CN114205717A - Earphone amplifier circuit - Google Patents
Earphone amplifier circuit Download PDFInfo
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- CN114205717A CN114205717A CN202111399012.2A CN202111399012A CN114205717A CN 114205717 A CN114205717 A CN 114205717A CN 202111399012 A CN202111399012 A CN 202111399012A CN 114205717 A CN114205717 A CN 114205717A
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- 230000005236 sound signal Effects 0.000 claims abstract description 128
- 230000003321 amplification Effects 0.000 claims abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 44
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/033—Headphones for stereophonic communication
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Acoustics & Sound (AREA)
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- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
- Stereophonic Arrangements (AREA)
Abstract
The invention provides an earphone amplifier circuit, which relates to the technical field of audio processing and comprises a signal mixing circuit, a working mode selection circuit, an earphone driving circuit and a power supply control circuit, wherein the power supply control circuit is connected with the signal mixing circuit, the working mode selection circuit and the earphone driving circuit and is used for providing a working power supply; the signal mixing circuit is connected with the working mode selection circuit and is used for transmitting the mixed stereo audio signals to the working mode selection circuit to output audio signals in different working modes; the working mode selection circuit is connected with the earphone drive circuit and is used for providing audio signals of different working modes to be input to the earphone drive circuit for amplification; the earphone driving circuit is connected with the earphone and used for driving the earphone to work so that the earphone plays audio, the mixing function of audio signals is achieved, the selection of mixed mode output audio or multi-channel mode output audio is achieved, and low distortion is kept while full-power output is achieved.
Description
Technical Field
The invention relates to the technical field of audio processing, in particular to an earphone amplifier circuit.
Background
The existing multi-channel headphone amplifier mostly has no mixing function, but a special sound console with the mixing function is complex to use and inconvenient to carry, and the existing headphone has poor driving capability, is easy to have serious distortion when outputting high power, cannot provide strong linear driving current for the headphone, cannot output audio signals with full power, and makes the audio listening feeling of the output of the headphone poor.
Disclosure of Invention
To overcome the deficiencies of the prior art, the present invention provides an earphone amplifier circuit.
The technical scheme adopted by the invention for solving the technical problems is as follows: in an earphone amplifier circuit, the improvement comprising: the earphone comprises a signal mixing circuit, a working mode selection circuit, an earphone driving circuit and a power supply control circuit, wherein the power supply control circuit is connected with the signal mixing circuit, the working mode selection circuit and the earphone driving circuit and is used for providing a working power supply; the signal mixing circuit is connected with the working mode selection circuit and is used for transmitting the mixed stereo audio signals to the working mode selection circuit to output audio signals in different working modes; the working mode selection circuit is connected with the earphone drive circuit and is used for providing audio signals of different working modes to be input to the earphone drive circuit for amplification; the earphone driving circuit is connected with the earphone and used for driving the earphone to work so that the earphone plays audio.
In the circuit, the working mode selection circuit comprises a signal input module, a signal selection module, a signal control module, a signal multi-channel output module and a signal mixing output module, wherein the signal control module comprises a double-D trigger U6,
the signal input module is connected with the signal selection module and used for inputting audio signals to the signal selection module;
the double-D trigger U6 is connected with the signal selection module and is used for controlling the connection of the switching signal selection module with the signal multi-channel output module and the signal mixing output module;
the signal selection module is respectively connected with the signal multi-channel output module and the signal mixing output module and is used for selecting the signal multi-channel output module or the signal mixing output module to output audio signals.
In the above circuit, the signal selection module includes an integrated analog switch U4, the integrated analog switch U4 includes a switch U4A, a switch U4B and a control terminal U4D, the switch U4A includes an output port AX, an output port AY and a switch port a, the switch U4B includes an output port BX, an output port BY and a switch port B, and the control terminal U4D includes a control port SA, a control port SB and a control port SC;
the control port SA and the control port SB are both connected with the double D trigger U6 and are used for receiving control switching signals;
the output port AX is connected with the signal input module and used for receiving a right channel signal of an audio signal; the output port BX is connected with the signal input module and used for receiving a left channel signal of the audio signal;
the output port AY is connected with the signal mixing output module, and the signal mixing output module is connected with the signal input module and used for receiving a right channel signal of the audio signal; the output port BY is connected with the signal mixing output module and is used for receiving a left channel signal of the audio signal;
the switching port A is connected with the signal multi-channel output module and is used for outputting a right channel signal of the audio signal; the switching port B is connected with the signal multi-channel output module and is used for outputting a left channel signal of the audio signal;
the switching port A is connected with the output port AX or the output port AY and is used for switching the output module of the right channel signal;
and the switching port B is connected with the output port BX or the output port BY and is used for switching the output module of the left channel signal.
