CN107680628A - A kind of buffer protection catalog system for electrical teaching - Google Patents
A kind of buffer protection catalog system for electrical teaching Download PDFInfo
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- CN107680628A CN107680628A CN201711082315.5A CN201711082315A CN107680628A CN 107680628 A CN107680628 A CN 107680628A CN 201711082315 A CN201711082315 A CN 201711082315A CN 107680628 A CN107680628 A CN 107680628A
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/16—Storage of analogue signals in digital stores using an arrangement comprising analogue/digital [A/D] converters, digital memories and digital/analogue [D/A] converters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
- G11B2020/10537—Audio or video recording
- G11B2020/10546—Audio or video recording specifically adapted for audio data
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
- G11B2020/1062—Data buffering arrangements, e.g. recording or playback buffers
- G11B2020/10675—Data buffering arrangements, e.g. recording or playback buffers aspects of buffer control
- G11B2020/10685—Data buffering arrangements, e.g. recording or playback buffers aspects of buffer control input interface, i.e. the way data enter the buffer, e.g. by informing the sender that the buffer is busy
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of buffer protection catalog system for electrical teaching; it is characterized in that; mainly by microprocessor; memory, analog to digital conversion circuit, audio filter circuit and the timer being connected respectively with microprocessor; the audio collection module being connected with analog to digital conversion circuit; the Audio Buffer circuit being connected with audio filter circuit, and the loudspeaker composition being connected with Audio Buffer circuit；The audio collection module is also connected with microprocessor；The present invention can be suppressed to interfering noise and retain the audio signal of needs, therefore can improve the definition of recording broadcasting.Audio signal is converted to digital electric signal by the present invention by analog to digital conversion circuit, the high conversion efficiency of the analog to digital conversion circuit, and signal conversion is more thorough, so as to improve the treatment effeciency of the present invention.
Description
Technical field
The present invention relates to a kind of recording system, in particular to a kind of buffer protection catalog system for electrical teaching.
Background technology
At present, with the needs of scientific and technological development and people's routine work, study and life, sound pick-up outfit has turned into each
The essential appliance and electronic in individual field.
However, existing sound pick-up outfit can all be recorded various sound in recording, it is carried out to audio signal
Impurity audio can not be suppressed well during processing, therefore can be disturbed when people listen back to recording by very big noise；
And the loudspeaker of existing sound pick-up outfit is easily impacted and damaged by signal.
The content of the invention
It is an object of the invention to overcome existing sound pick-up outfit not suppress well to impurity audio, and raise one's voice
A kind of the defects of device is easily impacted and damaged by signal, there is provided buffer protection catalog system for electrical teaching.
The purpose of the present invention is achieved through the following technical solutions：A kind of buffer protection catalog system for electrical teaching, mainly by microprocessor
Device, the memory being connected respectively with microprocessor, analog to digital conversion circuit, audio filter circuit and timer, with analog-to-digital conversion
The audio collection module that circuit is connected, the Audio Buffer circuit being connected with audio filter circuit, and it is electric with Audio Buffer
The loudspeaker composition that road is connected；The audio collection module is also connected with microprocessor；Analog-digital conversion circuit as described is by putting
Big device P1, amplifier P2, amplifier P3, amplifier P4, triode VT8, one end is connected with amplifier P1 positive pole, the other end
Resistance R9, the P pole for forming the input of the analog to digital conversion circuit is connected with amplifier P1 output end, N poles then with amplifier
The diode D6 that P2 positive pole is connected, the resistance R11 being serially connected between amplifier P1 negative pole and diode D6 N poles, just
Pole is connected with diode D6 N poles, electric capacity C5, the N pole of negative pole ground connection is connected with electric capacity C5 negative pole, P poles are then through resistance
The diode D5 being connected after R10 with amplifier P1 negative pole, the resistance being serially connected between amplifier P2 negative pole and output end
R13, the resistance R12 being serially connected between triode VT8 base stage and amplifier P4 output end, the output of negative pole and amplifier P2
End be connected, electric capacity C6, the N pole that positive pole is connected with amplifier P3 positive pole is connected with amplifier P4 positive pole, P poles then with
The diode D7 that amplifier P3 positive pole is connected, one end is connected with amplifier P3 negative pole, the resistance of other end ground connection
R14, and the resistance R15 compositions being serially connected between amplifier P3 output end and amplifier P4 negative pole；The triode VT8
Positive pole then with amplifier P2 of grounded collector, its emitter stage be connected；The negative pole of the amplifier P4 forms the modulus and turned
Change the output end of circuit and be connected with microprocessor；The input of analog-digital conversion circuit as described is connected with audio collection module
Connect.
