CN210007676U - audio amplifying circuit based on operational amplifier - Google Patents
audio amplifying circuit based on operational amplifier Download PDFInfo
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- CN210007676U CN210007676U CN201822155850.5U CN201822155850U CN210007676U CN 210007676 U CN210007676 U CN 210007676U CN 201822155850 U CN201822155850 U CN 201822155850U CN 210007676 U CN210007676 U CN 210007676U
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Abstract
The utility model provides an kind of audio amplification circuit based on operational amplifier is including enlargiing the chip, resistance is a plurality of, electric capacity is a plurality of, enlarge between chip output and the positive negative pole of power with resistance connection, amplifier circuit's input and electric capacity are connected the back and are connected with the homophase input of enlarging the chip, electric capacity is equipped with two nodes to enlarging the branch road of chip homophase input, ground connection behind the individual node connecting resistance, second node and electric capacity, ground connection behind the resistance series connection, it divide into two branch roads to enlarge the chip output, wherein are connected through resistance and enlarged chip inverting input and are constituteed the feedback loop, and electric capacity in addition, the output as amplifier circuit behind the resistance series connection, the components and parts quantity has been reduced, development cost is reduced, amplifier circuit's linearity and efficiency can be taken into account simultaneously.
Description
Technical Field
The utility model relates to an kind of audio amplifier circuit based on operational amplifier.
Background
When a low signal of a microphone or a microphone needs to be pre-amplified to drive a lower circuit in audio transmission, the pre-amplification circuit is required to have the characteristics of high amplification factor, low noise and the like, the traditional pre-amplification circuit can meet the requirements of amplification factor and low noise, however, the linearity and the efficiency of the pre-amplification circuit are mutually contradictory characteristics, at present, several main methods for improving the linearity of the pre-amplifier comprise a feed-forward technology, a feedback technology and an envelope elimination and restoration technology, and although the feed-forward technology can effectively improve the linearity of the power amplifier, the feed-forward technology can greatly reduce the efficiency of the amplifier. Although the envelope elimination technique and the restoration technique can improve the linearity of the preamplifier without affecting the efficiency of the amplifier, the structure adopted by the technique is very complicated, which is not beneficial to the design of the circuit and increases the manufacturing cost of the circuit.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides an kind of audio amplifier circuit based on operational amplifier.
The utility model discloses a following technical scheme can realize.
The utility model provides a kind of audio amplification circuit based on operational amplifier includes and amplifies chip PA02, resistance, electric capacity, connect connecting resistance R4, resistance R5 between amplifier chip PA02 output and the power positive negative pole respectively, amplifier circuit's input and electric capacity C1 are connected the back and are connected with amplifier chip PA 02's homophase input end, electric capacity C1 is equipped with two nodes to being equipped with on the branch road of amplifier chip PA02 homophase input end, ground connection behind node connecting resistance R1, second node and electric capacity C2, resistance R2, resistance R3, electric capacity C3 ground connection after establishing ties, amplifier chip PA02 output divide into two branches, wherein is connected through resistance R6 and amplifier chip PA02 inverting input end and constitutes the feedback loop, in addition 02 and electric capacity C02, as amplifier circuit's output after resistance R02 establishes ties, be equipped with 02 between resistance R02 and the resistance R02 inverting input end, this node is connected with the inverting loop and is put into amplifier chip PA02 with inverting input end.
The amplification chip PA02 is an integrated PA02 power amplifier.
The resistor R1 is 560 Ω, the resistor R2 is 1k Ω, the resistor R3 is 16k Ω, the resistors R4 and R5 are both 1 Ω, the resistor R6 is 100k Ω, and the resistor R7 is 1.2k Ω.
The parameters of the capacitor C1 are maximum voltage 25V and capacitor capacity 10 muF, the parameters of the capacitor C2 are maximum voltage 63V, capacitor capacity 0.001 muF, the parameters of the capacitor C3 are maximum voltage 25V, capacitor capacity 1 muF, the parameters of the capacitor C4 are maximum voltage 35V, and capacitor capacity is 1000 muF.
The power supply voltage in the amplifying chip PA02 is +/-12V.
The beneficial effects of the utility model reside in that: the utility model discloses an operational amplification integrated circuit chip PA02 constitutes audio frequency preamplifier circuit, has reduced components and parts quantity, has reduced development cost, can compromise amplifier circuit's linearity and efficiency simultaneously.
Drawings
Fig. 1 is a schematic diagram of an amplifying circuit according to the present invention.
Detailed Description
The following illustrates the present invention, but the scope of the invention is not limited thereto.
The utility model provides a kind of audio amplification circuit based on operational amplifier includes and amplifies chip PA02, resistance, electric capacity, connect connecting resistance R4, resistance R5 between amplifier chip PA02 output and the power positive negative pole respectively, amplifier circuit's input and electric capacity C1 are connected the back and are connected with amplifier chip PA 02's homophase input end, electric capacity C1 is equipped with two nodes to being equipped with on the branch road of amplifier chip PA02 homophase input end, ground connection behind node connecting resistance R1, second node and electric capacity C2, resistance R2, resistance R3, electric capacity C3 ground connection after establishing ties, amplifier chip PA02 output divide into two branches, wherein is connected through resistance R6 and amplifier chip PA02 inverting input end and constitutes the feedback loop, in addition 02 and electric capacity C02, as amplifier circuit's output after resistance R02 establishes ties, be equipped with 02 between resistance R02 and the resistance R02 inverting input end, this node is connected with the inverting loop and is put into amplifier chip PA02 with inverting input end.
The amplification chip PA02 is an integrated PA02 power amplifier.
The resistor R1 is 560 Ω, the resistor R2 is 1k Ω, the resistor R3 is 16k Ω, the resistors R4 and R5 are both 1 Ω, the resistor R6 is 100k Ω, and the resistor R7 is 1.2k Ω.
The parameters of the capacitor C1 are maximum voltage 25V and capacitor capacity 10 muF, the parameters of the capacitor C2 are maximum voltage 63V, capacitor capacity 0.001 muF, the parameters of the capacitor C3 are maximum voltage 25V, capacitor capacity 1 muF, the parameters of the capacitor C4 are maximum voltage 35V, and capacitor capacity is 1000 muF.
The power supply voltage in the amplifying chip PA02 is +/-12V.
The amplifier chip PA02 is produced by American APEX company, the working voltage is +/-7V- +/-19V, the maximum power of audio frequency is 30W, the working environment temperature is-25 ℃ to +85 ℃, the quality grade is B-1, and the adopted standard is DSCC/883.
The utility model discloses a theory of operation the utility model discloses an amplifier circuit, lower audio signal passes through filter capacitance C1 from amplifier circuit's input and gets into the circuit, filter resistance R1 filters DC signal and noise waveform again, the signal divide into two the tunnel, way gets into the amplifier from amplifier chip PA 02's noninverting input, from amplifier chip PA02 output after returning to amplifier chip PA 02's inverting input through resistance R6, way also divide into two the tunnel after carrying out step filtering plastic through electric capacity C2 and resistance R2 in addition, wherein way and above-mentioned amplifier chip PA02 output feed back the signal jointly as feedback signal and get into amplifier chip PA 02's inverting input after amplifying signal, way is through electric capacity C3 and resistance R3 ground connection in addition, signal after amplifying is from PA02 output transmission electric capacity C4 and resistance R7 after again from amplifier circuit output.
Claims (4)
- The audio amplifier circuit based on the operational amplifier is characterized by comprising an amplifying chip PA02, a resistor and a capacitor, wherein the output end of the amplifying chip PA02 is connected with the positive electrode and the negative electrode of a power supply through the resistor R4 and the resistor R5 respectively, the input end of the amplifying circuit is connected with the capacitor C1 and then connected with the non-inverting input end of the amplifying chip PA02, two nodes are arranged on a branch from the capacitor C1 to the non-inverting input end of the amplifying chip PA02, the node is connected with the resistor R1 and then grounded, the second node is connected with the capacitor C2, the resistor R2, the resistor R3 and the capacitor C3 in series and then grounded, the output end of the amplifying chip PA02 is divided into two branches, wherein of the nodes are connected with the inverting input end of the amplifying chip PA02 through the resistor R6 to form a feedback loop, the other 02 is connected with the capacitor C02 and the resistor R02 to serve as the output end of the amplifying circuit, and 02 is connected with the inverting input end of the amplifying chip PA 02.
- 2. The operational amplifier based audio amplifier circuit as set forth in claim 1, wherein the resistor R1 is 560 Ω, the resistor R2 is 1k Ω, the resistor R3 is 16k Ω, the resistors R4 and R5 are 1 Ω, the resistor R6 is 100k Ω, and the resistor R7 is 1.2k Ω.
- 3. The operational amplifier based audio amplifier circuit as set forth in claim 1, wherein the parameters of the capacitor C1 are maximum voltage 25V and capacitor capacity 10 μ F, the parameters of the capacitor C2 are maximum voltage 63V and capacitor capacity 0.001 μ F, the parameters of the capacitor C3 are maximum voltage 25V and capacitor capacity 1 μ F, the parameters of the capacitor C4 are maximum voltage 35V and capacitor capacity 1000 μ F.
- 4. The operational amplifier based audio amplifier circuit as set forth in claim 1, wherein the power supply voltage in the PA02 is + -12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822155850.5U CN210007676U (en) | 2018-12-21 | 2018-12-21 | audio amplifying circuit based on operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822155850.5U CN210007676U (en) | 2018-12-21 | 2018-12-21 | audio amplifying circuit based on operational amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210007676U true CN210007676U (en) | 2020-01-31 |
Family
ID=69298940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822155850.5U Active CN210007676U (en) | 2018-12-21 | 2018-12-21 | audio amplifying circuit based on operational amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210007676U (en) |
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2018
- 2018-12-21 CN CN201822155850.5U patent/CN210007676U/en active Active
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