Power amplifier capable of adjusting stereophonic sound in toggle mode

Abstract

The utility model discloses a power amplifier capable of adjusting stereophonic sound in a toggle mode, which comprises a power amplifier shell and a circuit control board, and a power supply toggle switch, an earphone interface, a volume adjusting knob and a stereophonic sound toggle switch are fixed at the front end of the power amplifier shell from left to right. A Bluetooth antenna, a PRE output interface, an audio input port, an audio output binding post and a power supply interface are sequentially fixed to a rear end plate of the power amplifier shell from left to right. The circuit control board comprises a Bluetooth circuit, a channel selection circuit, an RCA audio input circuit, a power module, a signal amplification circuit, a volume control circuit, a tone control module, an earphone output circuit and a PRE output circuit. According to the utility model, the Bluetooth circuit is arranged on the circuit control board, so that Bluetooth wireless connection between a mobile phone of a user and the power amplifier is realized, wired or wireless audio input is realized, and the practicability of the power amplifier is improved.

Description

Technical Field

[0001] This utility model relates to the field of power amplifier technology, specifically to a power amplifier with a toggle-type adjustable stereo sound. Background Technology

[0002] A power amplifier, commonly known as a "loudspeaker amplifier," amplifies the weak electrical signal from a signal source (or mixing console in a professional audio system) to drive speakers to produce sound.

[0003] Existing power amplifier structures mainly consist of a power amplifier housing, a power amplifier circuit board, and an audio input interface. The power amplifier circuit board is installed inside the power amplifier housing, while the audio input interface is fixed to the outside of the housing. To facilitate the adjustment of the power amplifier's operating parameters, existing manufacturers also include multiple knobs and switches on the power amplifier housing, such as volume control knobs, microphone control knobs, and push-button switches. Existing power amplifiers have the following shortcomings in use:

[0004] 1) The audio input of the power amplifier is wired. It is usually necessary to use an audio cable to plug into the audio input interface and use a wired method to connect the signal of the audio source to the power amplifier for amplification. It is relatively troublesome to use an audio cable for transmission.

[0005] 2) The amplifier's audio input can only be wired through the audio input interface, and the audio source input interface and audio source input mode are limited.

[0006] 3) The power amplifier's power switch is a push-button type. In actual use, if the user accidentally touches the switch, the power switch may be accidentally pressed. Utility Model Content

[0007] This utility model addresses the technical problems existing in the prior art by providing an amplifier that incorporates a Bluetooth circuit on the circuit control board inside the amplifier, enabling Bluetooth wireless connection between the user's mobile phone and the amplifier, providing an audio input port for easy insertion of audio cables, enabling wired or wireless audio input, achieving multi-channel audio signal input mode, improving the amplifier's practicality, and setting the power switch to a toggle adjustment mode to prevent users from accidentally touching the power switch.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A stereo amplifier with toggle adjustment is disclosed. The amplifier includes an amplifier housing and a circuit control board. The circuit control board is installed inside the amplifier housing. From left to right, the front end of the amplifier housing has a power toggle switch, a headphone jack, a volume control knob, and a stereo toggle switch. From left to right, the rear end of the amplifier housing has a Bluetooth antenna, a PRE output interface, an audio input port, an audio output terminal block, and a power supply interface. The circuit control board includes a Bluetooth circuit, a channel selection circuit, an RCA audio input circuit, a power module, a signal amplification circuit, a volume control circuit, a tone control module, a headphone output circuit, and a PRE output circuit. The RCA audio input circuit, Bluetooth circuit, channel selection circuit, volume control circuit, tone control module, and signal amplification circuit are electrically connected to the power module. The RCA audio input circuit and Bluetooth circuit are electrically connected to the channel selection circuit. The channel selection circuit is electrically connected to the volume control circuit. The volume control circuit is electrically connected to the tone control module. The tone control module is electrically connected to the headphone output circuit, signal amplification circuit, and PRE output circuit.

[0010] Furthermore, the tone control module includes a treble boosting circuit, a bass attenuation circuit, and a bass boosting circuit. One end of the treble boosting circuit is electrically connected to the volume control circuit, the other end of the treble boosting circuit is electrically connected to the bass attenuation circuit, and the bass attenuation circuit is electrically connected to the bass boosting circuit.

[0011] Furthermore, the Bluetooth circuit includes a Bluetooth module M1, a Bluetooth peripheral circuit, and an amplifier integrated circuit. The Bluetooth module M1 is model M1QCC3008, and the amplifier integrated circuit and the Bluetooth peripheral circuit are both electrically connected to the Bluetooth module M1.

[0012] Furthermore, the Bluetooth peripheral circuit includes an antenna ANT1, a header J1, resistors R106, R136, R72, a transistor Q2, resistors R135, R108, and R109. Pin 1 of the antenna ANT1 is electrically connected to pin 59 of the Bluetooth module M1. The Bluetooth module M1 is electrically connected to the amplifier integrated circuit via pins 54, 55, 56, and 57. Pins 1, 2, 3, and 4 of the header J1 are also included. The 15th, 16th, 17th and 14th pins of the Bluetooth module M1 are electrically connected. The 23rd pin of the Bluetooth module M1 is electrically connected to one end of resistor R108 and one end of resistor R109. One end of resistor R106 is electrically connected to the 24th pin of the Bluetooth module M1. The other end of resistor R106 is electrically connected to one end of resistor R136. The other end of resistor R136 and one end of resistor R72 are electrically connected to the collector of transistor Q2. The base of transistor Q2 is electrically connected to resistor R135.