The Audio Buffer circuit is connected including amplifier P101, P pole with amplifier P101 negative pole, N poles are through resistance
The diode D101 being connected after R103 with amplifier P101 output end, positive pole is connected with diode D101 P poles, negative pole
The electric capacity C102 being connected with amplifier P101 output end, one end is connected with amplifier P101 negative pole, other end ground connection
Resistance R102, one end is connected with amplifier P101 positive pole, the resistance R101, positive pole and amplifier P101 of other end ground connection
Positive power source terminal be connected, negative pole ground connection electric capacity C103, negative pole is connected with amplifier P101 positive pole, positive pole and audio filter
The electric capacity C101 that wave circuit is connected, and the resistance R104 being serially connected between amplifier P101 output end and loudspeaker；Institute
The positive power source terminal and negative power end for stating amplifier P101 connect power supply.
The audio filter circuit is by differential amplifier circuit, the suppression circuit group being connected with differential amplifier circuit output end
Into；The input of the differential amplifier circuit is connected with microprocessor, the output end of suppression circuit then with Audio Buffer circuit
It is connected.
The differential amplifier circuit by triode VT1, triode VT2, triode VT3, negative pole after resistance R1 with three poles
Pipe VT1 base stage is connected, positive pole then formed the differential amplifier circuit input electric capacity C1, P pole and triode VT1 collection
Electrode is connected, N poles meet the diode D1 of+20V voltages, and is serially connected in triode VT1 emitter stage and triode VT3 base
Potentiometer R2 compositions between pole；The control terminal of the potentiometer is connected with suppression circuit；The base stage of the triode VT3 with
Triode VT2 colelctor electrode is connected, its emitter stage is then connected with suppression circuit, its grounded collector；The triode VT2
Emitter stage be connected with triode VT1 colelctor electrode, its base stage is then connected with suppression circuit.
The suppression circuit is by filtering chip U, triode VT4, triode VT5, triode VT6, triode VT7, one end
It is connected with diode D1 N poles, the resistance R4 that the other end is then connected after resistance R5 with filtering chip U VDD pins, just
Pole is connected with resistance R4 and resistance R5 tie point, negative pole is then connected with triode VT2 base stage electric capacity C2, N pole with
The diode D2 that filtering chip U VDD pins are connected, P poles are then connected with triode VT2 base stage, one end and filtering core
The resistance R3 that piece U EN pins are connected, the other end is then connected with triode VT3 emitter stage, positive pole after resistance R6 with
Triode VT5 base stage is connected, negative pole is then connected with triode VT5 colelctor electrode electric capacity C4, N pole with electric capacity C4 just
Diode D3, the N pole that pole is connected, P poles are then connected with filtering chip U DRV pins is connected with triode VT5 emitter stage
Connect, the diode D4 that P poles are then connected after resistance R7 with triode VT7 emitter stage, the FB pins of positive pole and filtering chip U
It is connected, the electric capacity C3 that negative pole is then connected with diode D4 P poles, and is serially connected in triode VT7 base stage and colelctor electrode
Between resistance R8 composition；The TOFF pins of the filtering chip U are connected with potentiometer R2 control terminal, its COMP pin then
Be connected with triode VT3 emitter stage, its VSS pin is connected with triode VT6 base stage, its CS pin then with triode
VT4 base stage is connected；The emitter stage of the triode VT6 is connected with electric capacity C3 negative pole, its colelctor electrode then with triode
VT7 base stage is connected；The colelctor electrode of the triode VT7 is connected with -20V voltages；The emitter stage of the triode VT4 with
Triode VT5 base stage is connected, its colelctor electrode then forms the output end of the suppression circuit.
The filtering chip U is UCT4392 integrated chips.
The present invention compared with the prior art, has advantages below and beneficial effect：
(1) present invention can be suppressed to interfering noise and retain the audio signal of needs, therefore can improve recording
The definition of broadcasting.
(2) present invention is provided with timer, and the timer can set recording starting time and recording dwell time, work as record
Sound starting time can then automatically begin to record, and be automatically stopped according to the recording dwell time set, can so make this
The application of invention is wider.