In the circuit, the signal mixing output module includes a dual-path operational amplifier U3, the dual-path operational amplifier U3 is connected to the signal input module, and the dual-path operational amplifier U3 is connected to the output port AY, and is configured to receive a right channel signal of the audio signal and mix and output the right channel signal; the two-way operational amplifier U3 is connected to the output port BY, and is configured to receive a left channel signal of the audio signal and mix and output the left channel signal.
In the circuit, the signal input module comprises an audio input terminal CZ1, an ESD diode D1, an ESD diode D2, a resistor R4, a resistor R5, a capacitor C2 and a capacitor C5, a right channel input port of the audio input terminal CZ1 is connected with the output port AX, a capacitor C2 is arranged between the right channel input port of the audio input terminal CZ1 and the output port AX, and a first connection point is arranged between the right channel input port of the audio input terminal CZ1 and the capacitor C2;
a left channel input port of the audio input terminal CZ1 is connected with the output port BX, a capacitor C5 is arranged between the left channel input port of the audio input terminal CZ1 and the output port BX, and a second connection point is arranged between the left channel input port of the audio input terminal CZ1 and the capacitor C5;
the first connection point is connected with an ESD diode D1, the other end of an ESD diode D1 is connected with an ESD diode D2, and the other end of an ESD diode D2 is connected with the second connection point; the first connection point is connected to the resistor R4, the other end of the resistor R4 is connected to the resistor R5, and the other end of the resistor R5 is connected to the second connection point.
In the above circuit, the signal multi-channel output module includes a two-way operational amplifier U1 and an audio multi-channel output terminal CZ3, the two-way operational amplifier U1 includes an amplifier U1A and an amplifier U1B,
the positive input end of the amplifier U1B is connected with the switching port A, and the output end of the amplifier U1B is connected with the right output port of the audio multichannel output terminal CZ3, so as to output the right channel signal of the audio signal;
the positive input of the amplifier U1A is connected to the switching port B, and the output of the amplifier U1A is connected to the left output port of the audio multichannel output terminal CZ3 for outputting a left channel signal of the audio signal.
In the circuit, the earphone driving circuit comprises an audio signal input module, a volume adjusting module, a signal amplifying module and a signal output module, wherein the signal amplifying module comprises a two-way operational amplifier U5,
the volume adjusting module is connected with the audio signal input module and used for receiving the audio signal input by the audio signal input module and adjusting the volume of the audio signal;
the two-way operational amplifier U5 is connected with the volume adjusting module and is used for amplifying the audio signal with the volume adjusted;
the signal output module is connected with the two-way operational amplifier U5, and the signal output module is also connected with the earphone and used for outputting the audio signal amplified by the two-way operational amplifier U5 to the earphone and driving the earphone.
In the above circuit, the two-way operational amplifier U5 includes an amplifier U5A and an amplifier U5B, the amplifier U5A includes a positive input port U5A, a negative input port U5A, an output port U5A and a ground port U5A, the amplifier U5B includes a positive input port U5B, a negative input port U5B, an output port U5B and a power port U5B,
the positive input port U5A is connected to the volume adjustment module for receiving a left channel signal of the audio signals, and the positive input port U5B is connected to the volume adjustment module for receiving a right channel signal of the audio signals;
the negative input port U5A and the negative input port U5B are both connected with reference voltage;
the output port U5A is connected with the signal output module and is used for outputting a left channel signal in the amplified audio signals, and the output port U5B is connected with the signal output module and is used for outputting a right channel signal in the amplified audio signals;
the ground port U5A is grounded, and the power port U5B is connected with working voltage for providing working voltage for the two-way operational amplifier U5.
In the circuit, the volume adjusting module comprises a volume potentiometer VR1,
the volume potentiometer VR1 is connected with the audio signal input module and is used for receiving a left channel signal and a right channel signal in the audio signal input by the audio signal input module and adjusting the volume of the left channel signal and the right channel signal;
the volume potentiometer VR1 is connected to the positive input port U5A, and is configured to output the volume-adjusted left channel signal to the positive input port U5A; the volume potentiometer VR1 is further connected to the positive input port U5B, and is configured to output the right channel signal with the adjusted volume to the positive input port U5B.
