CN105141264A - Dual-track audio frequency amplifying circuit - Google Patents
Dual-track audio frequency amplifying circuit Download PDFInfo
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- CN105141264A CN105141264A CN201510606161.XA CN201510606161A CN105141264A CN 105141264 A CN105141264 A CN 105141264A CN 201510606161 A CN201510606161 A CN 201510606161A CN 105141264 A CN105141264 A CN 105141264A
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Abstract
The invention discloses a dual-track audio frequency amplifying circuit which comprises a low-power audio amplifier IC1 and a dual-track audio frequency playing circuit. The low-power audio amplifier IC1 is connected with the dual-track audio frequency playing circuit, and carries out power amplification on minute audio frequency signals. The dual-track audio frequency playing circuit restores the audio frequency signals obtained after power amplification into dual-track sounds for playing. The dual-track audio frequency amplifying circuit is specially designed to amplify the minute audio frequency signals and restore the minute audio frequency signals into sound signals, the received audio frequency signals can be amplified and restored into the sound signals with high fidelity and high gains, the whole circuit has the advantages of being simple in structure, economical, practical and the like, and the stereophonic sound audio frequency effect can be achieved.
Description
Technical field
The present invention relates to electronic circuit technology field, specifically, is a kind of dual-channel audio amplifying circuit.
Background technology
The object of audio frequency amplifier is the audio signal of rebuilding input on sonorific output element, and signal volume and power stage all want desirable---strictly according to the facts, effectively and distortion is low.Audiorange is about 20Hz ~ 20kHz, and therefore amplifier must have good frequency response (smaller during the loud speaker driving frequency band limited, as bass horn or loudspeaker) within the scope of this.According to the difference of application, watt level is widely different, several watts from the milliwatt level of earphone to TV or PC audio frequency, tens watts that arrive " mini " home stereo and automobile audio again, until more than hundreds of watts of more powerful family expenses and commercial sound system, large to the sound requirement that can meet whole cinema or auditorium.
A kind of simple analog implementation of audio frequency amplifier is the transistor adopting linear model, obtains the output voltage proportional with input voltage.Forward voltage gain usually very high (at least 40dB).If feedback loop comprises forward gain, then whole ring gain is also very high.Because high loop gain energy improving SNR, can suppress by the non-linear distortion caused of forward path, and reduce power supply noise, so often adopt feedback by improving power supply rejection ability (PSR).
Summary of the invention
The object of the present invention is to provide a kind of dual-channel audio amplifying circuit, for small audio signal is amplified, and be reduced to voice signal, and the specially designed audio amplifier circuit with dual track function, received audio signal being amplified of energy high-fidelity, high-gain is reduced to voice signal, whole circuit has the characteristics such as structure is simple, economical and practical, can obtain stereo sound yupin effect.
The present invention is achieved through the following technical solutions: a kind of dual-channel audio amplifying circuit, comprise low-power audio amplifier IC1 and dual-channel audio playing circuit, described low-power audio amplifier IC1 connects dual-channel audio playing circuit, and small audio signal is carried out power amplification by described low-power audio amplifier IC1; Audio signal after power amplification is reduced to binaural sound and plays by described dual-channel audio playing circuit.
Further to better implement the present invention, be arranged to following structure especially: on described low-power audio amplifier IC1, be also provided with front end input circuit, described front end input circuit comprises the first sound channel input circuit and second sound channel input circuit, on 5 pin that described first sound channel input circuit is connected to low-power audio amplifier IC1 and 6 pin; On 7 pin that described second sound channel input circuit is connected to low-power audio amplifier IC1 and 8 pin.
Further to better implement the present invention, be arranged to following structure especially: described first sound channel input circuit comprises the reverse input circuit of the first sound channel and the first sound channel input circuit in the same way, the reverse input circuit of described first sound channel comprises electric capacity C6, and described electric capacity C6 is connected on 5 pin of low-power audio amplifier IC1; Described first sound channel in the same way input circuit comprises resistance R2, electric capacity C4, resistance R5, and described resistance R2 connects electric capacity C4, described electric capacity C4 contact resistance R5, and electric capacity C4 and resistance R5 is all connected to 6 pin of low-power audio amplifier IC1; Described first sound channel input circuit is also provided with potentiometer W2, and the adjustable end of described potentiometer W2 is connected with resistance R2, and a stiff end of described potentiometer W2 is connected with resistance R5 and electric capacity C6 respectively.
Further to better implement the present invention, be arranged to following structure especially: described second sound channel input circuit comprises the reverse input circuit of second sound channel and second sound channel input circuit in the same way, the reverse input circuit of described second sound channel comprises electric capacity C5, and described electric capacity C5 is connected on 8 pin of low-power audio amplifier IC1; Described first sound channel in the same way input circuit comprises resistance R1, electric capacity C2, resistance R7, and described resistance R1 connects electric capacity C2, described electric capacity C2 contact resistance R7, and electric capacity C2 and resistance R7 is all connected to 7 pin of low-power audio amplifier IC1; Described second sound channel input circuit is also provided with potentiometer W1, and the adjustable end of described potentiometer W1 is connected with resistance R1, and a stiff end of described potentiometer W1 is connected with resistance R7 and electric capacity C5 respectively.
Further to better implement the present invention, be arranged to following structure especially: described dual-channel audio playing circuit comprises first sound channel audio playing circuit and second sound channel audio playing circuit, described first sound channel audio playing circuit connects 3 pin of low-power audio amplifier IC1, and described second sound channel audio playing circuit connects 2 pin of low-power audio amplifier IC1.
Further to better implement the present invention, be arranged to following structure especially: described first sound channel audio playing circuit comprises resistance R3, electric capacity C8, electric capacity C7 and loud speaker RA, one end of described loud speaker RA is connected with 1 pin of low-power audio amplifier IC1 by electric capacity C8, and the other end of described loud speaker RA is connected with 1 pin of low-power audio amplifier IC1 by electric capacity C7 and resistance R3.
Further to better implement the present invention, be arranged to following structure especially: described second sound channel audio playing circuit comprises resistance R4, electric capacity C10, electric capacity C9 and loud speaker RB, one end of described loud speaker RB is connected with 3 pin of low-power audio amplifier IC1 by electric capacity C10, and the other end of described loud speaker RB is connected with 3 pin of low-power audio amplifier IC1 by electric capacity C9 and resistance R4.
Further to better implement the present invention, following structure is arranged to especially: described capacitance C5, electric capacity C6, electric capacity C8 and electric capacity C10 all adopt electrochemical capacitor.
Further to better implement the present invention, following structure is arranged to especially: one end all ground connection that one end that described loud speaker RB is connected with electric capacity C9 and loud speaker RA are connected with electric capacity C7.
The present invention compared with prior art, has the following advantages and beneficial effect:
Small audio signal is amplified by the present invention, and be reduced to voice signal, and the specially designed audio amplifier circuit with dual track function, received audio signal being amplified of energy high-fidelity, high-gain is reduced to voice signal, whole circuit has the characteristics such as structure is simple, economical and practical, can obtain stereo sound yupin effect.
Accompanying drawing explanation
Fig. 1 is schematic diagram 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 thereto.
Embodiment 1:
A kind of dual-channel audio amplifying circuit, for small audio signal is amplified, and be reduced to voice signal, and the specially designed audio amplifier circuit with dual track function, energy high-fidelity, received audio signal being amplified of high-gain is reduced to voice signal, it is simple that whole circuit has structure, the characteristic such as economical and practical, stereo sound yupin effect can be obtained, as shown in Figure 1, be provided with following structure especially: comprise low-power audio amplifier IC1 and dual-channel audio playing circuit, described low-power audio amplifier IC1 connects dual-channel audio playing circuit, small audio signal is carried out power amplification by described low-power audio amplifier IC1, audio signal after power amplification is reduced to binaural sound and plays by described dual-channel audio playing circuit.
Embodiment 2:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, be arranged to following structure especially: on described low-power audio amplifier IC1, be also provided with front end input circuit, described front end input circuit comprises the first sound channel input circuit and second sound channel input circuit, on 5 pin that described first sound channel input circuit is connected to low-power audio amplifier IC1 and 6 pin; On 7 pin that described second sound channel input circuit is connected to low-power audio amplifier IC1 and 8 pin.
Embodiment 3:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, be arranged to following structure especially: described first sound channel input circuit comprises the reverse input circuit of the first sound channel and the first sound channel input circuit in the same way, the reverse input circuit of described first sound channel comprises electric capacity C6, and described electric capacity C6 is connected on 5 pin of low-power audio amplifier IC1; Described first sound channel in the same way input circuit comprises resistance R2, electric capacity C4, resistance R5, and described resistance R2 connects electric capacity C4, described electric capacity C4 contact resistance R5, and electric capacity C4 and resistance R5 is all connected to 6 pin of low-power audio amplifier IC1; Described first sound channel input circuit is also provided with potentiometer W2, and the adjustable end of described potentiometer W2 is connected with resistance R2, and a stiff end of described potentiometer W2 is connected with resistance R5 and electric capacity C6 respectively.
Embodiment 4:
The present embodiment is the enterprising one-step optimization in basis in embodiment 2 or 3, further to better implement the present invention, as shown in Figure 1, be arranged to following structure especially: described second sound channel input circuit comprises the reverse input circuit of second sound channel and second sound channel input circuit in the same way, the reverse input circuit of described second sound channel comprises electric capacity C5, and described electric capacity C5 is connected on 8 pin of low-power audio amplifier IC1; Described first sound channel in the same way input circuit comprises resistance R1, electric capacity C2, resistance R7, and described resistance R1 connects electric capacity C2, described electric capacity C2 contact resistance R7, and electric capacity C2 and resistance R7 is all connected to 7 pin of low-power audio amplifier IC1; Described second sound channel input circuit is also provided with potentiometer W1, and the adjustable end of described potentiometer W1 is connected with resistance R1, and a stiff end of described potentiometer W1 is connected with resistance R7 and electric capacity C5 respectively.
Embodiment 5:
The present embodiment is at the enterprising one-step optimization in the basis of above-mentioned any embodiment, further to better implement the present invention, as shown in Figure 1, be arranged to following structure especially: described dual-channel audio playing circuit comprises first sound channel audio playing circuit and second sound channel audio playing circuit, described first sound channel audio playing circuit connects 3 pin of low-power audio amplifier IC1, and described second sound channel audio playing circuit connects 2 pin of low-power audio amplifier IC1.
Embodiment 6:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, be arranged to following structure especially: described first sound channel audio playing circuit comprises resistance R3, electric capacity C8, electric capacity C7 and loud speaker RA, one end of described loud speaker RA is connected with 1 pin of low-power audio amplifier IC1 by electric capacity C8, and the other end of described loud speaker RA is connected with 1 pin of low-power audio amplifier IC1 by electric capacity C7 and resistance R3.
Embodiment 7:
The present embodiment is the enterprising one-step optimization in basis in embodiment 5 or 6, further to better implement the present invention, as shown in Figure 1, be arranged to following structure especially: described second sound channel audio playing circuit comprises resistance R4, electric capacity C10, electric capacity C9 and loud speaker RB, one end of described loud speaker RB is connected with 3 pin of low-power audio amplifier IC1 by electric capacity C10, and the other end of described loud speaker RB is connected with 3 pin of low-power audio amplifier IC1 by electric capacity C9 and resistance R4.
Embodiment 8:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, is arranged to following structure especially: described capacitance C5, electric capacity C6, electric capacity C8 and electric capacity C10 all adopt electrochemical capacitor; The positive electrode of described capacitance C5 connects 8 pin of low-power audio amplifier IC1, the positive electrode of electric capacity C6 connects 5 pin of low-power audio amplifier IC1, the positive electrode of electric capacity C8 connects 1 pin of low-power audio amplifier IC1, and the positive electrode of electric capacity C10 connects 4 pin of low-power audio amplifier IC1.
Embodiment 9:
The present embodiment is the enterprising one-step optimization in basis in embodiment 7 or 8, further to better implement the present invention, as shown in Figure 1, following structure is arranged to especially: one end all ground connection that one end that described loud speaker RB is connected with electric capacity C9 and loud speaker RA are connected with electric capacity C7.
In use, left channel audio signal L-IN accesses through another stiff end of potentiometer W1; Right channel audio signal R-IN accesses through another stiff end of potentiometer W2.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.
Claims (9)
1. a dual-channel audio amplifying circuit, it is characterized in that: comprise low-power audio amplifier IC1 and dual-channel audio playing circuit, described low-power audio amplifier IC1 connects dual-channel audio playing circuit, and small audio signal is carried out power amplification by described low-power audio amplifier IC1; Audio signal after power amplification is reduced to binaural sound and plays by described dual-channel audio playing circuit.
2. a kind of dual-channel audio amplifying circuit according to claim 1, it is characterized in that: on described low-power audio amplifier IC1, be also provided with front end input circuit, described front end input circuit comprises the first sound channel input circuit and second sound channel input circuit, on 5 pin that described first sound channel input circuit is connected to low-power audio amplifier IC1 and 6 pin; On 7 pin that described second sound channel input circuit is connected to low-power audio amplifier IC1 and 8 pin.
3. a kind of dual-channel audio amplifying circuit according to claim 2, it is characterized in that: described first sound channel input circuit comprises the reverse input circuit of the first sound channel and the first sound channel input circuit in the same way, the reverse input circuit of described first sound channel comprises electric capacity C6, and described electric capacity C6 is connected on 5 pin of low-power audio amplifier IC1; Described first sound channel in the same way input circuit comprises resistance R2, electric capacity C4, resistance R5, and described resistance R2 connects electric capacity C4, described electric capacity C4 contact resistance R5, and electric capacity C4 and resistance R5 is all connected to 6 pin of low-power audio amplifier IC1; Described first sound channel input circuit is also provided with potentiometer W2, and the adjustable end of described potentiometer W2 is connected with resistance R2, and a stiff end of described potentiometer W2 is connected with resistance R5 and electric capacity C6 respectively.
4. a kind of dual-channel audio amplifying circuit according to Claims 2 or 3, it is characterized in that: described second sound channel input circuit comprises the reverse input circuit of second sound channel and second sound channel input circuit in the same way, the reverse input circuit of described second sound channel comprises electric capacity C5, and described electric capacity C5 is connected on 8 pin of low-power audio amplifier IC1; Described first sound channel in the same way input circuit comprises resistance R1, electric capacity C2, resistance R7, and described resistance R1 connects electric capacity C2, described electric capacity C2 contact resistance R7, and electric capacity C2 and resistance R7 is all connected to 7 pin of low-power audio amplifier IC1; Described second sound channel input circuit is also provided with potentiometer W1, and the adjustable end of described potentiometer W1 is connected with resistance R1, and a stiff end of described potentiometer W1 is connected with resistance R7 and electric capacity C5 respectively.
5. a kind of dual-channel audio amplifying circuit according to claim 4, it is characterized in that: described dual-channel audio playing circuit comprises first sound channel audio playing circuit and second sound channel audio playing circuit, described first sound channel audio playing circuit connects 3 pin of low-power audio amplifier IC1, and described second sound channel audio playing circuit connects 2 pin of low-power audio amplifier IC1.
6. a kind of dual-channel audio amplifying circuit according to claim 5, it is characterized in that: described first sound channel audio playing circuit comprises resistance R3, electric capacity C8, electric capacity C7 and loud speaker RA, one end of described loud speaker RA is connected with 1 pin of low-power audio amplifier IC1 by electric capacity C8, and the other end of described loud speaker RA is connected with 1 pin of low-power audio amplifier IC1 by electric capacity C7 and resistance R3.
7. a kind of dual-channel audio amplifying circuit according to claim 5 or 6, it is characterized in that: described second sound channel audio playing circuit comprises resistance R4, electric capacity C10, electric capacity C9 and loud speaker RB, one end of described loud speaker RB is connected with 3 pin of low-power audio amplifier IC1 by electric capacity C10, and the other end of described loud speaker RB is connected with 3 pin of low-power audio amplifier IC1 by electric capacity C9 and resistance R4.
8. a kind of dual-channel audio amplifying circuit according to claim 7, is characterized in that: described capacitance C5, electric capacity C6, electric capacity C8 and electric capacity C10 all adopt electrochemical capacitor.
9. a kind of dual-channel audio amplifying circuit according to claim 8, is characterized in that: one end all ground connection that one end that described loud speaker RB is connected with electric capacity C9 and loud speaker RA are connected with electric capacity C7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510606161.XA CN105141264A (en) | 2015-09-22 | 2015-09-22 | Dual-track audio frequency amplifying circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510606161.XA CN105141264A (en) | 2015-09-22 | 2015-09-22 | Dual-track audio frequency amplifying circuit |
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| CN105141264A true CN105141264A (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510606161.XA Pending CN105141264A (en) | 2015-09-22 | 2015-09-22 | Dual-track audio frequency amplifying circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040124926A1 (en) * | 2002-12-18 | 2004-07-01 | Kang Dong Min | Microwave power amplifier |
| CN201266908Y (en) * | 2008-07-31 | 2009-07-01 | 曹胜强 | D-genus power amplification circuit |
| CN204993809U (en) * | 2015-09-22 | 2016-01-20 | 成都乐维斯科技有限公司 | Dual track audio power amplifier circuit |
-
2015
- 2015-09-22 CN CN201510606161.XA patent/CN105141264A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040124926A1 (en) * | 2002-12-18 | 2004-07-01 | Kang Dong Min | Microwave power amplifier |
| CN201266908Y (en) * | 2008-07-31 | 2009-07-01 | 曹胜强 | D-genus power amplification circuit |
| CN204993809U (en) * | 2015-09-22 | 2016-01-20 | 成都乐维斯科技有限公司 | Dual track audio power amplifier circuit |
Non-Patent Citations (1)
| Title |
|---|
| 李昌禄等: "基于TDA2822的小型有源双声道音箱的设计与制作", 《高校实验室工作研究》 * |
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Application publication date: 20151209 |
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