(3) audio signal is converted to digital electric signal by the present invention by analog to digital conversion circuit, the analog to digital conversion circuit
High conversion efficiency, and signal conversion is more thorough, so as to improve the treatment effeciency of the present invention.
(4) Audio Buffer circuit of the invention can enter row buffering to signal, avoid loudspeaker from being impacted and damage by signal
It is bad.
Brief description of the drawings
Fig. 1 is the overall structure block diagram of the present invention.
Fig. 2 is the structure chart of the audio filter circuit of the present invention.
Fig. 3 is the structure chart of the analog to digital conversion circuit of the present invention.
Fig. 4 is the structure chart of the Audio Buffer circuit of the present invention.
Embodiment
The present invention is described in further detail with reference to embodiment, but embodiments of the present invention are not limited to
This.
Embodiment
As shown in figure 1, the Novel recording system of the present invention, mainly by microprocessor, is connected with microprocessor respectively
Memory, analog to digital conversion circuit, audio filter circuit and timer, the audio collection module being connected with analog to digital conversion circuit,
The frequency buffer circuit being connected with audio filter circuit, and the loudspeaker composition being connected with frequency buffer circuit.The audio
Acquisition module is also connected with microprocessor.
Wherein, audio collection module is used for the audio signal for gathering the external world, and it is limited that Wei Lin sections of Shenzhen science and technology can be selected in it
The SV-2602 sound acquisition modules of company's production are realized.Analog to digital conversion circuit is used to the audio signal collected be converted to
Digital electric signal is simultaneously sent to microprocessor.For microprocessor then as the control centre for invention, it preferentially uses AT89S52 master
Chip is controlled to realize.Timer is used to set record length, and memory is then used to store collected audio signal.Audio is filtered
Wave circuit can suppress to noise signals present in audio signal, to improve the definition for exporting sound.The timer,
Memory and loudspeaker can be achieved using existing technology.
As shown in Fig. 2 the audio filter circuit can suppress to the noise signals collected, it is by differential amplification
Circuit, the suppression circuit composition being connected with differential amplifier circuit output end.The input and Wei Chu of the differential amplifier circuit
Reason device is connected, and the output end of suppression circuit is then connected with Audio Buffer circuit.
The differential amplifier circuit can be handled the audio signal collected, and it is by triode VT1, triode
VT2, triode VT3, resistance R1, electric capacity C1, potentiometer R2 and diode D1 are formed.
During connection, electric capacity C1 negative pole is connected after resistance R1 with triode VT1 base stage, its positive pole then forms the difference
Divide the input of amplifying circuit.Diode D1 P poles are connected with triode VT1 colelctor electrode, its N pole connects+20V voltages.Electricity
Position device R2 is then serially connected between triode VT1 emitter stage and triode VT3 base stage.The control terminal of the potentiometer and suppression
Circuit is connected；The base stage of the triode VT3 is connected with triode VT2 colelctor electrode, its emitter stage then with suppression circuit
It is connected, its grounded collector.The emitter stage of the triode VT2 is connected with triode VT1 colelctor electrode, its base stage then with
Suppression circuit is connected.
Audio signal input first filters after coming in through electric capacity C1, then is inputed to after resistance R1 by triode VT1 and three poles
The difference amplifier that pipe VT2 is formed is amplified.Resistance R1 is biasing resistor, and it can avoid audio signal in amplification
During there is the existing picture of distortion.Diode D1 is the common P poles diode of the difference amplifier, which determines the differential amplifier circuit
Common-mode rejection ratio and this grade static working current size.
The suppression circuit is 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 compositions.
During connection, resistance R4 one end is connected with diode D1 N poles, its other end is then after resistance R5 with filtering core
Piece U VDD pins are connected.Electric capacity C2 positive pole is connected with resistance R4 and resistance R5 tie point, its negative pole then with three poles
Pipe VT2 base stage is connected.Diode D2 N poles are connected with filtering chip U VDD pins, its P pole then with triode VT2
Base stage be connected.Resistance R3 one end is connected with filtering chip U EN pins, its other end then hair with triode VT3
Emitter-base bandgap grading is connected.Electric capacity C4 positive pole is connected after resistance R6 with triode VT5 base stage, its negative pole then with triode VT5
Colelctor electrode be connected.Diode D3 N poles are connected with electric capacity C4 positive pole, its P pole then DRV pins with filtering chip U
It is connected.Diode D4 N poles are connected with triode VT5 emitter stage, its P pole is then after resistance R7 with triode VT7's
Emitter stage is connected.Electric capacity C3 positive pole is connected with filtering chip U FB pins, its negative pole then P poles phase with diode D4
Connection.Resistance R8 is then serially connected between triode VT7 base stage and colelctor electrode.
Meanwhile the TOFF pins of the filtering chip U are connected with potentiometer R2 control terminal, its COMP pin is then with three
Pole pipe VT3 emitter stage is connected, its VSS pin is connected with triode VT6 base stage, its CS pin then with triode VT4
Base stage be connected.The emitter stage of the triode VT6 is connected with electric capacity C3 negative pole, its colelctor electrode then with triode VT7
Base stage be connected.The colelctor electrode of the triode VT7 is connected with -20V voltages.The emitter stage and three of the triode VT4
Pole pipe VT5 base stage is connected, its colelctor electrode then forms the output end of the suppression circuit and is connected with Audio Buffer circuit.
Electric capacity C3, triode VT6, triode VT7, resistance R7 and resistance R8 form a constant-current source circuit, and it is given
Filtering chip U provides constant operating current.Audio signal is conveyed into after filtering chip U, because of the useful audio in audio signal
Signal is different from the frequency of noise signals, and filtering chip U protects to accounting for most useful audio signal in audio signal
Stay, and to noise signals suppress, therefore what is exported from filtering chip U CS pins is useful audio signal, should
The high-pass filtering circuit that useful audio signal is formed via triode VT4, triode VT5, resistance R6 and electric capacity C4 is carried out
Exported after filtering and give Audio Buffer circuit.In order to reach more preferable implementation result, filtering chip U is preferably that UCT4392 is integrated
Chip is realized.
As shown in figure 4, Audio Buffer circuit is connected including amplifier P101, P pole with amplifier P101 negative pole, N poles
The diode D101 being connected after resistance R103 with amplifier P101 output end, positive pole are extremely connected with diode D101 P
Connect, the electric capacity C102 that negative pole is connected with amplifier P101 output end, one end is connected with amplifier P101 negative pole, is another
The resistance R102 of ground connection is held, one end is connected with amplifier P101 positive pole, the resistance R101 of other end ground connection, positive pole and amplification
Device P101 positive power source terminal is connected, negative pole ground connection electric capacity C103, negative pole is connected with amplifier P101 positive pole, positive pole and
The electric capacity C101 that audio filter circuit is connected, and the resistance being serially connected between amplifier P101 output end and loudspeaker
R104；The positive power source terminal and negative power end of the amplifier P101 connects power supply.Amplifier P101, diode D101, resistance
R103 and electric capacity C102 is collectively forming a buffer, and it can enter row buffering to audio signal, avoid loudspeaker by signal
Impact and damage.
As shown in figure 3, the analog to digital conversion circuit is by amplifier P1, amplifier P2, amplifier P3, amplifier P4, triode
VT8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, electric capacity C5, electric capacity C6, two poles
Pipe D5, diode D6 and diode D7 are formed.
Wherein, amplifier P1, resistance R9, resistance R10, resistance R11, diode D5 and diode D6 form an amplification
Filter circuit.During connection, resistance R9 one end is connected with amplifier P1 positive pole, its other end forms the analog to digital conversion circuit
Input and be connected with audio collection module.Diode D6 P poles are connected with amplifier P1 output end, its N pole then
It is connected with amplifier P2 positive pole.Resistance R11 is then serially connected between amplifier P1 negative pole and diode D6 N poles.Electric capacity
C5 positive pole is connected with diode D6 N poles, its negative pole ground connection.Diode D5 N poles are connected with electric capacity C5 negative pole, it
Negative pole of the P poles then with amplifier P1 after resistance R10 is connected.The filtering and amplifying circuit is amplified the audio signal of input
Filtering process.