In the above circuit, the audio signal input module includes an integrated analog switch U1, the integrated analog switch U1 includes a switch U1A, a switch U1B and a control terminal U1D,
the switch U1A includes an input port AX, an input port AY and a switch port a, the input port AX is connected to the right output port of the audio multichannel output terminal CZ3 and receives the right channel audio signal in the multichannel mode, the input port AY is connected to the dual-path operational amplifier U3 and receives the right channel audio signal in the mixed mode, the switch port a is connected to the input port AX or the input port AY in a switching manner, and the switch port a is connected to the volume potentiometer VR1 and is used for switching and inputting the right channel signal among different audio signals and outputting the right channel signal to the volume potentiometer VR 1;
the change-over switch U1B comprises an input port BX, an input port BY and a switch port B, wherein the input port BX is connected with a left output port of the audio multichannel output terminal CZ3 and receives a left channel audio signal in a multichannel mode, the input port BY is connected with the two-way operational amplifier U3, the switch port B is in switch connection with the input port BX or the input port BY, and the switch port B is connected with the volume potentiometer VR1 and is used for switching and inputting a left channel signal in different audio signals and outputting the left channel signal to the volume potentiometer VR 1;
the control end U1D is used to control the switching between the switching port a and the switching port B;
the signal output module comprises a coupling circuit which comprises a polar capacitor C20 and a polar capacitor C6,
the anode of the polar capacitor C20 is connected with the output port U5B, and the cathode of the polar capacitor C20 outputs a right channel signal to the earphone;
the anode of the polar capacitor C6 is connected with the output port U5A, and the cathode of the polar capacitor C6 outputs a right channel signal to the earphone.
The invention has the beneficial effects that: the audio signal can be amplified by the two-way operational amplifier U5 and then output to the earphone, the audio signal can drive the low-resistance earphone, the low distortion is kept while the full power output is realized, the structure is simple, the material is easy to obtain, and the cost is low; meanwhile, the input audio signal can be selected, and the adopted main operational amplifier has strong replaceability and can be used as various replaceable products.
Drawings
Fig. 1 is a block diagram of a headphone amplifier circuit according to the present invention.
Fig. 2 is a circuit diagram showing a specific configuration of the operation mode selection circuit in fig. 1.
Fig. 3 is a circuit diagram showing a specific structure of the earphone driving circuit in fig. 1.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
Referring to fig. 1, the present invention discloses an earphone amplifier circuit, which includes a signal mixing circuit 1000, a working mode selection circuit 2000, an earphone driving circuit 3000 and a power control circuit 4000, wherein the power control circuit 4000 is connected to the signal mixing circuit 1000, the working mode selection circuit 2000 and the earphone driving circuit 3000 to provide a working power; the signal mixing circuit 1000 is connected to the operation mode selection circuit 2000, and transmits the mixed stereo audio signal to the operation mode selection circuit 2000 to output audio signals of different operation modes; the working mode selection circuit 2000 is connected with the earphone driving circuit 3000, and provides audio signals of different working modes to be input to the earphone driving circuit 3000 for amplification; the earphone driving circuit 3000 is connected to an earphone for driving the earphone to work, so that the earphone plays audio, a mixing function of audio signals is realized, the selection of mixed-mode output audio or multi-channel mode output audio can be realized through the working mode selection circuit 2000, the audio signals can be amplified, the amplified audio signals can drive a low-resistance earphone, low distortion can be kept when full-power output is realized, the structure is simple, materials are easy to obtain, and the cost is low.
Referring to fig. 2, the operating mode selecting circuit 2000 includes a signal input module 10, a signal selecting module 20, a signal control module 30, a signal multi-channel output module 40, and a signal mixing output module 50, where the signal control module 30 includes a dual D flip-flop U6 with a model of CD4013, the signal selecting module 20 includes an integrated analog switch U4 with a model of CD4053BE, the integrated analog switch U4 includes a switch U4A, a switch U4B, and a control terminal U4D, the switch U4A includes an output port AX, an output port AY, and a switch port a, the switch U4B includes an output port BX, an output port BY, and a switch port B, and the control terminal U4D includes a control port SA, a control port SB, and a control port SC;
the control port SA and the control port SB are both connected with the double D trigger U6 and are used for receiving control switching signals; the output port AX is connected to the signal input module 10, and is configured to receive a right channel signal of an audio signal; the output port BX is connected to the signal input module 10, and is configured to receive a left channel signal of the audio signal; the output port AY is connected with the signal mixing output module 50, and the signal mixing output module 50 is connected with the signal input module 10 and is used for receiving a right channel signal of an audio signal; the output port BY is connected to the signal mixing output module 50, and is configured to receive a left channel signal of the audio signal; the switching port A is connected with the signal multi-channel output module 40 and is used for outputting a right channel signal of the audio signal; the switching port B is connected with the signal multi-channel output module 40 and is used for outputting a left channel signal of the audio signal; the switching port A is connected with the output port AX or the output port AY and is used for switching the output module of the right channel signal; and the switching port B is connected with the output port BX or the output port BY and is used for switching the output module of the left channel signal.
