CN105321545A - Pre-amplification type novel recording system based on audio power amplification circuit - Google Patents
Pre-amplification type novel recording system based on audio power amplification circuit Download PDFInfo
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- CN105321545A CN105321545A CN201510855994.XA CN201510855994A CN105321545A CN 105321545 A CN105321545 A CN 105321545A CN 201510855994 A CN201510855994 A CN 201510855994A CN 105321545 A CN105321545 A CN 105321545A
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Abstract
The invention discloses a pre-amplification type novel recording system based on an audio power amplification circuit. The recording system is characterized by mainly comprising a microprocessor, a memory, a conversion module, an audio filter circuit, a timer, a pre-amplification circuit, an audio acquisition module, the audio power amplification circuit and a loudspeaker, wherein the memory, the conversion module, the audio filter circuit and the timer are respectively connected with the microprocessor; the pre-amplification circuit is connected with the conversion module; the audio acquisition module is connected with the pre-amplification circuit; the audio power amplification circuit is connected with the audio filter circuit; the loudspeaker is connected with the audio power amplification circuit; and the audio acquisition module is also connected with the microprocessor. The recording system has the advantages and beneficial effects that jamming noises can be inhibited and needed audio signals can be retained, so that the recording playing clarity can be improved; and the audio power amplification circuit is arranged and can be used for amplifying the power of the output audio signals, so that people can clearly listen to the recorded sounds repeatedly.
Description
Technical field
The present invention relates to a kind of recording system, specifically refer to a kind of enlarge leadingly formula Novel recording system based on audio power amplifying circuit.
Background technology
At present, along with the needs of the development of science and technology and people's routine work, study and life, sound pick-up outfit has become the requisite appliance and electronic of every field, and the digital recorder with high-quality recording effect is then subject to the favor of people more.
But existing sound pick-up outfit all can be recorded various sound when recording, and it cannot well suppress impurity audio frequency when processing sound signal, very large noise interference therefore can be subject to when people return playback.
Summary of the invention
The object of the invention is to overcome existing sound pick-up outfit and well to the defect that impurity audio frequency suppresses, a kind of enlarge leadingly formula Novel recording system based on audio power amplifying circuit cannot be provided.
Object of the present invention is achieved through the following technical solutions: a kind of enlarge leadingly formula Novel recording system based on audio power amplifying circuit, primarily of microprocessor, the storer be connected with microprocessor respectively, modular converter, audio frequency filtering circuit and timer, the pre-amplification circuit be connected with modular converter, the audio collection module be connected with pre-amplification circuit, the audio power amplifying circuit be connected with audio frequency filtering circuit, and the loudspeaker be connected with audio power amplifying circuit forms; Described audio collection module is also connected with microprocessor.
Further, described audio power amplifying circuit is by amplifier P4, triode VT9, triode VT10, negative pole is connected with the positive pole of amplifier P4, positive pole then forms the electric capacity C10 of the input end of this audio power amplifying circuit, one end is connected with the negative pole of amplifier P4, the resistance R16 of other end ground connection, N pole is connected with the emitter of triode VT10, the diode D6 that P pole is then connected with the positive pole of amplifier P4 after potentiometer R17, be serially connected in the resistance R18 between the collector of triode VT10 and the output terminal of amplifier P4, be serially connected in the resistance R19 between the emitter of triode VT10 and the emitter of triode VT9, and positive pole is connected with the emitter of triode VT10, the electric capacity C11 that negative pole then forms the output terminal of this audio power amplifying circuit forms, grounded collector, its base stage of described triode VT9 are connected with the base stage of triode VT10, the output terminal of described amplifier P4 is connected with the base stage of triode VT9, the P pole of described diode D6 is also connected with the control end of potentiometer R17, the input end of described audio power amplifying circuit is connected with the output terminal of audio frequency filtering circuit, its output terminal is then connected with loudspeaker.
Described pre-amplification circuit is by amplifier P1, amplifier P2, XOR gate P3, triode VT8, negative pole is connected with the positive pole of amplifier P1 after resistance R10, positive pole then forms the electric capacity C5 of the input end of this pre-amplification circuit, be serially connected in the resistance R9 between the negative pole of electric capacity C5 and the positive pole of XOR gate P3, one end is connected with the negative pole of XOR gate P3, the resistance R12 of other end ground connection, be serially connected in the resistance R11 between the positive pole of amplifier P1 and output terminal, positive pole is connected with the positive pole of amplifier P1, the electric capacity C6 that negative pole is then connected with the output terminal of amplifier P1, positive pole is connected with the negative pole of amplifier P1, the electric capacity C7 of minus earth, positive pole is connected with the positive pole of electric capacity C7, the electric capacity C8 that negative pole is then connected with the base stage of triode VT8, be serially connected in the resistance R13 between the collector of triode VT8 and the output terminal of XOR gate P3, positive pole is connected with the collector of triode VT8, the electric capacity C9 that negative pole is then connected with the output terminal of XOR gate P3, N pole is connected with the negative pole of amplifier P2, the diode D5 that P pole is then connected with the collector of triode VT8, be serially connected in the resistance R14 between the output terminal of amplifier P1 and the positive pole of amplifier P2, and the resistance R15 be serially connected between the output terminal of amplifier P1 and the output terminal of amplifier P2 forms, the emitter of described triode VT8 is connected with the output terminal of amplifier P1, the output terminal of described amplifier P2 then forms the output terminal of this pre-amplification circuit and is connected with the input end of modular converter, the input end of described pre-amplification circuit is then connected with audio collection module.
Described audio frequency filtering circuit is by differential amplifier circuit, and the suppression circuit be connected with differential amplifier circuit output terminal forms; The input end of described differential amplifier circuit is connected with microprocessor, suppresses the output terminal of circuit to be then connected with the input end of audio power amplifying circuit.
Described differential amplifier circuit is by triode VT1, triode VT2, triode VT3, the electric capacity C1 that negative pole is connected with the base stage of triode VT1 after resistance R1, positive pole then forms the input end of this differential amplifier circuit, the diode D1 that P pole is connected with the collector of triode VT1, N pole connects+20V voltage, and the potentiometer R2 be serially connected between the emitter of triode VT1 and the base stage of triode VT3 forms; The control end of described potentiometer is connected with suppression circuit; The base stage of described triode VT3 is connected with the collector of triode VT2, its emitter is then connected with suppression circuit, its grounded collector; The emitter of described triode VT2 is connected with the collector of triode VT1, its base stage is then connected with suppression circuit.
Described suppression circuit is by filtering chip U, triode VT4, triode VT5, triode VT6, triode VT7, one end is connected with the N pole of diode D1, the resistance R4 that the other end is then connected with the VDD pin of filtering chip U after resistance R5, positive pole is connected with the tie point of resistance R5 with resistance R4, the electric capacity C2 that negative pole is then connected with the base stage of triode VT2, N pole is connected with the VDD pin of filtering chip U, the diode D2 that P pole is then connected with the base stage of triode VT2, one end is connected with the EN pin of filtering chip U, the resistance R3 that the other end is then connected with the emitter of triode VT3, positive pole is connected with the base stage of triode VT5 after resistance R6, the electric capacity C4 that negative pole is then connected with the collector of triode VT5, N pole is connected with the positive pole of electric capacity C4, the diode D3 that P pole is then connected with the DRV pin of filtering chip U, N pole is connected with the emitter of triode VT5, the diode D4 that P pole is then connected with the emitter of triode VT7 after resistance R7, positive pole is connected with the FB pin of filtering chip U, the electric capacity C3 that negative pole is then connected with the P pole of diode D4, and the resistance R8 be serially connected between the base stage of triode VT7 and collector forms, the TOFF pin of described filtering chip U is connected with the control end of potentiometer R2, its COMP pin is then connected with the emitter of triode VT3, its VSS pin is connected with the base stage of triode VT6, its CS pin is then connected with the base stage of triode VT4, the emitter of described triode VT6 is connected with the negative pole of electric capacity C3, its collector is then connected with the base stage of triode VT7, the collector of described triode VT7 is connected with-20V voltage, the output terminal that the emitter of described triode VT4 is connected with the base stage of triode VT5, its collector then forms this suppression circuit.
Described filtering chip U is UCT4392 integrated chip.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention can suppress interfering noise and retain the sound signal of needs, therefore can improve the sharpness that recording is play.
(2) the present invention is provided with timer, this timer can arrange recording starting time and recording stand-by time, when recording starting time then can start recording automatically, and automatically stop according to the recording stand-by time set, range of application of the present invention so can be made wider.
(3) the present invention is provided with pre-amplification circuit, this pre-amplification circuit can carry out distortionless amplification to the sound signal collected, enable rearmounted conversion modulus and microprocessor better change sound signal and identify, thus improve stability of the present invention.
(4) the present invention is provided with audio power amplifying circuit, and it can amplify the power of the sound signal exported, and therefore people can return very clearly and listen recorded sound.
Accompanying drawing explanation
Fig. 1 is one-piece construction block diagram of the present invention.
Fig. 2 is the structural drawing of audio frequency filtering circuit of the present invention.
Fig. 3 is the structural drawing of pre-amplification circuit of the present invention.
Fig. 4 is the structural drawing of audio power amplifying circuit of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, enlarge leadingly formula Novel recording system based on audio power amplifying circuit of the present invention, primarily of microprocessor, the storer be connected with microprocessor respectively, modular converter, audio frequency filtering circuit and timer, the pre-amplification circuit be connected with modular converter, the audio collection module be connected with pre-amplification circuit, the audio power amplifying circuit be connected with audio frequency filtering circuit, and the loudspeaker be connected with audio power amplifying circuit forms; Described audio collection module is also connected with microprocessor.
Wherein, audio collection module is for gathering extraneous sound signal, and its SV-2602 sound acquisition module that Wei Linke Science and Technology Ltd. of Shenzhen can be selected to produce realizes.Pre-amplification circuit can carry out distortionless amplification to the sound signal collected.Modular converter is used for the sound signal collected being converted to digital electric signal and sending to microprocessor.Microprocessor is then as the control center for invention, and it preferentially adopts AT89S52 main control chip to realize.Timer is for setting record length, and storer is then for storing collected sound signal.Audio frequency filtering circuit can suppress the noise signals existed in sound signal, to improve the sharpness exporting sound.Audio power amplifying circuit then for amplifying the power of the sound signal exported, improves the sharpness of recording further.This timer, storer, modular converter and loudspeaker adopt existing technology to realize.
As shown in Figure 2, described audio frequency filtering circuit can suppress the noise signals collected, and it is by differential amplifier circuit, and the suppression circuit be connected with differential amplifier circuit output terminal forms.The input end of described differential amplifier circuit is connected with microprocessor, suppresses the output terminal of circuit to be then connected with the input end of audio power amplifying circuit.
Described differential amplifier circuit can process the sound signal collected, and it is by triode VT1, triode VT2, triode VT3, resistance R1, electric capacity C1, and potentiometer R2 and diode D1 forms.
During connection, the input end that the negative pole of electric capacity C1 is connected with the base stage of triode VT1 after resistance R1, its positive pole then forms this differential amplifier circuit.The P pole of diode D1 is connected with the collector of triode VT1, its N pole connects+20V voltage.Potentiometer R2 is then serially connected between the emitter of triode VT1 and the base stage of triode VT3.The control end of described potentiometer is connected with suppression circuit; The base stage of described triode VT3 is connected with the collector of triode VT2, its emitter is then connected with suppression circuit, its grounded collector.The emitter of described triode VT2 is connected with the collector of triode VT1, its base stage is then connected with suppression circuit.
