CN203027451U - Active audio amplifying circuit - Google Patents
Active audio amplifying circuit Download PDFInfo
- Publication number
- CN203027451U CN203027451U CN 201220647974 CN201220647974U CN203027451U CN 203027451 U CN203027451 U CN 203027451U CN 201220647974 CN201220647974 CN 201220647974 CN 201220647974 U CN201220647974 U CN 201220647974U CN 203027451 U CN203027451 U CN 203027451U
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- CN
- China
- Prior art keywords
- triode
- amplifying circuit
- active audio
- emitter
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses an active audio amplifying circuit which is mainly used for solving the problems in the prior art that an audio amplifying circuit is not provided with a power supply circuit, the structure is complicated, and the cost is high. The active audio amplifying circuit comprises a triode Q1, a triode Q2, a resistor R2, a pickup U1, an operational amplifier T1 and a loudspeaker U2, wherein the collector electrode of the triode Q2 is connected with the base electrode of the triode Q1, the resistor R2 is connected between the emitter electrode of the triode Q1 and the emitter electrode of the triode Q2, the pickup U1 is connected with the emitter electrode of the triode Q1, an in-phase input terminal of the operational amplifier T1 is connected with the pickup U1 through an inductor L1, and the loudspeaker U2 is connected with an output terminal of the operational amplifier T1. Through the scheme, the active audio amplifying circuit achieves the aim of being capable of carrying out active audio amplification, is low in cost and small in size and has high practical and promotional values.
Description
Technical field
The utility model relates to a kind of voicefrequency circuit, specifically, relates to a kind of active audio frequency amplifying circuit.
Background technology
Audio amplifier circuit is the circuit that will use in a lot of audio-visual devices, yet present audio-visual devices does not mostly have power circuit, need to connect in addition independent current source, and volume is larger, and cost is higher, is not easy to use.
The utility model content
The purpose of this utility model is to provide a kind of active audio frequency amplifying circuit, mainly solve the audio amplifier circuit passing circuit that exists in prior art, and volume is larger, the problem that cost is higher.
To achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of active audio frequency amplifying circuit, comprise triode Q1, the triode Q2 that collector electrode is connected with the base stage of triode Q1, be connected in the resistance R 2 between the emitter of the emitter of triode Q1 and triode Q2, the pick-up U1 that is connected with the emitter of triode Q1, the operational amplifier T1 that in-phase input end is connected with pick-up U1 by inductance L 1, the loudspeaker U2 that is connected with the output of operational amplifier T1.
Specifically, the collector electrode of described triode Q1 is connected with the collector electrode of triode Q2 by resistance R 1; The base stage of described triode Q2 is connected with variable resistor R4, described variable resistor R4 one end by resistance R 3 be connected with the emitter of triode Q1, the other end passes through resistance R 5 and is connected with the emitter of triode Q2; The inverting input of described operational amplifier T1 by inductance L 2 be connected to the ground, output is connected to the ground by diode D1 and the inductance L 3 that is connected successively.
Compared with prior art, the utlity model has following beneficial effect:
(1) the utility model is designed to one with power circuit and audio power amplifying 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 a kind of active audio frequency amplifying circuit, and with low cost, volume is small and exquisite, is fit to large-scale promotion application.
Description of drawings
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
As shown in Figure 1, the utility model discloses a kind of active audio frequency amplifying circuit, comprise triode Q1, the triode Q2 that collector electrode is connected with the base stage of triode Q1, be connected in the resistance R 2 between the emitter of the emitter of triode Q1 and triode Q2, with the pick-up U1 that the emitter of triode Q1 is connected, the operational amplifier T1 that in-phase input end is connected with pick-up U1 by inductance L 1, the loudspeaker U2 that is connected with the output of operational amplifier T1.
Specifically, the collector electrode of described triode Q1 is connected with the collector electrode of triode Q2 by resistance R 1; The base stage of described triode Q2 is connected with variable resistor R4, described variable resistor R4 one end by resistance R 3 be connected with the emitter of triode Q1, the other end passes through resistance R 5 and is connected with the emitter of triode Q2; The inverting input of described operational amplifier T1 by inductance L 2 be connected to the ground, output is connected to the ground by diode D1 and the inductance L 3 that is connected successively.
According to above-described embodiment, just can realize well the utility model.
Claims (4)
1. active audio frequency amplifying circuit, it is characterized in that, comprise triode Q1, the triode Q2 that collector electrode is connected with the base stage of triode Q1, be connected in the resistance R 2 between the emitter of the emitter of triode Q1 and triode Q2, with the pick-up U1 that the emitter of triode Q1 is connected, the operational amplifier T1 that in-phase input end is connected with pick-up U1 by inductance L 1, the loudspeaker U2 that is connected with the output of operational amplifier T1.
2. a kind of active audio frequency amplifying circuit according to claim 1, is characterized in that, the collector electrode of described triode Q1 is connected with the collector electrode of triode Q2 by resistance R 1.
3. a kind of active audio frequency amplifying circuit according to claim 2, it is characterized in that, the base stage of described triode Q2 is connected with variable resistor R4, described variable resistor R4 one end by resistance R 3 be connected with the emitter of triode Q1, the other end passes through resistance R 5 and is connected with the emitter of triode Q2.
4. a kind of active audio frequency amplifying circuit according to claim 3, is characterized in that, the inverting input of described operational amplifier T1 by inductance L 2 be connected to the ground, output is connected to the ground by diode D1 and the inductance L 3 that is connected successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220647974 CN203027451U (en) | 2012-11-30 | 2012-11-30 | Active audio amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220647974 CN203027451U (en) | 2012-11-30 | 2012-11-30 | Active audio amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203027451U true CN203027451U (en) | 2013-06-26 |
Family
ID=48651392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220647974 Expired - Fee Related CN203027451U (en) | 2012-11-30 | 2012-11-30 | Active audio amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203027451U (en) |
-
2012
- 2012-11-30 CN CN 201220647974 patent/CN203027451U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130626 Termination date: 20131130 |