KR910000687Y1 - Audio amplifier with removing noise circuit of differential amplifier - Google Patents
Audio amplifier with removing noise circuit of differential amplifier Download PDFInfo
- Publication number
- KR910000687Y1 KR910000687Y1 KR2019860012698U KR860012698U KR910000687Y1 KR 910000687 Y1 KR910000687 Y1 KR 910000687Y1 KR 2019860012698 U KR2019860012698 U KR 2019860012698U KR 860012698 U KR860012698 U KR 860012698U KR 910000687 Y1 KR910000687 Y1 KR 910000687Y1
- Authority
- KR
- South Korea
- Prior art keywords
- differential amplifier
- amplifier
- audio
- audio amplifier
- click
- Prior art date
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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
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
- H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/372—Noise reduction and elimination in amplifier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안의 블록도.1 is a block diagram of the present invention.
제2도는 본 고안의 회로도.2 is a circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
A : 차동증폭기 B : 클릭음 제거회로A: Differential amplifier B: Click sound cancellation circuit
Q1,Q2,Q3: 트랜지스터 R1∼R5: 저항Q 1 , Q 2 , Q 3 : Transistors R 1 to R 5 : Resistance
C1,C2: 콘덴서 X : 발진기C 1 , C 2 : Condenser X: Oscillator
B+,Vcc : 전원단자B + , Vcc: Power terminal
본 고안은 차동증폭기를 사용한 오디오 앰프의 클릭(click)음 제거회로에 관한 것으로서 차동증폭기를 이용한 오디오 앰프에서 메인전원을 오프시킬 때 발생하는 클릭음을 제거하고자 한 것에 목적을 둔 것이다.The present invention relates to a click sound cancellation circuit of an audio amplifier using a differential amplifier, and aims to remove click sounds generated when the main power is turned off in an audio amplifier using a differential amplifier.
종래의 차동증폭기를 사용한 오디오 앰프에서 메인 전원을 오프시킬 때 입력전압 변화보다 증폭기의 동작이 완만히 진행되기 때문에 입력전압의 변화가 증폭되어 음성신호 출력으로 나타나기 때문에 사용자의 귀에 거슬리는 클릭음을 발생하게 되므로서 사용자를 불쾌하게 하는 결점을 가지고 있었다.When the main power is turned off in the conventional audio amplifier using the differential amplifier, the operation of the amplifier proceeds more slowly than the change of the input voltage. Therefore, the change of the input voltage is amplified and appears as an audio signal output. Had the drawback to displease the user.
본 고안은 상기와 같은 종래의 차동증폭기를 사용한 오디오 앰프에서 발생하는 클릭음을 제거하고 클릭음제거회로를 구성한 것으로서 이를 첨부도면에 따라서 상세히 설명하면 다음과 같다.The present invention is to remove the click sound generated in the audio amplifier using a conventional differential amplifier as described above and to configure the click sound removing circuit as described in detail according to the accompanying drawings as follows.
트랜지스터(Q2)의 베이스측에 바이어스 저항(R3)과 바이패스 콘덴서(C1)을 통하여 전원단자(B+)와 연결하고, 트랜지스터(Q3)의 베이스측에는 SIF(Sound Intermediate Frequency) 검파로부터 음성신호를 입력받는 필터용 발진기(X)를 연결하면서 트랜지스터(Q1),(Q2),(Q3)와 저항(R1),(R2),(R4)으로 구성한 차동증폭기(A)의 콜렉터측에서 음성신호를 FM 검파로 출력하는 트랜지스터(Q3)의 베이스측에는 저항(R5)과 콘덴서(C1)로 이루어진 클릭음 제거회로(B)를 연결하여서 된 것이다.Bias resistor (R 3) and a bypass capacitor (C 1) to the power supply terminal (B +) and the connection and the side of the base of the transistor (Q 3) SIF (Sound Intermediate Frequency) detection through the base side of the transistor (Q 2) A differential amplifier consisting of transistors (Q 1 ), (Q 2 ), (Q 3 ) and resistors (R 1 ), (R 2 ), (R 4 ) while connecting an oscillator (X) for receiving a voice signal from the filter. The click side of the click-removal circuit (B) consisting of a resistor (R 5 ) and a capacitor (C 1 ) is connected to the base side of the transistor (Q 3 ) for outputting an audio signal by FM detection on the collector side (A).
