KR890000226Y1 - Tuning displaying device - Google Patents
Tuning displaying device Download PDFInfo
- Publication number
- KR890000226Y1 KR890000226Y1 KR2019850017678U KR850017678U KR890000226Y1 KR 890000226 Y1 KR890000226 Y1 KR 890000226Y1 KR 2019850017678 U KR2019850017678 U KR 2019850017678U KR 850017678 U KR850017678 U KR 850017678U KR 890000226 Y1 KR890000226 Y1 KR 890000226Y1
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- South Korea
- Prior art keywords
- tuning
- transistor
- terminal
- indicator
- time
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- 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.)
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/02—Indicating arrangements
- H03J1/04—Indicating arrangements with optical indicating means
- H03J1/045—Indication of the tuning band, the bandwidth, tone control, the channel number, the frequency, or the like
- H03J1/047—Indication of the tuning band, the bandwidth, tone control, the channel number, the frequency, or the like using electronic means, e.g. LED's
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- Circuits Of Receivers In General (AREA)
Abstract
내용 없음.No content.
Description
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 : 중간주파증폭기 Q1~Q3: 트랜지스터1: intermediate frequency amplifier Q 1 ~ Q 3 : transistor
LED : 발광다이오드 C1, C2: 콘덴서LED: Light emitting diode C 1 , C 2 : Condenser
R1~R6: 저항 SW : AM/FM : 절환스위치R 1 to R 6 : Resistance SW: AM / FM: Switch
본 고안은 동조표시기의 구동시간 조절회로에 관한 것으로, 특히, AM과 FM공용의 중간주파 증폭기를 구비하고 있는 음향기기에서 동조표시기의 구동에 소요되는 시간을 AM/FM에 따라 조절해주도록 된 동조 표시기의 구동시간 조절회로에 관한 것이다.The present invention relates to a driving time control circuit of a tuning display. In particular, in an acoustic device having an intermediate frequency amplifier for AM and FM, tuning of the tuning display according to AM / FM is performed. A driving time control circuit of an indicator is provided.
일반적으로 AM/FM음향기기에서 소정주파수에 동조되면 그 동조상태를 표시해주는 예컨데 발광다이오드로 구성된 동조표시기가 구비되어 동조상태를 표시해 주도록 되어 있는바 이러한 동죠표시기를 사용하여 AM이나 FM수신상태에 대한 동조를 표시해주는 경우 AM과 FM에 대한 중간주파증폭기를 공용으로 사용하고 있기 때문에 AGC동작의 안정화를 위해서는 외부에서 구동시간을 조절해 주어야만 되는바, 이 경우에 AM은 동조영역이 넓은 반면, FM은 동조영역이 좁기 때문에 AM과 FM에 대한 동조표시기를 동일한 시간조건으로 구동시키는 회로를 사용하면 FM방송에 대한 동조상태를 표시해주기 위한 동조표시기의 구동(점등)에 비교적 긴시간이 지연되게 되므로 이러한 동조표시기는 FM의 동조상태를 표시해 주는데 효과적으로 기여할 수 없었다.In general, when the AM / FM audio equipment is tuned to a certain frequency, it displays the tuning status. For example, a tuning indicator composed of light emitting diodes is provided to display the tuning status. In the case of displaying the tuning, the intermediate frequency amplifier for AM and FM is used in common, so in order to stabilize the AGC operation, the driving time must be adjusted externally. In this case, the AM has a large tuning range, whereas FM Since the tuning area is narrow, using a circuit that drives the tuning indicators for AM and FM in the same time condition causes a relatively long time delay in driving (turning on) the tuning indicator for displaying the tuning status for FM broadcasting. The indicator could not effectively contribute to indicating the FM's synchronization.
본 고안은 상기와 같은 종래의 동조표시기의 구동회로에서 나타나고 있는 결점을 개선한 것으로서, AM의 동조 상태를 표시해주는 동조표시기의 구동에 걸리는 시간보다 FM의 동조상태를 표시해주기 위한 동조표시기의 구동에 걸리는 시간을 짧게 해줌으로써 AM 또는 FM수신기의 동조상태를 효과적으로 나타낼 수 있도록 된 동조표시기의 구동시간 조절회로를 제공하고자 함에 그 목적이 있다.The present invention improves the deficiencies in the conventional driving circuit of the tuning indicator as described above, and it is possible to drive the tuning indicator for displaying the tuning status of FM rather than the time taken for driving the tuning indicator for displaying the tuning status of AM. It is an object of the present invention to provide a driving time control circuit of a tuning indicator which can effectively indicate the tuning state of an AM or FM receiver by shortening the time taken.
