CN204615772U - A kind of audio power amplifying circuit - Google Patents
A kind of audio power amplifying circuit Download PDFInfo
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- CN204615772U CN204615772U CN201520184133.9U CN201520184133U CN204615772U CN 204615772 U CN204615772 U CN 204615772U CN 201520184133 U CN201520184133 U CN 201520184133U CN 204615772 U CN204615772 U CN 204615772U
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Abstract
The utility model relates to power amplifier technology field, especially a kind of audio power amplifying circuit.It comprises integrated operational amplifier, the first diode, the second diode, the first transistor, transistor seconds, third transistor, the 4th transistor, the first potentiometer, the second potentiometer and the 3rd potentiometer.Circuit structure of the present utility model forms OCL power amplification circuit by integrated operational amplifier, transistor and peripheral component, the first transistor is to the 4th transistor composition combined type complementary symmetry circuit, carry out conditioning and the amplified current of signal, strengthen power output; Offset the internal electric field of the first transistor and third transistor emitter by the conduction voltage drop on the first diode, the second diode and the 3rd potentiometer, thus eliminate intermodulation distortion; 12 resistance and the 3rd electric capacity form the high-frequency self-excitation that weakening network eliminates output loading end.This circuit has the features such as reliable and stable, noise is low, driving force is strong, has wide application prospects and use value.
Description
Technical field
The utility model relates to power amplifier technology field, especially a kind of audio power amplifying circuit.
Background technology
The effect of audio amplifier circuit is amplified by audio input signal, then exports and drive loud speaker.Too high for audio input signal, the output signal of audio power amplifying circuit, by the distortion of generation output signal, is unfavorable for that the amplification of signal drives; Time too low for input signal, power amplification circuit power stage is not enough, can not give full play to the effect of power amplifier.In addition, the high-frequency self-excitation that the output loading end of power amplification circuit exists can have an impact to circuit.
Utility model content
For above-mentioned the deficiencies in the prior art, the purpose of this utility model be to provide a kind of driving force high, undistorted, export that to promote power large and can eliminate the OCL audio power amplifying circuit of the high-frequency self-excitation of output loading end.
To achieve these goals, the utility model adopts following technical scheme:
A kind of audio power amplifying circuit, it comprises integrated operational amplifier, the first transistor, transistor seconds, third transistor, the 4th transistor, the first potentiometer, the second potentiometer and the 3rd potentiometer;
The IN-end of described integrated operational amplifier is successively by the second resistance and the second capacity earth, IN-end also connects the second stiff end of described second potentiometer by the 3rd resistance, IN+ end connects the adjustable end of described first potentiometer by the first electric capacity, IN+ end also connects the second stiff end of described first potentiometer by the first resistance, V+ end connects+12V voltage, V-end connects-12V voltage, OUT end is connected the V-end of integrated operational amplifier successively with the 5th resistance by the first diode, OUT end also connects the second stiff end of described 3rd potentiometer by the second diode,
The base stage of described the first transistor connect the first stiff end of described 3rd potentiometer and connect the V+ end of described integrated operational amplifier by the 4th resistance, the base stage that V+ hold, emitter is connected described transistor seconds of collector electrode and integrated operational amplifier that collector electrode connects described transistor seconds respectively by the tenth resistance is also connected the emitter of described third transistor successively with the 11 resistance by the 6th resistance;
The emitter of described transistor seconds connects the collector electrode of described 4th transistor by the 8th resistance;
The base stage that the base stage of described third transistor connects the positive pole of described first diode, collector electrode connects described 4th transistor also connects the V-end of described integrated operational amplifier by the 7th resistance;
The collector electrode of described 4th transistor connect the first stiff end of described second potentiometer and be connected between described 6th resistance and the 11 resistance, emitter connects described integrated operational amplifier V-end by the 9th resistance;
First stiff end of described first potentiometer connects audio input end, the second stiff end ground connection;
First stiff end of described second potentiometer is connected to an input of loud speaker and passes through the 12 resistance and the 3rd capacity earth successively.
Preferably, described integrated operational amplifier is uA741 type operational amplifier.
Preferably, described first diode and the second diode are IN4001 type diode.
