CN201845251U - Novel audio constant-current output circuit - Google Patents
Novel audio constant-current output circuit Download PDFInfo
- Publication number
- CN201845251U CN201845251U CN2009202236403U CN200920223640U CN201845251U CN 201845251 U CN201845251 U CN 201845251U CN 2009202236403 U CN2009202236403 U CN 2009202236403U CN 200920223640 U CN200920223640 U CN 200920223640U CN 201845251 U CN201845251 U CN 201845251U
- Authority
- CN
- China
- Prior art keywords
- unit
- current
- output
- current output
- power 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
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a novel audio constant-current output circuit, which comprises an RR (Radio Receiver) unit, a back-stage power amplifier and a signal amplifying triode. The utility model can ensure that the constant set current can be output under the condition that the loading has a large change range, and can be used in electronic equipment with the requirement that alternative current is output to be constant-current, such as audio electrotherapy instruments, and the like. The audio constant-current output circuit has a simple structure, a low cost, reliable property and the like, and is suitable for the electronic equipment with the requirement that alternative current is output to be the constant-current, such as audio electrotherapy instruments and the like.
Description
Affiliated technical field:
The utility model relates to a kind of audio frequency constant current output circuit, is usually used in equipment such as audio treatment.
Background technology:
Common audio output circuit design is unreasonable, when output load changes, can not provide stable output current.
Summary of the invention:
In order thoroughly to solve the deficiency that existing audio output circuit can not provide stable output current, the utility model provides a kind of audio frequency constant current output circuit, this audio frequency constant current output circuit is can not only outputting current steadily reliable, and has high-technology index, high reliability.
Signal input part connects the base stage of signal amplifying triode, the emitter-base bandgap grading of signal amplifying triode connects the RR unit, RR unit output terminal connects the constant current output terminal, the RR unit is connected with final-stage power amplifier by earth terminal, the collector of signal amplifying triode connects final-stage power amplifier, and final-stage power amplifier is connected to the constant current output terminal.This circuit forms a negative feedback network, when constant current output terminal and RR unit pull-up resistor that output terminal connects diminish, also the phase strain is big for the final-stage power amplifier output current, and this electric current flows through first feedback resistance in the RR unit simultaneously, and on first feedback resistance, produced feedback voltage, this voltage is identical with the base stage input voltage phase of signal amplifying triode, the output of signal amplifying triode collector will reduce, the also corresponding minimizing of final-stage power amplifier output this moment reduces so the final-stage power amplifier output current is also corresponding; Otherwise when constant current output terminal and RR unit pull-up resistor that output terminal connects became big, the final-stage power amplifier output current is also corresponding to diminish, but through this circuit, it is big that the final-stage power amplifier output current will become.So by this circuit, can guarantee that when pull-up resistor changed, output current was constant substantially, thereby realize the effect of constant current output.
The beneficial effects of the utility model are, can realize constant current output, and one-piece construction are simple, and cost is low, dependable performance.
Description of drawings:
Below in conjunction with drawings and Examples the utility model is further specified
Fig. 1 is circuit theory diagrams of the present utility model
Fig. 2 is the circuit theory diagrams of RR unit
1. signal input parts among the figure, 2.RR unit, 3. earth terminal, 4. power input, 5. constant current output terminal, 6. final-stage power amplifier, 7. signal amplifying triode, 8.RR unit feedback end, 9. first feedback resistance, 10. second feedback resistance, 11. earth terminals, 12.RR unit output terminal
Embodiment:
In Fig. 1, signal input part (1) connects the base stage of signal amplifying triode (7), the emitter-base bandgap grading of signal amplifying triode (7) connects RR unit (2), RR unit (2) connects constant current output terminal (5), RR unit (2) is connected with final-stage power amplifier (6) by earth terminal (3), the collector of signal amplifying triode (7) connects final-stage power amplifier (6), and final-stage power amplifier (6) is connected to constant current output terminal (5).
In Fig. 2, RR unit feedback end (8) connects first feedback resistance (9), and first feedback resistance (9) is connected with second feedback resistance (10), and its series connection node is connected to RR unit output terminal (12), and second feedback resistance (10) is connected to earth terminal.