도면중 미설명부호 Vcc는 전원단자이다.In the figure, reference numeral Vcc denotes a power supply terminal.
이와같은 구성으로 된 본 고안의 동작 및 작용효과를 설명하면 다음과 같다.Referring to the operation and effect of the present invention with such a configuration as follows.
메인 입력전원을 온시킬 때에는 클릭을 제거회로(B)의 콘덴서(C1)이 단락 상태이기 때문에 차동증폭기(A)는 정상적으로 동작하면서 SIF 검출에서부터 필터용 발진기(X)를 통하여 입력되는 음성신호가 트랜지스터(Q3)의 베이스-콜렉터를 경유하여 FM 검차로 출력되고, 이때 콘덴서(C1)에는 전원단자(Vcc)로부터의 인가전원이 순간적으로 충전으로 하게 된다.When the main input power is turned on, the click of the elimination circuit (B) is a short-circuit of the capacitor (C 1 ), so the differential amplifier (A) operates normally. It is output by the FM detection via the base-collector of the transistor Q 3 , and at this time, the power applied from the power supply terminal Vcc is instantaneously charged to the capacitor C 1 .
그리고 메인 입력전원을 오프시키면 전원단자(Vcc)의 전원이 øV로 떨어지게 되고, 이에 따라 클릭을 제거회로(B)의 콘덴서(C1)에 되었던 전압은 필터용 발진기(X)를 통하여 입력되는 클릭을 성분과 함께 전원단자(Vcc)쪽으로 방전을 개시하게 되어 차동증폭기(A)의 트랜지스터(Q3)의 바이어스 전원을 순간적으로 로우로 떨어뜨리기 때문에 트랜지스터(Q3)의 콜렉터에서 FM 검파로 전해지는 음성신호를 없애게 되고, 이때 차동증폭기(A)의 트랜지스터(Q3)의 오프 동작이 입력신호의 변화보다 빨리 떨어뜨리기 때문에 차동증폭기(A)를 이용한 오디오 앰프에서 클릭음의 발생을 제거할 수 있게 된다.When the main input power is turned off, the power supply of the power supply terminal Vcc drops to øV. Accordingly, the voltage applied to the capacitor C 1 of the elimination circuit B is clicked through the filter oscillator X. Is discharged toward the power supply terminal (Vcc) together with the component, and the bias power supply of the transistor (Q 3 ) of the differential amplifier (A) is momentarily dropped to low, which is transmitted to the FM detection from the collector of the transistor (Q 3 ). The audio signal is eliminated, and since the off operation of the transistor Q 3 of the differential amplifier A drops faster than the change of the input signal, it is possible to eliminate the generation of the click sound in the audio amplifier using the differential amplifier A. Will be.
이와같이 동작하는 본 고안은 차동증폭기의 클릭음을 제거할 수 있게 하므로서 차동증폭기를 이용한 오디오 앰프에서 메인전원을 오프시킬 때 귀에 거슬리는 클릭음을 제거할 수 있게 하여서 오디오 앰프의 품질을 향상시킬 수 있게 한 것이다.In this manner, the present invention eliminates the click sound of the differential amplifier, thereby improving the quality of the audio amplifier by eliminating the annoying click sound when the main power is turned off in the audio amplifier using the differential amplifier. will be.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860012698U KR910000687Y1 (en) | 1986-08-21 | 1986-08-21 | Audio amplifier with removing noise circuit of differential amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860012698U KR910000687Y1 (en) | 1986-08-21 | 1986-08-21 | Audio amplifier with removing noise circuit of differential amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR880005374U KR880005374U (en) | 1988-05-12 |
| KR910000687Y1 true KR910000687Y1 (en) | 1991-02-08 |
Family
ID=19255106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019860012698U KR910000687Y1 (en) | 1986-08-21 | 1986-08-21 | Audio amplifier with removing noise circuit of differential amplifier |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR910000687Y1 (en) |
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1986
- 1986-08-21 KR KR2019860012698U patent/KR910000687Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR880005374U (en) | 1988-05-12 |
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