Owing to have employed such scheme, circuit structure of the present utility model forms OCL power amplification circuit by integrated operational amplifier, transistor and peripheral component.The first transistor forms multiple tube to the 4th transistor, improves the multiplication factor of electric current, increases to export to promote power; Offset the internal electric field of the first transistor and third transistor emitter by the conduction voltage drop on the first diode, the second diode and the 3rd potentiometer, thus eliminate intermodulation distortion; 12 resistance and the 3rd electric capacity form the high-frequency self-excitation that weakening network eliminates output loading end.This circuit stability is reliable, has the features such as driving force is strong, noise is low, undistorted, has wide application prospects and use value.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Figure 1, a kind of audio power amplifying circuit of the present embodiment, it comprises integrated operational amplifier U, the first transistor Q1, transistor seconds Q2, third transistor Q3, the 4th transistor Q4, the first potentiometer PR1, the second potentiometer PR2 and the 3rd potentiometer PR3; Wherein, integrated operational amplifier U is uA741 type operational amplifier, and the first diode and the second diode are IN4001 type diode.
The IN-end of integrated operational amplifier U is successively by the second resistance R2 and the second electric capacity C2 ground connection, IN-end also connects the second stiff end b2 of the second potentiometer PR2 by the 3rd resistance R3, IN+ end connects the adjustable end a of the first potentiometer PR1 by the first electric capacity C1, IN+ end also connects the second stiff end a2 of the first potentiometer PR1 by the first resistance R1, V+ end connects+12V voltage, V-end connects-12V voltage, OUT end is connected the V-end of integrated operational amplifier U successively with the 5th resistance R5 by the first diode D1, OUT end also connects the second stiff end c2 of the 3rd potentiometer PR3 by the second diode D2.
The base stage of the first transistor Q1 connect the first stiff end c1 of the 3rd potentiometer PR3 and connect the V+ end of integrated operational amplifier U by the 4th resistance R4, the base stage that V+ hold, emitter is connected transistor seconds Q2 of collector electrode and integrated operational amplifier U that collector electrode connects transistor seconds Q2 respectively by the tenth resistance R10 is also connected the emitter of third transistor Q3 successively with the 11 resistance R11 by the 6th resistance R6.
The emitter of transistor seconds Q2 connects the collector electrode of the 4th transistor Q4 by the 8th resistance R8;
The base stage that the base stage of third transistor Q3 connects the positive pole of the first diode D1, collector electrode connects the 4th transistor Q4 also connects the V-end of integrated operational amplifier U by the 7th resistance R7.
The collector electrode of the 4th transistor Q4 connect the first stiff end b1 of the second potentiometer PR2 and be connected between the 6th resistance R6 and the 11 resistance R11, emitter connects integrated operational amplifier U V-end by the 9th resistance R9.
The first stiff end a1 of the first potentiometer PR1 connects audio input end, the second stiff end a2 ground connection.
The first stiff end b1 of the second potentiometer PR2 is connected to an input of loud speaker RL and passes through the 12 resistance R12 and the 3rd electric capacity C3 ground connection successively.
This circuit is made up of uA741 type operational amplifier, transistor and peripheral component, by ± 12V Power supply, belong to OCL power amplification circuit.
Because the input signal of this circuit is too high, the distortion of easy generation output signal, therefore the in-phase input end that the signal that audio frequency inputs need introduce integrated operational amplifier U after the first potentiometer PR1 dividing potential drop carries out the amplification of signal and suppresses temperature drift, afterwards through the first diode D1, second diode D2,3rd potentiometer PR3 and the first transistor Q1 carries out conditioning and the amplified current of signal to the combined type complementary symmetry circuit that the 4th transistor Q4 forms, and the final loud speaker RL that promotes sounds.
Meanwhile, by part signal through the second potentiometer PR2 and the second resistance R2, the 3rd resistance R3, is incorporated into the inverting input of integrated operational amplifier U, constitutes series voltage negtive backword on the one hand, plays regulated output voltage, improves the effect of input resistance; Combine with integrated operational amplifier U on the other hand and form in-phase proportion computing circuit, by adjusting the second potentiometer PR2 and the second resistance R2, the 3rd resistance R3 parameter, can regulate the voltage gain of this amplifying circuit.
