4 is connected with the N pole of diode D2, its negative pole is connected with the grid of field effect transistor Q1, one end of resistance R6 is connected with the grid of field effect transistor Q1, other end ground connection, the negative pole of polar capacitor C5 is connected with the drain electrode of field effect transistor Q1, positive pole is then connected with current source circuit and two-stage low-pass filtering amplifying circuit simultaneously, and the source electrode of described field effect transistor Q1 is connected with current source circuit.
Described current source circuit is by triode VT3, triode VT4, the voltage stabilizing didoe D1 that N pole is connected with the base stage of triode VT3, P pole is connected with the emitter of triode VT3 after resistance R4, one end is connected with the base stage of triode VT3, the resistance R3 of other end ground connection, and the resistance R5 that one end is connected with triode VT4 emitter, the other end is connected with the positive pole of polar capacitor C5 forms; The described collector electrode of triode VT3 is connected with the source electrode of field effect transistor Q1, emitter is connected with the base stage of triode VT4, the grounded collector of triode VT4, and the P pole of voltage stabilizing didoe D1 is connected with external power source.
Described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT5, triode VT6, positive pole is connected with the negative pole of electric capacity C19, the polar capacitor C6 of minus earth, one end is connected with the normal phase input end of amplifier P1, the resistance R7 that the other end is connected with the P pole of diode D1, positive pole is connected with amplifier P1 inverting input after resistance R8, the polar capacitor C7 that negative pole is connected with the negative pole of polar capacitor C6, be serially connected in the polar capacitor C8 between the output of amplifier P1 and inverting input, negative pole is connected with the output of amplifier P1, the polar capacitor C9 that positive pole is connected with the base stage of triode VT5, one end is connected with the collector electrode of triode VT5, the resistance R9 that the other end is connected with the emitter of triode VT6, positive pole is connected with the base stage of triode VT6 after resistance R10, the polar capacitor C10 of ground connection while negative pole is connected with amplifier P1 output, one end is connected with the positive pole of polar capacitor C10, the resistance R11 that the other end is connected with the inverting input of amplifier P2, the resistance R12 be in parallel with resistance R11, be serially connected in the polar capacitor C11 between the output of amplifier P2 and inverting input, and the resistance R13 be serially connected between the normal phase input end of amplifier P2 and output forms, the emitter of described triode VT5 is connected with polar capacitor C10 negative pole, and the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2.
For guaranteeing result of use, described driving chip U is LM387 integrated chip, and described step-down chip U2 is A718EGT cake core.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the present invention adopts voltage-dropping type constant current circuit, and it can guarantee the stability of the electric current and voltage of this treatment system circuit, thus film is play can keep clear, a stable image.
(2) the present invention is provided with linear drive circuit, and it distortionlessly can amplify audio signal, makes sound effect better improve film play quality.
(3) structure of the present invention is simple, and energy efficient.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the overall structure schematic diagram of linear drive circuit of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, the present invention is by audio collection module, the frequency selection circuit be connected with audio collection module, the linear drive circuit be all connected with frequency selection circuit and current source circuit, the micro-processor interface circuit be simultaneously connected with current source circuit with linear drive circuit, the two-stage low-pass filtering amplifying circuit be connected with current source circuit, and the voltage-dropping type constant current circuit be serially connected between frequency selection circuit and two-stage low-pass filtering amplifying circuit forms.
Described voltage-dropping type constant current electrical route step-down chip U2, triode VT10, triode VT11, amplifier P3, resistance R21, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, electric capacity C15, electric capacity C16, electric capacity C17, electric capacity C18, electric capacity C19, diode D4, and diode D5 forms.
During connection, the P pole of diode D4 is connected with the REG pin of step-down chip U2 in turn after electric capacity C15, resistance R23, resistance R22, electric capacity C16, N pole is connected with the FSET pin of step-down chip U2 after resistance R24.The positive pole of electric capacity C17 is connected with the OUT pin of step-down chip U2 after resistance R25, negative pole is connected with the BST pin of step-down chip U2 after resistance R26.The P pole of diode D5 is connected with the electrode input end of amplifier P3 after resistance R27, N pole is connected with the base stage of triode VT10 after inductance L.