[0013] Further, the channel selection circuit includes channel switching chip U1, channel switching chip U15, capacitor C94, resistors R31, R17, C96, R51, R46, R56, transistor N1, resistor R99, capacitor C100, capacitor C98, resistor R89, resistor R48, resistor R59, capacitor C97, and resistor R90. Channel switching chips U1 and U15 are both model SN74LVC1G3157. One end of capacitor C94 is connected to resistor R31. One end of capacitor C94 is electrically connected to the other end of resistor R4 in the RCA audio input circuit to achieve electrical connection between the RCA audio input circuit and the channel selection circuit. The other end of resistor R31 is electrically connected to pin 3 of channel switching chip U1. One end of resistor R17 is electrically connected to pin 1 of channel switching chip U1. One end of capacitor C96 is electrically connected to one end of resistor R51, and the other end of resistor R51 is electrically connected to pin 3 of channel switching chip U15 to achieve electrical connection between capacitor C96 and channel switching chip U15. One end of resistor R46 is electrically connected to pin 1 of channel switching chip U15, and the other end of resistor R46 is electrically connected to the Bluetooth circuit. One end of resistor R56 is electrically connected to the base of transistor N1. Pin 4 of channel switching chip U1 is electrically connected to one end of capacitor C98 and one end of resistor R48. The other end of capacitor C98 is electrically connected to one end of resistor R89, and the other end of resistor R89 ​​is electrically connected to the volume control circuit. Pin 4 of channel switching chip U15 is electrically connected to one end of resistor R59 and one end of capacitor C97. The capacitor C97 is connected to one end of the resistor R90, which is connected to the volume control circuit. One end of the resistor R99 is connected to pin 5 of the channel switching chip U15. One end of the capacitor C100 is connected to pins 5 of both the channel switching chip U1 and U15. The other end of the capacitor C100 is connected to the Bluetooth peripheral circuit of the Bluetooth circuit. Pins 6 of both the channel switching chip U1 and U15 are connected to the collector of the transistor N1.

[0014] Furthermore, the RCA audio input circuit includes a lotus connector AV1, resistors R4, R8, R12, R9, capacitors C45, C47, C91, and C92. The first pin of the lotus connector AV1 is electrically connected to one end of resistor R4 and one end of capacitor C45. The other end of resistor R4 is electrically connected to one end of resistor R12 and one end of capacitor C91. The other end of resistor R4 is also electrically connected to one end of capacitor C94 in the channel selection circuit. The second pin of the lotus connector AV1 is electrically connected to one end of capacitor C47 and one end of resistor R8. The other end of resistor R8 is electrically connected to one end of capacitor C92, one end of resistor R9, and one end of capacitor C96 in the channel selection circuit.

[0015] Furthermore, the PRE output circuit includes resistors R64, R66, R149, R24, and socket JK2. The third pin of socket JK2 is electrically connected to one end of resistor R149 and one end of resistor R64, and the other end of resistor R64 is electrically connected to the tone control module. The second pin of socket JK2 is electrically connected to one end of resistor R24 ​​and one end of resistor R66, and the other end of resistor R66 is electrically connected to the tone control module.

[0016] Furthermore, the headphone output circuit includes a headphone amplifier chip U6, resistor R96, capacitor C103, resistor R160, resistor R161, resistor R104, capacitor C102, capacitor C116, capacitor C115, and headphone jack JK1. The headphone amplifier chip U6 is a WTPA6132A2. One end of resistor R160 is electrically connected to one end of resistor R96 and one end of capacitor C103. The first pin of the headphone amplifier chip U6 is electrically connected to the other end of capacitor C103. One end of resistor R161 is electrically connected to one end of resistor R104 and one end of capacitor C102. The fourth pin of headphone amplifier chip U6 is electrically connected to the other end of capacitor C102. The two ends of capacitor C116 are electrically connected to the ninth and eleventh pins of headphone amplifier chip U6, respectively. Capacitor C115 is electrically connected to the eleventh pin of headphone amplifier chip U6. The fifth and eleventh pins of headphone amplifier chip U6 are electrically connected to the second and fifth pins of headphone jack JK1, respectively.

[0017] Furthermore, the audio input ports include a right channel input interface and a left channel input interface, which are arranged side by side on the rear panel of the amplifier housing.

[0018] Furthermore, a front cover is fixed to the front end of the amplifier housing, and the power toggle switch, headphone jack, volume control knob, and stereo toggle switch are distributed on the front cover from left to right. A rear panel is fixed to the rear end of the amplifier housing, and the Bluetooth antenna, PRE output interface, audio input port, audio output terminal block, and power supply interface are arranged on the rear panel.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The amplifier of this utility model includes an amplifier housing and a circuit control board. The circuit control board is installed inside the amplifier housing. From left to right, the front end of the amplifier housing has a power toggle switch, a headphone jack, a volume control knob, and a stereo toggle switch. From left to right, the rear end of the amplifier housing has a Bluetooth antenna, a PRE output interface, an audio input port, an audio output terminal block, and a power supply interface. The circuit control board includes a Bluetooth circuit, a channel selection circuit, an RCA audio input circuit, a power module, a signal amplification circuit, a volume control circuit, a tone control module, a headphone output circuit, and a PRE output circuit. The RCA audio input circuit, Bluetooth circuit, channel selection circuit, and volume control circuit are electrically connected to the power module. The RCA audio input circuit and Bluetooth circuit are electrically connected to the channel selection circuit. The channel selection circuit is electrically connected to the volume control circuit. The volume control circuit is electrically connected to the tone control module. The tone control module is electrically connected to the headphone output circuit, the signal amplification circuit, and the PRE output circuit. This utility model enables users' mobile phones or amplifiers to connect wirelessly via Bluetooth by setting up a Bluetooth circuit on the circuit control board. It also features an audio input port for easy insertion of audio cables, allowing for wired or wireless audio input and multi-channel audio signal input, thus improving the amplifier's usability. Furthermore, the power switch is set to a toggle adjustment mode to prevent users from accidentally touching the power switch. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the power amplifier of this utility model;