Further, the integrated operational amplifier U of the present embodiment adopts the uA741 type operational amplifier that is made up of input stage, intergrade, output stage and biasing circuit of internal structure to improve the driving force of circuit.
Further, the internal electric field of the first transistor Q1 and third transistor Q3 emitter is offset by the conduction voltage drop on the first diode D1, the second diode D2 and the 3rd potentiometer PR3, under making quiescent conditions, these two transistors are in critical conduction mode, eliminate intermodulation distortion.
Further, the first transistor Q1 and third transistor Q3 constitutes Class B complementary symmetry power amplifier circuit, the first transistor Q1, transistor seconds Q2, third transistor Q3 and the 4th transistor Q4 constitute multiple tube (also claiming Darlington transistor), improve the current amplification factor of transistor, strengthen to export and promote power, the each conducting half period of the first transistor Q1 and third transistor Q3 in the one-period of sinusoidal ac signal, i.e. the first transistor Q1 conducting in the positive half cycle of signal and third transistor Q3 cut-off; Third transistor Q3 conducting in the negative half-cycle of signal and the first transistor Q1 ends, carries out the amplification of signal.
Further, 6th resistance R6, the 7th resistance R7 are for reducing the penetrating current of multiple tube, improve the stability of circuit, 8th resistance R8, the 9th resistance R9 are direct current negative feedback resistor, improve the performance of power amplification circuit, and the tenth resistance R10, the 11 resistance R11 are balance resistance, make the output of the first transistor Q1, third transistor Q3 symmetrical, 12 resistance R12, the 3rd electric capacity C3 form weakening network, and output equivalent load can be made to be resistive, eliminate the high-frequency self-excitation of output loading end.
In sum, the circuit stability of the present embodiment is reliable, has the features such as driving force is strong, noise is low, undistorted, has wide application prospects and use value.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (3)
1. an audio power amplifying circuit, is characterized in that: it comprises integrated operational amplifier, the first transistor, transistor seconds, third transistor, the 4th transistor, the first potentiometer, the second potentiometer and the 3rd potentiometer;
The IN-end of described integrated operational amplifier is successively by the second resistance and the second capacity earth, IN-end also connects the second stiff end of described second potentiometer by the 3rd resistance, IN+ end connects the adjustable end of described first potentiometer by the first electric capacity, IN+ end also connects the second stiff end of described first potentiometer by the first resistance, V+ end connects+12V voltage, V-end connects-12V voltage, OUT end is connected the V-end of integrated operational amplifier successively with the 5th resistance by the first diode, OUT end also connects the second stiff end of described 3rd potentiometer by the second diode,
The base stage of described the first transistor connect the first stiff end of described 3rd potentiometer and connect the V+ end of described integrated operational amplifier by the 4th resistance, the base stage that V+ hold, emitter is connected described transistor seconds of collector electrode and integrated operational amplifier that collector electrode connects described transistor seconds respectively by the tenth resistance is also connected the emitter of described third transistor successively with the 11 resistance by the 6th resistance;
The emitter of described transistor seconds connects the collector electrode of described 4th transistor by the 8th resistance;
The base stage that the base stage of described third transistor connects the positive pole of described first diode, collector electrode connects described 4th transistor also connects the V-end of described integrated operational amplifier by the 7th resistance;
The collector electrode of described 4th transistor connect the first stiff end of described second potentiometer and be connected between described 6th resistance and the 11 resistance, emitter connects described integrated operational amplifier V-end by the 9th resistance;
First stiff end of described first potentiometer connects audio input end, the second stiff end ground connection;
First stiff end of described second potentiometer is connected to an input of loud speaker and passes through the 12 resistance and the 3rd capacity earth successively.
2. a kind of audio power amplifying circuit as claimed in claim 1, is characterized in that: described integrated operational amplifier is uA741 type operational amplifier.