In example illustrated in figures 1 and 2, when constant current output terminal (5) pull-up resistor that connects diminishes, also the phase strain is big for final-stage power amplifier (6) output current, and this electric current flows through first feedback resistance (9) in the RR unit (2) simultaneously, and on first feedback resistance (9), produced feedback voltage, this voltage is identical with the base stage input voltage phase of signal amplifying triode (7), the output of signal amplifying triode (7) collector will reduce, so the also corresponding minimizing of final-stage power amplifier this moment (6) output is also corresponding the reducing of final-stage power amplifier (6) output current.
In example illustrated in figures 1 and 2, when constant current output terminal (5) pull-up resistor that connects becomes big, also corresponding the diminishing of final-stage power amplifier (6) output current, and this electric current flows through first feedback resistance (9) in the RR unit (2) simultaneously, and on first feedback resistance (9), produced feedback voltage, this voltage is opposite with the base stage input voltage phase of signal amplifying triode (7), the output of signal amplifying triode (7) collector will increase, the also corresponding increase of final-stage power amplifier this moment (6) output, so also the phase strain is big for final-stage power amplifier (6) output current, so by this circuit, can guarantee when pull-up resistor changes, output current is constant substantially, thereby realizes the effect of constant current output.
Claims (2)
1. novel audio constant current output circuit, it is characterized in that: signal input part connects the base stage of signal amplifying triode, the emitter-base bandgap grading of signal amplifying triode connects the RR unit, the RR unit connects the constant current output terminal, the RR unit is connected with final-stage power amplifier by earth terminal, the collector of signal amplifying triode connects final-stage power amplifier, and final-stage power amplifier is connected to the constant current output terminal.
2. novel audio constant current output circuit according to claim 1, it is characterized in that: RR unit feedback end connects first feedback resistance, first feedback resistance is connected with second feedback resistance, and its series connection node is connected to RR unit output terminal, and second feedback resistance is connected to earth terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202236403U CN201845251U (en) | 2009-09-22 | 2009-09-22 | Novel audio constant-current output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202236403U CN201845251U (en) | 2009-09-22 | 2009-09-22 | Novel audio constant-current output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201845251U true CN201845251U (en) | 2011-05-25 |
Family
ID=44040138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202236403U Expired - Fee Related CN201845251U (en) | 2009-09-22 | 2009-09-22 | Novel audio constant-current output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201845251U (en) |
-
2009
- 2009-09-22 CN CN2009202236403U patent/CN201845251U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201503689U (en) | Video equipment | |
| CN103457302A (en) | Charge circuit and electronic device with same | |
| CN201845251U (en) | Novel audio constant-current output circuit | |
| CN202068550U (en) | Mute control circuit for power failure | |
| CN202486646U (en) | Constant current circuit | |
| CN102103407B (en) | Input/output device and environment monitoring system with same | |
| CN202331254U (en) | Current-voltage conversion circuit with over-current protection circuit module | |
| CN201606059U (en) | Power supply circuit of microsphere focused logging main current | |
| CN201294487Y (en) | Low noise DC servo circuit | |
| CN103929061A (en) | Constant flow source with single power supply adjustable | |
| CN208479168U (en) | A kind of under-voltage protecting circuit | |
| CN201262716Y (en) | Controllable 4-20mA current output circuit | |
| CN101800481A (en) | Feedback control method of isolating feedback power supply and isolating feedback power supply | |
| CN201666931U (en) | Circuit for aged device screening | |
| CN202276285U (en) | Power supply filter circuit used for stored program control exchange | |
| CN221202155U (en) | Current sharing signal delay sub-circuit and current sharing circuit | |
| CN202150929U (en) | Audio device and audio switching circuit thereof | |
| CN204065896U (en) | A kind of mu balanced circuit | |
| CN204481789U (en) | A kind of digital display meter analogue quantity output circuit | |
| CN202334443U (en) | Amplifier capable of being directly coupled | |
| CN106788296A (en) | Electronic switch power amplifier | |
| CN104111713A (en) | Voltage protection circuit | |
| CN203313128U (en) | Novel infrared amplifying circuit | |
| CN101968753A (en) | Powder down memory circuit | |
| CN114697844B (en) | Microphone circuit, microphone module and microphone sound pressure overload point lifting method |
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: 20110525 Termination date: 20110922 |