Sound signal input come in after first through electric capacity C1 filtering, then after resistance R1, input to the differential amplifier be made up of triode VT1 and triode VT2 amplify.This resistance R1 is biasing resistor, and it can avoid sound signal in the process of amplifying, occur the existing picture of distortion.Diode D1 is the common P pole diode of this differential amplifier, which determines the common-mode rejection ratio of this differential amplifier circuit and the size of static working current at the corresponding levels.
Described suppression circuit by filtering chip U, triode VT4, triode VT5, triode VT6, triode VT7, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, diode D2, diode D3, diode D4, electric capacity C2, electric capacity C3 and electric capacity C4 form.
During connection, one end of resistance R4 is connected with the N pole of diode D1, its other end is then connected with the VDD pin of filtering chip U after resistance R5.The positive pole of electric capacity C2 is connected with the tie point of resistance R5 with resistance R4, its negative pole is then connected with the base stage of triode VT2.The N pole of diode D2 is connected with the VDD pin of filtering chip U, its P pole is then connected with the base stage of triode VT2.One end of resistance R3 is connected with the EN pin of filtering chip U, its other end is then connected with the emitter of triode VT3.The positive pole of electric capacity C4 is connected with the base stage of triode VT5 after resistance R6, its negative pole is then connected with the collector of triode VT5.The N pole of diode D3 is connected with the positive pole of electric capacity C4, its P pole is then connected with the DRV pin of filtering chip U.The N pole of diode D4 is connected with the emitter of triode VT5, its P pole is then connected with the emitter of triode VT7 after resistance R7.The positive pole of electric capacity C3 is connected with the FB pin of filtering chip U, its negative pole is then connected with the P pole of diode D4.Between the base stage that resistance R8 is then serially connected in triode VT7 and collector.
Meanwhile, the TOFF pin of described filtering chip U is connected with the control end of potentiometer R2, its COMP pin is then connected with the emitter of triode VT3, its VSS pin is connected with the base stage of triode VT6, its CS pin is then connected with the base stage of triode VT4.The emitter of described triode VT6 is connected with the negative pole of electric capacity C3, its collector is then connected with the base stage of triode VT7.The collector of described triode VT7 is connected with-20V voltage.The output terminal that the emitter of described triode VT4 is connected with the base stage of triode VT5, its collector then forms this suppression circuit is also connected with the input end of audio power amplifying circuit.
This electric capacity C3, triode VT6, triode VT7, resistance R7 and resistance R8 form a constant-current source circuit, and it provides constant working current to filtering chip U.After sound signal is delivered into filtering chip U, because the useful sound signal in sound signal is different from the frequency of noise signals, this filtering chip U retains accounting for most useful sound signal in sound signal, and right noise signals suppresses, what therefore export from the CS pin of this filtering chip U is useful sound signal, this useful sound signal, via triode VT4, exports to loudspeaker after the high-pass filtering circuit that triode VT5, resistance R6 and electric capacity C4 form carries out filtering.In order to reach better implementation result, this filtering chip U is preferably UCT4392 integrated chip to realize.
As shown in Figure 3, pre-amplification circuit by amplifier P1, amplifier P2, XOR gate P3, triode VT8, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15 and diode D5 form.
During connection, the negative pole of electric capacity C5 is connected with the positive pole of amplifier P1 after resistance R10, its positive pole then forms the input end of this pre-amplification circuit and is connected with audio collection module.Between the negative pole that resistance R9 is then serially connected in electric capacity C5 and the positive pole of XOR gate P3.One end of resistance R12 is connected with the negative pole of XOR gate P3, its other end ground connection.Between the positive pole that resistance R11 is serially connected in amplifier P1 and output terminal.The positive pole of electric capacity C6 is connected with the positive pole of amplifier P1, its negative pole is then connected with the output terminal of amplifier P1.The positive pole of electric capacity C7 is connected with the negative pole of amplifier P1, its minus earth.The positive pole of electric capacity C8 is connected with the positive pole of electric capacity C7, its negative pole is then connected with the base stage of triode VT8.Between the collector that resistance R13 is then serially connected in triode VT8 and the output terminal of XOR gate P3.The positive pole of electric capacity C9 is connected with the collector of triode VT8, its negative pole is then connected with the output terminal of XOR gate P3.The N pole of diode D5 is connected with the negative pole of amplifier P2, its P pole is then connected with the collector of triode VT8.Resistance R14 is serially connected between the output terminal of amplifier P1 and the positive pole of amplifier P2.Resistance R15 is serially connected between the output terminal of amplifier P1 and the output terminal of amplifier P2.The emitter of described triode VT8 is connected with the output terminal of amplifier P1; The output terminal of described amplifier P2 then forms the output terminal of this pre-amplification circuit and is connected with the input end of modular converter.
Amplified by pre-amplification circuit after sound signal input is come in, wherein, resistance R11 can control the gain of pre-amplification circuit, and namely the gain of resistance this pre-amplification circuit larger of adopted resistance R11 is then larger.And electric capacity C6 is in parallel with resistance R11 can provide low impedance path filtering to high-frequency signal, prevent the existing picture of high-frequency self-excitation.Triode VT8, electric capacity C8, electric capacity C9, resistance R13 and diode D5 then form a biasing circuit, and it can guarantee that sound signal can also keep very high fidelity after amplification.
As shown in Figure 4, audio power amplifying circuit is by amplifier P4, and triode VT9, triode VT10, resistance R16, potentiometer R17, resistance R18, resistance R19, electric capacity C10, electric capacity C11 and diode D6 form.
During connection, the input end that the negative pole of electric capacity C10 is connected with the positive pole of amplifier P1, its positive pole then forms this audio power amplifying circuit is also connected with the output terminal of audio frequency filtering circuit.One end of resistance R16 is connected with the negative pole of amplifier P4, its other end ground connection.The N pole of diode D6 is connected with the emitter of triode VT10, its P pole is then connected with the positive pole of amplifier P4 after potentiometer R17.Resistance R18 is then serially connected between the collector of triode VT10 and the output terminal of amplifier P4.Resistance R19 is serially connected between the emitter of triode VT10 and the emitter of triode VT9.The positive pole of electric capacity C11 is connected with the emitter of triode VT10, its negative pole then forms the output terminal of this audio power amplifying circuit and is connected with loudspeaker.Grounded collector, its base stage of described triode VT9 are connected with the base stage of triode VT10.The output terminal of described amplifier P4 is connected with the base stage of triode VT9; The P pole of described diode D6 is also connected with the control end of potentiometer R17.
Wherein, amplifier P4, resistance R16, potentiometer R17 and diode D6 structure polarity-inverting amplifier, the resistance of regulator potentiometer R17 then can regulate the gain of this polarity-inverting amplifier.Triode VT10 and triode VT9 then forms a base junction, and itself and polarity-inverting amplifier form a backfeed loop, can reduce sound signal occur the existing picture of cross distortion by this structure in the process of amplifying.
During work, operator sets recording starting time and recording stand-by time in timer, when recording starting time then microprocessor send a signal to audio collection module, this audio collection module starts gather extraneous sound signal and flow to pre-amplification circuit.This pre-amplification circuit is transferred to modular converter after carrying out amplification process to sound signal, and modular converter is converted to digital electric signal the sound signal collected and is transferred to microprocessor, and this storer then stores sound signal.When recording stand-by time to after microprocessor send a signal to audio collection module stop record.When needing to play recorded audio frequency, microprocessor then sends to audio frequency filtering circuit sound signal, and this sound signal is play by loudspeaker after audio frequency filtering circuit and audio power amplifying circuit.
As mentioned above, just well the present invention can be implemented.
Claims (7)
1. the enlarge leadingly formula Novel recording system based on audio power amplifying circuit, it is characterized in that, primarily of microprocessor, the storer be connected with microprocessor respectively, modular converter, audio frequency filtering circuit and timer, the pre-amplification circuit be connected with modular converter, the audio collection module be connected with pre-amplification circuit, the audio power amplifying circuit be connected with audio frequency filtering circuit, and the loudspeaker be connected with audio power amplifying circuit forms; Described audio collection module is also connected with microprocessor.
2. a kind of enlarge leadingly formula Novel recording system based on audio power amplifying circuit according to claim 1, it is characterized in that: described audio power amplifying circuit is by amplifier P4, triode VT9, triode VT10, negative pole is connected with the positive pole of amplifier P4, positive pole then forms the electric capacity C10 of the input end of this audio power amplifying circuit, one end is connected with the negative pole of amplifier P4, the resistance R16 of other end ground connection, N pole is connected with the emitter of triode VT10, the diode D6 that P pole is then connected with the positive pole of amplifier P4 after potentiometer R17, be serially connected in the resistance R18 between the collector of triode VT10 and the output terminal of amplifier P4, be serially connected in the resistance R19 between the emitter of triode VT10 and the emitter of triode VT9, and positive pole is connected with the emitter of triode VT10, the electric capacity C11 that negative pole then forms the output terminal of this audio power amplifying circuit forms, grounded collector, its base stage of described triode VT9 are connected with the base stage of triode VT10, the output terminal of described amplifier P4 is connected with the base stage of triode VT9, the P pole of described diode D6 is also connected with the control end of potentiometer R17, the input end of described audio power amplifying circuit is connected with the output terminal of audio frequency filtering circuit, its output terminal is then connected with loudspeaker.
3. a kind of enlarge leadingly formula Novel recording system based on audio power amplifying circuit according to claim 2, it is characterized in that: described pre-amplification circuit is by amplifier P1, amplifier P2, XOR gate P3, triode VT8, negative pole is connected with the positive pole of amplifier P1 after resistance R10, positive pole then forms the electric capacity C5 of the input end of this pre-amplification circuit, be serially connected in the resistance R9 between the negative pole of electric capacity C5 and the positive pole of XOR gate P3, one end is connected with the negative pole of XOR gate P3, the resistance R12 of other end ground connection, be serially connected in the resistance R11 between the positive pole of amplifier P1 and output terminal, positive pole is connected with the positive pole of amplifier P1, the electric capacity C6 that negative pole is then connected with the output terminal of amplifier P1, positive pole is connected with the negative pole of amplifier P1, the electric capacity C7 of minus earth, positive pole is connected with the positive pole of electric capacity C7, the electric capacity C8 that negative pole is then connected with the base stage of triode VT8, be serially connected in the resistance R13 between the collector of triode VT8 and the output terminal of XOR gate P3, positive pole is connected with the collector of triode VT8, the electric capacity C9 that negative pole is then connected with the output terminal of XOR gate P3, N pole is connected with the negative pole of amplifier P2, the diode D5 that P pole is then connected with the collector of triode VT8, be serially connected in the resistance R14 between the output terminal of amplifier P1 and the positive pole of amplifier P2, and the resistance R15 be serially connected between the output terminal of amplifier P1 and the output terminal of amplifier P2 forms, the emitter of described triode VT8 is connected with the output terminal of amplifier P1, the output terminal of described amplifier P2 then forms the output terminal of this pre-amplification circuit and is connected with the input end of modular converter, the input end of described pre-amplification circuit is then connected with audio collection module.
4. a kind of enlarge leadingly formula Novel recording system based on audio power amplifying circuit according to claim 3, is characterized in that: described audio frequency filtering circuit is by differential amplifier circuit, and the suppression circuit be connected with differential amplifier circuit output terminal forms; The input end of described differential amplifier circuit is connected with microprocessor, suppresses the output terminal of circuit to be then connected with the input end of audio power amplifying circuit.
5. a kind of enlarge leadingly formula Novel recording system based on audio power amplifying circuit according to claim 4, it is characterized in that: described differential amplifier circuit is by triode VT1, triode VT2, triode VT3, the electric capacity C1 that negative pole is connected with the base stage of triode VT1 after resistance R1, positive pole then forms the input end of this differential amplifier circuit, the diode D1 that P pole is connected with the collector of triode VT1, N pole connects+20V voltage, and the potentiometer R2 be serially connected between the emitter of triode VT1 and the base stage of triode VT3 forms; The control end of described potentiometer is connected with suppression circuit; The base stage of described triode VT3 is connected with the collector of triode VT2, its emitter is then connected with suppression circuit, its grounded collector; The emitter of described triode VT2 is connected with the collector of triode VT1, its base stage is then connected with suppression circuit.
6. a kind of enlarge leadingly formula Novel recording system based on audio power amplifying circuit according to claim 5, it is characterized in that: described suppression circuit is by filtering chip U, triode VT4, triode VT5, triode VT6, triode VT7, one end is connected with the N pole of diode D1, the resistance R4 that the other end is then connected with the VDD pin of filtering chip U after resistance R5, positive pole is connected with the tie point of resistance R5 with resistance R4, the electric capacity C2 that negative pole is then connected with the base stage of triode VT2, N pole is connected with the VDD pin of filtering chip U, the diode D2 that P pole is then connected with the base stage of triode VT2, one end is connected with the EN pin of filtering chip U, the resistance R3 that the other end is then connected with the emitter of triode VT3, positive pole is connected with the base stage of triode VT5 after resistance R6, the electric capacity C4 that negative pole is then connected with the collector of triode VT5, N pole is connected with the positive pole of electric capacity C4, the diode D3 that P pole is then connected with the DRV pin of filtering chip U, N pole is connected with the emitter of triode VT5, the diode D4 that P pole is then connected with the emitter of triode VT7 after resistance R7, positive pole is connected with the FB pin of filtering chip U, the electric capacity C3 that negative pole is then connected with the P pole of diode D4, and the resistance R8 be serially connected between the base stage of triode VT7 and collector forms, the TOFF pin of described filtering chip U is connected with the control end of potentiometer R2, its COMP pin is then connected with the emitter of triode VT3, its VSS pin is connected with the base stage of triode VT6, its CS pin is then connected with the base stage of triode VT4, the emitter of described triode VT6 is connected with the negative pole of electric capacity C3, its collector is then connected with the base stage of triode VT7, the collector of described triode VT7 is connected with-20V voltage, the output terminal that the emitter of described triode VT4 is connected with the base stage of triode VT5, its collector then forms this suppression circuit.
7. a kind of enlarge leadingly formula Novel recording system based on audio power amplifying circuit according to claim 6, is characterized in that: described filtering chip U is UCT4392 integrated chip.
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| CN201510855994.XA CN105321545A (en) | 2015-11-27 | 2015-11-27 | Pre-amplification type novel recording system based on audio power amplification circuit |
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| CN201510855994.XA CN105321545A (en) | 2015-11-27 | 2015-11-27 | Pre-amplification type novel recording system based on audio power amplification circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110533966A (en) * | 2019-10-14 | 2019-12-03 | 郑州铁路职业技术学院 | A kind of Foreigh-language oral-speech correction system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110533966A (en) * | 2019-10-14 | 2019-12-03 | 郑州铁路职业技术学院 | A kind of Foreigh-language oral-speech correction system |
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Application publication date: 20160210 |