KR880001476Y1 - Middle and long wave local oscillation switching circuit - Google Patents

Middle and long wave local oscillation switching circuit Download PDF

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KR880001476Y1
KR880001476Y1 KR2019850012431U KR850012431U KR880001476Y1 KR 880001476 Y1 KR880001476 Y1 KR 880001476Y1 KR 2019850012431 U KR2019850012431 U KR 2019850012431U KR 850012431 U KR850012431 U KR 850012431U KR 880001476 Y1 KR880001476 Y1 KR 880001476Y1
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wave
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long
long wave
unit
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KR870005942U (en
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박승태
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삼성전자 주식회사
정재은
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
    • H04B1/0082—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

내용 없음.No content.

Description

중·장파 국부발진 전환회로Medium and long wave local oscillation switching circuit

제1도는 본 고안의 회로도이다.1 is a circuit diagram of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 중파동조부 2 : 장파동조부1: Medium wave grandfather 2: Long wave grandfather

3 : 중파혼합부 4 : 중파발진부3: medium frequency mixing part 4: medium frequency oscillation part

5 : 장파혼합부 6 : 장파발진부5: long wave mixing part 6: long wave oscillation part

7 : 중간주파선택부 8 : 선택스위치부7: middle frequency selector 8: selector switch

MW ANT : 중파안테나 LW ANT : 장파안테나MW ANT: Medium wave antenna LW ANT: Long wave antenna

CF1: 세라믹필터 V1~V4: 트리머콘덴서CF 1 : Ceramic Filter V 1 ~ V 4 : Trimmer Capacitor

IF : 중간주파입력단 MW,LW : 중·장파스위치접점IF: Middle frequency input terminal MW, LW: Middle and long wave switch contact

TR1~TR4: 트랜지스터TR 1 to TR 4 : Transistor

본 고안은 국부발진 절환회로에 관한 것으로, 특히 트랜지스터를 사용하여 중·장파 국부발진을 절환시킬 수 있도록 된 중·장파 국부발진 절환회로에 관한 것이다.The present invention relates to a local oscillation switching circuit, and more particularly, to a medium- and long-wave local oscillating switching circuit which is capable of switching medium- and long-wave local oscillation using a transistor.

일반적으로 장파와 중파(MW) 및 FM방송들을 수신할 수 있는 음향기기에 있어서, 뮤직센터의 튜너부근에서 외부 디자인관계나 기구적인 문제로 바리콘과 밴드절환스위치가 떨어져 설치되어 있을 때, 기계적 스위치로는 튜너부를 만들기가 불가능하였으므로 전자회로적인 트랜지스터 스위치를 이용하여 절환회로를 구성하여 사용했었으나, 중파방송을 수신하고자 할 때 중파발진부에 접지점을 제공하기 위해 기계적 스위치를 통해서 중간발진부의 일측을 접지점과 연결하였거나, 제품가격 저렴화의 일원으로 기계적 스위치를 스위칭 트랜지스터로 대채하여 사용하였다. 이러한 종래회로에서 중파방송을 수신할 때에는 턴온된 스위칭 트랜지스터에 의해 중파접지점이 제공되는데, 이때 턴온된 스위칭 트랜지스터의 분포용량으로 인하여 수신감도가 저하되고 발진이 발생되는 결점이 있었다.In general, in the acoustic equipment capable of receiving long-wave, medium-wave (MW) and FM broadcasts, the mechanical switch is used when the baricone and the band switching switch are installed away from the tuner of the music center due to external design relations or mechanical problems. Since it was impossible to make the tuner part, the switching circuit was configured by using the electronic circuit switch, but when one wants to receive medium frequency broadcasting, one side of the intermediate oscillation part is connected to the ground point through a mechanical switch to provide the ground point to the medium frequency oscillation part. In order to reduce the product price, mechanical switches are used as switching transistors. In the conventional circuit, when receiving a medium frequency broadcast, a medium frequency ground point is provided by the turned-on switching transistor. At this time, the reception sensitivity is lowered and oscillation occurs due to the distribution capacity of the turned-on switching transistor.

