KR880000910Y1 - Electronic channel selecting circuit - Google Patents
Electronic channel selecting circuit Download PDFInfo
- Publication number
- KR880000910Y1 KR880000910Y1 KR2019850005606U KR850005606U KR880000910Y1 KR 880000910 Y1 KR880000910 Y1 KR 880000910Y1 KR 2019850005606 U KR2019850005606 U KR 2019850005606U KR 850005606 U KR850005606 U KR 850005606U KR 880000910 Y1 KR880000910 Y1 KR 880000910Y1
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- South Korea
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- transistor
- resistor
- base
- power supply
- channel
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
- H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
- H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
Abstract
내용 없음.No content.
Description
첨부도면은 본 고안의 회로도.The accompanying drawings are circuit diagrams of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
SW1, SW2: 소프트터치스위치 R1-R11: 저항SW 1 , SW 2 : Soft touch switch R 1- R 11 : Resistance
TR1- TR4: 트랜지스터 D1,D2: 다이오드TR 1 -TR 4 : transistor D 1 , D 2 : diode
C1: 콘덴서 1, 2 : 각각의 채널신호입력단자C 1 : Capacitor 1, 2: Each channel signal input terminal
3 : 영상증폭단3: video amplifier
본 고안은 모니터겸용 텔레비젼이나 비데오테이프레코더와 연결하여 사용하는 텔레비젼등에 있어서, 입력되는 2개의 채녈신호중에서 소프트터치(Soft Touch)스위치에 의해 사용자가 원하는 채널신호를 선택하도록된, 전자식 채널 선택회로에 대한 것이다.The present invention provides an electronic channel selection circuit in which a user selects a desired channel signal by a soft touch switch among two input signals inputted in a monitor-use television or a television used in connection with a video tape recorder. It is about.
종래의 모니터겸용 텔레비젼 또는 비데오레코더와 연결된 텔레비젼에서는 기계식스위치를 절환시켜 2개의 입력채널중 1개의 채널을 선택하도록 되어 있기 때문에, 채널전환시 2개의 채널신호상호간의 고주파간섭(비데오신호의 주파수는 4MHz정도의 고주파임)이나 스위치 접점의 '온-오프'에의해 노이즈가 화면에 나타나는 결점이 있었다.In conventional TVs or monitors connected with a video recorder, a mechanical switch is switched to select one channel from two input channels, so when switching channels, the high frequency interference between two channel signals (the frequency of the video signal is 4 MHz). High frequency) or the 'on-off' of the switch contacts, causing noise to appear on the screen.
본 고안은 상기와 같은 결점을 해결하기 위한 것으로서, 입력된 2개의 채널신호중 2개의 소프트 터치스위치의 조작에 의한 스위칭기능에 의해 1개의 채널선택신호를 선택할 수 있도록 한 전자식 채널 선택회로에 대한 것으로, 이를 첨부 도면에 의해 상술하면 다음과 같다.The present invention is to solve the above-described drawbacks, the electronic channel selection circuit to select one channel selection signal by the switching function of the operation of two soft touch switch of the two input channel signals, This will be described below with reference to the accompanying drawings.
일측접점이 저항(R1)을 통해 B+전원에 연결된 1채널 선택스위치(SW1)의 타측 접점과, 일측접점이 저항(R2)을 통해 접지된 2채널 선택스위치(SW2)의 타측접점을 서로 공접시킨후 에미터가 접지된 트랜지스터(TR1)의 베이스에 연결함과 동시에 콘덴서(C1)을 통해 B+전원에 연결하고, 트랜지스터(TR1)의 콜렉터를 다이오드(D1) 및 저항(R5)을 통해 에미터가 접지된 트랜지스터(TR2)의 베이스에 연결함과 동시에 저항(R3)을 통해 B+전원에 그리고 저항(R4)을 통해 트랜지스터(TR4)을 연결하며, 트랜지스터(TR2)의 콜렉터를 저항(R6)을 통해 B+전원에 그리고 저항(R3)을 통해 트랜지스터(TR3)의 베이스에 연결함과 동시에 다이오드(D2) 및 저항(R7)을 통해 트랜지스터(TR1)의 베이스에 연결하고, 트랜지스터(TR3)의 에미터를 2채널 입력단자(2) 및 저항(R9)을 통해 B+전원에 공접시키며, 트랜지스터(TR4)의 에미터를 1채널 입력단자(1) 및 저항(R9)을 통해 B+전원에 공접시키고, 상기의 각 트랜지스터(TR3)(TR4)의 콜렉터를 공접시킨후 통상의 영상증폭단(3)에 연결함과 동시에 저항(R10)을 통해 접지 시킨 구성으로서 미설명부호중 P는 일점을 나타낸다.The other contact of the one-channel selector switch SW 1 