[0022] Figure 2 This is a schematic diagram of the power amplifier of this utility model from another angle;

[0023] Figure 3 This is an exploded view of the power amplifier of this utility model;

[0024] Figure 4 This is a signal flow diagram of each circuit module in the circuit control board of this utility model;

[0025] Figure 5 This is a circuit diagram of the Bluetooth circuit of this utility model;

[0026] Figure 6This is a circuit diagram of the channel selection circuit and the RCA audio input circuit of this utility model;

[0027] Figure 7 This is the circuit schematic diagram of the PRE output circuit of this utility model;

[0028] Figure 8 This is a circuit diagram of the treble boost circuit and bass attenuation circuit in the volume control circuit and tone control module of this utility model.

[0029] Figure 9 This is a circuit diagram of the bass boost circuit in the tone control module of this utility model;

[0030] Figure 10 This is a circuit diagram of the headphone output circuit of this utility model;

[0031] Figure 11 This is the circuit schematic diagram of the signal amplification circuit of this utility model;

[0032] Figure 12 This is the circuit schematic diagram of the power module of this utility model.

[0033] In the diagram: 1. Amplifier housing; 11. Front cover; 12. Rear panel; 13. Support base; 2. Circuit control board; 21. Volume control circuit; 22. Bluetooth circuit; 23. Channel selection circuit; 24. RCA audio input circuit; 25. Signal amplification circuit; 27. Tone control module; 28. Headphone output circuit; 29. ​​PRE output circuit; 210. Power module; 3. Power toggle switch; 4. Headphone jack; 5. Volume adjustment knob; 6. Stereo toggle switch; 7. Bluetooth antenna; 8. PRE output interface; 9. Audio input port; 10. Audio output terminal; 10. Power supply interface. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings, which form part of this specification. The principles of the present invention will be illustrated through embodiments, and other aspects, features, and advantages of the present invention will become apparent from this detailed description. In the accompanying drawings, the same or similar parts in different figures are indicated by the same reference numerals.

[0035] Example 1

[0036] like Figures 1-5As shown, this utility model provides a toggle-type stereo amplifier. The amplifier includes an amplifier housing 1 and a circuit control board 2. The circuit control board 2 is installed inside the amplifier housing 1. From left to right, the front end of the amplifier housing 1 is fixed with a power toggle switch 3, a headphone jack 4, a volume control knob 5, and a stereo toggle switch 6. From left to right, the rear end of the amplifier housing 1 is fixed with a Bluetooth antenna 7, a PRE output interface 8, an audio input port 9, an audio output terminal 10, and a power supply interface 101. The power toggle switch 3, headphone jack 4, volume control knob 5, stereo toggle switch 6, Bluetooth antenna 7, PRE output interface 8, audio input port 9, audio output terminal 10, and power supply interface 101 are all electrically connected to the circuit control board 2. Specifically, the audio input port 9 includes a right channel input interface and a left channel input interface. The amplifier housing 1 has two input interfaces: a right channel input interface and a left channel input interface, arranged side-by-side on the rear panel 12. Audio output terminals 10 include a first stereo output interface, a second stereo output interface, a third stereo output interface, and a fourth stereo output interface, arranged in a matrix on the rear panel 12. A front cover 11 is fixed to the front of the amplifier housing 1. A power toggle switch 3, a headphone jack 4, a volume control knob 5, and a stereo toggle switch 6 are arranged sequentially from left to right on the front cover 11. A rear panel is fixed to the rear of the amplifier housing 1. A Bluetooth antenna 7, a PRE output interface 8, an audio input port 9, audio output terminals 10, and a power supply interface 101 are arranged sequentially on the rear panel. The amplifier of this invention includes several supporting base columns 13, which are installed at the four lower corners of the amplifier housing 1. In this embodiment, the circuit control board 2 includes a Bluetooth circuit 22, a channel selection circuit 23, an RCA audio input circuit 24, a power module 210, a signal amplification circuit 25, a volume control circuit 21, a tone control module 27, a headphone output circuit 28, and a PRE output circuit 29. The RCA audio input circuit 24, Bluetooth circuit 22, channel selection circuit 23, volume control circuit 21, tone control module 27, and signal amplification circuit 25 are electrically connected to the power module 210. The RCA audio input circuit 24 and Bluetooth circuit 22 are electrically connected to the channel selection circuit 23. The channel selection circuit 23 is electrically connected to the volume control circuit 21. The volume control circuit 21 is electrically connected to the tone control module 27. The tone control module 27 is electrically connected to the headphone output circuit 28, the signal amplification circuit 25, and the PRE output circuit 29.