이하 본 고안의 구성 및 작용, 효과를 예시 도면에 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 소정주파수에 동조되면 하이레벨의 전압이 출력되는 중간주파 증폭기(1)의 단자(A)에는 AM/FM절환스위치(SW)의 절환에 따라 AM/FM동조시에 시정수를 결정해주는 저항(R1)과 콘덴서(C1, C2) 및 AM동조시에만 도통상태로 되는 트랜지스터(Q3)의 컬렉터와 에미터 단자가 연결됨과 더불어, 상기 중간주파 증폭기(1)의 단자(B)에 컬렉터가 접속된 트랜지스터(Q1)의 베이스와 연결되고, 이 트랜지스터(Q1)의 에미터에는 저항(R2, R3)을 매개해서 컬랙터단자에 동조표시기로서의 발광다이오드(LED)가 접속된 트랜지스터(Q2)의 베이스가 접속되어 구성되어 있다.The present invention determines the time constant during AM / FM tuning in accordance with the switching of the AM / FM switching switch (SW) at the terminal A of the intermediate frequency amplifier 1 which outputs a high level voltage when tuned to a predetermined frequency. The collector and emitter terminals of the transistor Q3, which are in conduction state only when the resistor R1 and the capacitors C1 and C2 and AM are tuned, are connected, and a collector is connected to the terminal B of the intermediate frequency amplifier 1. the connection to the base of the connection transistor (Q1) and the emitter of the transistor (Q1), the resistance (R 2, R 3) the parameters to emit light as a tuning indicator for local varactor terminal diode (LED) is connected to the transistor (Q2 ) Base is connected.
제1도는 상기와 같이 구성된 본 고안의 회로도를 나타낸 것으로 AM에 대한 동조상태가 표시되는 경우에는 AM/FM절환스위치(SW)가 AM모우드인 단자(R)(S)에 연결되어 공급전원(B+)이 저항(R4)을 통해 트랜지스터(Q3)의 베이스에 인가되어 트랜지스터(Q3)가 턴온된다. 이때 중간주파증폭기(1)의 단자(A)에서는 원하는 주파수에 동조되면 동조에 따른 특정레벨 이상의 하이레벨 전압이 출력되어 상기 하이레벨의 전압에 의해 콘덴서(C1)(C2)가 충전되는데, 이어 여기서 상기 콘덴서(C2)에 대한 충전동작은 트랜지스터(Q3)가 온상태로 되어 접지점이 형성되므로 소정시간동안 충전이 이루어지게 된다. 이어 콘덴서(C1, C2)의 충전이 완료되면 상기한 특정레벨 이상의 전압이 트랜지스터(Q1)의 베이스로 인가되므로 트랜지스터(Q1)가 턴온되어 트랜지스터(Q2)도 턴온되므로 전원(B+)이 저항(R6)을 통해 동조표시기로서의 발광다이오드(LED)에 인가되므로 이 발광다이오드(LED)가 점등되어 AM동조상태를 나타내게 된다. 즉, 상기한 바와 같이 AM동조시의 동조표시기의 구동에 걸리는 시간은 저항(R)과 콘덴서(C1)(C2)의 충전시간으로 결정되게 된다.1 is a circuit diagram of the present invention configured as described above, and when the tuning state for AM is displayed, the AM / FM switching switch SW is connected to the terminal R (S), which is an AM mode, to supply the power supply B. + Is applied to the base of transistor Q 3 through resistor R4 to turn transistor Q3 on. At this time, when the terminal A of the intermediate frequency amplifier 1 is tuned to a desired frequency, a high level voltage of a specific level or higher according to the tuning is output, and the capacitors C1 and C2 are charged by the high level voltage. In the charging operation of the capacitor C2, the transistor Q3 is turned on to form a ground point, and thus charging is performed for a predetermined time. Since after the capacitor (C1, C2) when charging is completed, applying to the base of said at least a specific level voltage of the transistor (Q1), so the transistor (Q1) is turned on the transistor (Q2) is also turned on the power (B +) resistance ( Since R6) is applied to the light emitting diode LED as the tuning indicator, the light emitting diode LED is turned on to indicate the AM tuning state. That is, as described above, the time taken to drive the tuning indicator during AM tuning is determined by the charging time of the resistor R and the capacitors C1 and C2.
이와 달리, FM동조시에는 AM/FM절환스위치(SW)가 FM모우드인 단자(R)와 단자(S)가 연결되지 않은 상태로 되어 트랜지스터(Q3)가 턴-오프 된다. 이때 중간주파수 증폭기(1)의 단자(A)에서는 원하는 주파수에 동조되면, AM동조시와 마찬가지로 특정레벨 이상의 전압이 출력되지만, 콘덴서(C2)에서는 트랜지스터(Q3)가 오프되어 있어 접지점이 형성되지 않음에 따라 충전동작이 이루어지지 않고 콘덴서(C1)만 충전된다. 이어 콘덴서(C1)의 충전이 완료되면 트랜지스터(Q1)의 베이스로 특정레벨 이상의 바이어스 전압이 인가되므로 트랜지스터(Q1)가 턴온되고, 이에따라 트랜지스터(Q2)도 턴온되어 전원(B+)이 저항(R6)을 통해 발광다이오드(LED)로 인가되므로 동조표시기로서의 발광다이오드(LED)가 점등되어 FM동조를 나타내게 된다.On the other hand, during FM tuning, the transistor Q3 is turned off because the AM / FM switching switch SW is not connected to the terminal R and the terminal S, which are FM modes. At this time, when the terminal A of the intermediate frequency amplifier 1 is tuned to a desired frequency, a voltage of a certain level or more is output as in AM tuning, but in the capacitor C2, the transistor Q3 is turned off so that no ground point is formed. Accordingly, the charging operation is not performed and only the capacitor C1 is charged. Subsequently, when the charging of the capacitor C1 is completed, a bias voltage of a predetermined level or more is applied to the base of the transistor Q1, so that the transistor Q1 is turned on. Accordingly, the transistor Q2 is turned on, so that the power source B + is turned on by the resistor R6. Since it is applied to the light emitting diode (LED) through), the light emitting diode (LED) as a tuning indicator is turned on to indicate FM tuning.
즉, FM동조시에는 동조표시기의 구동시간이 저항(R1)과 콘덴서(C1)의 시정수에 의해 결정되므로 AM동조시보다 빠르게 동조표시기를 구동시킬 수 있게 된다.That is, during FM tuning, since the driving time of the tuning display is determined by the time constants of the resistor R1 and the capacitor C1, the tuning display can be driven faster than during AM tuning.
즉 동조상태를 표시하는 경우에는 동조표시기로서의 발광다이오드(LED)의 점등시간이 2개의 콘덴서(C1)(C2)에 대한 충전시간으로 결정되는 반면, FM동조상태를 표시해주는 경우에는 발광다이오드(LED)의 점등시간이 1개의 콘덴서(C1)에 의한 충전시간으로 결정되므로, 동조표시기의 점등(구동)에 걸리는 시간은 FM동조시가 AM동조시보다 짧아지게 되어, 신속한 동조표시가 요구되는 FM방송수신시에 신속한 동조표시를 할 수 있게 되는 것이다.That is, in the case of displaying the tuning state, the lighting time of the light emitting diode (LED) as the tuning indicator is determined as the charging time for the two capacitors (C1) and (C2), while in the case of displaying the FM tuning state, the light emitting diode (LED) ) Lighting time is determined by the charging time by one capacitor (C1), so the time required for lighting (driving) of the tuning indicator is shorter than that of AM tuning, and FM broadcasting is required for quick tuning display. At the time of reception, it is possible to display a quick synchronization.
상기한 작용을 하는 본 고안은 FM을 동조시킬 때 AM특성에 영향을 주지 않으면서 동조표시기의 구동에 걸리는 시간을 AM동조시킬 때 보다 짧게 할 수 있게 되므로 FM의 동조상태를 표시해주는 경우에 비교적 쉽게 상태를 표시해 줄 수 있게 되는 장점이 있다.The present invention having the above function makes the time required to operate the tuning indicator shorter than when AM tuning without affecting the AM characteristic when tuning the FM, so it is relatively easy when displaying the tuning status of the FM. It has the advantage of being able to display status.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850017678U KR890000226Y1 (en) | 1985-12-26 | 1985-12-26 | Tuning displaying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850017678U KR890000226Y1 (en) | 1985-12-26 | 1985-12-26 | Tuning displaying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR870011443U KR870011443U (en) | 1987-07-16 |
| KR890000226Y1 true KR890000226Y1 (en) | 1989-03-08 |
Family
ID=19247552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019850017678U Expired KR890000226Y1 (en) | 1985-12-26 | 1985-12-26 | Tuning displaying device |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR890000226Y1 (en) |
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1985
- 1985-12-26 KR KR2019850017678U patent/KR890000226Y1/en not_active Expired
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| Publication number | Publication date |
|---|---|
| KR870011443U (en) | 1987-07-16 |
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