CN111211738B - Level amplifying circuit - Google Patents
Level amplifying circuit Download PDFInfo
- Publication number
- CN111211738B CN111211738B CN202010031461.0A CN202010031461A CN111211738B CN 111211738 B CN111211738 B CN 111211738B CN 202010031461 A CN202010031461 A CN 202010031461A CN 111211738 B CN111211738 B CN 111211738B
- Authority
- CN
- China
- Prior art keywords
- resistor
- triode
- test interface
- capacitor
- circuit
- 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.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention provides a level amplifying circuit which comprises six resistors R1-R6, four capacitors C1-C4, two diodes D1 and D2 and a triode Q1, wherein the perfect combination of a class A amplifier and a voltage doubling rectifier is skillfully utilized, the defect of low gain of the class A amplifier is overcome, and the requirement of signal amplitude is met. The circuit has the advantages of simple circuit, easy debugging, reliable performance and low cost. The frequency spectrum amplifying circuit for the vehicle-mounted sound can be also used for amplifying application scenes of weak signal undistorted in other fields, and has popularization.
Description
Technical Field
The invention relates to the field of vehicle-mounted multimedia circuits, in particular to a level amplifying circuit.
Background
In the vehicle-mounted multimedia player, a plurality of products have a frequency spectrum dynamic display function, and frequency spectrum patterns jump along with the change of music level intensity, so that the dynamic effect is improved. The current L/R analog audio signal output from the USB decoder is a very weak signal, which is insufficient to drive the LCD display screen, and a primary amplifying circuit is needed to be added outside to amplify the weak signal. The current amplifier circuit class A amplifier has low gain, insufficient signal amplitude, difficult debugging and influence on normal use of the circuit. Therefore, it is important to solve the problems of low gain and insufficient signal amplitude of the common amplifying circuit.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a level amplifying circuit which skillfully utilizes the perfect combination of a class A amplifier and a voltage doubling rectifier, overcomes the defect of low gain of the class A amplifier and meets the requirement of signal amplitude. The circuit has the advantages of simple circuit, easy debugging, reliable performance and low cost.
The invention provides a LEVEL amplifying circuit which comprises six resistors R1-R6, four capacitors C1-C4, two diodes D1 and D2 and a triode Q1, wherein one end of the resistor R1 is connected to a positive electrode, the other end of the resistor R1 is connected to a collector of the triode Q1, one end of the resistor C1 is connected between the R1 and a collector of the triode Q1, the other end of the capacitor C1 is connected to an LEVEL input end, the diode D1 is arranged between the capacitor C1 and an LEVEL input end, one end of the diode D2 is arranged between the diode D1 and the capacitor C1, the other end of the diode D2 is grounded, one end of the capacitor C2 is connected between the capacitor C1 and the LEVEL input end, the other end of the resistor R2 is grounded, the resistor R3 is connected in parallel between a base of the triode Q1 and a collector of the triode Q1, one end of the resistor C3 is connected to the base of the triode Q1 and the triode Q4 in series, and the base of the resistor R4 is connected to the signal output end of the triode Q1 in series.
The further improvement is that: the circuit comprises ten test interfaces TP 1-TP 10, wherein the test interface TP1 is arranged between a resistor R1 and an anode, the test interface TP2 is arranged between a resistor R2 and a LEVEL input end, the test interface TP3 is arranged between a capacitor C1 and a diode D1, the test interface TP4 is arranged between an emitter of a triode Q1 and a resistor R6, the test interface TP5 is arranged between the resistor R3 and a collector of the triode Q1, the test interface TP6 is arranged between the resistor R5 and a base of the triode Q1, the test interface TP7 is arranged between the capacitor C4 and the resistor R5, the test interface TP8 is arranged between the resistor R5 and an L signal output end, the test interface TP9 is arranged between the capacitor C3 and the resistor R4, and the test interface TP10 is arranged between the resistor R4 and the R signal output end.
The further improvement is that: the resistance of the resistor R1 is 10KΩ+ -5%, the resistance of the resistor R2 is 4.7KΩ+ -5%, the resistance of the resistor R3 is 470KΩ+ -5%, the resistance of the resistor R4 is 100KΩ+ -5%, the resistance of the resistor R5 is 100KΩ+ -5%, and the resistance of the resistor R6 is 1KΩ+ -5%.
The further improvement is that: the capacitance of the capacitors C1-C4 is 1 mu F, and the voltage is 25V.
The amplitude of L and R signals output by the USB decoding chip is only 30mV, 1KHZ and 0dB sine wave signals are used as input signal sources for testing, and L/R channels are mixed through coupling capacitors C3 and C4 and then sent to the base electrode of a triode Q1. Because the signal is required to be amplified without distortion, the Q1, R1 and R3 composition amplifying circuit is designed into a class A amplifying circuit, but the class A amplifying circuit has high static working point, lower efficiency and limited amplifying quantity. The ac signal can only be amplified by about 20 times, and the amplitude of the signal that can be tested at the output is about 600 mV.