In addition, resistance R13 is serially connected between amplifier P2 negative pole and output end.Resistance R12 is serially connected in triode VT8's
Between base stage and amplifier P4 output end.Electric capacity C6 negative pole is connected with amplifier P2 output end, its positive pole is with amplifying
Device P3 positive pole is connected.Diode D7 N poles are connected with amplifier P4 positive pole, its P pole then positive pole with amplifier P3
It is connected.Resistance R14 one end is connected with amplifier P3 negative pole, its other end ground connection.Resistance R15 is serially connected in amplifier P3
Output end and amplifier P4 negative pole between.Meanwhile the grounded collector of the triode VT8, its emitter stage then with amplification
Device P2 positive pole is connected.The negative pole of the amplifier P4 forms the output end of the analog to digital conversion circuit and is connected with microprocessor
Connect.
Amplifier P2 and resistance R13 forms a buffering isolation circuit.Amplifier P3, amplifier P4 and diode D7
A change-over circuit is then formed, audio signal is converted to digital electric signal and exported by the change-over circuit.The buffering isolation circuit is then
Play a part of to form a connecting link, it can avoid audio signal from the existing picture being lost occur in the filtering and amplifying circuit of prime, and can be with
Ensure that the digital electric signal after change-over circuit conversion is undistorted.
During work, operator sets recording starting time and recording dwell time in timer, when recording starting time
Then microprocessor sends a signal to audio collection module, and the audio collection module starts the extraneous audio signal of collection and conveying
To analog to digital conversion circuit.The audio signal collected is converted to digital electric signal and is transferred to microprocessor by the analog to digital conversion circuit
Device, and the memory then stores to audio signal.When record dwell time to after microprocessor send a signal to audio and adopt
Collect module and stop recording.When needing to play out the audio recorded, audio signal is then sent to audio by microprocessor
Filter circuit, the audio signal are played after audio filter circuit and Audio Buffer circuit by loudspeaker.
As described above, the present invention can be implemented well.
Claims (5)
1. a kind of buffer protection catalog system for electrical teaching, it is characterised in that mainly by microprocessor, be connected respectively with microprocessor
Memory, analog to digital conversion circuit, audio filter circuit and timer, the audio collection module being connected with analog to digital conversion circuit,
The Audio Buffer circuit being connected with audio filter circuit, and the loudspeaker composition being connected with Audio Buffer circuit；It is described
Audio collection module is also connected with microprocessor；Analog-digital conversion circuit as described by amplifier P1, amplifier P2, amplifier P3,
Amplifier P4, triode VT8, one end is connected with amplifier P1 positive pole, the other end forms the input of the analog to digital conversion circuit
Resistance R9, the P pole at end is connected with amplifier P1 output end, the diode D6 that N poles are then connected with amplifier P2 positive pole,
The resistance R11 being serially connected between amplifier P1 negative pole and diode D6 N poles, positive pole are connected with diode D6 N poles, born
Electric capacity C5, the N pole of pole ground connection is connected with electric capacity C5 negative pole, negative pole of the P poles then with amplifier P1 after resistance R10 is connected
Diode D5, the resistance R13 being serially connected between amplifier P2 negative pole and output end, be serially connected in triode VT8 base stage and
Resistance R12 between amplifier P4 output end, negative pole is connected with amplifier P2 output end, positive pole and amplifier P3 just
Electric capacity C6, the N pole that pole is connected is connected with amplifier P4 positive pole, two poles that P poles are then connected with amplifier P3 positive pole
Pipe D7, one end is connected with amplifier P3 negative pole, the resistance R14 of other end ground connection, and is serially connected in amplifier P3 output
Resistance R15 compositions between end and amplifier P4 negative pole；The grounded collector of the triode VT8, its emitter stage are then with putting
Big device P2 positive pole is connected；The negative pole of the amplifier P4 formed the output end of the analog to digital conversion circuit and with microprocessor phase
Connection；The input of analog-digital conversion circuit as described is connected with audio collection module；
The Audio Buffer circuit is connected including amplifier P101, P pole with amplifier P101 negative pole, N poles are through resistance R103
The diode D101 being connected afterwards with amplifier P101 output end, positive pole is connected with diode D101 P poles, negative pole is with putting
The electric capacity C102 that big device P101 output end is connected, one end is connected with amplifier P101 negative pole, the electricity of other end ground connection
R102 is hindered, one end is connected with amplifier P101 positive pole, the resistance R101 of other end ground connection, and positive pole and amplifier P101 are just
Power end is connected, the electric capacity C103 of negative pole ground connection, and negative pole is connected with amplifier P101 positive pole, positive pole and audio filtered electrical
The electric capacity C101 that road is connected, and the resistance R104 being serially connected between amplifier P101 output end and loudspeaker；It is described to put
Big device P101 positive power source terminal and negative power end connects power supply.