3. a kind of audio power amplifying circuit as claimed in claim 1, is characterized in that: described first diode and the second diode are IN4001 type diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520184133.9U CN204615772U (en) | 2015-03-30 | 2015-03-30 | A kind of audio power amplifying circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520184133.9U CN204615772U (en) | 2015-03-30 | 2015-03-30 | A kind of audio power amplifying circuit |
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| CN204615772U true CN204615772U (en) | 2015-09-02 |
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| CN201520184133.9U Active CN204615772U (en) | 2015-03-30 | 2015-03-30 | A kind of audio power amplifying circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810133A (en) * | 2016-05-19 | 2016-07-27 | 成都零线科技有限公司 | Information display simulation system for bullet train station |
| CN105845147A (en) * | 2016-05-19 | 2016-08-10 | 成都零线科技有限公司 | Motor car broadcast simulation system |
| CN106057209A (en) * | 2016-05-19 | 2016-10-26 | 成都零线科技有限公司 | Airport broadcasting system |
| CN109450387A (en) * | 2018-12-17 | 2019-03-08 | 天津三源兴泰微电子技术有限公司 | A kind of integrated operational amplifier circuit for audio player |
| CN110161420A (en) * | 2019-06-28 | 2019-08-23 | 安徽江淮汽车集团股份有限公司 | A kind of fuel cell car block terminal detection circuit and detection device |
| CN114285305A (en) * | 2021-12-28 | 2022-04-05 | 佛山市联动科技股份有限公司 | Differential alternating current power supply device and method |
-
2015
- 2015-03-30 CN CN201520184133.9U patent/CN204615772U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810133A (en) * | 2016-05-19 | 2016-07-27 | 成都零线科技有限公司 | Information display simulation system for bullet train station |
| CN105845147A (en) * | 2016-05-19 | 2016-08-10 | 成都零线科技有限公司 | Motor car broadcast simulation system |
| CN106057209A (en) * | 2016-05-19 | 2016-10-26 | 成都零线科技有限公司 | Airport broadcasting system |
| CN109450387A (en) * | 2018-12-17 | 2019-03-08 | 天津三源兴泰微电子技术有限公司 | A kind of integrated operational amplifier circuit for audio player |
| CN109450387B (en) * | 2018-12-17 | 2023-10-13 | 天津三源兴泰微电子技术有限公司 | Integrated operational amplifier circuit for audio player |
| CN110161420A (en) * | 2019-06-28 | 2019-08-23 | 安徽江淮汽车集团股份有限公司 | A kind of fuel cell car block terminal detection circuit and detection device |
| CN114285305A (en) * | 2021-12-28 | 2022-04-05 | 佛山市联动科技股份有限公司 | Differential alternating current power supply device and method |
| CN114285305B (en) * | 2021-12-28 | 2022-10-04 | 佛山市联动科技股份有限公司 | Differential alternating current power supply device and method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518000 4 building, 8 new material harbor, Changyuan middle 2, Nanshan District, Shenzhen, Guangdong. Patentee after: Shenzhen Rui Jun semiconductor Limited by Share Ltd Address before: 518000 4 building, 8 new material harbor, Changyuan middle 2, Nanshan District, Shenzhen, Guangdong. Patentee before: Shenzhen Ruichips Semiconductor Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Audio power amplifier circuit Effective date of registration: 20180719 Granted publication date: 20150902 Pledgee: Shenzhen SME financing Company limited by guarantee Pledgor: Shenzhen Rui Jun semiconductor Limited by Share Ltd Registration number: 2018990000573 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20190604 Granted publication date: 20150902 Pledgee: Shenzhen SME financing Company limited by guarantee Pledgor: Shenzhen Rui Jun semiconductor Limited by Share Ltd Registration number: 2018990000573 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Audio power amplifier circuit Effective date of registration: 20190604 Granted publication date: 20150902 Pledgee: Shenzhen SME financing Company limited by guarantee Pledgor: Shenzhen Rui Jun semiconductor Limited by Share Ltd Registration number: 2019990000511 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20201023 Granted publication date: 20150902 Pledgee: Shenzhen SME financing Company limited by guarantee Pledgor: SHENZHEN RUICHIPS SEMICONDUCTOR Co.,Ltd. Registration number: 2019990000511 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |