CN203301424U - Noise-reducing type audio signal amplifying circuit - Google Patents
Noise-reducing type audio signal amplifying circuit Download PDFInfo
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- CN203301424U CN203301424U CN2013203552601U CN201320355260U CN203301424U CN 203301424 U CN203301424 U CN 203301424U CN 2013203552601 U CN2013203552601 U CN 2013203552601U CN 201320355260 U CN201320355260 U CN 201320355260U CN 203301424 U CN203301424 U CN 203301424U
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Abstract
The utility model discloses a noise-reducing type audio signal amplifying circuit which mainly solves the problem that audio frequency amplifiers in the prior art are low in cost performance and not beneficial to application to some low-cost small devices. The noise-reducing type audio signal amplifying circuit comprises an audio signal collecting circuit, an operational amplifier T1, a low-pass filter circuit and a signal amplification circuit. The inverted input end of the operational amplifier T1 is connected with the output end of the audio signal collecting circuit through a resistor R4 while the output end of the same is connected with the output end of the audio signal collecting circuit through a diode D1. The low-pass filter circuit is connected with the inverted input end of the operational amplifier T1. The input end of the signal amplification circuit is connected with the low-pass filter circuit. The output end and the inverted input end of the operational amplifier T1 are connected through a diode D2. By the scheme, the noise-reducing type audio signal amplifying circuit is high in cost performance, small in overall size and applicable to the low-cost small devices, and has high practical value and promotional value.
Description
Technical field
The utility model relates to a kind of amplifying circuit, specifically, relates to a kind of noise reducing type amplifier circuit for sound frequency signal.
Background technology
As everyone knows, audio frequency amplifier is device very important in the communication technology, in order to improve the effect of amplifier, often need to connect in addition comparatively complicated anti-interference device, in the time of can causing like this use, overall volume is larger, and cost is higher, is unfavorable for some mini-plant uses cheaply.
The utility model content
The purpose of this utility model is to provide a kind of noise reducing type amplifier circuit for sound frequency signal, mainly solves the audio frequency amplifier cost performance that exists in prior art not high, is unfavorable for the problem of some mini-plant uses cheaply.
To achieve these goals, the technical solution adopted in the utility model is as follows:
the noise reducing type amplifier circuit for sound frequency signal, comprise the audio signal sample circuit, inverting input is connected with the output of audio signal sample circuit by resistance R 4, and the operational amplifier T1 that output is connected with the output of audio signal sample circuit by diode D1, and the low-pass filter circuit that is connected with the inverting input of operational amplifier T1, the signal amplification circuit that input is connected with low-pass filter circuit, the output of described operational amplifier T1 is connected by diode D2 with inverting input, described signal amplification circuit comprises the triode Q3 that base stage is connected with the output of low-pass filter circuit, the operational amplifier T4 that is connected with the emitter of triode Q3 by electrochemical capacitor C6, be connected in inverting input and the capacitor C between output 7 of operational amplifier T4, the circuit U 1 in parallel with capacitor C 7, described circuit U 1 is by the capacitor C 8 of mutual series connection, resistance R 14 forms.
Specifically, described audio signal sample circuit comprises triode Q1, the triode Q2 that base stage is connected with the collector electrode of triode Q1, between the collector electrode that is connected in triode Q2 and ground and capacitor C 1 and the resistance R 3 of mutually connecting, be connected in the base stage of triode Q1 and the buzzing sheet U between ground, described resistance R 4 one ends are connected with the collector electrode of triode Q2, the other end is connected with the inverting input of operational amplifier T1, and described diode D1 mono-end is connected with the collector electrode of triode Q2, the other end is connected with the output of operational amplifier T1.
In order to improve whole structure, the base stage of described triode Q1 is connected with pull-up resistor R1, and the base stage of described triode Q2 is connected with pull-up resistor R2.
further, described low-pass filter circuit comprises the resistance R 7 that inverting input passes through to be connected successively, the operational amplifier T2 that resistance R 6 and resistance R 5 are connected with the inverting input of operational amplifier T1, the operational amplifier T3 that inverting input is connected with the output of operational amplifier T2 by connected successively resistance R 9 and resistance R 8, be connected in inverting input and the capacitor C between ground 3 of operational amplifier T2, be connected in inverting input and the capacitor C between ground 5 of operational amplifier T3, the output of described operational amplifier T2 is connected with in-phase input end, the output of described operational amplifier T3 is connected with in-phase input end, the base stage of described triode Q3 is connected with the output of operational amplifier T3.
