CN209994351U

CN209994351U - Audio amplification circuit for sound control power supply

Info

Publication number: CN209994351U
Application number: CN201920910628.3U
Authority: CN
Inventors: 熊浩; 王陆; 温长康
Original assignee: Tianjin Bridge College Of Kunming University Of Science And Technology
Current assignee: Tianjin Bridge College Of Kunming University Of Science And Technology
Priority date: 2019-06-18
Filing date: 2019-06-18
Publication date: 2020-01-24
Anticipated expiration: 2029-06-18

Abstract

The utility model provides an audio amplifier circuit for acoustic control power, its audio signal input that gathers intelligent power carries out the one-level amplification to the common emitter amplifier circuit who is the core by NPN triode Q1, simultaneously through resistance R3, the feedback network that electric capacity C1 constitutes, keep the signal pure and stable, the signal after further the amplification passes through electrolytic capacitor coupling to put on U1 is the amplifier circuit of core constitution by integrated fortune, simultaneously through resistance R5, the negative feedback network stable signal that electric capacity C2 constitutes, the signal after further the amplification passes through electrolytic capacitor C6 coupling to the amplifier circuit who comprises triode NPN Q2 for the core on, carry out current amplification, after electric capacity C3 filters, by electrolytic capacitor C7 coupling output, the audio frequency is through this circuit amplification, after the plastic, the audio frequency characteristic of original signal has been kept.

Description

Audio amplification circuit for sound control power supply

Technical Field

The utility model relates to an audio amplification circuit for acoustic control power.

Background

At present, intelligent power supplies are developed very rapidly, various new technologies are continuously used in the intelligent power supplies, language control of the intelligent power supplies is a very important research direction, the difficulty of the language control is sampling and recognition, and the premise that the two aspects are good is that audio signals are collected and processed without distortion.

Disclosure of Invention

The utility model discloses a solve above-mentioned problem, provide audio amplification circuit for acoustic control power. The circuit has the advantages of simple design, few used devices, and small distortion while achieving the purpose of sufficient amplification of the audio signal.

In order to achieve the above object, the utility model adopts the following technical scheme: the audio amplifying circuit for the sound control power supply comprises a resistor R1, a resistor R3, a resistor R2, a resistor R5, a capacitor C2, an electrolytic capacitor C5, a resistor R6, a resistor R7, an electrolytic capacitor C4, a capacitor C1, an NPN triode Q1, an integrated operational amplifier U1, a resistor R4, an electrolytic capacitor C6, an NPN triode Q2, a resistor R8, an electrolytic capacitor C7 and a capacitor C3; an audio signal collected by an intelligent power supply is input into a common emitter amplifying circuit with an NPN triode Q1 as a core for primary amplification, meanwhile, the purity and stability of the signal are kept through a feedback network formed by a resistor R3 and a capacitor C1, the further amplified signal is coupled to the amplifying circuit with an integrated operational amplifier U1 as the core through an electrolytic capacitor (C5), the signal is stabilized through a negative feedback network formed by a resistor R5 and a capacitor C2, the further amplified signal is coupled to the amplifying circuit with the NPN triode Q2 as the core through an electrolytic capacitor C6 for current amplification, the amplified signal is coupled and output by an electrolytic capacitor C7 after being filtered by a capacitor C3, and the audio frequency is amplified and shaped through the circuit, so that the audio frequency characteristic of the original signal is kept, and a foundation is laid for the next audio sampling and identification.

Further, +12VDC is connected with the upper end of a resistor R1, the upper end of a resistor R2, the upper end of a resistor R6, the upper end of a resistor R7 and a pin 8 of an integrated operational amplifier U1; the base electrode of the NPN triode Q1 is connected with the cathode of the electrolytic capacitor C4, the lower end of the resistor R1, the left end of the resistor R3 and the left end of the capacitor C1; the collector of the NPN triode Q1 is connected with the right end of a resistor R3, the right end of a capacitor C1, the lower end of a resistor R2 and the anode of an electrolytic capacitor C5; the anode of the electrolytic capacitor C4 is connected with an audio input signal; the integrated operational amplifier U1 pin 2 is connected with the cathode of an electrolytic capacitor C5, the left end of a resistor R6 and the left end of a capacitor C2; the integrated operational amplifier U1 pin 3 is connected with the upper end of a resistor R4; the integrated operational amplifier U1 pin 1 is connected with the right end of a resistor R6, the right end of a capacitor C2 and the anode of an electrolytic capacitor C6; the base electrode of the NPN triode Q2 is connected with the cathode of the electrolytic capacitor C6 and the upper end of the resistor R6; the collector of the NPN triode Q2 is connected with the upper end of the resistor R7; an emitter of the NPN triode Q2 is connected with the upper end of a resistor R8, the upper end of a capacitor C3 and the anode of an electrolytic capacitor C7; the cathode of the electrolytic capacitor C7 is connected with an audio output signal; the ground is connected with a pin 4 of the integrated operational amplifier U1, an emitter of an NPN triode Q1, the lower end of a resistor R4, the lower end of a resistor R8 and the lower end of a capacitor C3.

The model of the integrated operational amplifier U1 is AD 647.

The model numbers of the NPN triode Q1 and the NPN triode Q2 are 2N 3392.

The utility model discloses following beneficial effect has: the utility model discloses with using few separator, realized having had very high price/performance ratio to the little target of audio signal fully enlargies and distortion, had popularization and application and worth.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without paying attention to inventive laboriousness.

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, the audio amplifier circuit for a voice-controlled power supply includes a resistor R1 (1), a resistor R3 (2), a resistor R2 (3), a resistor R5 (4), a capacitor C2 (5), an electrolytic capacitor C5 (6), a resistor R6 (7), a resistor R7 (8), an electrolytic capacitor C4 (9), a capacitor C1 (10), an NPN transistor Q1 (11), an integrated operational amplifier U1 (12), a resistor R4 (13), an electrolytic capacitor C6 (14), an NPN transistor Q2 (15), a resistor R8 (16), an electrolytic capacitor C7 (17), and a capacitor C3 (18). The audio signal collected by the intelligent power supply is input into a common emitter amplifying circuit taking an NPN triode Q1 (11) as a core for primary amplification, meanwhile, the purity and stability of signals are kept through a feedback network consisting of a resistor R3 (2) and a capacitor C1 (10), the further amplified signals are coupled to an amplifying circuit which is formed by taking an integrated operational amplifier U1 (12) as a core through an electrolytic capacitor (C5), meanwhile, a signal is stabilized through a negative feedback network consisting of a resistor R5 (4) and a capacitor C2 (5), the further amplified signal is coupled to an amplifying circuit consisting of an NPN triode Q2 (15) as a core through an electrolytic capacitor C6 (14) for current amplification, and after the current amplification is carried out through filtering of a capacitor C3 (18), the audio is coupled and output by an electrolytic capacitor C7 (17), after the audio is amplified and shaped by the circuit, the audio characteristics of the original signal are kept, and a foundation is laid for the audio sampling and identification in the next step. The +12VDC is connected with the upper end of a resistor R1 (1), the upper end of a resistor R2 (3), the upper end of a resistor R6 (7), the upper end of a resistor R7 (8) and a pin 8 of an integrated operational amplifier U1 (12); the base electrode of the NPN triode Q1 (11) is connected with the cathode of the electrolytic capacitor C4 (9), the lower end of the resistor R1 (1), the left end of the resistor R3 (2) and the left end of the capacitor C1 (10); the collector of the NPN triode Q1 (11) is connected with the right end of the resistor R3 (2), the right end of the capacitor C1 (10), the lower end of the resistor R2 and the anode of the electrolytic capacitor C5 (6); the anode of the electrolytic capacitor C4 (9) is connected with an audio input signal; the pin 2 of the integrated operational amplifier U1 (12) is connected with the cathode of an electrolytic capacitor C5 (6), the left end of a resistor R6 (7) and the left end of a capacitor C2 (5); the pin 3 of the integrated operational amplifier U1 (12) is connected with the upper end of a resistor R4 (13); the pin 1 of the integrated operational amplifier U1 (12) is connected with the right end of a resistor R6 (7), the right end of a capacitor C2 (5) and the anode of an electrolytic capacitor C6 (14); the base electrode of the NPN triode Q2 (15) is connected with the cathode of the electrolytic capacitor C6 (14) and the upper end of the resistor R6 (7); the collector of the NPN triode Q2 (15) is connected with the upper end of a resistor R7 (8); an emitter of the NPN triode Q2 (15) is connected with the upper end of a resistor R8 (16), the upper end of a capacitor C3 (18) and the anode of an electrolytic capacitor C7 (17); the cathode of the electrolytic capacitor C7 (17) is connected with an audio output signal; the ground is connected with a pin 4 of the integrated operational amplifier U1 (12), an emitter of an NPN triode Q1 (11), the lower end of a resistor R4 (13), the lower end of a resistor R8 (16) and the lower end of a capacitor C3 (18). The model of the integrated operational amplifier U1 is AD 647. The model of the NPN triode Q1 (11) and the model of the NPN triode Q2 (15) are 2N 3392.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Audio amplifier circuit for acoustic control power supply, its characterized in that: the device comprises a resistor R1 (1), a resistor R3 (2), a resistor R2 (3), a resistor R5 (4), a capacitor C2 (5), an electrolytic capacitor C5 (6), a resistor R6 (7), a resistor R7 (8), an electrolytic capacitor C4 (9), a capacitor C1 (10), an NPN triode Q1 (11), an integrated operational amplifier U1 (12), a resistor R4 (13), an electrolytic capacitor C6 (14), an NPN triode Q2 (15), a resistor R8 (16), an electrolytic capacitor C7 (17) and a capacitor C3 (18); the +12VDC is connected with the upper end of a resistor R1 (1), the upper end of a resistor R2 (3), the upper end of a resistor R6 (7), the upper end of a resistor R7 (8) and a pin 8 of an integrated operational amplifier U1 (12); the base electrode of the NPN triode Q1 (11) is connected with the cathode of the electrolytic capacitor C4 (9), the lower end of the resistor R1 (1), the left end of the resistor R3 (2) and the left end of the capacitor C1 (10); the collector of the NPN triode Q1 (11) is connected with the right end of the resistor R3 (2), the right end of the capacitor C1 (10), the lower end of the resistor R2 and the anode of the electrolytic capacitor C5 (6); the anode of the electrolytic capacitor C4 (9) is connected with an audio input signal; the pin 2 of the integrated operational amplifier U1 (12) is connected with the cathode of an electrolytic capacitor C5 (6), the left end of a resistor R6 (7) and the left end of a capacitor C2 (5); the pin 3 of the integrated operational amplifier U1 (12) is connected with the upper end of a resistor R4 (13); the pin 1 of the integrated operational amplifier U1 (12) is connected with the right end of a resistor R6 (7), the right end of a capacitor C2 (5) and the anode of an electrolytic capacitor C6 (14); the base electrode of the NPN triode Q2 (15) is connected with the cathode of the electrolytic capacitor C6 (14) and the upper end of the resistor R6 (7); the collector of the NPN triode Q2 (15) is connected with the upper end of a resistor R7 (8); an emitter of the NPN triode Q2 (15) is connected with the upper end of a resistor R8 (16), the upper end of a capacitor C3 (18) and the anode of an electrolytic capacitor C7 (17); the cathode of the electrolytic capacitor C7 (17) is connected with an audio output signal; the ground is connected with a pin 4 of the integrated operational amplifier U1 (12), an emitter of an NPN triode Q1 (11), the lower end of a resistor R4 (13), the lower end of a resistor R8 (16) and the lower end of a capacitor C3 (18);

the audio signal collected by the intelligent power supply is input into a common emitter amplifying circuit taking an NPN triode Q1 (11) as a core for primary amplification, meanwhile, the purity and stability of signals are kept through a feedback network consisting of a resistor R3 (2) and a capacitor C1 (10), the further amplified signals are coupled to an amplifying circuit which is formed by taking an integrated operational amplifier U1 (12) as a core through an electrolytic capacitor (C5), meanwhile, a signal is stabilized through a negative feedback network consisting of a resistor R5 (4) and a capacitor C2 (5), the further amplified signal is coupled to an amplifying circuit consisting of an NPN triode Q2 (15) as a core through an electrolytic capacitor C6 (14) for current amplification, and after the current amplification is carried out through filtering of a capacitor C3 (18), the audio is coupled and output by an electrolytic capacitor C7 (17), after the audio is amplified and shaped by the circuit, the audio characteristics of the original signal are kept, and a foundation is laid for the audio sampling and identification in the next step.

2. The audio amplifier circuit for a voice-controlled power supply according to claim 1, wherein: the model of the integrated operational amplifier U1 is AD 647.

3. The audio amplifier circuit for a voice-controlled power supply according to claim 1, wherein: the model of the NPN triode Q1 (11) and the model of the NPN triode Q2 (15) are 2N 3392.