The signal mixing output module 50 comprises a two-way operational amplifier U3 with the model number of NJM4580CG, the two-way operational amplifier U3 is connected with the signal input module 10, and the two-way operational amplifier U3 is connected with the output port AY and is used for receiving a right channel signal of an audio signal and mixing and outputting the right channel signal; the two-way operational amplifier U3 is connected to the output port BY, and is configured to receive a left channel signal of the audio signal and mix and output the left channel signal.
Referring to fig. 2, the dual D flip-flop U6 includes an eleventh pin, a twelfth pin, and a thirteenth pin, where the thirteenth pin is connected to both the control port SA and the control port SB for outputting a switching signal, the eleventh pin is connected to the control switch SW1 for controlling the switching signal output by the thirteenth pin, and a default state of the circuit is that the thirteenth pin outputs a low level signal, and the twelfth pin is a high level. When the thirteenth pin outputs a low level to the control port SA and the control port SB, the multi-channel mode is performed at this time, when the control switch SW1 is pressed, a high level is given to the eleventh pin, the twelfth pin is a low level, the thirteenth pin outputs a high level to the control port SA and the control port SB, the multi-channel mode is a hybrid mode at this time, and switching of the working modes is achieved; the twelfth pin is connected with an LED lamp LED2, the other end of the LED lamp LED2 is grounded, the thirteenth pin is connected with an LED lamp LED1, the other end of the LED lamp LED1 is grounded, and in a multi-channel mode, the twelfth pin outputs a high level and the LED2 is bright; in the mixed mode, the thirteenth pin outputs high level, the LED1 is lightened, and the indication of the working mode of the circuit is realized.
The working mode selection circuit has strong expandability, audio signal input channels can be easily expanded only by correspondingly increasing the number of the signal input modules 10, and the selection of the output modes of multi-channel audio input signals is realized, wherein the first mode is a multi-channel mode, namely a stereo signal input I is only transmitted to a stereo signal output I, a stereo signal input II is only transmitted to a stereo signal output II, channels are independent from each other and do not interfere with each other, and left and right channels are independent from each other; one is a mixed mode, i.e. mixing multiple input signals into one stereo signal, and then transmitting to one output signal, but the left and right channels are independent from each other.
Referring to fig. 2, in this embodiment, a first path of signal input module 10 is taken as an example to illustrate a specific structure and an implementation principle of the circuit, and the other path of signal input module is similar to the first path of signal input module, where the signal input module 10 of the present invention includes an audio input terminal CZ1, an ESD diode D1, an ESD diode D2, a resistor R4, a resistor R5, a capacitor C2, and a capacitor C5, a right channel input port of the audio input terminal CZ1 is connected to the output port AX, a capacitor C2 is disposed between the right channel input port of the audio input terminal CZ1 and the output port AX, and a first connection point 60 is disposed between the right channel input port of the audio input terminal CZ1 and the capacitor C2; a left channel input port of the audio input terminal CZ1 is connected with the output port BX, a capacitor C5 is arranged between the left channel input port of the audio input terminal CZ1 and the output port BX, and a second connection point 70 is arranged between the left channel input port of the audio input terminal CZ1 and the capacitor C5; the first connection point 60 is connected to the ESD diode D1, the other end of the ESD diode D1 is connected to the ESD diode D2, and the other end of the ESD diode D2 is connected to the second connection point 70; the first connection point 60 is connected with a resistor R4, the other end of the resistor R4 is connected with a resistor R5, the other end of the resistor R5 is connected with a second connection point 70, a stereo input signal enters the circuit through CZ1 and is coupled to a next-stage circuit through a capacitor C2 and a capacitor C5, the ESD diode D1 and the ESD diode D2 are used for resisting static electricity and preventing the damage of the circuit device of the stage caused by the static electricity, and the resistor R4 and the resistor R5 fix the direct-current voltage of the input end to be the ground voltage and prevent the floating potential from causing signal impact.
