CN104967963A - Audio amplifier integrated circuit - Google Patents
Audio amplifier integrated circuit Download PDFInfo
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- CN104967963A CN104967963A CN201510375361.9A CN201510375361A CN104967963A CN 104967963 A CN104967963 A CN 104967963A CN 201510375361 A CN201510375361 A CN 201510375361A CN 104967963 A CN104967963 A CN 104967963A
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Abstract
The invention discloses an audio amplifier integrated circuit which comprises a microphone, an amplifier circuit and a headphone. The microphone is connected with the amplifier circuit. The output end of the amplifier circuit is connected with the headphone sequentially through an output interface of the circuit and an input interface of the headphone. The amplifier circuit comprises an amplifier chip LM386, a resistor, an adjustable resistor, capacitors from first to eighth, a frequency response selection switch and a power supply. According to the invention, by improving the design of the existing audio amplifier integrated circuit, the number of electrical appliance components of a hearing aid can be reduced, and the use experience of a patient is improved.
Description
Technical field
The invention discloses a kind of audio frequency amplification circuit, relate to electronic integrated circuit design field.
Background technology
In the ear that hearing aids is arranged on user usually or after ear, think user's voice emplifying.Some common types of hearing aids comprise worm behind ear (BTE) hearing aids, inner ear type (ITE) hearing aids, duct-type (ITC) hearing aids, completely duct-type (CIC) hearing aids etc.Hearing aids comprises a hearing aids shell usually, can hold a plastic frame in described hearing aids shell, and this plastic frame is for supporting and keeping one to be in printed circuit board (PCB) (PCB) in hearing aids shell in ideal position.This printed circuit board (PCB) may be provided in a signal processing circuit or other circuit or element that can provide or need in hearing aids.Because desirable hearing aids is usually less, so the space in hearing aids is normally limited.Therefore, may need reduce the quantity of required component in hearing aids or reduce the size of these assemblies.In addition, reduce component count or reduce component size and can allow to improve the efficiency of assembling during these assemblies, to realize required hearing aids.
Summary of the invention
Technical problem to be solved by this invention is: for the defect of prior art, provides a kind of audio frequency amplification circuit, can reduce the electric elements component count of hearing aids, improving the experience of patient by improving the design of existing audio frequency amplification circuit.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of audio frequency amplification circuit, comprise microphone, amplifying circuit and earphone, described microphone is connected with amplifying circuit, and the output of amplifying circuit is connected with earphone after earphone input interface through oversampling circuit output interface successively, wherein,
Described amplifying circuit comprises amplifier chip LM386, resistance, adjustable resistance, the first to the 8th electric capacity, frequency response selector switch and power supply; First output of microphone is connected with second pin of amplifier chip LM386, one end of the 7th electric capacity, the positive pole of power supply respectively, second output of microphone is connected with one end of resistance, one end of the first electric capacity respectively, and the 3rd output of microphone is connected and ground connection with one end of one end of one end of the other end of resistance, adjustable resistance, the second electric capacity, the 3rd electric capacity, one end of the 4th electric capacity, the 7th pin of large device chip LM386, the 6th pin of large device chip LM386, the other end of the 7th electric capacity, the negative pole of power supply respectively; The other end of the first electric capacity is connected with the other end of adjustable resistance, and the adjustable end of adjustable resistance is connected through frequency response selector switch one end with the 5th electric capacity, and the other end of the 5th electric capacity is connected with first pin of large device chip LM386; Second, third, the other end of the 4th resistance selects contact a, b, c to be connected with frequency response respectively; 3rd pin of large device chip LM386 is connected through the 4th pin of the 6th electric capacity with large device chip LM386; 5th pin of large device chip LM386 is connected with circuit output interface through the 8th electric capacity.
As present invention further optimization scheme, described 5th electric capacity, the 6th electric capacity are polar capacitor.
As present invention further optimization scheme, the size of described 6th electric capacity is 10 μ F.
As present invention further optimization scheme, described 5th electric capacity is output coupling capacitor.
As present invention further optimization scheme, described 7th electric capacity is power supply coupling capacitor.
As present invention further optimization scheme, the model of described microphone is CSZ-9.
The present invention adopts above technical scheme compared with prior art, has following technique effect: the present invention can reduce the electric elements component count of hearing aids by improving the design of existing audio frequency amplification circuit, improve the experience of patient.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present invention,
Wherein: R1 is resistance, R2 is adjustable resistance, and C1 to C8 is the first to the 8th electric capacity, and S is frequency response selector switch, and BP is microphone, and BL is earphone, and XJ is circuit output interface, and XP is earphone input interface, and V is power supply.
Embodiment
Be described below in detail embodiments of the present invention, the example of described execution mode is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the execution mode be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
Circuit structure diagram of the present invention as shown in Figure 1, described audio frequency amplification circuit, comprise microphone, amplifying circuit and earphone, described microphone is connected with amplifying circuit, and the output of amplifying circuit is connected with earphone after earphone input interface through oversampling circuit output interface successively, and described amplifying circuit comprises amplifier chip LM386, resistance, adjustable resistance, the first to the 8th electric capacity, frequency response selector switch and power supply; First output of microphone is connected with second pin of amplifier chip LM386, one end of the 7th electric capacity, the positive pole of power supply respectively, second output of microphone is connected with one end of resistance, one end of the first electric capacity respectively, and the 3rd output of microphone is connected and ground connection with one end of one end of one end of the other end of resistance, adjustable resistance, the second electric capacity, the 3rd electric capacity, one end of the 4th electric capacity, the 7th pin of large device chip LM386, the 6th pin of large device chip LM386, the other end of the 7th electric capacity, the negative pole of power supply respectively; The other end of the first electric capacity is connected with the other end of adjustable resistance, and the adjustable end of adjustable resistance is connected through frequency response selector switch one end with the 5th electric capacity, and the other end of the 5th electric capacity is connected with first pin of large device chip LM386; Second, third, the other end of the 4th resistance selects contact a, b, c to be connected with frequency response respectively; 3rd pin of large device chip LM386 is connected through the 4th pin of the 6th electric capacity with large device chip LM386; 5th pin of large device chip LM386 is connected with circuit output interface through the 8th electric capacity.
In one particular embodiment of the present invention, described 5th electric capacity, the 6th electric capacity are polar capacitor; The size of described 6th electric capacity is 10 μ F; Described 5th electric capacity is output coupling capacitor; Described 7th electric capacity is power supply coupling capacitor; The model of described microphone is CSZ-9.
The microminiature sound amplifier that hearing aids is mainly made up of miniature pick-up (microphone), amplifier and earphone three part.Although the circuit structure of hearing aids and general sound amplifier are comparatively similar in form, the two require difference.Sound amplifier is that hearing aids then designs according to the aphonia characteristic sum degree of deafness patient by the earshot of normal person and range design.Although general hearing aids requires do not have sound amplifier so high to frequency response, harmonic distortion, noise etc., amplifier progression is also less than sound amplifier, but all there is certain requirement to relevant performance pointer, the sound transmission gain of usual hearing aids will at about 15 ~ 55dB, frequency response is at 100 ~ 600Hz, and the distortion factor is less than 10% ~ 15%.Obvious employing LM386 integrated package is satisfiable.LM386 high frequency response can reach 300kHz, and when supply voltage scope is 1 ~ 6V, its static power source is 4mA, is applicable to powered battery.
In figure, LM386 is connected to non-inverting amplifier circuit.3,4 pin are connected to 10 μ F electric capacity, therefore circuit gain is put to maximum.The reason done like this is that the gain of LM386 is not too large, also not enough, especially obvious when microphone sensitivity is poor for surplus during hearing aids, turns down gain and usually can not meet the demands.Microphone signal, by coupling, from output after LM386 amplifies, then promotes earphone sounding, and adjustable resistance is used for volume adjusting.When frequency response selector switch is placed in a, b, c position, corresponding circuit frequency response is 3000,4500 and about 6000Hz respectively, and this frequency response selection circuit is actually a capacitance fade circuit.The object arranging it is the frequency response of compressor circuit, weakens and eliminate audio frequency component and noise that aurally handicapped do not need, to promote clearness and to alleviate the sense of fatigue of ear.C5 is output coupling capacitor, and C7 is power supply coupling capacitor.
By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned execution mode, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from present inventive concept.The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to technical spirit of the present invention, within the spirit and principles in the present invention, to any simple amendment that above embodiment is done, equivalent replacement and improvement etc., within the protection range all still belonging to technical solution of the present invention.
Claims (6)
1. an audio frequency amplification circuit, is characterized in that: comprise microphone, amplifying circuit and earphone, and described microphone is connected with amplifying circuit, and the output of amplifying circuit is connected with earphone after earphone input interface through oversampling circuit output interface successively, wherein,
Described amplifying circuit comprises amplifier chip LM386, resistance, adjustable resistance, the first to the 8th electric capacity, frequency response selector switch and power supply; First output of microphone is connected with second pin of amplifier chip LM386, one end of the 7th electric capacity, the positive pole of power supply respectively, second output of microphone is connected with one end of resistance, one end of the first electric capacity respectively, and the 3rd output of microphone is connected and ground connection with one end of one end of one end of the other end of resistance, adjustable resistance, the second electric capacity, the 3rd electric capacity, one end of the 4th electric capacity, the 7th pin of large device chip LM386, the 6th pin of large device chip LM386, the other end of the 7th electric capacity, the negative pole of power supply respectively; The other end of the first electric capacity is connected with the other end of adjustable resistance, and the adjustable end of adjustable resistance is connected through frequency response selector switch one end with the 5th electric capacity, and the other end of the 5th electric capacity is connected with first pin of large device chip LM386; Second, third, the other end of the 4th resistance selects contact a, b, c to be connected with frequency response respectively; 3rd pin of large device chip LM386 is connected through the 4th pin of the 6th electric capacity with large device chip LM386; 5th pin of large device chip LM386 is connected with circuit output interface through the 8th electric capacity.
2. a kind of audio frequency amplification circuit as claimed in claim 1, is characterized in that: described 5th electric capacity, the 6th electric capacity are polar capacitor.
3. a kind of audio frequency amplification circuit as claimed in claim 1, is characterized in that: the size of described 6th electric capacity is 10 μ F.
4. a kind of audio frequency amplification circuit as claimed in claim 1, is characterized in that: described 5th electric capacity is output coupling capacitor.
5. a kind of audio frequency amplification circuit as claimed in claim 1, is characterized in that: described 7th electric capacity is power supply coupling capacitor.
6. a kind of audio frequency amplification circuit as claimed in claim 1, is characterized in that: the model of described microphone is CSZ-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510375361.9A CN104967963A (en) | 2015-06-30 | 2015-06-30 | Audio amplifier integrated circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510375361.9A CN104967963A (en) | 2015-06-30 | 2015-06-30 | Audio amplifier integrated circuit |
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| CN104967963A true CN104967963A (en) | 2015-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510375361.9A Pending CN104967963A (en) | 2015-06-30 | 2015-06-30 | Audio amplifier integrated circuit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000003538A1 (en) * | 1998-07-09 | 2000-01-20 | Sarnoff Corporation | Television tuner employing micro-electro-mechanically-switched tuning matrix |
| CN2369436Y (en) * | 1999-02-06 | 2000-03-15 | 王信伟 | Adjustable ultrahigh frequency compensator |
| CN2733486Y (en) * | 2003-10-24 | 2005-10-12 | 张常年 | Multifunctional learning aid |
| CN1868428A (en) * | 2005-05-23 | 2006-11-29 | 李刚 | Wrist type deaf-person sound-identification device by using tactile sensation and visual sense to substitute for auditory sense |
| CN201373889Y (en) * | 2009-03-31 | 2009-12-30 | 常熟理工学院 | Low-voltage large-current harmonic source |
| CN202019342U (en) * | 2011-05-13 | 2011-10-26 | 河南华南医电科技有限公司 | Heart sound amplifying circuit based on MAX4465 and LM386 |
-
2015
- 2015-06-30 CN CN201510375361.9A patent/CN104967963A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000003538A1 (en) * | 1998-07-09 | 2000-01-20 | Sarnoff Corporation | Television tuner employing micro-electro-mechanically-switched tuning matrix |
| CN2369436Y (en) * | 1999-02-06 | 2000-03-15 | 王信伟 | Adjustable ultrahigh frequency compensator |
| CN2733486Y (en) * | 2003-10-24 | 2005-10-12 | 张常年 | Multifunctional learning aid |
| CN1868428A (en) * | 2005-05-23 | 2006-11-29 | 李刚 | Wrist type deaf-person sound-identification device by using tactile sensation and visual sense to substitute for auditory sense |
| CN201373889Y (en) * | 2009-03-31 | 2009-12-30 | 常熟理工学院 | Low-voltage large-current harmonic source |
| CN202019342U (en) * | 2011-05-13 | 2011-10-26 | 河南华南医电科技有限公司 | Heart sound amplifying circuit based on MAX4465 and LM386 |
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