Still, the requirements of the driver chip cannot be met. Therefore, a voltage doubling rectifying circuit is added at the later stage to boost the voltage by 1 time, and the voltage doubling rectifying circuit comprises: the voltage doubling arrangement circuit is composed of C1, D2, D1 and C2, and the amplitude of signals passing through the circuit is about 1200mV, so that the circuit requirement is completely met.
The beneficial effects of the invention are as follows: the perfect combination of the class A amplifier and the voltage doubling rectifier is skillfully utilized, the defect of low gain of the class A amplifier is overcome, and the requirement of signal amplitude is met. The circuit has the advantages of simple circuit, easy debugging, reliable performance and low cost. The frequency spectrum amplifying circuit for the vehicle-mounted sound can be also used for amplifying application scenes of weak signal undistorted in other fields, and has popularization.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The present invention will be further described in detail with reference to the following examples, which are only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, this embodiment provides a LEVEL amplifying circuit, including six resistors R1 to R6, four capacitors C1 to C4, two diodes D1, D2 and a triode Q1, one end of the resistor R1 is connected to the positive electrode, the other end of the resistor R1 is connected to the collector of the triode Q1, one end of the resistor C1 is connected between R1 and the collector of the triode Q1, the other end of the resistor C1 is connected to the LEVEL input terminal, the diode D1 is arranged between the capacitor C1 and the LEVEL input terminal, one end of the diode D2 is arranged between the diode D1 and the capacitor C1, the other end of the diode D2 is grounded, the other end of the capacitor C2 is grounded, one end of the resistor R2 is connected between the capacitor C1 and the LEVEL input terminal, the other end of the resistor R2 is grounded, the resistor R3 is connected in parallel between the base of the triode Q1 and the collector, the base of the resistor C1 is connected to the emitter of the triode Q1 and the triode Q4, and the signal output terminal of the triode Q4 is connected in series after the base of the resistor C1 and the triode Q4 is connected in series. The circuit comprises ten test interfaces TP 1-TP 10, wherein the test interface TP1 is arranged between a resistor R1 and an anode, the test interface TP2 is arranged between a resistor R2 and a LEVEL input end, the test interface TP3 is arranged between a capacitor C1 and a diode D1, the test interface TP4 is arranged between an emitter of a triode Q1 and a resistor R6, the test interface TP5 is arranged between the resistor R3 and a collector of the triode Q1, the test interface TP6 is arranged between the resistor R5 and a base of the triode Q1, the test interface TP7 is arranged between the capacitor C4 and the resistor R5, the test interface TP8 is arranged between the resistor R5 and an L signal output end, the test interface TP9 is arranged between the capacitor C3 and the resistor R4, and the test interface TP10 is arranged between the resistor R4 and the R signal output end. The resistance of the resistor R1 is 10KΩ+ -5%, the resistance of the resistor R2 is 4.7KΩ+ -5%, the resistance of the resistor R3 is 470KΩ+ -5%, the resistance of the resistor R4 is 100KΩ+ -5%, the resistance of the resistor R5 is 100KΩ+ -5%, and the resistance of the resistor R6 is 1KΩ+ -5%. The capacitance of the capacitors C1-C4 is 1 mu F, and the voltage is 25V. The perfect combination of the class A amplifier and the voltage doubling rectifier is skillfully utilized, the defect of low gain of the class A amplifier is overcome, and the requirement of signal amplitude is met. The circuit has the advantages of simple circuit, easy debugging, reliable performance and low cost. The frequency spectrum amplifying circuit for the vehicle-mounted sound can be also used for amplifying application scenes of weak signal undistorted in other fields, and has popularization.
Claims (2)
1. A level amplifying circuit, characterized in that: the three-phase current collector comprises six resistors R1-R6, four capacitors C1-C4, two diodes D1 and D2 and a triode Q1, wherein one end of the resistor R1 is connected to the positive electrode, the other end of the resistor R1 is connected to the collector of the triode Q1, one end of the resistor C1 is connected between R1 and the collector of the triode Q1, the other end of the resistor C1 is connected to the LEVEL input end, the diode D1 is arranged between the capacitor C1 and the LEVEL input end, one end of the diode D2 is arranged between the diode D1 and the capacitor C1, the other end of the diode D2 is grounded, one end of the capacitor C2 is connected between the capacitor C1 and the LEVEL input end, the other end of the resistor R2 is grounded, the resistor R3 is connected in parallel between the base and the collector of the triode Q1, the base of the triode Q1 and the resistor C4 are connected in series with the signal output end of the resistor C1 and the triode Q5, and the base of the resistor Q1 is connected in series with the signal output end of the triode Q5;
the resistance value of the resistor R1 is 10KΩ+ -5%, the resistance value of the resistor R2 is 4KΩ+ -5%, the resistance value of the resistor R3 is 470KΩ+ -5%, the resistance value of the resistor R4 is 100deg.KΩ+ -5%, the resistance value of the resistor R5 is 100deg.KΩ+ -5%, and the resistance value of the resistor R6 is 1KΩ+ -5%; the capacitance of the capacitors C1-C4 is 1 mu F, and the voltage of the capacitors C1-C4 is 25V.
2. A level amplifying circuit according to claim 1, wherein: the circuit comprises ten test interfaces TP 1-TP 10, wherein the test interface TP1 is arranged between a resistor R1 and an anode, the test interface TP2 is arranged between a resistor R2 and a LEVEL input end, the test interface TP3 is arranged between a capacitor C1 and a diode D1, the test interface TP4 is arranged between an emitter of a triode Q1 and a resistor R6, the test interface TP5 is arranged between the resistor R3 and a collector of the triode Q1, the test interface TP6 is arranged between the resistor R5 and a base of the triode Q1, the test interface TP7 is arranged between the capacitor C4 and the resistor R5, the test interface TP8 is arranged between the resistor R5 and an L signal output end, the test interface TP9 is arranged between the capacitor C3 and the resistor R4, and the test interface TP10 is arranged between the resistor R4 and the R signal output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010031461.0A CN111211738B (en) | 2020-01-13 | 2020-01-13 | Level amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010031461.0A CN111211738B (en) | 2020-01-13 | 2020-01-13 | Level amplifying circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111211738A CN111211738A (en) | 2020-05-29 |
| CN111211738B true CN111211738B (en) | 2023-08-22 |
Family
ID=70789030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010031461.0A Active CN111211738B (en) | 2020-01-13 | 2020-01-13 | Level amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111211738B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995032A (en) * | 2009-08-13 | 2011-03-30 | 李春龙 | Electronic ignition device circuit |
| CN104393849A (en) * | 2014-11-18 | 2015-03-04 | 成都措普科技有限公司 | Voice frequency processing system based on adaptive gain control |
| CN105375884A (en) * | 2015-11-24 | 2016-03-02 | 宁波柏人艾电子有限公司 | Loudspeaker box power amplification circuit |
| WO2016179749A1 (en) * | 2015-05-08 | 2016-11-17 | 华为技术有限公司 | Leakage current testing circuit and method |
-
2020
- 2020-01-13 CN CN202010031461.0A patent/CN111211738B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995032A (en) * | 2009-08-13 | 2011-03-30 | 李春龙 | Electronic ignition device circuit |
| CN104393849A (en) * | 2014-11-18 | 2015-03-04 | 成都措普科技有限公司 | Voice frequency processing system based on adaptive gain control |
| WO2016179749A1 (en) * | 2015-05-08 | 2016-11-17 | 华为技术有限公司 | Leakage current testing circuit and method |
| CN105375884A (en) * | 2015-11-24 | 2016-03-02 | 宁波柏人艾电子有限公司 | Loudspeaker box power amplification circuit |
Non-Patent Citations (1)
| Title |
|---|
| 胡斌 ; .电子线路学习方法(十六) 第八讲 单级放大器电路分析方法(上).电子世界.2011,(01),全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111211738A (en) | 2020-05-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111211738B (en) | Level amplifying circuit | |
| CN201014993Y (en) | Testing circuit improvement for PCB tester | |
| US7545156B2 (en) | Test circuit and test method that includes supplying a current to a plurality of light-receiving elements | |
| US4290026A (en) | Power amplifier whose bias voltage changes depending on power supply voltage | |
| CN214591327U (en) | Common base false grounding mixer | |
| EP0126427A2 (en) | Level detector for use with a differential amplifier circuit | |
| CN107948903A (en) | A kind of MEMS microphone tests system | |
| CN114326542A (en) | Signal generating circuit for industrial hybrid control | |
| CN215218953U (en) | Novel static current detection device | |
| JPS5957171A (en) | Peak voltage detection circuit | |
| CN201252517Y (en) | Noise suppression circuit and electron device with magnified audio power | |
| CN205945662U (en) | Permanent mutual conductance bias circuit and first detector | |
| CN208820748U (en) | A kind of triode Current amplifier Curve Matching circuit | |
| JPS61251214A (en) | Power supply circuit | |
| CN2137841Y (en) | Computer testing instrument for dials | |
| CN201876489U (en) | Voice voltmeter | |
| JPH06120747A (en) | Differential amplifier | |
| JP4021338B2 (en) | DC output offset detection circuit for BTL connection amplifier | |
| Gift et al. | Bipolar Junction Transistor | |
| Hofer | Measuring switch-mode power amplifiers | |
| CN220709246U (en) | Power supply verification circuit for multi-power supply processor | |
| KR930002447B1 (en) | Noise test equipment of analog ic | |
| US2426419A (en) | Return trace blanking and mixing | |
| CN206517382U (en) | One kind improves PSR output dynamic load potential circuits | |
| JPH04238388A (en) | Test circuit for display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |