KR890001089Y1 - Television tunner - Google Patents
Television tunner Download PDFInfo
- Publication number
- KR890001089Y1 KR890001089Y1 KR2019850012482U KR850012482U KR890001089Y1 KR 890001089 Y1 KR890001089 Y1 KR 890001089Y1 KR 2019850012482 U KR2019850012482 U KR 2019850012482U KR 850012482 U KR850012482 U KR 850012482U KR 890001089 Y1 KR890001089 Y1 KR 890001089Y1
- Authority
- KR
- South Korea
- Prior art keywords
- voltage
- tuning
- aft
- tuner
- transistor
- Prior art date
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Abstract
내용 없음.No content.
Description
첨부도면은 본 고안의 회로도The accompanying drawings show the circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : AFT신호입력단 2 : 기준전압발생부1: AFT signal input terminal 2: reference voltage generator
3 : AFT신호중첩부 4 : 튜닝부3: AFT signal overlapping part 4: tuning part
SW : 스위치 R1-R8: 저항SW: Switch R 1- R 8 : Resistance
TR : 트랜지스터 VR : 튜닝볼륨TR: Transistor VR: Tuning Volume
본 고안은 AFT전압을 튜너의 튜닝전자(TUNER TUNING)에 인가시켜 튜너의 튜닝범위를 확대시키도록 한 테레비젼튜너의 자동 미세조정(AFT) 전압 중첩회로에 대한 것이다.The present invention is an automatic fine-tuning (AFT) voltage superposition circuit of a TV tuner to extend the tuning range of the tuner by applying the AFT voltage to the tuner tuning tuner.
종래의 튜너에는 AFT 전압입력단자가 구비되어 회로의 AFT출력전압을 스위치를 이용하여 튜너의 AF T전압 입력단자에 인가시킴으로서 튜닝범위를 확장할 수 있었으나, 최근 A FT입력단자가 없는 튜너도 다량 생산됨에 따라 이와 같은 튜너사용시는 사용자가 정확한 튜닝조작을 하지 않으면 정상적인 화면을 보기가 어렵고, 또한 튜닝범위가 좁아 정확한 튜닝을 하기가 어려운 폐단이 있었다.The conventional tuner is equipped with an AFT voltage input terminal, so that the tuning range can be extended by applying the AFT output voltage of the circuit to the AF T voltage input terminal of the tuner using a switch, but recently, a large number of tuners without the A FT input terminal are also produced. Therefore, when using such a tuner, it is difficult to see a normal screen unless the user performs an accurate tuning operation, and also a narrow tuning range makes it difficult to perform accurate tuning.
본 고안은 이와 같은 폐단을 해결하기 위한 것으로서, 회로내의 AFT 전압출력을 채널선택을 위해 발생시킨 기준전압 중첩시킨 상태에서 튜너의 튜닝단자에 자동으로 인가되도록 함으로써, 튜닝범위를 확대시켜 사용자가 원하는 채널을 손쉽게 세팅할수 있도록 안출한 것으로서, 이를 첨부도면에 의해 상술하면 다음과 같다.The present invention is to solve such a closed end, by automatically applying to the tuning terminal of the tuner in a state in which the AFT voltage output in the circuit overlaps the reference voltage generated for channel selection, thereby expanding the tuning range to the channel desired by the user. It is conceived to make it easy to set, described in detail by the accompanying drawings as follows.
AFT 전압입력단자(1)를 선택스위치(SW)를 통해 분압용 저항(R2)(R3)으로 된 기준전압 발생부(2)에 연결하고, 이 기준전압발생부(2)에 의한 분배전압에 의해 제어되는 트랜지스터(TR)와 저상(R5-R7)로 된 AFT신호중첩부(3)의 출력단을 통상의 튜닝부(4)내의 튜닝볼륨(VR)의 일측에 연결시킨 구성으로서, 미설명 부호중 B+는 직류전원공급단자, C1, C2는 리플방지 제거용 콘덴서, R1, R4, R8은 저항, D1은 정전압용 제너다이오드, D2, D3는 역바이어스 방지용 다이오드, 5는 튜너의 튜닝단자이다.The AFT voltage input terminal (1) is connected to the reference voltage generator (2) of the voltage divider (R 2 ) (R 3 ) through the selector switch (SW) and distributed by the reference voltage generator (2). The output terminal of the AFT signal overlapping portion 3 of the transistor TR controlled by the voltage and the low phase R 5 -R 7 is connected to one side of the tuning volume VR in the ordinary tuning portion 4. B + is DC power supply terminal, C 1 and C 2 are ripple elimination capacitors, R 1 , R 4 and R 8 are resistors, D 1 is zener diode for constant voltage, and D 2 and D 3 are reversed. A bias preventing diode, 5, is a tuning terminal of the tuner.
이하 본 고안의 작용 및 효과를 설명한다.Hereinafter will be described the operation and effect of the present invention.
B+전압이 저항(R1) 및 제너다이오드(D1)를 통해 전압 조정됨으로써 전 채널에서 요구되는 전압이 만들어지고, 이 전압은 튜닝부(4)내의 튜닝볼륨(VR)에 인가되는데, 이 튜닝볼륨(VR)을 조절함으로써 각 채널에 대응하는 튜닝전압이 발생되어 원하는 채널을 선국하게 된다.The voltage B + is regulated through the resistor R1 and the zener diode D 1 to make a voltage required for all channels, and this voltage is applied to the tuning volume VR in the tuning section 4, which is tuned. By adjusting the volume VR, a tuning voltage corresponding to each channel is generated to tune a desired channel.
이때 선택스위치(SW)가 '오프'된 상태이면 상기의 저항(R1)및 제너다이오드At this time, if the selection switch SW is 'off' state, the resistor R 1 and the zener diode
(D1)에 의해 제어된 B+전압이 기준전압 발생부(2)내의 각 저항(R2)(R3)에 의해 분배된 상태에서 AFT 신호 중첩부(3)내의 트랜지스터(TR)의 베이스에 인가된다.The base of the transistor TR in the AFT signal overlap 3 with the B + voltage controlled by (D 1 ) distributed by each resistor R 2 (R 3 ) in the reference voltage generator 2 . Is applied to.
만약, 선택스위치(SW)가 '온'상태이면 상기의 트랜지스터(TR)의 베이스로는 저항(R2)(R3)의 분배전압과 함께 단자(1)로 입력된 AFT 출력전압이 중첩되어 인가된다.If the selection switch SW is in an 'on' state, the AFT output voltage input to the terminal 1 is overlapped with the division voltages of the resistors R 2 and R 3 at the base of the transistor TR. Is approved.
즉, 예를들어 선택스위치(SW)가 '오프'되어 AFT 전압공급이 차단된 경우 저항That is, for example, when the selection switch SW is 'off' and the AFT voltage supply is cut off,
(R2)(R3)에 의해 분압된 6.2V-7V의 전압이 트랜지스터(TR)의 베이스에 인가되도록 설정하게 되면, 상기의 선택 스위치(SW)를 '온'시켜 AFT 출력전압이 입력될 경우에는 이 AFT 출력전압이 튜닝점(TUNING POINT)에 따라 0V-12V까지 변화하게 됨으로써, 트랜지스터(TR)의 베이스에는 이 AFT 출력전압과 전술한 6.2V-7V의 기준전압과의 비교전압이 걸리게 된다. 따라서, 이 트랜지스터(TR)의 베이스 전압에 의해 트랜지스터(TR)의 구동이 제어되고 이에의해 이 트랜지스터(TR)의 콜렉터, 즉 저항(R5)에 흐르는 전류의 양이 제어됨으로써 튜닝부(4)내의 튜닝볼륨(VR)으로의 인가전압이 자동조절되는 것으로서, 이에의해 튜너의 튜닝범위가 확장되기 때문에 사용자가 편리하게 채널선국을 행할 수 있게 되는 것이다.When the voltage of 6.2V-7V divided by (R 2 ) (R 3 ) is set to be applied to the base of the transistor TR, the selection switch SW is turned on to input the AFT output voltage. In this case, the AFT output voltage is changed to 0V-12V according to the tuning point, so that the base of the transistor TR receives a comparison voltage between the AFT output voltage and the above-mentioned 6.2V-7V reference voltage. do. Accordingly, the driving of the transistor TR is controlled by the base voltage of the transistor TR, whereby the amount of current flowing through the collector of the transistor TR, that is, the resistor R 5 is controlled, thereby adjusting the tuning unit 4. The voltage applied to the internal tuning volume VR is automatically adjusted. As a result, the tuning range of the tuner is extended, so that the user can conveniently select a channel.
이상과 같이 본 고안은 AFT 전압입력단자를 보유하지 않는 튜너의 튜닝조작시에 그 튜닝범위를 확대시켜 사용자가 원하는 채널을 손쉽게 세팅할 수 있는 잇점이 있다.As described above, the present invention has an advantage of allowing the user to easily set a desired channel by extending the tuning range during the tuning operation of the tuner not having the AFT voltage input terminal.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850012482U KR890001089Y1 (en) | 1985-09-25 | 1985-09-25 | Television tunner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850012482U KR890001089Y1 (en) | 1985-09-25 | 1985-09-25 | Television tunner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR870006002U KR870006002U (en) | 1987-04-25 |
| KR890001089Y1 true KR890001089Y1 (en) | 1989-03-28 |
Family
ID=19245535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019850012482U KR890001089Y1 (en) | 1985-09-25 | 1985-09-25 | Television tunner |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR890001089Y1 (en) |
-
1985
- 1985-09-25 KR KR2019850012482U patent/KR890001089Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR870006002U (en) | 1987-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3813615A (en) | Local oscillator for television tuner having reduced oscillation voltage variation between high and low frequency bands | |
| AU700422B2 (en) | PLL circuit | |
| US4197503A (en) | Circuit arrangement for generating tuning voltage | |
| KR890001089Y1 (en) | Television tunner | |
| JPH0724813Y2 (en) | Voltage superposition circuit of electronic tuning tuner | |
| US3934191A (en) | Circuit arrangement for generating a stabilized direct voltage with superposition of a control voltage | |
| US4182991A (en) | Channel selecting apparatus for use with plural tuning devices | |
| US4171492A (en) | Temperature compensated zener diode arrangement | |
| KR850001672Y1 (en) | Tunning voltage supply for tv tunner | |
| KR850001673Y1 (en) | Tv tunner band changing circuit | |
| JPS5942759Y2 (en) | Tuning device for electronic tuner | |
| KR850001671Y1 (en) | Tunning voltage supply for tv tunner | |
| KR890008438Y1 (en) | A switchover apparatus of tunning signal | |
| KR850001125B1 (en) | Tv tunner bend charging circuit | |
| JPS6123884Y2 (en) | ||
| JPS6010117Y2 (en) | AFT control circuit | |
| JPS5942758Y2 (en) | Tuning device for electronic tuner | |
| US4144512A (en) | AFC voltage superimposing circuit for electronic tuner | |
| KR900003704Y1 (en) | Auto tunning memory circuit of pll tuner | |
| KR910001651Y1 (en) | Aft variable range stabilizing circuit for electronic tuner | |
| KR0164561B1 (en) | Three input-1 output divider | |
| JPH026674Y2 (en) | ||
| JPH0238508Y2 (en) | ||
| KR890002425Y1 (en) | Channel selecting circuit of television | |
| JPS6138287Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E701 | Decision to grant or registration of patent right | ||
| REGI | Registration of establishment | ||
| FPAY | Annual fee payment |
Payment date: 19970220 Year of fee payment: 9 |
|
| LAPS | Lapse due to unpaid annual fee |