connected to the B + power supply through the resistor R 1 and the other side of the two-channel selector switch SW 2 with the one contact grounded through the resistor R 2 . After contacting each other, the emitter is connected to the base of the grounded transistor (TR 1 ) and at the same time to the B + power supply through the capacitor (C 1 ), and the collector of the transistor (TR 1 ) is connected to the diode (D 1 ). and a resistor (R 5) the transistor (TR 4) to the B + power supply and at the same time connected to the base of an emitter grounded transistor (TR 2) via a resistor (R 3) and via a resistor (R 4) through Connect the collector of transistor TR 2 to B + power supply via resistor R 6 and to the base of transistor TR 3 through resistor R 3 , and at the same time diode D 2 and resistor ( R 7 ) to the base of transistor TR 1 , and the emitter of transistor TR 3 to a two-channel input terminal 2 and a resistor ( R 9) sikimyeo B + gongjeop the power via a transistor (TR 4) emitter a and B + gongjeop the power source through a first channel input terminal (1) and a resistor (R 9), each transistor of the (TR 3 ), And the collector of TR 4 is connected to the normal image amplifier stage 3 and grounded through the resistor R 10 .
상기와 같은 구성인 본 고안의 작용 및 효과는 아래와 같다.The operation and effects of the present invention as the configuration is as follows.
테레비젼의 전원스위치를 켜면 본 고안의 회로도 B+전원이 공급되면서 순간적으로 콘덴서(C1)에 충전되므로, 이에 의해 트랜지스터(TR1)의 베이스가 'HIGH' 레벨로 되어 이 트랜지스터(TR1)가 도통상태로 된다.When the power switch of the TV is turned on, the circuit diagram of the present invention is instantaneously charged with the capacitor C 1 while the B + power is supplied, thereby bringing the base of the transistor TR 1 to the 'HIGH' level so that the transistor TR 1 is turned on. It is in a state.
따라서 상기의 트랜지스터(TR1)의 콜렉터단인 P점의 전위가 'LOW'레벨로 되며, 이에 의해 트랜지스터(TR2)는 '커트-오프'되는 반면 PNP트랜지스터(TR4)는 에미터와 베이스간에 순바이어스가 되어 도통상태로 됨으로서, 단지(1)에 인가된 1채널 신호가 상기의 도통상태의 트랜지스터(TR4)를 통해 통상의 영상증폭단(3)으로 입력되고 이에의해 테레비젼 수상관에서는 1채널 신호에 의한 화면이 디스플레이 된다.Therefore, the potential of the point P, which is the collector end of the transistor TR 1 , becomes 'LOW' level, whereby the transistor TR 2 is 'cut-off' while the PNP transistor TR 4 is emitter and base. By being forward biased to the conduction state, the one-channel signal applied to the complex 1 is input to the normal image amplification stage 3 through the transistor TR 4 in the conduction state, thereby providing 1 in the TV receiver. The screen by the channel signal is displayed.
이때, 전술한 바와 같이 트랜지스터(TR2)가 '커트-오프'상태이므로 이 트랜지스터(TR2)의 콜렉터단은 'HIGH'레벨로 되는데, 이 'HIGH'레벨전압이 다이오드(D2) 및 저항(R7)을 통해 트랜지스터(TR1)의 베이스에 공급됨으로써 이 트랜지스터(TR1)가 계속 도통상태로 유지되는 한편, PNP트랜지스터(TR3)는 에미터와 베이스간에 역바이어스로 되어 '커트-오프'됨으로써 단자(2)에 인가된 2채널신호는 차단된 상태에 있게 된다.At this time, as described above, since the transistor TR 2 is in the 'cut-off' state, the collector terminal of the transistor TR 2 is at the 'HIGH' level, and the 'HIGH' level voltage is the diode D 2 and the resistor. The transistor TR 1 remains in the conductive state by being supplied to the base of the transistor TR 1 through R 7 , while the PNP transistor TR 3 is reverse biased between the emitter and the base, and thus the 'cut-' Off, the two-channel signal applied to the terminal 2 is in a blocked state.