[0037] This utility model's amplifier can be turned on and off by tossing the power switch 3 up or down, and the stereo switch 6 can be tossed up or down to adjust the stereo sound. By setting the power switch 3 and stereo switch 6 to toggle adjustment modes, compared to traditional push-button switches, accidental activation of these switches can be avoided. A Bluetooth circuit 22 is included on the circuit control board 2, enabling wireless Bluetooth connection between the user's mobile phone and the amplifier. An audio input port 9 is provided for easy insertion of an audio cable. By setting up Bluetooth circuit 22 and audio input port 9, audio signal input can be facilitated, realizing wired or wireless audio input and achieving multi-channel audio signal input mode. The audio signal input mode can be selected through channel selection circuit 23, selecting Bluetooth or RCA audio input signal. The audio signal output by Bluetooth circuit 22 can be processed by RCA audio input circuit 24. The volume can be adjusted through audio control module. The signal amplification circuit 25 amplifies the signal and outputs it to audio output terminal 10 or headphone jack 4, realizing the diversity of audio signal sources and improving the practicality of the amplifier.

[0038] like Figures 6-12As shown, in this embodiment, the Bluetooth circuit 22 includes a Bluetooth module M1, Bluetooth peripheral circuits, and an amplifier integrated circuit. The Bluetooth module M1 is model M1QCC3008. Both the amplifier integrated circuit and the Bluetooth peripheral circuits are electrically connected to the Bluetooth module M1. The amplifier integrated circuit includes operational amplifiers IC2-A, IC2-B, and IC2-C, capacitors C8 and C10, resistors R110, R115, R111, and R114, capacitors C13 and C73, resistors R120, R117, R118, and R119, capacitors C17 and C74, a ferrite bead FB5, resistors R121 and C18, resistors R122, and an electrolytic capacitor C19. One end of capacitor C8 is electrically connected to one end of resistor R110, and pin 3 of operational amplifier IC2-A is connected to the other end of resistor R110. One end of resistor R115 is electrically connected to the terminal of IC2-A. The other end of capacitor C8 is electrically connected to pin 55 of Bluetooth module M1 to achieve electrical connection between the amplifier IC and Bluetooth module M1. One end of capacitor C10 is electrically connected to one end of resistor R111. Pin 2 of operational amplifier IC2-A is electrically connected to the other end of resistor R111, one end of resistor R114, and one end of capacitor C13. The other end of capacitor C10 is electrically connected to pin 54 of Bluetooth module M1. Pin 1 of operational amplifier IC2-A is electrically connected to one end of capacitor C73, the other end of capacitor C13, and the other end of resistor R114. One end of capacitor C15 is electrically connected to the terminal of IC2-A. One end of resistor R117 is electrically connected, and the other end of capacitor C15 is electrically connected to pin 57 of Bluetooth module M1. Pin 5 of operational amplifier IC2-B is electrically connected to the other end of resistor R117 and one end of resistor 120. One end of capacitor C16 is electrically connected to one end of resistor R118. Pin 6 of operational amplifier IC2-B is electrically connected to the other end of resistor R118, resistor R119, and one end of capacitor C17. The other end of capacitor C16 is electrically connected to pin 56 of Bluetooth module M1. Pin 7 of operational amplifier IC2-B is electrically connected to the other end of resistor R119 and the other end of capacitor C17. Pin 8 of IC2-C is electrically connected to one end of the ferrite bead FB5, one end of resistor R121, and one end of capacitor C18. The other end of resistor R121 is electrically connected to one end of resistor R122 and one end of electrolytic capacitor C19. The Bluetooth peripheral circuit includes antenna ANT1, header J1, resistors R106, R136, and R72, transistor Q2, resistors R135, R108, and R109. Pin 1 of antenna ANT1 is electrically connected to pin 59 of Bluetooth module M1. Bluetooth module M1 is electrically connected to amplifier integrated circuit through its pins 54, 55, 56, and 57.Pins 1, 2, 3, and 4 of header J1 are electrically connected to pins 15, 16, 17, and 14 of Bluetooth module M1. Pin 23 of Bluetooth module M1 is electrically connected to one end of resistor R108 and one end of resistor R109. One end of resistor R106 is electrically connected to pin 24 of Bluetooth module M1, and the other end of resistor R106 is electrically connected to one end of resistor R136. The other end of resistor R136 and one end of resistor R72 are electrically connected to the collector of transistor Q2. The base of transistor Q2 is electrically connected to resistor R135. The Bluetooth circuit 22 in this invention is mainly responsible for wireless audio transmission. It pairs with the mobile phone and transmits audio data through the Bluetooth protocol of Bluetooth module M1. When Bluetooth circuit 22 receives audio data, it converts it into an analog signal. The DSP (Digital Signal Processor) built into Bluetooth module M1 decodes the received audio data, and the decoded digital signal is converted into an analog audio signal output through the built-in DAC (Digital-to-Analog Converter).