Wherein, the positive pole of electric capacity C18 is connected with the electrode input end of amplifier P3, negative pole is connected with the emitter of triode VT10 after resistance R28.The negative pole of electric capacity C19 is connected with the base stage of triode VT10 in turn after resistance R30, resistance R29, positive pole is connected with the collector electrode of triode VT11.And one end of resistance R21 is connected with the negative input of amplifier P3, the other end is connected with the tie point of electric capacity C19 with resistance R22.
During use, step-down chip U2 preferentially adopts model to be the chip of A718EGT, its built-in 2.5A MOS switch; It has the functions such as Bootstrap, short-circuit protection, low power consumption switch; A718EGT adopts friendly process, and input supply voltage scope is 6 ~ 36V; Its static working current is 625 ~ 900 μ A, and cut-off current is 95 ~ 160 μ A, and constant output current is 2A.
During connection, the VDD pin of step-down chip U2 is connected with the tie point of diode D4 with resistance R24, and its FB pin is then connected with the output of amplifier P3, its GND pin ground connection; The grounded collector of described triode VT6; The base stage of described triode VT7 is connected with the negative pole of electric capacity C18, and its emitter is connected with the tie point of resistance R21 with electric capacity C16; The negative pole of described electric capacity C19 is connected with two-stage low-pass filtering amplifying circuit; Meanwhile, the N pole of diode D4 is then connected with frequency selection circuit, and the N pole of diode D5 is also connected with the positive pole of electric capacity C17.
For better implementing the present invention, described electric capacity C15, electric capacity C16, electric capacity C17, electric capacity C18, electric capacity C19 adopt polar capacitor.
Described linear drive circuit can, under the distortionless prerequisite that audio signal is amplified, make sound effect better improve film play quality.As shown in Figure 2, it is by driving chip U, triode VT7, triode VT8 for its concrete structure, triode VT9, triode VT10, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, electric capacity C12, electric capacity C13, electric capacity C14, diode D2, diode D3, and not gate K forms.
During connection, the positive pole of polar capacitor C12 is connected with frequency selection circuit, negative pole is connected with the IN1 pin of driving chip U after resistance R14.One end of resistance R15 is connected with the collector electrode of triode VT7, the other end is connected with the base stage of triode VT9 after resistance R16.The positive pole of polar capacitor C14 is connected with the base stage of triode VT7, negative pole is connected with the IN1 pin of driving chip U.The positive pole of polar capacitor C13 is connected with the IN2 pin of driving chip U, minus earth.One end of resistance R18 is connected with the emitter of triode VT7, the other end is connected with the base stage of triode VT8.One end of resistance R17 is connected with the base stage of triode VT8, the other end is connected with the base stage of triode VT9.
Wherein, the N pole of diode D3 is connected with the collector electrode of triode VT7, P pole is connected with the collector electrode of triode VT8.The positive terminal of not gate K is connected with the collector electrode of triode VT7, end of oppisite phase is connected with triode VT10 collector electrode.One end of resistance R20 is connected with triode VT10 emitter, the other end is connected with the emitter of triode VT9 after resistance R19.The end of oppisite phase of the P pole NAND gate K of diode D2 is connected, N pole is connected with the tie point of resistance R20 with resistance R19.
The VCC pin of described driving chip U is connected with the base stage of triode VT7, END pin ground connection, OUT pin are connected with the collector electrode of triode VT8, the collector electrode of triode VT8 is also connected with the base stage of triode VT10, its emitter is connected with the base stage of triode man VT9, the grounded collector of triode VT9, the N pole of diode D2 is connected with micro-processor interface circuit.
In order to ensure implementation result, described driving chip U is preferably LM387 integrated chip to realize, its highly sensitive and low price.
Described frequency selection circuit is by triode VT1, triode VT2, positive pole is connected with the base stage of triode VT1 after resistance R1, negative pole then through the polar capacitor C1 that polar capacitor C2 is connected with the base stage of triode VT1 after polar capacitor C3, and the resistance R2 that one end is connected with the base stage of triode VT2, the other end is then connected with the collector electrode of triode VT1 forms.
Wherein, the collector electrode of triode VT2 is simultaneously with the positive pole of polar capacitor C1 and an output of audio collection module is connected, its emitter is then connected with current source circuit, and the emitter of triode VT1 is then connected with another output of the tie point of polar capacitor C3, the positive pole of electric capacity C12 and audio collection module with polar capacitor C2 respectively; The emitter of described triode VT1 is connected with the N pole of diode D4.
Described micro-processor interface circuit comprises polar capacitor C4, polar capacitor C5, resistance R6, and field effect transistor Q1.During connection, the positive pole of polar capacitor C4 is connected with the N pole of diode D2, its negative pole is connected with the grid of field effect transistor Q1, one end of resistance R6 is connected with the grid of field effect transistor Q1, other end ground connection, the negative pole of polar capacitor C5 is connected with the drain electrode of field effect transistor Q1, positive pole is then connected with current source circuit and two-stage low-pass filtering amplifying circuit simultaneously, and the source electrode of described field effect transistor Q1 is connected with current source circuit.
Described current source circuit is by triode VT3, triode VT4, the voltage stabilizing didoe D1 that N pole is connected with the base stage of triode VT3, P pole is connected with the emitter of triode VT3 after resistance R4, one end is connected with the base stage of triode VT3, the resistance R3 of other end ground connection, and the resistance R5 that one end is connected with triode VT4 emitter, the other end is connected with the positive pole of polar capacitor C5 forms.
The described collector electrode of triode VT3 is connected with the source electrode of field effect transistor Q1, emitter is connected with the base stage of triode VT4, the grounded collector of triode VT4, and the P pole of voltage stabilizing didoe D1 is connected with external power source.
Described two-stage low-pass filtering amplifying circuit by amplifier P1, amplifier P2, triode VT5, triode VT6, resistance R7, resistance R8, resistance R9, resistance R10 resistance R11, resistance R12, resistance R13, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, electric capacity C11, and diode D1 forms.
During connection, the positive pole of polar capacitor C6 is connected with the negative pole of electric capacity C19, minus earth.One end of resistance R7 is connected with the normal phase input end of amplifier P1, the other end is connected with the P pole of diode D1.The positive pole of polar capacitor C7 is connected with amplifier P1 inverting input after resistance R8, negative pole is connected with the negative pole of polar capacitor C6.Between the output being serially connected in amplifier P1 of polar capacitor C8 and inverting input.The negative pole of polar capacitor C9 is connected with the output of amplifier P1, positive pole is connected with the base stage of triode VT5.One end of resistance R9 is connected with the collector electrode of triode VT5, the other end is connected with the emitter of triode VT6.
Wherein, the positive pole of polar capacitor C10 be connected with the base stage of triode VT6 after resistance R10, negative pole be connected with amplifier P1 output while ground connection.One end of resistance R11 is connected with the positive pole of polar capacitor C10, the other end is connected with the inverting input of amplifier P2.Resistance R12 is in parallel with resistance R11.Between the output being serially connected in amplifier P2 of polar capacitor C11 and inverting input.And between the normal phase input end being serially connected in amplifier P2 of resistance R13 and output.
The emitter of described triode VT5 is connected with polar capacitor C10 negative pole, and the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2.
As mentioned above, just well the present invention can be realized.
Claims (7)
1. the low-pass filtering based on voltage-dropping type constant current circuit amplifies audio frequency processing system, by audio collection module, the frequency selection circuit be connected with audio collection module, the linear drive circuit be all connected with frequency selection circuit and current source circuit, the micro-processor interface circuit be simultaneously connected with current source circuit with linear drive circuit, and the two-stage low-pass filtering amplifying circuit to be connected with current source circuit forms, and it is characterized in that: be also serially connected with voltage-dropping type constant current circuit between frequency selection circuit and two-stage low-pass filtering amplifying circuit, described voltage-dropping type constant current electrical route step-down chip U2, triode VT10, triode VT11, amplifier P3, P pole is in turn through electric capacity C15, resistance R23, resistance R22, be connected with the REG pin of step-down chip U2 after electric capacity C16, the diode D4 that N pole is connected with the FSET pin of step-down chip U2 after resistance R24, positive pole is connected with the OUT pin of step-down chip U2 after resistance R25, the electric capacity C17 that negative pole is connected with the BST pin of step-down chip U2 after resistance R26, P pole is connected with the electrode input end of amplifier P3 after resistance R27, the diode D5 that N pole is connected with the base stage of triode VT10 after inductance L, positive pole is connected with the electrode input end of amplifier P3, the electric capacity C18 that negative pole is connected with the emitter of triode VT10 after resistance R28, negative pole is in turn through resistance R30, be connected with the base stage of triode VT10 after resistance R29, the electric capacity C19 that positive pole is connected with the collector electrode of triode VT11, and one end is connected with the negative input of amplifier P3, the resistance R21 that the other end is connected with the tie point of electric capacity C19 with resistance R22 forms, the VDD pin of described step-down chip U2 is connected with the tie point of diode D4 with resistance R24, and its FB pin is then connected with the output of amplifier P3, its GND pin ground connection, the grounded collector of described triode VT6, the base stage of described triode VT7 is connected with the negative pole of electric capacity C18, and its emitter is connected with the tie point of resistance R21 with electric capacity C16, the negative pole of described electric capacity C19 is connected with two-stage low-pass filtering amplifying circuit, meanwhile, the N pole of diode D4 is then connected with frequency selection circuit, and the N pole of diode D5 is also connected with the positive pole of electric capacity C17.
2. the low-pass filtering based on voltage-dropping type constant current circuit according to claim 1 amplifies audio frequency processing system, it is characterized in that: described linear drive circuit is by driving chip U, triode VT7, triode VT8, triode VT9, triode VT10, positive pole is connected with frequency selection circuit, the polar capacitor C12 that negative pole is connected with the IN1 pin of driving chip U after resistance R14, one end is connected with the collector electrode of triode VT7, the resistance R15 that the other end is connected with the base stage of triode VT9 after resistance R16, positive pole is connected with the base stage of triode VT7, the polar capacitor C14 that negative pole is connected with the IN1 pin of driving chip U, positive pole is connected with the IN2 pin of driving chip U, the polar capacitor C13 of minus earth, one end is connected with the emitter of triode VT7, the resistance R18 that the other end is connected with the base stage of triode VT8, one end is connected with the base stage of triode VT8, the resistance R17 that the other end is connected with the base stage of triode VT9, N pole is connected with the collector electrode of triode VT7, the diode D3 that P pole is connected with the collector electrode of triode VT8, positive terminal is connected with the collector electrode of triode VT7, the not gate K that end of oppisite phase is connected with triode VT10 collector electrode, one end is connected with triode VT10 emitter, the resistance R20 that the other end is connected with the emitter of triode VT9 after resistance R19, and the end of oppisite phase of P pole NAND gate K is connected, the diode D2 that N pole is connected with the tie point of resistance R20 with resistance R19 forms, the VCC pin of described driving chip U is connected with the base stage of triode VT7, END pin ground connection, OUT pin are connected with the collector electrode of triode VT8, the collector electrode of triode VT8 is also connected with the base stage of triode VT10, its emitter is connected with the base stage of triode man VT9, the grounded collector of triode VT9, the N pole of diode D2 is connected with micro-processor interface circuit, described driving chip U is LM387 integrated chip.
3. the low-pass filtering based on voltage-dropping type constant current circuit according to claim 2 amplifies audio frequency processing system, it is characterized in that: described frequency selection circuit is by triode VT1, triode VT2, positive pole is connected with the base stage of triode VT1 after resistance R1, negative pole then through the polar capacitor C1 that polar capacitor C2 is connected with the base stage of triode VT1 after polar capacitor C3, and the resistance R2 that one end is connected with the base stage of triode VT2, the other end is then connected with the collector electrode of triode VT1 forms; The collector electrode of described triode VT2 is simultaneously with the positive pole of polar capacitor C1 and an output of audio collection module is connected, its emitter is then connected with current source circuit, and the emitter of triode VT1 is then connected with another output of the tie point of polar capacitor C3, the positive pole of electric capacity C12 and audio collection module with polar capacitor C2 respectively; The emitter of described triode VT1 is connected with the N pole of diode D4.
4. the low-pass filtering based on voltage-dropping type constant current circuit according to claim 3 amplifies audio frequency processing system, it is characterized in that: described micro-processor interface circuit comprises polar capacitor C4, polar capacitor C5, resistance R6, and field effect transistor Q1; The positive pole of polar capacitor C4 is connected with the N pole of diode D2, its negative pole is connected with the grid of field effect transistor Q1, one end of resistance R6 is connected with the grid of field effect transistor Q1, other end ground connection, the negative pole of polar capacitor C5 is connected with the drain electrode of field effect transistor Q1, positive pole is then connected with current source circuit and two-stage low-pass filtering amplifying circuit simultaneously, and the source electrode of described field effect transistor Q1 is connected with current source circuit.