In the utility model, described low-pass filter circuit also comprises the capacitor C 4 that capacitor C 2, one ends are connected between resistance R 8 and resistance R 9, the other end is connected with the output of operational amplifier T3 that an end is connected between resistance R 6 and resistance R 7, the other end is connected with the output of operational amplifier T2.
Further, described signal amplification circuit also comprises emitter and the resistance R between ground 11 that is connected in triode Q3, is connected in base stage and the resistance R between ground 10 of triode Q3.
Compared with prior art, the utlity model has following beneficial effect:
(1) the utility model is designed to one by audio signal sample circuit, filter circuit, detecting circuit, signal amplification circuit, and has selected the components and parts that cost is minimum, effect is best to carry out circuit design according to actual conditions, accords with the demands of the market.
(2) the utility model is simple in structure, uses less components and parts to realize anti-interference function, and with low cost, volume is small and exquisite, and cost performance is higher, is suitable for large-scale promotion application.
(3) in the utility model, adopt dual low-pass filter circuit, greatly improved the antijamming capability of circuit, improved the stability of work.
The accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples, and execution mode of the present utility model includes but not limited to the following example.
Embodiment
not high in order to solve the audio frequency amplifier cost performance that exists in prior art, the problem that is unfavorable for some mini-plant uses cheaply, as shown in Figure 1, the utility model discloses a kind of noise reducing type amplifier circuit for sound frequency signal, comprise the audio signal sample circuit, inverting input is connected with the output of audio signal sample circuit by resistance R 4, and the operational amplifier T1 that output is connected with the output of audio signal sample circuit by diode D1, and the low-pass filter circuit that is connected with the inverting input of operational amplifier T1, the signal amplification circuit that input is connected with low-pass filter circuit, the output of described operational amplifier T1 is connected by diode D2 with inverting input, described signal amplification circuit comprises the triode Q3 that base stage is connected with the output of low-pass filter circuit, the operational amplifier T4 that is connected with the emitter of triode Q3 by electrochemical capacitor C6, be connected in inverting input and the capacitor C between output 7 of operational amplifier T4, the circuit U 1 in parallel with capacitor C 7, described circuit U 1 is by the capacitor C 8 of mutual series connection, resistance R 14 forms.Wherein, resistance R 4, diode D1, diode D2, operational amplifier T1 have formed detecting circuit.
Specifically, described audio signal sample circuit comprises triode Q1, the triode Q2 that base stage is connected with the collector electrode of triode Q1, between the collector electrode that is connected in triode Q2 and ground and capacitor C 1 and the resistance R 3 of mutually connecting, be connected in the base stage of triode Q1 and the buzzing sheet U between ground, described resistance R 4 one ends are connected with the collector electrode of triode Q2, the other end is connected with the inverting input of operational amplifier T1, and described diode D1 mono-end is connected with the collector electrode of triode Q2, the other end is connected with the output of operational amplifier T1.
In order to improve whole structure, the base stage of described triode Q1 is connected with pull-up resistor R1, and the base stage of described triode Q2 is connected with pull-up resistor R2.
further, described low-pass filter circuit comprises the resistance R 7 that inverting input passes through to be connected successively, the operational amplifier T2 that resistance R 6 and resistance R 5 are connected with the inverting input of operational amplifier T1, the operational amplifier T3 that inverting input is connected with the output of operational amplifier T2 by connected successively resistance R 9 and resistance R 8, be connected in inverting input and the capacitor C between ground 3 of operational amplifier T2, be connected in inverting input and the capacitor C between ground 5 of operational amplifier T3, the output of described operational amplifier T2 is connected with in-phase input end, the output of described operational amplifier T3 is connected with in-phase input end, the base stage of described triode Q3 is connected with the output of operational amplifier T3.
In the utility model, described low-pass filter circuit also comprises the capacitor C 4 that capacitor C 2, one ends are connected between resistance R 8 and resistance R 9, the other end is connected with the output of operational amplifier T3 that an end is connected between resistance R 6 and resistance R 7, the other end is connected with the output of operational amplifier T2.
Further, described signal amplification circuit also comprises emitter and the resistance R between ground 11 that is connected in triode Q3, is connected in base stage and the resistance R between ground 10 of triode Q3.
On the basis of foregoing circuit, the present embodiment also is connected with part auxiliary element and line, and be used to guaranteeing the normal operation of circuit, the use of these auxiliary elements and line belongs to the circuit application custom of industry universal, does not repeat them here.
According to above-described embodiment, just can realize well the utility model.
Claims (6)
1. noise reducing type amplifier circuit for sound frequency signal, it is characterized in that, comprise the audio signal sample circuit, inverting input is connected with the output of audio signal sample circuit by resistance R 4, and the operational amplifier T1 that output is connected with the output of audio signal sample circuit by diode D1, and the low-pass filter circuit that is connected with the inverting input of operational amplifier T1, the signal amplification circuit that input is connected with low-pass filter circuit, the output of described operational amplifier T1 is connected by diode D2 with inverting input, described signal amplification circuit comprises the triode Q3 that base stage is connected with the output of low-pass filter circuit, the operational amplifier T4 that is connected with the emitter of triode Q3 by electrochemical capacitor C6, be connected in inverting input and the capacitor C between output 7 of operational amplifier T4, the circuit U 1 in parallel with capacitor C 7, described circuit U 1 is by the capacitor C 8 of mutual series connection, resistance R 14 forms.
2. noise reducing type amplifier circuit for sound frequency signal according to claim 1, it is characterized in that, described audio signal sample circuit comprises triode Q1, the triode Q2 that base stage is connected with the collector electrode of triode Q1, be connected between the collector electrode and ground of triode Q2, and capacitor C 1 and the resistance R 3 of mutually connecting, be connected in the base stage of triode Q1 and the buzzing sheet U between ground, described resistance R 4 one ends are connected with the collector electrode of triode Q2, the other end is connected with the inverting input of operational amplifier T1, described diode D1 mono-end is connected with the collector electrode of triode Q2, the other end is connected with the output of operational amplifier T1.
3. noise reducing type amplifier circuit for sound frequency signal according to claim 2, is characterized in that, the base stage of described triode Q1 is connected with pull-up resistor R1, and the base stage of described triode Q2 is connected with pull-up resistor R2.
4. noise reducing type amplifier circuit for sound frequency signal according to claim 3, it is characterized in that, described low-pass filter circuit comprises the resistance R 7 that inverting input passes through to be connected successively, the operational amplifier T2 that resistance R 6 and resistance R 5 are connected with the inverting input of operational amplifier T1, the operational amplifier T3 that inverting input is connected with the output of operational amplifier T2 by connected successively resistance R 9 and resistance R 8, be connected in inverting input and the capacitor C between ground 3 of operational amplifier T2, be connected in inverting input and the capacitor C between ground 5 of operational amplifier T3, the output of described operational amplifier T2 is connected with in-phase input end, the output of described operational amplifier T3 is connected with in-phase input end, the base stage of described triode Q3 is connected with the output of operational amplifier T3.
5. noise reducing type amplifier circuit for sound frequency signal according to claim 4, it is characterized in that, described low-pass filter circuit also comprises the capacitor C 4 that capacitor C 2, one ends are connected between resistance R 8 and resistance R 9, the other end is connected with the output of operational amplifier T3 that an end is connected between resistance R 6 and resistance R 7, the other end is connected with the output of operational amplifier T2.
6. noise reducing type amplifier circuit for sound frequency signal according to claim 5, is characterized in that, described signal amplification circuit also comprises emitter and the resistance R between ground 11 that is connected in triode Q3, is connected in base stage and the resistance R between ground 10 of triode Q3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203552601U CN203301424U (en) | 2013-06-20 | 2013-06-20 | Noise-reducing type audio signal amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203552601U CN203301424U (en) | 2013-06-20 | 2013-06-20 | Noise-reducing type audio signal amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203301424U true CN203301424U (en) | 2013-11-20 |
Family
ID=49577404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203552601U Expired - Lifetime CN203301424U (en) | 2013-06-20 | 2013-06-20 | Noise-reducing type audio signal amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203301424U (en) |
-
2013
- 2013-06-20 CN CN2013203552601U patent/CN203301424U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHENGDU BOST INFORMATION TECHNOLOGY CO., LTD. Free format text: FORMER NAME: CHENGDU BOOST TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 610000, Sichuan, Chengdu province Wuhou District Wu Qing Road (Wuhou hi tech Innovation Center incubator) Patentee after: CHENGDU BOOST INFORMATION TECHNOLOGY Co.,Ltd. Address before: 610000, Sichuan, Chengdu province Wuhou District Wu Qing Road (Wuhou hi tech Innovation Center incubator) Patentee before: CHENGDU BOOST TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20131120 |
|
| CX01 | Expiry of patent term |