본 고안은 상기한 문제점을 개선한 것으로, 간단한 회로로 구성하여 제작비용을 절감시킬 수 있을 뿐더러, 바리콘과 절환스위치의 위치에 구애를 받지않고 박형으로 된 뮤직센터나 대형카셋트의 외관디자인을 자유롭게 제작하기 위하여, 국부절환 스위칭회로를 간략화시킴으로써 중파동작시에는 장파안테나를 오픈시키고, 장파동작시에는 장파안테나를 중파안테나와 직렬연결하여 사용하도록 된 중장파 국부발진 절환회로를 제공함에 고안의 목적이 있었다.The present invention improves the above-mentioned problems, and it is possible to reduce the production cost by constructing a simple circuit, and to freely produce the exterior design of a thin music center or a large cassette regardless of the position of the barricon and the switching switch. In order to simplify the local switching switching circuit, a long wave antenna was opened during medium wave operation, and a long wave antenna was used to connect the long wave antenna in series with the medium wave antenna in long wave operation. .

이하 본 고안의 구성 및 작용, 효과를 예시도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, the configuration, operation, and effects of the present invention will be described in detail with reference to the accompanying drawings.

본 고안은 중파동조부(1)의 출력일단에는 중파혼합부(3)에 있는 트랜지스터(TR1)의 베이스가 연결되고, 중간혼합부(3)에 있는 트랜지스터(TR1)에는 중파발진부(4)가 연결됨과 더불어 다이오드(D1)와 저항(R3)을 통하여 중장파동조부(1)의 공통단자(P)가 연결되며, 장파동조부(2)의 출력일단에는 장파혼합부(5)에 있는 저항(R7)(R8)과 트랜지스터(TR3)의 베이스가 연결되고, 장파혼합부(5)에 있는 저항(R7)의 다른 일단에는 선택스위치부(8)의 단파스위치접점(LW)이 연결되며, 장파동조부(2)에 있는 트랜지스터(TR2)의 베이스단자에는 저항(R6)(R11)을 매개하여 트랜지스터(TR4)의 베이스가 연결되고, 장파혼합부(5)에 있는 트랜지스터(TR3)의 컬렉터 및 에미터에는 저항(R10)과 콘덴서(C8)를 통해 장파발진부(6)의 입력단이 연결되며, 장파발진부(6)의 출력단에는 중간주파선택부(7)를 매개하여 다음단인 중간주파 입력단(IF)이 연결되고, 중간주파선택부(7)내에 있는 저항(R11)의 일단에는 선택스위치부(8)가 연결된 구조로 되어있다.According to the present invention, the base of the transistor TR 1 in the medium wave mixing section 3 is connected to the output end of the medium wave tuning section 1 , and the medium wave oscillation section 4 in the transistor TR 1 in the middle mixing section 3. ) And the common terminal P of the medium and long wave tuning section 1 are connected through the diode D 1 and the resistor R 3 , and the long wave mixing section 5 at the output end of the long wave tuning section 2. The resistors R 7 (R 8 ) and the base of the transistor TR 3 are connected, and the other end of the resistor R 7 in the long wave mixing section 5 is a short-wave switch contact of the selector switch section 8. LW is connected, and a base of the transistor TR 4 is connected to the base terminal of the transistor TR 2 in the long wave tuning unit 2 through a resistor R 6 and R 11 . the output terminal of the transistor (TR 3) of the collector and emitter, the resistance (R 10) and a capacitor and is connected to the input terminal of the long-wave oscillation unit (6) through (8 C), long-wave oscillation unit (6) in (5) Once the structure is selected, the switch unit (8) connected to the resistance (R 11) is within the parameters of the intermediate frequency selector (7) next stage of the intermediate frequency input end (IF) is connected, the intermediate frequency selector (7) It is.

미설명 부호 MW ANT는 중파안테나, LW ANT는 장파안테나, T는 중간주파 트랜스, CF1는 세라믹필터, V1~V4는 트리머 콘덴서를 나타낸다.Reference numeral MW ANT denotes a medium frequency antenna, LW ANT denotes a long wave antenna, T denotes a medium frequency transformer, CF 1 denotes a ceramic filter, and V 1 to V 4 denote trimmer capacitors.

이상과 같이 구성된 본 고안은 먼저 선택스위치부(8)가 장파단자(LW)에 접속될 경우에는 트랜지스터(TR1)의 베이스에 바이어스 전압이 인가되지 않으므로 중파발진부(4)가 동작되지 않는다.According to the present invention configured as described above, when the selection switch unit 8 is connected to the long wave terminal LW, the medium wave oscillation unit 4 does not operate because a bias voltage is not applied to the base of the transistor TR 1 .

이때 바리콘(VC1)의 조정에 의해 선국된 방송국의 주파수를 갖는 신호가 장파안테나(LW ANT)를 통해 수신되어 장파동조부(2)를 거쳐 장파혼합부(5)에 있는 트랜지스터(TR3)의 베이스에 입력된다. 따라서 장파발진부(6)의 동작에 의해 출력된 신호는 중간주파선택부(7)에 있는 중간주파 트랜스(T) 및 세라믹필터(CF1)에 의해 오디오주파수의 중간주파수인 455KHZ에 가깝게 여파된 후 중간주파입력단(IF)으로 입력된다.At this time, the signal having the frequency of the tuned station tuned by the baric VC 1 is received through the long wave antenna (LW ANT) through the long wave tuning section 2 and the transistor TR 3 in the long wave mixing section 5. Is entered at the base of the. Therefore, the signal output by the operation of the long wave oscillation unit 6 is filtered by the intermediate frequency transformer T and the ceramic filter CF 1 in the intermediate frequency selecting unit 7 close to 455KHZ, which is the intermediate frequency of the audio frequency. It is input to the intermediate frequency input terminal IF.

그리고 선택스위치부(8)가 중간단자(MW)에 접속된 경우에는 트랜지스터(TR3)의 베이스에 바이어스전압이 인가되지 않으므로 장파발진부(6)가 동작되지 않는다.When the selection switch unit 8 is connected to the intermediate terminal MW, since the bias voltage is not applied to the base of the transistor TR 3 , the long wave oscillation unit 6 does not operate.

이때 바리콘(VC1)의 조정에 의해 선국된 방송국의 주파수를 갖는 신호가 중파안테나(NW)를 통해서 수신되어 중파동조부(1)를 통해서 중파혼합부(3)에 있는 트랜지스터(TR1)의 베이스로 입력되고, 또한 트랜지스터(TR1)의 베이스에는 선택스위치(8)를 통해 B+전압이 인가되므로 트랜지스터(TR1)는 턴온되어 중파발진부(4)가 동작을 하게된다.At this time, a signal having a frequency of the tuned station tuned by the baric VC 1 is received through the medium frequency antenna NW, and then through the medium frequency tuning part 1 of the transistor TR 1 in the medium frequency mixing part 3. It is input to the base, and is also the since the B + voltage via the base, the selection switch (8) of the transistor (TR 1) is a transistor (TR 1) is turned on medium wave oscillation unit (4) to the operation.

한편 중파발진부(4)의 직류분은 장파혼합부(5)의 트랜지스터(TR4)의 베이스에 입력되어 트랜지스터(TR4)의 에미터단자를 통해 접지되고, 이때 중파안테나(MW ANT)를 통해 수신된 신호는 중파혼합부(3)의 트랜지스터(TR1)의 베이스에 입력 된 전원에 의해 중파발진부(4)에서 발진이 시작되어 수신주파수와 발진주파수의 차신호인 455KHZ중간주파수로 여파된 후 다이오드(D2)(D3) 및 중간주파증폭부(7)를 통해 중간주파입력단(IF)로 출력된다.Meanwhile, the DC portion of the medium wave oscillation unit 4 is input to the base of the transistor TR 4 of the long wave mixing unit 5 and grounded through the emitter terminal of the transistor TR 4 , and at this time, through the medium wave antenna MW ANT. The received signal starts oscillation in the medium wave oscillation unit 4 by the power input to the base of the transistor TR 1 of the medium wave mixing section 3, and is then filtered to the 455KHZ intermediate frequency which is the difference signal between the reception frequency and the oscillation frequency. The diode D 2 is output to the intermediate frequency input terminal IF through the D 3 and the intermediate frequency amplifier 7.

상기한 바와 같이 본 고안은 4개의 트랜지스터를 사용하여 중파동작시에는 장파안테나로 부터 수신되는 전파를 차단시키고, 장파 동작시에는 중파 안테나로 부터 수신되는 전파를 차단시켜 중파안테나를 장파안테나에 직렬연결하여 사용할 수 있도록 하므로써 회로의 구성이 간단하게 되어 제작원가가 절감될 뿐만아니라, 바리콘이나 절환스위치의 위치에 구애를 받지않고 박형으로 된 뮤직센터나 대형카셋트에서도 외관의 디자인을 자유롭게 제작할 수 있는 장점이 있다.As described above, the present invention uses four transistors to block the radio wave received from the long wave antenna during medium wave operation, and blocks the radio wave received from the medium wave antenna during long wave operation, thereby connecting the medium wave antenna to the long wave antenna in series. The circuit configuration is simplified by making it possible to use it, and the production cost is reduced, and the advantage of being able to freely design the exterior design even in a thin music center or a large cassette regardless of the position of the barricon or the switching switch. have.

Claims (1)

중·장파동조부(1)(2)와 중·장파발진부(4)(6)를 구비한 음향기기의 국부발진 전환회로에 있어서, 중파동조부(1)에는 중파스위치접점(MW)이 연결된 트랜지스터(TR1)와 다이오드(D1), 저항(R1)(R2)(R3)(R4)및 콘덴서(C1)로 구성된 중파혼합부(3)를 매개하여 중파발진부(4)가 연결되고, 장파동조부(2)에는 단파스위치접점(LW)이 연결된 트랜지스터(TR3)와 저항(R7)(R8)(R9)으로 구성된 장파혼합부(5)가 연결되며, 장파혼합부(5)에는 중파발진부(4)로 입력되는 직류성분을 차단하는 트랜지스터(TR4)를 매개하여 장파발진부(6)가 여결되고, 장파발진부(6)에는 중간주파트랜스(T)와 세라믹필터(CF1), 저항(R11) 및 콘덴서(C10)로 구성된 중간주파선택부(7)가 연결되며, 중간주파선택부(7)에는 선택스위치부(8)가 연결되어서 중·장파의 국부발진을 절환시킬 수 있도록 된 중·장파 국부발진 절환회로.In the local oscillation switching circuit of an acoustic apparatus having a medium and long wave tuning unit (1) (2) and a medium and long wave oscillating unit (4) and (6), a medium wave tuning unit (1) has a medium wave switch contact (MW) connected thereto. Medium wave oscillation unit 4 via a medium wave mixing unit 3 composed of a transistor TR 1 , a diode D 1 , a resistor R 1 , R 2 , R 3 , R 4 , and a capacitor C 1 . ) Is connected, and the long wave mixing part 2 is connected to a long wave mixing part 5 composed of a transistor TR 3 connected to a short wave switch contact point LW and a resistor R 7 (R 8 ) (R 9 ). The long wave oscillation unit 6 is filtered through the long-wave mixing unit 5 through a transistor TR 4 that blocks the DC component input to the medium wave oscillation unit 4, and the long wave oscillation unit 6 has an intermediate frequency transformer T. And an intermediate frequency selector 7 composed of a ceramic filter CF 1 , a resistor R 11 , and a capacitor C 10 , and a selector switch 8 connected to the intermediate frequency selector 7. To switch the local wave of long wave Medium and long-wave local oscillator switching circuit.
KR2019850012431U 1985-09-25 1985-09-25 Middle and long wave local oscillation switching circuit KR880001476Y1 (en)

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KR880001476Y1 true KR880001476Y1 (en) 1988-04-21

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