5. the low-pass filtering based on voltage-dropping type constant current circuit according to claim 4 amplifies audio frequency processing system, it is characterized in that: described current source circuit is by triode VT3, triode VT4, the voltage stabilizing didoe D1 that N pole is connected with the base stage of triode VT3, P pole is connected with the emitter of triode VT3 after resistance R4, one end is connected with the base stage of triode VT3, the resistance R3 of other end ground connection, and the resistance R5 that one end is connected with triode VT4 emitter, the other end is connected with the positive pole of polar capacitor C5 forms; The described collector electrode of triode VT3 is connected with the source electrode of field effect transistor Q1, emitter is connected with the base stage of triode VT4, the grounded collector of triode VT4, and the P pole of voltage stabilizing didoe D1 is connected with external power source.
6. the low-pass filtering based on voltage-dropping type constant current circuit according to claim 5 amplifies audio frequency processing system, it is characterized in that: described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT5, triode VT6, positive pole is connected with the negative pole of electric capacity C19, the polar capacitor C6 of minus earth, one end is connected with the normal phase input end of amplifier P1, the resistance R7 that the other end is connected with the P pole of diode D1, positive pole is connected with amplifier P1 inverting input after resistance R8, the polar capacitor C7 that negative pole is connected with the negative pole of polar capacitor C6, be serially connected in the polar capacitor C8 between the output of amplifier P1 and inverting input, negative pole is connected with the output of amplifier P1, the polar capacitor C9 that positive pole is connected with the base stage of triode VT5, one end is connected with the collector electrode of triode VT5, the resistance R9 that the other end is connected with the emitter of triode VT6, positive pole is connected with the base stage of triode VT6 after resistance R10, the polar capacitor C10 of ground connection while negative pole is connected with amplifier P1 output, one end is connected with the positive pole of polar capacitor C10, the resistance R11 that the other end is connected with the inverting input of amplifier P2, the resistance R12 be in parallel with resistance R11, be serially connected in the polar capacitor C11 between the output of amplifier P2 and inverting input, and the resistance R13 be serially connected between the normal phase input end of amplifier P2 and output forms, the emitter of described triode VT5 is connected with polar capacitor C10 negative pole, and the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2.
7. the low-pass filtering based on voltage-dropping type constant current circuit according to any one of claim 1 ~ 6 amplifies audio frequency processing system, it is characterized in that: described step-down chip U2 is A718EGT cake core.
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|---|---|---|---|---|
| CN105507738A (en) * | 2015-12-22 | 2016-04-20 | 成都雷纳斯科技有限公司 | Multifunctional high-precision wireless transmission intelligent anti-theft system |
| CN106323482A (en) * | 2016-08-27 | 2017-01-11 | 四川华索自动化信息工程有限公司 | Signal level adjusting type processing system used for flue gas temperature alarm device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807514A (en) * | 2015-04-13 | 2015-07-29 | 成都诚邦动力测试仪器有限公司 | Two-stage low-pass filter and amplification type engine fuel consumption testing system |
| CN104807577A (en) * | 2015-04-25 | 2015-07-29 | 成都诚邦动力测试仪器有限公司 | Torque sensor based on signal linear driving |
| CN110120796B (en) * | 2019-05-22 | 2022-10-28 | 昆明理工大学津桥学院 | Voice signal amplifying and filtering circuit |
-
2014
- 2014-11-29 CN CN201410715449.6A patent/CN104469613A/en active Pending
-
2015
- 2015-06-12 CN CN201510323511.1A patent/CN104967947A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507738A (en) * | 2015-12-22 | 2016-04-20 | 成都雷纳斯科技有限公司 | Multifunctional high-precision wireless transmission intelligent anti-theft system |
| CN106323482A (en) * | 2016-08-27 | 2017-01-11 | 四川华索自动化信息工程有限公司 | Signal level adjusting type processing system used for flue gas temperature alarm device |
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| CN104469613A (en) | 2015-03-25 |
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