이와같은 상태에서 2채널선택스위치(SW2)를 누르면, 저항(R6), 다이오드(D2) 및 저항(R7)을 통해 트랜지스터(TR1)의 베이스에 베이스전압으로 공급되던 B+전압이 다시 2채널선택스위치(SW2) 및 저항(R2)을 통해 바이패스됨으로써 상기의 트랜지스터(TR1)의 베이스가 'LOW'레벨로 된다.In this state, when the two-channel selection switch SW 2 is pressed, the B + voltage supplied as the base voltage to the base of the transistor TR 1 through the resistor R 6 , the diode D 2 , and the resistor R 7 is provided. The base of the transistor TR 1 is brought to the 'LOW' level by being bypassed through the two channel selection switch SW 2 and the resistor R 2 again.
따라서 트랜지스터(TR1)가 '커트-오프'되어 P점의 전위는 'HIGH'레벨로 되므로, 이에 의해 도통중인 PNP트랜지스터(TR4)가 '커트-오프'되어 단자(1)에 인가된 1채널신호가 차단되는 한편, 트랜지스터(TR2)가 도통되어 그 콜렉터단은'LOW'레벨로 되는 것으로서, 이에 의해 PNP트랜지스터(TR2)가 에미터와 베이스간이 순바이어스로 되어 도통상태로 됨으로써 단자(2)에 인가된 2채널신로가 상기의 도통상태의 트랜지스터(TR3)를 통해 통상의 영상증폭단(3)으로 입력되므로, 테레비젼 수상관에서는 2채널 신호에 의한 화면이 디스플레이되게 된다.Therefore, since the transistor TR 1 is 'cut off' and the potential at the P point is at the 'HIGH' level, the PNP transistor TR 4 in conduction is 'cut off' and is applied to the terminal 1. While the channel signal is interrupted, the transistor TR 2 is turned on so that its collector stage is at the 'LOW' level. As a result, the PNP transistor TR 2 is in a forward bias between the emitter and the base and is brought into a conductive state. Since the two-channel path applied to (2) is inputted to the normal video amplifier stage 3 through the transistor TR 3 in the conducting state, the TV picture tube is displayed with the two-channel signal.
또한, 이와같이 2채널수신중 다시 1채널선택스위치(SW1)를 누르게되면, B+전압이 저항(R1) 및 1채널선택스위치(SW1)를 통해 트랜지스터(TR1)의 베이스에 공급되어 이 트랜지스터(TR1)가 도통상태로 되고, 이하 전술한바와 같이 테레비젼의 전원스위치를 켰을 경우에 동일한 회로동작에 의해 단자(2)에 인가된 2채널신호가 차단되는 반면, 단자(1)에 인가된 1채널신호가 영상증폭단(3)으로 입력되어 테레비젼 수상관에서는 다시 1채널신호에 의한 화면이 디스플레이 되는 것이다.In addition, when one channel selection switch SW 1 is pressed again during two channel reception, the B + voltage is supplied to the base of the transistor TR 1 through the resistor R 1 and the one channel selection switch SW 1 . When the transistor TR 1 is brought into a conducting state and the power switch of the TV is turned on as described above, the two-channel signal applied to the terminal 2 is cut off by the same circuit operation, while the terminal 1 The applied 1-channel signal is input to the image amplifier stage 3 so that the screen by the 1-channel signal is displayed again in the TV receiver.
이상과 같이 본 고안은 2개의 소프트터치 스위치에 의해 입력되는 2개의 채널신호중 하나의 채널신호를 선택할 수 있는 전자식 채널선택회로로서, 종래의 기계식 스위치에 의한 스위치 접점간의 접촉불량이나 양 채널신호간의 상호고주파 간섭현상을 제거시킨 유용한 고안이다.As described above, the present invention is an electronic channel selection circuit capable of selecting one channel signal from two channel signals inputted by two soft touch switches. It is a useful design that eliminates high frequency interference.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850005606U KR880000910Y1 (en) | 1985-05-15 | 1985-05-15 | Electronic channel selecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850005606U KR880000910Y1 (en) | 1985-05-15 | 1985-05-15 | Electronic channel selecting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR860015453U KR860015453U (en) | 1986-12-30 |
| KR880000910Y1 true KR880000910Y1 (en) | 1988-03-16 |
Family
ID=19242132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019850005606U KR880000910Y1 (en) | 1985-05-15 | 1985-05-15 | Electronic channel selecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR880000910Y1 (en) |
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1985
- 1985-05-15 KR KR2019850005606U patent/KR880000910Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR860015453U (en) | 1986-12-30 |
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