[0039] In its specific implementation, the channel selection circuit 23 of this utility model includes channel switching chip U1, channel switching chip U15, capacitor C94, resistors R31, R17, C96, R51, R46, R56, transistor N1, resistor R99, capacitors C100, C98, R89, R48, R59, C97, and R90. Channel switching chips U1 and U15 are both model SN74LVC1G3157. One end of capacitor C94 is electrically connected to one end of resistor R31, and the other end of capacitor C94 is electrically connected to the other end of resistor R4 in the RCA audio input circuit 24. To achieve electrical connection between the RCA audio input circuit 24 and the channel selection circuit 23, the other end of resistor R31 is electrically connected to pin 3 of channel switching chip U1; one end of resistor R17 is electrically connected to pin 1 of channel switching chip U1; the other end of resistor R17 is electrically connected to the other end of capacitor C74 in Bluetooth circuit 22; one end of capacitor C96 is electrically connected to one end of resistor R51; the other end of resistor R51 is electrically connected to pin 3 of channel switching chip U15 to achieve electrical connection between capacitor C96 and channel switching chip U15; one end of resistor R46 is electrically connected to pin 1 of channel switching chip U15; the other end of resistor R46 is electrically connected to Bluetooth circuit 22. Specifically... In implementation, the other end of resistor R46 is electrically connected to the other end of capacitor C73 in Bluetooth circuit 22; one end of resistor R56 is electrically connected to the base of transistor N1; pin 4 of channel switching chip U1 is electrically connected to one end of capacitor C98 and one end of resistor R48; the other end of capacitor C98 is electrically connected to one end of resistor R89; and the other end of resistor R89 ​​is electrically connected to volume control circuit 21. Specifically, the other end of resistor R89 ​​is electrically connected to pin 3 of the first potentiometer VR1-A in volume control circuit 21; pin 4 of channel switching chip U15 is electrically connected to one end of resistor R59 and one end of capacitor C97; and the other end of capacitor C97 is electrically connected to one end of resistor R90. One end of the resistor R90 is electrically connected to the volume control circuit 21. Specifically, the first potentiometer VR1 of the volume control circuit 21 is electrically connected to the 6th pin. One end of the resistor R99 is electrically connected to the 5th pin of the channel switching chip U15. One end of the capacitor C100 is electrically connected to the 5th pins of the channel switching chips U1 and U15. The other end of the capacitor C100 is electrically connected to the Bluetooth peripheral circuit of the Bluetooth circuit 22. Specifically, the other end of the capacitor C100 is electrically connected to the resistor R108 of the Bluetooth peripheral circuit. The 6th pins of the channel switching chips U1 and U15 are electrically connected to the collector of the transistor N1.

[0040] The channel selection circuit 23 of this invention, in conjunction with channel switching chips U1 and U15 and transistor N1, achieves input channel selection. Pin 6 of channel switching chips U1 and U15 is the selection pin for selecting the input channel. Pins 1, 3, and 4 of channel switching chips U1 and U15 are the input channels. The input channel selection pin is electrically connected to the output of the Bluetooth circuit 22. The channel selection circuit 23 selects either Bluetooth or RCA audio signal input mode. The selected audio signal is sent to the tone control module 27. After processing by the tone control module 27, the audio signal is sent to the signal amplification circuit 25. The signal amplification circuit 25 amplifies the power of the audio signal and outputs it to the headphone output circuit 28 or the PRE output circuit 29. Specifically, when pin 6 of channel switching chips U1 and U15 is low (0V), pin 4 of channel switching chips U1 and U15 will output a signal; when pin 6 of channel switching chips U1 and U15 is high (3.3V or 5V), pins 1 and 3 of channel switching chips U1 and U15 will output signals. The channel selection circuit 23 designed in this invention is used to switch the input signal source of the power amplifier, and different audio input channels are selected through the channel selection circuit 23.

[0041] The RCA audio input circuit 24 of this utility model includes a lotus connector AV1, resistors R4, R8, R12, R9, capacitors C45, C47, C91, and C92. The first pin of the lotus connector AV1 is electrically connected to one end of resistor R4 and one end of capacitor C45. The other end of capacitor C45 is connected to analog ground. The other end of resistor R4 is electrically connected to one end of resistor R12 and one end of capacitor C91. The other end of resistor R4 is also electrically connected to one end of capacitor C94 in the channel selection circuit 23. The other ends of resistor R12 and capacitor C91 are connected to analog ground. The third and fourth pins of the lotus connector AV1 are connected to analog ground. The second pin of the lotus connector AV1 is electrically connected to one end of capacitor C47 and one end of resistor R8. The other end of capacitor C47 is connected to analog ground. The other end of resistor R8 is electrically connected to one end of capacitor C92, one end of resistor R9, and one end of capacitor C96 in the channel selection circuit 23. The other ends of capacitor C92 and resistor R9 are connected to analog ground.

[0042] In this embodiment, the PRE output circuit 29 includes resistors R64, R66, R149, R24, and socket JK2. Pin 3 of socket JK2 is electrically connected to one end of resistor R149 and one end of resistor R64. The other end of resistor R64 is electrically connected to tone control module 27. Specifically, the other end of resistor R64 is electrically connected to one end of capacitor C89 in the volume control circuit. Pin 2 of socket JK2 is electrically connected to one end of resistor R24 ​​and one end of resistor R66. The other end of resistor R66 is electrically connected to tone control module 27. Specifically, the other end of resistor R66 is electrically connected to one end of capacitor C14 in the volume control circuit. Pins 1, 4, and 5 of socket JK2, the other end of resistor R149, and the other end of resistor R24 ​​are connected to analog ground.