The signal multi-channel output module 40 comprises a two-way operational amplifier U1, a resistor R35, a resistor R36, an ESD diode D6, an ESD diode D7 and an audio multi-channel output terminal CZ3, the model of the two-way operational amplifier U1 is NJM4580CG, the two-way operational amplifier U1 comprises an amplifier U1A and an amplifier U1B,
the positive input end of the amplifier U1B is connected with the switching port A, and the output end of the amplifier U1B is connected with the right output port of the audio multichannel output terminal CZ3, so as to output the right channel signal of the audio signal; the positive input end of the amplifier U1A is connected with the switching port B, and the output end of the amplifier U1A is connected with the left output port of the audio multichannel output terminal CZ3, and is used for outputting a left channel signal of the audio signal; a third connection point 80 is arranged between the output end of the amplifier U1B and the right output port of the audio multichannel output terminal CZ3, the third connection point 80 is connected with a resistor R35, the other end of the resistor R35 is grounded, the third connection point 80 is connected with an ESD diode D6, and the other end of the ESD diode D6 is grounded; the output end of the amplifier U1A and the left output port of the audio multichannel output terminal CZ3 are provided with a fourth connection point 90, the fourth connection point 90 is connected with a resistor R36, the other end of the resistor R36 is grounded, the fourth connection point 90 is connected with an ESD diode D7, the other end of the ESD diode D7 is grounded, the output end direct-current voltage is fixed to be ground voltage through the resistor R35 and the resistor R36, signal impact caused by floating potential can be prevented, the ESD diode D6 and the ESD diode D7 are used for resisting static electricity, and damage of a circuit device of the stage caused by the static electricity is prevented.
In this embodiment, each channel signal is divided into two channels, one channel is mixed BY the signal mixing output module 50 and then coupled to the output port AY and the output port BY of the signal selection module 20 for selection; the other path is directly coupled to the output port AX and the output port BX of the signal selection module 20, when the control port SA, the control port SB and the control port SC all receive the low level signal of the thirteenth pin of the dual D flip-flop U6, i.e. in the multi-channel mode, the switch port a and the output port AX, the switch port B and the output port BX, and the switch port C and the output port CX are respectively turned on, the right channel signal input from the right channel input port of the audio input terminal CZ1 is output through the right output port of the audio multi-channel output terminal CZ3, the left channel signal input from the left channel input port of the audio input terminal CZ1 is output through the left output port of the audio multi-channel output terminal CZ3, and similarly, the right channel signal input from the right channel input port of the audio input terminal CZ2 is output through the right output port of the audio multi-channel output terminal CZ4, a left channel signal input by a left channel input port of the audio input terminal CZ2 is output through a left output port of the audio multi-channel output terminal CZ4, channels are independent of each other and do not interfere with each other, and left and right channels are independent of each other; when the hybrid mode is required to be switched, the control switch SW1 is pressed, the control port SA, the control port SB and the control port SC all receive a high level signal from the thirteenth pin of the dual D flip-flop U6, that is, in the mixed mode, the switch port a and the output port AY, the switch port B and the output port BY, and the switch port C and the output port CY are respectively conducted, after the right channel signal inputted from the right channel input port of the audio input terminal CZ1 and the right channel signal inputted from the right channel input port of the audio input terminal CZ2 are mixed BY the dual-channel operational amplifier U3, the right channel signal RM is output, the left channel signal input from the left channel input port of the audio input terminal CZ1 and the left channel signal input from the left channel input port of the audio input terminal CZ2 are mixed by the dual-channel operational amplifier U3, outputting a left channel signal LM, wherein a right channel signal RM and the left channel signal LM are independent; and switching the audio signal output mode is realized. The selection control of two working modes is realized through a very simple circuit architecture, the mode selection is controlled by the double-D trigger, the reliability is excellent, the anti-interference capability is strong, the touch control is realized, and the service life is long; meanwhile, the main operational amplifier has strong replaceability and can replace various products; and the signal mixing adopts a single power supply mechanism, so that the structure is simpler.
Referring to fig. 3, the earphone driving circuit 3000 includes an audio signal input module 200, a volume adjustment module 201, a signal amplification module 202, and a signal output module 203, where the signal amplification module 202 includes a two-way operational amplifier U5, a gain circuit, and a filter circuit, and the volume adjustment module 201 is connected to the audio signal input module 200, and is configured to receive an audio signal input by the audio signal input module 200 and adjust the volume of the audio signal; the two-way operational amplifier U5 is connected with the volume adjusting module 201 and amplifies the audio signal with the adjusted volume; the signal output module 203 is connected with the two-way operational amplifier U5, the signal output module 203 is also connected with the earphone, the audio signal amplified by the two-way operational amplifier U5 is output to the earphone through the signal output module 203, the audio signal can drive the common low-resistance earphone, and the low distortion is kept while the audio is output at full power. Further, a gain circuit is connected to the dual-path operational amplifier U5 to adjust the gain of the dual-path operational amplifier U5, in this embodiment, as shown in fig. 1, the gain circuit includes a resistor R1, a resistor R2, a resistor R7, and a resistor R8, a ratio of the resistor R2 to the resistor R1, and a ratio of the resistor R8 to the resistor R7 determine the gain of the dual-path operational amplifier U5, where R2 equals to R8 equals to 10K, and R1 equals to R7 equals to 3.32K, so that the gain of the dual-path operational amplifier U5 is (10/3.32) +1 equals to 4 equals to 12 dB; furthermore, the filter circuit is connected with the dual-path operational amplifier U5 to filter the dual-path operational amplifier U5, in this embodiment, the filter circuit includes a capacitor C1 and a capacitor C7, which limits the upper limit of the bandwidth of the dual-path operational amplifier U5 and filters out non-audio signals above 20 kHz.
The two-way operational amplifier U5 comprises an amplifier U5A and an amplifier U5B, the amplifier U5A comprises a positive input port U5A, a negative input port U5A, an output port U5A and a ground port U5A, and the amplifier U5B comprises a positive input port U5B, a negative input port U5B, an output port U5B and a power port U5B; the volume adjustment module 201 comprises a volume potentiometer VR 1; the signal output module 203 comprises a coupling circuit 204, the coupling circuit 204 comprises a polar capacitor C20 and a polar capacitor C6,
the negative input port U5A and the negative input port U5B are both connected with reference voltage; the grounding port U5A is grounded, and the power supply port U5B is connected with working voltage to provide working voltage for the two-way operational amplifier U5;
the volume potentiometer VR1 is connected to the audio signal input module 200, and receives a left channel signal and a right channel signal in the audio signal input by the audio signal input module 200, and adjusts the volume of the left channel signal and the right channel signal;
the volume potentiometer VR1 is connected to the positive input port U5A, and is configured to output the left channel signal with the adjusted volume to the positive input port U5A, the volume potentiometer VR1 is further connected to the positive input port U5B, and is configured to output the right channel signal with the adjusted volume to the positive input port U5B, and the two-way operational amplifier U5 amplifies the received left channel signal and the right channel signal;
the positive pole of the polar capacitor C20 is connected with the output port U5B, the negative pole of the polar capacitor C20 outputs a right channel signal to the earphone, the positive pole of the polar capacitor C6 is connected with the output port U5A, the negative pole of the polar capacitor C6 outputs a right channel signal to the earphone, and the amplified right channel signal and the amplified left channel signal are coupled to the earphone through the polar capacitor C20 and the polar capacitor C6 and drive the earphone to work.
Further, the audio signal input module 200 includes an integrated analog switch U1, the integrated analog switch U1 includes a switch U1A, a switch U1B and a control terminal U1D,
the switch U1A includes an input port AX, an input port AY, and a switch port a, where the input port AX and the input port AY respectively receive right channel signals in different audio signals, the switch port a is connected to the input port AX or the input port AY in a switching manner, and the switch port a is connected to the volume potentiometer VR1, and is configured to switch and input right channel signals in different audio signals and output the right channel signals to the volume potentiometer VR 1;
the change-over switch U1B comprises an input port BX, an input port BY and a switch port B, wherein the input port BX and the input port BY respectively receive left channel signals in different audio signals, the switch port B is in switch connection with the input port BX or the input port BY, and the switch port B is connected with the volume potentiometer VR1 and is used for switching and inputting the left channel signals in the different audio signals and outputting the signals to the volume potentiometer VR 1;
in this embodiment, the input port AX is connected to the right output port of the audio multichannel output terminal CZ3, the input port is a right channel signal in a multichannel mode, the input port BX is connected to the left output port of the audio multichannel output terminal CZ3, the input port is a left channel signal in the multichannel mode, the control switch port a is connected to the input port AX, and the control switch port B is connected to the input port BX, so that the input of an audio signal in the multichannel mode can be realized; the input port AY inputs a mixed-mode right channel signal RM, the input port BY inputs a mixed-mode left channel signal LM, the control switch port A is connected with the input port AY, and the control switch port B is connected with the input port BY, so that the input of audio signals in a mixed mode can be realized.
The switching of audio signal input is realized through the integrated analog switch U1, the audio signal input under a multi-channel mode can be selected, the audio signal input under a mixed mode can also be selected, and the audio signal is output to the earphone through the polar capacitor C20 and the polar capacitor C6 after being filtered, gained and amplified by the signal amplification module, and the earphone is driven to work, and the volume is adjusted through the volume potentiometer. The earphone driving circuit amplifies the audio signal by the two-way operational amplifier U5 and outputs the amplified audio signal to the earphone, the audio signal can drive the low-resistance earphone, the full-power output is realized, and simultaneously, the low distortion is kept, the structure is simple, the material taking is easy, and the cost is low; meanwhile, the input audio signal can be selected, and the adopted main operational amplifier has strong replaceability and can be used as various replaceable products.
