CN204697017U - A kind of intercom audio amplifier circuit - Google Patents
A kind of intercom audio amplifier circuit Download PDFInfo
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- CN204697017U CN204697017U CN201520554312.7U CN201520554312U CN204697017U CN 204697017 U CN204697017 U CN 204697017U CN 201520554312 U CN201520554312 U CN 201520554312U CN 204697017 U CN204697017 U CN 204697017U
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- triode
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Abstract
The utility model discloses a kind of intercom audio amplifier circuit, comprise resistance R1, electric capacity C1, triode V3 and loud speaker B, one end of described electric capacity C1 connects input audio signal IN, the other end contact resistance R1 of electric capacity C1 and the base stage of triode V1, the emitter contact resistance R4 of triode V1 and the emitter of triode V2, collector electrode contact resistance R2, the electric capacity C5 of triode V1 and the base stage of triode V3.The utility model intercom audio amplifier circuit structure is simple, components and parts are few, abandon complicated chip structure, only use the combination into this electronic component, realize the audio frequency enlarging function of intercom, and can also high-frequency self-excitation be suppressed, therefore have that cost of manufacture is low, volume is little, the advantage of strong interference immunity.
Description
Technical field
The utility model relates to a kind of interphone circuit, specifically a kind of intercom audio amplifier circuit.
Background technology
Intercom is as a kind of outstanding Wireless Telecom Equipment, inner amplifier is absolutely necessary, in order to realize noise reduction and the power output improving intercom etc. the reason of intercom, amplifier circuit configuration of the prior art is complicated, employing electronic component is many, external volume large, thus affects the development of Modern Small equipment.
Utility model content
The purpose of this utility model is the intercom audio amplifier circuit providing a kind of volume little, effective, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of intercom audio amplifier circuit, comprise resistance R1, electric capacity C1, triode V3 and loud speaker B, one end of described electric capacity C1 connects input audio signal IN, the other end contact resistance R1 of electric capacity C1 and the base stage of triode V1, the emitter contact resistance R4 of triode V1 and the emitter of triode V2, the collector electrode contact resistance R2 of triode V1, the base stage of electric capacity C5 and triode V3, the other end of the other end contact resistance R2 of resistance R1, resistance R3, resistance R10, resistance R13, electric capacity C3, the emitter of loudspeaker B and triode V3, the other end of the collector electrode contact resistance R3 of triode V2, the emitter of the emitter connecting triode V2 of triode V1 and resistance R4, the other end of resistance R4 connects electric capacity C2 and resistance R5, the other end ground connection of electric capacity C2, the other end contact resistance R8 of resistance R5, the collector electrode of triode V6, the collector electrode of triode V7 and power supply VCC, the other end contact resistance R9 of resistance R8 and electric capacity C6, the base stage of triode V2 connects electric capacity C4, resistance R6 and resistance R7, the other end of resistance R6 connects the other end of electric capacity C3, the other end contact resistance R7 of electric capacity C4, resistance R11, resistance R12, resistance R14, the other end of electric capacity C6 and electric capacity C7, the other end of electric capacity C5 connects the negative electrode of diode D1, the base stage of the base stage connecting triode V4 of triode V1, the other end of resistance R9 connects the anode of diode D1 and the base stage of triode V6, the other end of emitter contact resistance R11 of triode V6 and the base stage of triode V7, the other end of the emitter contact resistance R14 of triode V7, the other end of the emitter contact resistance R12 of triode V4, the other end of the emitter contact resistance R10 of triode V5, the other end of electric capacity C7 connects the other end of loudspeaker B.
As preferred version of the present utility model: described power supply VCC is 9V direct current.
Compared with prior art, the beneficial effects of the utility model are: the utility model intercom audio amplifier circuit structure is simple, components and parts are few, abandon complicated chip structure, only use the combination into this electronic component, realize the audio frequency enlarging function of intercom, and can also high-frequency self-excitation be suppressed, therefore have that cost of manufacture is low, volume is little, the advantage of strong interference immunity.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of intercom audio amplifier circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of intercom audio amplifier circuit, comprise resistance R1, electric capacity C1, triode V3 and loud speaker B, one end of described electric capacity C1 connects input audio signal IN, the other end contact resistance R1 of electric capacity C1 and the base stage of triode V1, the emitter contact resistance R4 of triode V1 and the emitter of triode V2, the collector electrode contact resistance R2 of triode V1, the base stage of electric capacity C5 and triode V3, the other end of the other end contact resistance R2 of resistance R1, resistance R3, resistance R10, resistance R13, electric capacity C3, the emitter of loudspeaker B and triode V3, the other end of the collector electrode contact resistance R3 of triode V2, the emitter of the emitter connecting triode V2 of triode V1 and resistance R4, the other end of resistance R4 connects electric capacity C2 and resistance R5, the other end ground connection of electric capacity C2, the other end contact resistance R8 of resistance R5, the collector electrode of triode V6, the collector electrode of triode V7 and power supply VCC, the other end contact resistance R9 of resistance R8 and electric capacity C6, the base stage of triode V2 connects electric capacity C4, resistance R6 and resistance R7, the other end of resistance R6 connects the other end of electric capacity C3, the other end contact resistance R7 of electric capacity C4, resistance R11, resistance R12, resistance R14, the other end of electric capacity C6 and electric capacity C7, the other end of electric capacity C5 connects the negative electrode of diode D1, the base stage of the base stage connecting triode V4 of triode V1, the other end of resistance R9 connects the anode of diode D1 and the base stage of triode V6, the other end of emitter contact resistance R11 of triode V6 and the base stage of triode V7, the other end of the emitter contact resistance R14 of triode V7, the other end of the emitter contact resistance R12 of triode V4, the other end of the emitter contact resistance R10 of triode V5, the other end of electric capacity C7 connects the other end of loudspeaker B.
Power supply VCC is 9V direct current.
Operation principle of the present utility model is: in circuit, and V1, V2 form differential input level voltage amplifier, and V3 promotes pipe, and diode D1 is the quiescent biasing diode of power amplification efferent duct, and V4 ~ V7 forms compound mutual symmetry formula circuit, is output-stage circuit.Wherein V6 and V7 is two NPN type same polarity multiple tubes, and equivalence becomes a NPN transistor, V4 and V5 is positive-negative-positive and NPN type multiple tube respectively, and equivalence becomes a PNP transistor.Input signal IN is added to the base stage of V1 pipe through coupling capacitor C1, exports, be directly coupled to the base stage of V3 pipe, export after amplification from its collector electrode after amplifying from its collector electrode.The positive half-cycle signal that V3 pipe collector exports amplifies through V6 and V7, be coupled in loud speaker B by C7, the negative half-cycle signal that V3 pipe collector exports amplifies through V4 and V5, is also coupled in loud speaker B by C7, and loud speaker B obtains a complete signal positive and negative half Monday.V1 and V2 pipe forms single ended input, Single-end output formula differential circuit, is voltage order one amplifier.The base bias current of V1 pipe is provided by R1, and the base bias current of V2 pipe is provided by R7, and the right-hand member of R7 connects output, and the base voltage promoting level V3 pipe takes from the collector electrode of V1 pipe, adopts direct coupling system between super the two poles of the earth.C5 is the high frequency voltage Shunt negative feedback formula resonant capacitor of V3, and its capacitance is less, opens a way in audio signal, very little for high-frequency signal capacitive reactance, and has large negative feedback, the high-frequency self-excitation that may occur with rejective amplifier.
Claims (2)
1. an intercom audio amplifier circuit, comprise resistance R1, electric capacity C1, triode V3 and loud speaker B, it is characterized in that, one end of described electric capacity C1 connects input audio signal IN, the other end contact resistance R1 of electric capacity C1 and the base stage of triode V1, the emitter contact resistance R4 of triode V1 and the emitter of triode V2, the collector electrode contact resistance R2 of triode V1, the base stage of electric capacity C5 and triode V3, the other end of the other end contact resistance R2 of resistance R1, resistance R3, resistance R10, resistance R13, electric capacity C3, the emitter of loudspeaker B and triode V3, the other end of the collector electrode contact resistance R3 of triode V2, the emitter of the emitter connecting triode V2 of triode V1 and resistance R4, the other end of resistance R4 connects electric capacity C2 and resistance R5, the other end ground connection of electric capacity C2, the other end contact resistance R8 of resistance R5, the collector electrode of triode V6, the collector electrode of triode V7 and power supply VCC, the other end contact resistance R9 of resistance R8 and electric capacity C6, the base stage of triode V2 connects electric capacity C4, resistance R6 and resistance R7, the other end of resistance R6 connects the other end of electric capacity C3, the other end contact resistance R7 of electric capacity C4, resistance R11, resistance R12, resistance R14, the other end of electric capacity C6 and electric capacity C7, the other end of electric capacity C5 connects the negative electrode of diode D1, the base stage of the base stage connecting triode V4 of triode V1, the other end of resistance R9 connects the anode of diode D1 and the base stage of triode V6, the other end of emitter contact resistance R11 of triode V6 and the base stage of triode V7, the other end of the emitter contact resistance R14 of triode V7, the other end of the emitter contact resistance R12 of triode V4, the other end of the emitter contact resistance R10 of triode V5, the other end of electric capacity C7 connects the other end of loudspeaker B.
2. a kind of intercom audio amplifier circuit according to claim 1, is characterized in that, described power supply VCC is 9V direct current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520554312.7U CN204697017U (en) | 2015-07-29 | 2015-07-29 | A kind of intercom audio amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520554312.7U CN204697017U (en) | 2015-07-29 | 2015-07-29 | A kind of intercom audio amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204697017U true CN204697017U (en) | 2015-10-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520554312.7U Expired - Fee Related CN204697017U (en) | 2015-07-29 | 2015-07-29 | A kind of intercom audio amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204697017U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612107A (en) * | 2016-12-27 | 2017-05-03 | 郑州诚合信息技术有限公司 | Computer built-in audio amplifier circuit |
-
2015
- 2015-07-29 CN CN201520554312.7U patent/CN204697017U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612107A (en) * | 2016-12-27 | 2017-05-03 | 郑州诚合信息技术有限公司 | Computer built-in audio amplifier circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151007 Termination date: 20160729 |