[0043] In a specific implementation, the tone control module 27 includes a treble boosting circuit, a bass attenuation circuit, and a bass boosting circuit. One end of the treble boosting circuit is electrically connected to the volume control circuit 21, the other end of the treble boosting circuit is electrically connected to the bass attenuation circuit, and the bass attenuation circuit is electrically connected to the bass boosting circuit. The volume control circuit 21 of this utility model includes a potentiometer VR1-A, an operational amplifier U4-A, a capacitor C31, a resistor R23, a capacitor C81, a resistor R100, a capacitor C34, a resistor R27, a resistor R102, a resistor R123, a resistor R91, a potentiometer VR1-B, an operational amplifier U4-B, a capacitor C32, a resistor R26, a capacitor C82, a resistor R112, a capacitor C33, and a resistor R21. Operational amplifiers U4-A and U4-B are model 4558. One end of capacitor C31 is electrically connected to one end of resistor R23. The second pin of potentiometer VR1-A is electrically connected to the other end of capacitor C31. One end of capacitor C81 is electrically connected to one end of resistor R100. The third pin of operational amplifier U4-A is electrically connected to the other end of resistor R23 and one end of resistor R102. One end of resistor R123 is electrically connected to the other end of resistor R102. Pin 2 of operational amplifier U4-A is electrically connected to the other end of R100, one end of capacitor C34, and one end of resistor R27. Pin 1 of operational amplifier U4-A is electrically connected to the other end of capacitor C34, the other end of resistor R27, and one end of resistor R18 in the tweeter boosting circuit. One end of capacitor C32 is electrically connected to one end of resistor R26. Pin 5 of potentiometer VR1-B is electrically connected to the other end of capacitor C32. Pin 5 of operational amplifier U4-B is electrically connected to the other end of resistor R26 and the other end of resistor R123. One end of capacitor C82 is electrically connected to one end of resistor R112. Pin 6 of operational amplifier U4-B is electrically connected to the other end of resistor R112, one end of capacitor C33, and one end of resistor R21. Pin 7 of operational amplifier U4-B is electrically connected to one end of capacitor C33, the other end of resistor R21, and one end of resistor R88 in the tweeter boosting circuit.The tweeter boost circuit includes resistor R18, capacitor C30, operational amplifier U5-A, resistor R58, capacitor C39, resistor R33, capacitor C4, resistor R88, capacitor C42, operational amplifier U5-B, resistor R159, capacitor C43, resistor R92, and capacitor C72. Operational amplifiers U5-A and U5-B are model 5532. Pin 2 of operational amplifier U5-A is electrically connected to the other end of resistor R18, one end of resistor R33, and one end of capacitor C4. Pin 1 of operational amplifier U5-A is connected to the other end of resistor R33. The other end of capacitor C4 is electrically connected to one end of resistor R163 in the bass attenuation circuit. Pin 3 of operational amplifier U5-A is electrically connected to one end of capacitor C30, one end of resistor R58, and one end of capacitor C39. Pin 6 of operational amplifier U5-B is electrically connected to the other end of resistor R88, one end of resistor R92, and one end of capacitor C72. Pin 7 of operational amplifier U5-B is electrically connected to the other end of resistor R92, the other end of capacitor C72, and one end of resistor R175 in the bass attenuation circuit. Pin 5 of operational amplifier U5-B is electrically connected to capacitor C42. One end of resistor R159 and one end of capacitor C43 are electrically connected; the bass attenuation circuit includes resistor R163, capacitor C52, resistor R170, operational amplifier U8-A, resistor R164, capacitor C53, resistor R175, capacitor C83, resistor R182, operational amplifier U8-B, resistor R176, and capacitor C84. Operational amplifiers U8-A and U8-B are model 5532. Pin 2 of operational amplifier U8-A is electrically connected to the other end of resistor R163, one end of resistor R164, and one end of capacitor C53. Pin 3 of amplifier U8-A is electrically connected to one end of capacitor C52 and one end of resistor R170. Pin 1 of operational amplifier U8-A is electrically connected to the other end of resistor R164 and the other end of capacitor C53. Pin 6 of operational amplifier U8-B is electrically connected to the other end of resistor R175, one end of resistor R176, and one end of capacitor C84. Pin 5 of operational amplifier U8-B is electrically connected to one end of capacitor C83 and one end of resistor R182. Pin 7 of operational amplifier U8-B is electrically connected to the other end of resistor R176 and the other end of capacitor C84.

[0044] The headphone output circuit 28 of this utility model includes a headphone amplifier chip U6, resistor R96, capacitor C103, resistor R160, resistor R161, resistor R104, capacitor C102, capacitor C116, capacitor C115, and headphone jack JK1. The headphone amplifier chip U6 is a WTPA6132A2. One end of resistor R160 is electrically connected to one end of resistor R96 and one end of capacitor C103. Pin 1 of the headphone amplifier chip U6 is connected to the other end of capacitor C103. The terminals are electrically connected as follows: one end of resistor R161 is electrically connected to one end of resistor R104 and one end of capacitor C102; pin 4 of headphone amplifier chip U6 is electrically connected to the other end of capacitor C102; the two ends of capacitor C116 are electrically connected to pins 9 and 11 of headphone amplifier chip U6, respectively; capacitor C115 is electrically connected to pin 12 of headphone amplifier chip U6; and pins 5 and 16 of headphone amplifier chip U6 are electrically connected to pins 2 and 5 of headphone jack JK1, respectively.

