CN203057473U - Active audio frequency amplifying circuit - Google Patents
Active audio frequency amplifying circuit Download PDFInfo
- Publication number
- CN203057473U CN203057473U CN 201320001086 CN201320001086U CN203057473U CN 203057473 U CN203057473 U CN 203057473U CN 201320001086 CN201320001086 CN 201320001086 CN 201320001086 U CN201320001086 U CN 201320001086U CN 203057473 U CN203057473 U CN 203057473U
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- resistance
- operational amplifier
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- audio frequency
- triode
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Abstract
The utility model discloses an active audio frequency amplifying circuit, and mainly solves problems of an audio frequency amplifying circuit in the prior art that no power circuit is provided, structure is complex and cost is high. The active audio frequency amplifying circuit comprises an in series negative feedback stabilized power supply circuit, an operational amplifier T1 with a non-inverting input terminal connected with the in series negative feedback stabilized power supply circuit 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 scheme, the active audio frequency amplifying circuit obtains a purpose of amplifying the active audio frequency, is low in cost and small in size, and has very high practical value and promotion value.
Description
Technical field
The utility model relates to a kind of loudspeaker 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 bigger, 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 the prior art, and volume is bigger, the cost problem of higher.
To achieve these goals, the technical solution adopted in the utility model is as follows:
The active audio frequency amplifying circuit, comprise series connection negative feedback voltage-stabilized power supply circuit, also comprise the operational amplifier T1 that resistance R 7, capacitor C 3 and resistance R 8 that in-phase input end passes through to link to each other successively link to each other with series connection negative feedback voltage-stabilized power supply circuit, output passes through the operational amplifier T2 that loudspeaker U2 links to each other with the output of operational amplifier T1.
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, the input of this resistance R 6 links to each other with resistance R 7, and its output links to each other with the in-phase input end of operational amplifier T1 by capacitor C 1.
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 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 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 series connection negative feedback voltage-stabilized power supply circuit, also comprise the operational amplifier T1 that resistance R 7, capacitor C 3 and resistance R 8 that in-phase input end passes through to link to each other successively link to each other with series connection negative feedback voltage-stabilized power supply circuit, output passes through the operational amplifier T2 that loudspeaker U2 links to each other with the output of operational amplifier T1.
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, the input of this resistance R 6 links to each other with resistance R 7, and its output links to each other with the in-phase input end of operational amplifier T1 by capacitor C 1.
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. active audio frequency amplifying circuit, comprise series connection negative feedback voltage-stabilized power supply circuit, it is characterized in that, also comprise the operational amplifier T1 that resistance R 7, capacitor C 3 and resistance R 8 that in-phase input end passes through to link to each other successively link to each other with series connection negative feedback voltage-stabilized power supply circuit, output passes through the operational amplifier T2 that loudspeaker U2 links to each other with the output of operational amplifier T1.
2. active audio frequency amplifying circuit 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, the input of this resistance R 6 links to each other with resistance R 7, and its output links to each other with the in-phase input end of operational amplifier T1 by capacitor C 1.
3. active audio frequency amplifying circuit 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 201320001086 CN203057473U (en) | 2013-01-05 | 2013-01-05 | Active audio frequency amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320001086 CN203057473U (en) | 2013-01-05 | 2013-01-05 | Active audio frequency amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203057473U true CN203057473U (en) | 2013-07-10 |
Family
ID=48740386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320001086 Expired - Fee Related CN203057473U (en) | 2013-01-05 | 2013-01-05 | Active audio frequency amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203057473U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475977A (en) * | 2013-09-10 | 2013-12-25 | 昆山新金福精密电子有限公司 | Audio signal circuit |
-
2013
- 2013-01-05 CN CN 201320001086 patent/CN203057473U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475977A (en) * | 2013-09-10 | 2013-12-25 | 昆山新金福精密电子有限公司 | Audio signal circuit |
| CN103475977B (en) * | 2013-09-10 | 2016-05-18 | 昆山龙仕达电子材料有限公司 | A kind of audio signal circuit |
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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 |