CN203057470U - Filtering type active sounding device - Google Patents
Filtering type active sounding device Download PDFInfo
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- CN203057470U CN203057470U CN 201320001069 CN201320001069U CN203057470U CN 203057470 U CN203057470 U CN 203057470U CN 201320001069 CN201320001069 CN 201320001069 CN 201320001069 U CN201320001069 U CN 201320001069U CN 203057470 U CN203057470 U CN 203057470U
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Abstract
The utility model discloses a filtering type active sounding device, and mainly solves problems of an audio frequency amplifying circuit in the prior art that no power circuit and filter circuit is provided, structure is complex, cost is high and sounding effect is poor. The filtering type active sounding device comprises an in series negative feedback stabilized power supply circuit, a variable inductor L connected with an output terminal of the in series negative feedback stabilized power supply circuit, a rectifier circuit U1 connected with the variable inductor L and formed by four diodes, a inductor L1, a capacitor C5 and a capacitor C6 all connected in parallel with the rectifier circuit U1, an operational amplifier T1 with a non-inverting input terminal connected with an input terminal of the capacitor C6 through a resistor R7, a capacitor C3 and a resistor R8 connected in sequence, and an operational amplifier T2 with an output terminal connected with an output terminal of the operational amplifier T1 through a horn U2. Through employing the above scheme, the filtering type active sounding device obtains a purpose of amplifying active audio frequency, is good in anti-interference capability and small in size, and has very high practical value and promotion value.
Description
Technical field
The utility model relates to a kind of pronunciation device, specifically, relates to the active pronunciation device of a kind of filtering type.
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 bigger, and cost is higher, and voice effect is bad, 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 that exists in the prior art, and volume is bigger, and voice effect is bad, the cost problem of higher.
To achieve these goals, the technical solution adopted in the utility model is as follows:
The active pronunciation device of filtering type, comprise series connection negative feedback voltage-stabilized power supply circuit, also comprise the variable inductance L that links to each other with the output of series connection negative feedback voltage-stabilized power supply circuit, the rectification circuit U1 that is constituted by four diodes that links to each other with variable inductance L, equal inductance L 1, capacitor C 5 and capacitor C 6 in parallel with rectification circuit U1, the operational amplifier T1 that in-phase input end links to each other with the input of capacitor C 6 by resistance R 7, capacitor C 3 and the resistance R 8 that links to each other successively, the operational amplifier T2 that output links to each other with the output of operational amplifier T1 by loudspeaker U2.
Specifically, described series connection negative feedback voltage-stabilized power supply circuit comprises triode Q1, the triode Q2 that collector electrode links to each other 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, equal and resistance R 3 of linking to each other successively in parallel with resistance R 2, resistance R 4 and resistance R 5, described resistance R 4 is slide rheostat, two stiff end links to each other with resistance R 5 with resistance R 3 respectively, its sliding end links to each other with the base stage of triode Q2, the described resistance R 3 that links to each other successively, the two ends of resistance R 4 and resistance R 5 also are parallel with resistance R 6, and described variable inductance L is in parallel with resistance R 6.
The inverting input of described operational amplifier T1 links to each other by resistance R 9 with output, the inverting input of described operational amplifier T2 links to each other by resistance R 11 with output, and the inverting input of the inverting input of described operational amplifier T1 and operational amplifier T2 links to each other with resistance R 10 by 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 for use 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 a kind 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 a kind of filtering type, comprise series connection negative feedback voltage-stabilized power supply circuit, also comprise the variable inductance L that links to each other with the output of series connection negative feedback voltage-stabilized power supply circuit, the rectification circuit U1 that is constituted by four diodes that links to each other with variable inductance L, equal inductance L 1 in parallel with rectification circuit U1, capacitor C 5 and capacitor C 6, the resistance R 7 of in-phase input end by linking to each other successively, the operational amplifier T1 that capacitor C 3 and resistance R 8 link to each other with the input of capacitor C 6, the operational amplifier T2 that output links to each other with the output of operational amplifier T1 by loudspeaker U2.
Specifically, described series connection negative feedback voltage-stabilized power supply circuit comprises triode Q1, the triode Q2 that collector electrode links to each other 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, equal and resistance R 3 of linking to each other successively in parallel with resistance R 2, resistance R 4 and resistance R 5, described resistance R 4 is slide rheostat, two stiff end links to each other with resistance R 5 with resistance R 3 respectively, its sliding end links to each other with the base stage of triode Q2, the described resistance R 3 that links to each other successively, the two ends of resistance R 4 and resistance R 5 also are parallel with resistance R 6, and described variable inductance L is in parallel with resistance R 6.
The inverting input of described operational amplifier T1 links to each other by resistance R 9 with output, the inverting input of described operational amplifier T2 links to each other by resistance R 11 with output, and the inverting input of the inverting input of described operational amplifier T1 and operational amplifier T2 links to each other with resistance R 10 by capacitor C 2.
According to above-described embodiment, just can realize the utility model well.
Claims (3)
1. the active pronunciation device of filtering type, comprise series connection negative feedback voltage-stabilized power supply circuit, it is characterized in that, also comprise the variable inductance L that links to each other with the output of series connection negative feedback voltage-stabilized power supply circuit, the rectification circuit U1 that is constituted by four diodes that links to each other with variable inductance L, equal inductance L 1, capacitor C 5 and capacitor C 6 in parallel with rectification circuit U1, the operational amplifier T1 that in-phase input end links to each other with the input of capacitor C 6 by resistance R 7, capacitor C 3 and the resistance R 8 that links to each other successively, the operational amplifier T2 that output links to each other with the output of operational amplifier T1 by loudspeaker U2.
2. the active pronunciation device of filtering type according to claim 1, it is characterized in that, described series connection negative feedback voltage-stabilized power supply circuit comprises triode Q1, the triode Q2 that collector electrode links to each other 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, equal and resistance R 3 of linking to each other successively in parallel with resistance R 2, resistance R 4 and resistance R 5, described resistance R 4 is slide rheostat, two stiff end links to each other with resistance R 5 with resistance R 3 respectively, its sliding end links to each other with the base stage of triode Q2, the described resistance R 3 that links to each other successively, the two ends of resistance R 4 and resistance R 5 also are parallel with resistance R 6, and described variable inductance L is in parallel with resistance R 6.
3. the active pronunciation device of filtering type according to claim 2, it is characterized in that, the inverting input of described operational amplifier T1 links to each other by resistance R 9 with output, the inverting input of described operational amplifier T2 links to each other by resistance R 11 with output, and the inverting input of the inverting input of described operational amplifier T1 and operational amplifier T2 links to each other with resistance R 10 by capacitor C 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320001069 CN203057470U (en) | 2013-01-05 | 2013-01-05 | Filtering type active sounding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320001069 CN203057470U (en) | 2013-01-05 | 2013-01-05 | Filtering type active sounding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203057470U true CN203057470U (en) | 2013-07-10 |
Family
ID=48740383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320001069 Expired - Fee Related CN203057470U (en) | 2013-01-05 | 2013-01-05 | Filtering type active sounding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203057470U (en) |
-
2013
- 2013-01-05 CN CN 201320001069 patent/CN203057470U/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: 20130710 Termination date: 20140105 |