CN201369813Y - Audio power amplification circuit with constant output power selectability - Google Patents
Audio power amplification circuit with constant output power selectability Download PDFInfo
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- CN201369813Y CN201369813Y CNU2008202304938U CN200820230493U CN201369813Y CN 201369813 Y CN201369813 Y CN 201369813Y CN U2008202304938 U CNU2008202304938 U CN U2008202304938U CN 200820230493 U CN200820230493 U CN 200820230493U CN 201369813 Y CN201369813 Y CN 201369813Y
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Abstract
The utility model relates to an audio power amplification circuit with constant output power selectability, which is mainly characterized in that a signal buffer circuit and a signal amplifying circuit comprise an operational amplifier OP 07, a programmable amplifier AD 603, an operational amplifier OP 07 and peripheral elements R3-R5 of the operational amplifier OP 07. After audio signals are constantly amplified through programme control, a loudspeaker can output sound signals with stable volume.
Description
Technical field
The utility model relates to a kind of audio power amplifier circuit, is the alternative constant audio power amplifier circuit of a kind of power output specifically.
Technical background
As everyone knows, the current audio frequency power amplifier machine of selling on the market can only directly amplify the miaow head output signal, sound phenomenon fluctuated can appear in such power amplifier in actual use, gives the auditory effect of audience's extreme difference, can interrupt the personnel's of propagandaing directed to communicate thinking of talking when serious.The utility model is improved its performance on the basis of existing audio frequency power amplifier, promptly when the setting volume is certain threshold value, the influence that power amplifier is not changed by the miaow head output signal can make its output audio power invariability in certain threshold range, and threshold value can be provided with as required.
Summary of the invention
Have above-mentioned deficiency for overcoming existing audio frequency power amplifier, the utility model provides a kind of power output alternative constant audio power amplifier circuit.
The technical solution of the utility model is: the audio power amplifier circuit that a kind of power output is alternative constant, it is characterized in that it is made of audio signal generating circuit, signal damping circuit, signal amplification circuit, power invariability amplifying circuit, described audio signal generating circuit is made of miaow head MKF, pull-up resistor R1, noise reduction capacitor C1, pull down resistor R2; The signal damping circuit mainly will be made of operational amplifier OP07 and peripheral cell thereof; Signal amplification circuit mainly is made of programmable amplifier AD603, operational amplifier OP07 and peripheral cell R3～R5 thereof; The power invariability amplifying circuit is made of operational amplifier OP07, gain amplifier LM324 and peripheral cell VT1, VT2, R6, R7, potentiometer R8, loud speaker H, VT1, VT2 emitter are connected with 6 pin of OP07, VT1, VT2 base stage short circuit and by R8 and H is anodal links to each other, the H minus earth, the VT1 collector electrode connects positive source, VT2 grounded collector, 3 pin of LM324 are connected with R8 by R7, by R6 ground connection, and 1 pin of LM324 and 2 pin short circuits, 4 pin connect positive source, 11 pin ground connection.
The beneficial effects of the utility model are: adopt signal amplification circuit mainly by programmable amplifier AD603, intelligently the audio input signal that changes is proofreaied and correct and amplified, the signal of transformationization is the constant amplifying signal of threshold value, finally obtains the constant audio signal of power output.
Description of drawings
Below in conjunction with description of drawings and embodiment further to the utility model explanation
Fig. 1 audio signal processing circuit figure
---operational amplifier, AD603---programmable amplifier, LM324---gain amplifier, VT1/---compound transistor wherein: OP07.
Fig. 2 signal processing software flow chart
Embodiment
In first embodiment shown in Figure 1, the audio power amplifier circuit that a kind of power output is alternative constant, it is characterized in that it is made of audio signal generating circuit, signal damping circuit, signal amplification circuit, power invariability amplifying circuit, wherein audio signal generating circuit is made of miaow head MKF, pull-up resistor R1, noise reduction capacitor C1, pull down resistor R2; Miaow head signal demand after noise reduction process adopts operational amplifier OP07 that signal is carried out voltage follow, so that output impedance diminishes, plays impedance matching; Signal amplification circuit is made of programmable amplifier AD603, operational amplifier OP07 and peripheral cell R3 ~ R5 thereof, signal amplifies through two-stage, be that prime is amplified employing programmable amplifier AD603, it can control multiplication factor by external input voltage, native system adopts the Single-chip Controlling voltage amplification factor, corresponding analog signal is exported in the signal that single-chip microcomputer send according to power amplification circuit and the input of keyboard, the multiplication factor of control signal amplifying circuit, the volume that makes loudspeaker send is default steady state value; The power invariability amplifying circuit puts part by computing and gain method partly constitutes, wherein operational amplifier is made of OP07, compound transistor VT1, VT2, gain amplifier is made of LM324 and peripheral cell R6, R7, potentiometer R8, and potentiometer R8 is used to select the power output threshold value.
MKF signal after the processing is converted into loud voice signal through loud speaker H.
In another embodiment shown in Figure 2, the utility model adopts the Single-chip Controlling voltage amplification factor, and flow process is the software programming flow process among the figure, and signal amplifies the final constant audio signal of power output in back through Single-chip Controlling, has improved the sense of hearing effectively.
Claims (1)
1, the alternative constant audio power amplifier circuit of a kind of power output, it is characterized in that it is made of audio signal generating circuit, signal damping circuit, signal amplification circuit, power invariability amplifying circuit, described audio signal generating circuit is enough become by miaow head MKF, resistance R 1, R2, capacitor C1; Signal damping circuit and signal amplification circuit mainly will be made of operational amplifier OP07, programmable amplifier AD603, operational amplifier OP07 and peripheral cell R3～R5 thereof; The power invariability amplifying circuit is by front stage circuits OP07 and compound transistor VT1, VT2, enough become with back stage gain discharge road LM324 and peripheral cell thereof, R6, R7, potentiometer R8, loud speaker H, VT1, VT2 emitter are connected with 6 pin of OP07, VT1, VT2 base stage short circuit and by R8 and H is anodal links to each other, the H minus earth, the VT1 collector electrode connects positive source, VT2 grounded collector, 3 pin of LM324 are connected with R8 by R7, by R6 ground connection, 1 pin of LM324 and 2 pin short circuits, 4 pin connect positive source, 11 pin ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202304938U CN201369813Y (en) | 2008-12-19 | 2008-12-19 | Audio power amplification circuit with constant output power selectability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202304938U CN201369813Y (en) | 2008-12-19 | 2008-12-19 | Audio power amplification circuit with constant output power selectability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201369813Y true CN201369813Y (en) | 2009-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202304938U Expired - Fee Related CN201369813Y (en) | 2008-12-19 | 2008-12-19 | Audio power amplification circuit with constant output power selectability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201369813Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522914A (en) * | 2011-12-07 | 2012-06-27 | 蒋文波 | Silicon controlled rectifier commutation dipulse power supply of high frequency switching power supply modulation |
| CN106301256A (en) * | 2016-08-29 | 2017-01-04 | 江门市川琪科技有限公司 | A kind of audio power amplifier circuit of power invariability |
-
2008
- 2008-12-19 CN CNU2008202304938U patent/CN201369813Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522914A (en) * | 2011-12-07 | 2012-06-27 | 蒋文波 | Silicon controlled rectifier commutation dipulse power supply of high frequency switching power supply modulation |
| CN106301256A (en) * | 2016-08-29 | 2017-01-04 | 江门市川琪科技有限公司 | A kind of audio power amplifier circuit of power invariability |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Qin Yangyang Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice |
Addressee: Chen Zhe Document name: Notification of Termination of Patent Right |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091223 Termination date: 20101219 |