The earphone amplifier circuit provided by the invention realizes the mixing function of audio signals, can also realize the selection of mixed mode output audio or multi-channel mode output audio through the control switch, amplifies the audio signals through the two-way operational amplifier U5 and then outputs the amplified audio signals to the earphone, and the audio signals can drive a low-resistance earphone, so that the low distortion is kept while the full-power output is realized, the structure is simple, the materials are easy to obtain, and the cost is low; meanwhile, the input audio signal can be selected, and the adopted main operational amplifier has strong replaceability and can be used as various replaceable products.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An earphone amplifier circuit, characterized by: comprises a signal mixing circuit, a working mode selection circuit, an earphone driving circuit and a power supply control circuit,
the power supply control circuit is connected with the signal mixing circuit, the working mode selection circuit and the earphone drive circuit and is used for providing a working power supply;
the signal mixing circuit is connected with the working mode selection circuit and is used for transmitting the mixed stereo audio signals to the working mode selection circuit to output audio signals in different working modes;
the working mode selection circuit is connected with the earphone drive circuit and is used for providing audio signals of different working modes to be input to the earphone drive circuit for amplification;
the earphone driving circuit is connected with the earphone and used for driving the earphone to work so that the earphone plays audio.
2. A headphone amplifier circuit as defined in claim 1, wherein: the working mode selection circuit comprises a signal input module, a signal selection module, a signal control module, a signal multi-channel output module and a signal mixing output module, wherein the signal control module comprises a double-D trigger U6,
the signal input module is connected with the signal selection module and used for inputting audio signals to the signal selection module;
the double-D trigger U6 is connected with the signal selection module and is used for controlling the connection of the switching signal selection module with the signal multi-channel output module and the signal mixing output module;
the signal selection module is respectively connected with the signal multi-channel output module and the signal mixing output module and is used for selecting the signal multi-channel output module or the signal mixing output module to output audio signals.
3. A headphone amplifier circuit as defined in claim 2, wherein: the signal selection module comprises an integrated analog switch U4, the integrated analog switch U4 comprises a change-over switch U4A, a change-over switch U4B and a control end U4D, the change-over switch U4A comprises an output port AX, an output port AY and a change-over port A, the change-over switch U4B comprises an output port BX, an output port BY and a change-over port B, and the control end U4D comprises a control port SA, a control port SB and a control port SC;
the control port SA and the control port SB are both connected with the double D trigger U6 and are used for receiving control switching signals;
the output port AX is connected with the signal input module and used for receiving a right channel signal of an audio signal; the output port BX is connected with the signal input module and used for receiving a left channel signal of the audio signal;
the output port AY is connected with the signal mixing output module, and the signal mixing output module is connected with the signal input module and used for receiving a right channel signal of the audio signal; the output port BY is connected with the signal mixing output module and is used for receiving a left channel signal of the audio signal;
the switching port A is connected with the signal multi-channel output module and is used for outputting a right channel signal of the audio signal; the switching port B is connected with the signal multi-channel output module and is used for outputting a left channel signal of the audio signal;
the switching port A is connected with the output port AX or the output port AY and is used for switching the output module of the right channel signal;
and the switching port B is connected with the output port BX or the output port BY and is used for switching the output module of the left channel signal.
4. A headphone amplifier circuit as defined in claim 3, wherein: the signal mixing output module comprises a two-way operational amplifier U3, the two-way operational amplifier U3 is connected with the signal input module, and the two-way operational amplifier U3 is connected with the output port AY and is used for receiving a right channel signal of an audio signal and mixing and outputting the right channel signal; the two-way operational amplifier U3 is connected to the output port BY, and is configured to receive a left channel signal of the audio signal and mix and output the left channel signal.
5. A headphone amplifier circuit as defined in claim 3, wherein: the signal input module comprises an audio input terminal CZ1, an ESD diode D1, an ESD diode D2, a resistor R4, a resistor R5, a capacitor C2 and a capacitor C5, a right channel input port of the audio input terminal CZ1 is connected with the output port AX, a capacitor C2 is arranged between the right channel input port of the audio input terminal CZ1 and the output port AX, and a first connecting point is arranged between the right channel input port of the audio input terminal CZ1 and the capacitor C2;
a left channel input port of the audio input terminal CZ1 is connected with the output port BX, a capacitor C5 is arranged between the left channel input port of the audio input terminal CZ1 and the output port BX, and a second connection point is arranged between the left channel input port of the audio input terminal CZ1 and the capacitor C5;
the first connection point is connected with an ESD diode D1, the other end of an ESD diode D1 is connected with an ESD diode D2, and the other end of an ESD diode D2 is connected with the second connection point; the first connection point is connected to the resistor R4, the other end of the resistor R4 is connected to the resistor R5, and the other end of the resistor R5 is connected to the second connection point.
6. A headphone amplifier circuit as defined in claim 3, wherein: the signal multichannel output module comprises a two-way operational amplifier U1 and an audio multichannel output terminal CZ3, the two-way operational amplifier U1 comprises an amplifier U1A and an amplifier U1B,
the positive input end of the amplifier U1B is connected with the switching port A, and the output end of the amplifier U1B is connected with the right output port of the audio multichannel output terminal CZ3, so as to output the right channel signal of the audio signal;
the positive input of the amplifier U1A is connected to the switching port B, and the output of the amplifier U1A is connected to the left output port of the audio multichannel output terminal CZ3 for outputting a left channel signal of the audio signal.
7. The headphone amplifier circuit as recited in claim 6, wherein: the earphone driving circuit comprises an audio signal input module, a volume adjusting module, a signal amplifying module and a signal output module, wherein the signal amplifying module comprises a two-way operational amplifier U5,
the volume adjusting module is connected with the audio signal input module and used for receiving the audio signal input by the audio signal input module and adjusting the volume of the audio signal;
the two-way operational amplifier U5 is connected with the volume adjusting module and is used for amplifying the audio signal with the volume adjusted;
the signal output module is connected with the two-way operational amplifier U5, and the signal output module is also connected with the earphone and used for outputting the audio signal amplified by the two-way operational amplifier U5 to the earphone and driving the earphone.
8. The headphone amplifier circuit as recited in claim 7, wherein: the two-way operational amplifier U5 includes an amplifier U5A and an amplifier U5B, the amplifier U5A includes a positive input port U5A, a negative input port U5A, an output port U5A and a ground port U5A, the amplifier U5B includes a positive input port U5B, a negative input port U5B, an output port U5B and a power port U5B,
the positive input port U5A is connected to the volume adjustment module for receiving a left channel signal of the audio signals, and the positive input port U5B is connected to the volume adjustment module for receiving a right channel signal of the audio signals;
the negative input port U5A and the negative input port U5B are both connected with reference voltage;
the output port U5A is connected with the signal output module and is used for outputting a left channel signal in the amplified audio signals, and the output port U5B is connected with the signal output module and is used for outputting a right channel signal in the amplified audio signals;
the ground port U5A is grounded, and the power port U5B is connected with working voltage for providing working voltage for the two-way operational amplifier U5.
9. The headphone amplifier circuit as recited in claim 8, wherein: the volume adjustment module includes a volume potentiometer VR1,
the volume potentiometer VR1 is connected with the audio signal input module and is used for receiving a left channel signal and a right channel signal in the audio signal input by the audio signal input module and adjusting the volume of the left channel signal and the right channel signal;
the volume potentiometer VR1 is connected to the positive input port U5A, and is configured to output the volume-adjusted left channel signal to the positive input port U5A; the volume potentiometer VR1 is further connected to the positive input port U5B, and is configured to output the right channel signal with the adjusted volume to the positive input port U5B.
10. The headphone amplifier circuit as recited in claim 8, wherein: the audio signal input module comprises an integrated analog switch U1, an integrated analog switch U1 comprises a change-over switch U1A, a change-over switch U1B and a control terminal U1D,
the switch U1A includes an input port AX, an input port AY and a switch port a, the input port AX is connected to the right output port of the audio multichannel output terminal CZ3 and receives the right channel audio signal in the multichannel mode, the input port AY is connected to the dual-path operational amplifier U3 and receives the right channel audio signal in the mixed mode, the switch port a is connected to the input port AX or the input port AY in a switching manner, and the switch port a is connected to the volume potentiometer VR1 and is used for switching and inputting the right channel signal among different audio signals and outputting the right channel signal to the volume potentiometer VR 1;
the change-over switch U1B comprises an input port BX, an input port BY and a switch port B, wherein the input port BX is connected with a left output port of the audio multichannel output terminal CZ3 and receives a left channel audio signal in a multichannel mode, the input port BY is connected with the two-way operational amplifier U3, the switch port B is in switch connection with the input port BX or the input port BY, and the switch port B is connected with the volume potentiometer VR1 and is used for switching and inputting a left channel signal in different audio signals and outputting the left channel signal to the volume potentiometer VR 1;
the control end U1D is used to control the switching between the switching port a and the switching port B;
the signal output module comprises a coupling circuit which comprises a polar capacitor C20 and a polar capacitor C6,
the anode of the polar capacitor C20 is connected with the output port U5B, and the cathode of the polar capacitor C20 outputs a right channel signal to the earphone;
the anode of the polar capacitor C6 is connected with the output port U5A, and the cathode of the polar capacitor C6 outputs a right channel signal to the earphone.
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| CN114205717B (en) | 2024-01-05 |
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