CN203027452U - Filtering type active sounding device - Google Patents
Filtering type active sounding device Download PDFInfo
- Publication number
- CN203027452U CN203027452U CN 201220648353 CN201220648353U CN203027452U CN 203027452 U CN203027452 U CN 203027452U CN 201220648353 CN201220648353 CN 201220648353 CN 201220648353 U CN201220648353 U CN 201220648353U CN 203027452 U CN203027452 U CN 203027452U
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- triode
- filtering type
- inductance
- emitter
- operational amplifier
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Abstract
The utility model discloses a filtering type active sounding device 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 and a filtering circuit, the structure is complicated, and the cost is high. The filtering type active sounding device comprises a triode Q1, a triode Q2, a resistor R2, a pickup U1, an operational amplifier T1, a T type filtering circuit 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, the T type filtering circuit is connected with an output terminal of the operational amplifier T1, and the loudspeaker U2 is connected with an output terminal of the T type filtering circuit. Through the scheme, the filtering type active sounding device 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 pronunciation device, specifically, relates to the active pronunciation device of filtering type.
Background technology
Pronunciation device is the equipment that will use in a lot of audio-visual devices, yet present pronunciation device does not mostly have power circuit and filter circuit, need to connect in addition independent current source, and interference is larger, 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 filtering type active pronunciation device, mainly solve the audio amplifier circuit passing circuit and the filter circuit that exist 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:
The active pronunciation device of filtering type, 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 T-shaped filter circuit that is connected with the output of operational amplifier T1, the loudspeaker U2 that is connected with T-shaped filter circuit output.
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 is connected with its output by inductance L 2, inductance L 3, the diode D1 that is connected successively; Described T-shaped filter circuit comprises the variable inductance L that is connected in diode D1 two ends, the rectification circuit U3 that is consisted of by four diodes that is connected with variable inductance L, the inductance L 4, the electrochemical capacitor C1 that all are in parallel with rectification circuit U3, capacitor C 2, described loudspeaker are connected in the input of capacitor C 2.
Compared with prior art, the utlity model has following beneficial effect:
(1) the utility model is designed to one with power circuit, filter 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 the active pronunciation device of filtering type, 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 the active pronunciation device of filtering type, 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 T-shaped filter circuit that is connected with the output of operational amplifier T1, the loudspeaker U2 that is connected with T-shaped filter circuit output.
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 is connected with its output by inductance L 2, inductance L 3, the diode D1 that is connected successively; Described T-shaped filter circuit comprises the variable inductance L that is connected in diode D1 two ends, the rectification circuit U3 that is consisted of by four diodes that is connected with variable inductance L, the inductance L 4, the electrochemical capacitor C1 that all are in parallel with rectification circuit U3, capacitor C 2, described loudspeaker are connected in the input of capacitor C 2.
According to above-described embodiment, just can realize well the utility model.
Claims (5)
1. the active pronunciation device of filtering type, 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 T-shaped filter circuit that is connected with the output of operational amplifier T1, the loudspeaker U2 that is connected with T-shaped filter circuit output.
2. the active pronunciation device of filtering type 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. the active pronunciation device of filtering type 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. the active pronunciation device of filtering type according to claim 3, is characterized in that, the inverting input of described operational amplifier T1 is connected with its output by inductance L 2, inductance L 3, the diode D1 that is connected successively.
5. the active pronunciation device of filtering type according to claim 4, it is characterized in that, described T-shaped filter circuit comprises the variable inductance L that is connected in diode D1 two ends, the rectification circuit U3 that is consisted of by four diodes that is connected with variable inductance L, the inductance L 4, the electrochemical capacitor C1 that all are in parallel with rectification circuit U3, capacitor C 2, described loudspeaker are connected in the input of capacitor C 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220648353 CN203027452U (en) | 2012-11-30 | 2012-11-30 | Filtering type active sounding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220648353 CN203027452U (en) | 2012-11-30 | 2012-11-30 | Filtering type active sounding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203027452U true CN203027452U (en) | 2013-06-26 |
Family
ID=48651393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220648353 Expired - Fee Related CN203027452U (en) | 2012-11-30 | 2012-11-30 | Filtering type active sounding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203027452U (en) |
-
2012
- 2012-11-30 CN CN 201220648353 patent/CN203027452U/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 |