[0045] In a specific implementation of this utility model embodiment, the signal amplification circuit 25 includes an audio amplification chip IC1, capacitors C64 and C5, resistors R76 and R86, capacitors C11, C12, C1, and C21, inductors L4 and L5, an audio output pin header CN1, an audio amplification chip IC4, capacitors C79 and C76, resistors R84, R75, and R85, capacitors C6, C9, C35, and C51, inductors L1 and L3, and an audio output pin header CN2. The audio amplification chips IC1 and IC4 are of model TPA3116D2. The audio amplification chip IC1... Pin 3 is electrically connected to resistor R7. Pin 4 of audio amplifier chip IC1 is electrically connected to capacitor C64. Pin 5 of audio amplifier chip IC1 is electrically connected to capacitor C5. Pin 6 of audio amplifier chip IC1 is electrically connected to resistor R76. Pin 12 of audio amplifier chip IC1 is electrically connected to resistor R86. Pin 30 of audio amplifier chip IC1 is electrically connected to one end of capacitor C11. Pin 26 of audio amplifier chip IC1 is electrically connected to one end of capacitor C12. The other ends of capacitors C11 and C12 are both electrically connected to one end of inductor L4. The other end of inductor L4 is electrically connected to pin 1 of audio output connector CN1. Pin 24 of IC1 is electrically connected to one end of capacitor C1. Pin 20 of IC1 is electrically connected to one end of capacitor C21. The other ends of capacitors C1 and C21 are both electrically connected to one end of inductor L5. The other end of inductor L5 is electrically connected to pin 2 of audio output connector CN1. Pin 3 of IC4 is electrically connected to resistor R84. Pin 4 of IC4 is electrically connected to capacitor C79. Pin 5 of IC4 is electrically connected to capacitor C76. Pin 6 of IC4 is electrically connected to resistor R75. Pin 12 of IC4 is electrically connected to resistor R85. Then, pin 30 of audio amplifier chip IC4 is electrically connected to one end of capacitor C6, pin 26 of audio amplifier chip IC4 is electrically connected to one end of capacitor C9, the other ends of capacitor C6 and capacitor C9 are both electrically connected to one end of inductor L1, the other end of inductor L1 is electrically connected to pin 1 of audio output pin socket CN2, pin 24 of audio amplifier chip IC4 is electrically connected to one end of capacitor C35, pin 20 of audio amplifier chip IC4 is electrically connected to one end of capacitor C51, the other ends of capacitor C35 and capacitor C51 are both electrically connected to one end of inductor L3, the other end of inductor L3 is electrically connected to pin 2 of audio output pin socket CN2.

[0046] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of this application. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A push-type stereo regulating power amplifier, characterized by: The power amplifier comprises a power amplifier shell and a circuit control board, the circuit control board is installed in the inside of the power amplifier shell, the front end of the power amplifier shell is fixed with a power source toggle switch, an earphone interface, a volume adjusting knob and a stereo sound toggle switch from left to right, the rear end plate of the power amplifier shell is sequentially fixed with a Bluetooth antenna, a PRE output interface, an audio input port, an audio output terminal post and a power supply interface from left to right, the circuit control board comprises a Bluetooth circuit, a channel selection circuit, an RCA audio input circuit, a power module, a signal amplification circuit, a volume control circuit, a tone control module, an earphone output circuit and a PRE output circuit, the RCA audio input circuit, the Bluetooth circuit, the channel selection circuit, the volume control circuit, the tone control module and the signal amplification circuit are electrically connected with the power module, the RCA audio input circuit, the Bluetooth circuit and the channel selection circuit are electrically connected, the channel selection circuit and the volume control circuit are electrically connected, the volume control circuit and the tone control module are electrically connected, and the tone control module is electrically connected with the earphone output circuit, the signal amplification circuit and the PRE output circuit.

2. The push-type adjustable stereo power amplifier of claim 1, wherein: The tone control module comprises a treble boost circuit, a bass attenuation circuit and a bass boost circuit, one end of the treble boost circuit is electrically connected with the volume control circuit, the other end of the treble boost circuit is electrically connected with the bass attenuation circuit, and the bass attenuation circuit is electrically connected with the bass boost circuit.

3. The push-type adjustable stereo power amplifier of claim 1, wherein: The Bluetooth circuit comprises a Bluetooth module M1, a Bluetooth peripheral circuit and an amplifier integrated circuit, the Bluetooth module M1 is of M1QCC3008 type, and the amplifier integrated circuit and the Bluetooth peripheral circuit are electrically connected with the Bluetooth module M1.

4. The push-type adjustable stereo power amplifier of claim 3, wherein: The Bluetooth peripheral circuit comprises an antenna ANT1, a pin J1, a resistor R106, a resistor R136, a resistor R72, a triode Q2, a resistor R135, a resistor R108 and a resistor R109, the first pin of the antenna ANT1 is electrically connected with the 59th pin of the Bluetooth module M1, the Bluetooth module M1 is electrically connected with the amplifier integrated circuit through the 54th pin, the 55th pin, the 56th pin and the 57th pin, the first pin, the second pin, the third pin and the fourth pin of the pin J1 are electrically connected with the 15th pin, the 16th pin, the 17th pin and the 14th pin of the Bluetooth module M1, the 23rd pin of the Bluetooth module M1 is electrically connected with one end of the resistor R108 and one end of the resistor R109, one end of the resistor R106 is electrically connected with the 24th pin of the Bluetooth module M1, the other end of the resistor R106 is electrically connected with one end of the resistor R136, the other end of the resistor R136 and one end of the resistor R72 are electrically connected with the collector of the triode Q2, and the base of the triode Q2 is electrically connected with the resistor R135.

5. The push-type adjustable stereo power amplifier of claim 1, wherein: The channel selection circuit comprises channel switching chip U1, channel switching chip U15, capacitor C94, resistor R31, resistor R17, capacitor C96, resistor R51, resistor R46, resistor R56, triode N1, resistor R99, capacitor C100, capacitor C98, resistor R89, resistor R48, resistor R59, capacitor C97 and resistor R90. The models of the channel switching chip U1 and the channel switching chip U15 are both SN74LVC1G3157. One end of the capacitor C94 is electrically connected with one end of the resistor R31, and the other end of the capacitor C94 is electrically connected with the other end of the resistor R4 in the RCA audio input circuit to realize the electrical connection between the RCA audio input circuit and the channel selection circuit. The other end of the resistor R31 is electrically connected with the third pin of the channel switching chip U1. One end of the resistor R17 is electrically connected with the first pin of the channel switching chip U1. One end of the capacitor C96 is electrically connected with one end of the resistor R51, and the other end of the resistor R51 is electrically connected with the third pin of the channel switching chip U15 to realize the electrical connection between the capacitor C96 and the channel switching chip U15. One end of the resistor R46 is electrically connected with the first pin of the channel switching chip U15, and the other end of the resistor R46 is electrically connected with the Bluetooth circuit. One end of the resistor R56 is electrically connected with the base of the triode N1. The fourth pin of the channel switching chip U1 is electrically connected with one end of the capacitor C98 and one end of the resistor R48. The other end of the capacitor C98 is electrically connected with one end of the resistor R89. The other end of the resistor R89 is electrically connected with the volume control circuit. The fourth pin of the channel switching chip U15 is electrically connected with one end of the resistor R59 and one end of the capacitor C97. The other end of the capacitor C97 is electrically connected with one end of the resistor R90. The other end of the resistor R90 is electrically connected with the volume control circuit. One end of the resistor R99 is electrically connected with the fifth pin of the channel switching chip U15. One end of the capacitor C100 is electrically connected with the fifth pin of the channel switching chip U1 and the fifth pin of the channel switching chip U15. The other end of the capacitor C100 is electrically connected with the Bluetooth peripheral circuit of the Bluetooth circuit. The sixth pin of the channel switching chip U1 and the sixth pin of the channel switching chip U15 are electrically connected with the collector of the triode N1.

6. The push-type adjustable stereo power amplifier of claim 1, wherein: The RCA audio input circuit comprises lotus seat AV1, resistor R4, resistor R8, resistor R12, resistor R9, capacitor C45, capacitor C47, capacitor C91 and capacitor C92. The first pin of the lotus seat AV1 is electrically connected with one end of the resistor R4 and one end of the capacitor C45. The other end of the resistor R4 is electrically connected with one end of the resistor R12 and one end of the capacitor C91. The other end of the resistor R4 is also electrically connected with one end of the capacitor C94 in the channel selection circuit. The second pin of the lotus seat AV1 is electrically connected with one end of the capacitor C47 and one end of the resistor R8. The other end of the resistor R8 is electrically connected with one end of the capacitor C92, one end of the resistor R9 and one end of the capacitor C96 in the channel selection circuit.

7. The push-type adjustable stereo power amplifier of claim 1, wherein: The PRE output circuit comprises a resistor R64, a resistor R66, a resistor R149, a resistor R24, a socket JK2, a third pin of the socket JK2 is electrically connected with one end of the resistor R149 and one end of the resistor R64, the other end of the resistor R64 is electrically connected with the tone control module, a second pin of the socket JK2 is electrically connected with one end of the resistor R24 and one end of the resistor R66, the other end of the resistor R66 is electrically connected with the tone control module.

8. The push-type adjustable stereo power amplifier of claim 2, wherein: The earphone output circuit comprises an earphone chip U6, a resistor R96, a capacitor C103, a resistor R160, a resistor R161, a resistor R104, a capacitor C102, a capacitor C116, a capacitor C115, and a socket JK1, the earphone chip U6 is WTPA6132A2, one end of the resistor R160 is electrically connected with one end of the resistor R96 and one end of the capacitor C103, a first pin of the earphone chip U6 is electrically connected with the other end of the capacitor C103, one end of the resistor R161 is electrically connected with one end of the resistor R104 and one end of the capacitor C102, a fourth pin of the earphone chip U6 is electrically connected with the other end of the capacitor C102, the capacitor C116 is electrically connected with a ninth pin and an eleventh pin of the earphone chip U6, the capacitor C115 is electrically connected with a twelfth pin of the earphone chip U6, a fifth pin and a sixteenth pin of the earphone chip U6 are electrically connected with a second pin and a fifth pin of the socket JK1 respectively.

9. The push-type adjustable stereo power amplifier of claim 1, wherein: The audio input port comprises a right channel input interface and a left channel input interface, and the right channel input interface and the left channel input interface are distributed on the rear panel of the power amplifier shell in parallel.

10. The push-type adjustable stereo power amplifier of claim 1, wherein: The front end of the power amplifier shell is fixed with a front cover plate, the power supply toggle switch, the earphone interface, the volume adjusting knob, and the stereo toggle switch are distributed on the front cover plate from left to right in sequence, the rear end of the power amplifier shell is fixed with a rear back plate, and the Bluetooth antenna, the PRE output interface, the audio input port, the audio output terminal post, and the power supply interface are arranged on the rear back plate in sequence. The front end of the power amplifier shell is fixed with a front cover plate, the power supply toggle switch, the earphone interface, the volume adjusting knob, and the stereo toggle switch are distributed on the front cover plate from left to right in sequence, the rear end of the power amplifier shell is fixed with a rear back plate, and the Bluetooth antenna, the PRE output interface, the audio input port, the audio output terminal post, and the power supply interface are arranged on the rear back plate in sequence.

Images