A kind of 2. buffer protection catalog system for electrical teaching according to claim 1, it is characterised in that：The audio filter circuit by
Differential amplifier circuit, the suppression circuit composition being connected with differential amplifier circuit output end；The input of the differential amplifier circuit
End is connected with microprocessor, and the output end of suppression circuit is then connected with Audio Buffer circuit.
A kind of 3. buffer protection catalog system for electrical teaching according to claim 2, it is characterised in that：The differential amplifier circuit by
Triode VT1, triode VT2, triode VT3, negative pole is connected after resistance R1 with triode VT1 base stage, positive pole then shape
Into electric capacity C1, the P pole of the input of the differential amplifier circuit is connected with triode VT1 colelctor electrode, N poles connect+20V voltages
Diode D1, and the potentiometer R2 compositions being serially connected between triode VT1 emitter stage and triode VT3 base stage；It is described
The control terminal of potentiometer is connected with suppression circuit；The base stage of the triode VT3 is connected with triode VT2 colelctor electrode,
Its emitter stage is then connected with suppression circuit, its grounded collector；The emitter stage of the triode VT2 and triode VT1 collection
Electrode is connected, its base stage is then connected with suppression circuit.
A kind of 4. buffer protection catalog system for electrical teaching according to claim 3, it is characterised in that：The suppression circuit is by filtering
Chip U, triode VT4, triode VT5, triode VT6, triode VT7, one end are connected with diode D1 N poles, are another
Hold the resistance R4 being then connected after resistance R5 with filtering chip U VDD pins, the tie point of positive pole and resistance R4 and resistance R5
It is connected, electric capacity C2, the N pole that negative pole is then connected with triode VT2 base stage is connected with filtering chip U VDD pins, P
The diode D2 that pole is then connected with triode VT2 base stage, one end is connected with filtering chip U EN pins, the other end then
The resistance R3 being connected with triode VT3 emitter stage, positive pole is connected after resistance R6 with triode VT5 base stage, negative pole
Electric capacity C4, the N pole being then connected with triode VT5 colelctor electrode is connected with electric capacity C4 positive pole, P poles then with filtering chip U
Diode D3, the N pole that is connected of DRV pins be connected with triode VT5 emitter stage, P poles then after resistance R7 with three poles
The diode D4 that pipe VT7 emitter stage is connected, positive pole is connected with filtering chip U FB pins, negative pole then with diode D4
The electric capacity C3 that is connected of P poles, and resistance R8 compositions being serially connected between triode VT7 base stage and colelctor electrode；The filter
Ripple chip U TOFF pins are connected with potentiometer R2 control terminal, its emitter stage of COMP pins then with triode VT3 is connected
Connect, its VSS pin is connected with triode VT6 base stage, its base stage of CS pins then with triode VT4 is connected；Described three
Pole pipe VT6 emitter stage is connected with electric capacity C3 negative pole, base stage of its colelctor electrode then with triode VT7 is connected；Described three
Pole pipe VT7 colelctor electrode is connected with -20V voltages；The emitter stage of the triode VT4 is connected with triode VT5 base stage,
Its colelctor electrode then forms the output end of the suppression circuit.
A kind of 5. buffer protection catalog system for electrical teaching according to claim 4, it is characterised in that：The filtering chip U is
UCT4392 integrated chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711082315.5A CN107680628A (en) | 2017-11-07 | 2017-11-07 | A kind of buffer protection catalog system for electrical teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711082315.5A CN107680628A (en) | 2017-11-07 | 2017-11-07 | A kind of buffer protection catalog system for electrical teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107680628A true CN107680628A (en) | 2018-02-09 |
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ID=61145667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711082315.5A Pending CN107680628A (en) | 2017-11-07 | 2017-11-07 | A kind of buffer protection catalog system for electrical teaching |
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| Country | Link |
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| CN (1) | CN107680628A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112804617A (en) * | 2021-01-04 | 2021-05-14 | 科大乾延科技有限公司 | Intelligent audio acquisition and processing system |
-
2017
- 2017-11-07 CN CN201711082315.5A patent/CN107680628A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112804617A (en) * | 2021-01-04 | 2021-05-14 | 科大乾延科技有限公司 | Intelligent audio acquisition and processing system |
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Application publication date: 20180209 |