JPS6224540U - - Google Patents
Info
- Publication number
- JPS6224540U JPS6224540U JP11484885U JP11484885U JPS6224540U JP S6224540 U JPS6224540 U JP S6224540U JP 11484885 U JP11484885 U JP 11484885U JP 11484885 U JP11484885 U JP 11484885U JP S6224540 U JPS6224540 U JP S6224540U
- Authority
- JP
- Japan
- Prior art keywords
- band
- terminal
- switching
- output
- band selection
- Prior art date
- 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.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Circuits Of Receivers In General (AREA)
Description
第１図は本考案にかかるバンド切替装置のブロ
ツク図、第２図は従来のバンド切替装置のブロツ
ク図である。
１１……デジタルチユーニングＩＣ回路、１２
……信号入力部、ＳＷＢ……バンド選択スイツチ
、ＴＲ３〜ＴＲ３……トランジスタ、Ｄａ〜Ｄｆ
……ダイオード、Ｒ０〜Ｒ３……抵抗、ＢＳ……
バイアス手段、ＬＢＳ……ローバンド選択信号、
ＭＢＳ……中間バンド選択信号、ＦＢＳ……ＦＭ
バンド選択信号。
FIG. 1 is a block diagram of a band switching device according to the present invention, and FIG. 2 is a block diagram of a conventional band switching device. 11...Digital tuning IC circuit, 12
...Signal input section, SWB...Band selection switch, TR3-TR3...Transistor, Da-Df
...Diode, R0~R3...Resistance, BS...
Bias means, LBS...Low band selection signal,
MBS...Intermediate band selection signal, FBS...FM
Band selection signal.
Claims (1)
が接続された時第１のバンド切替出力端子からロ
ーバンド選択信号を出力し、 第１の端子とバンド切替用の第２の入力端子間
が接続された時第２のバンド切替出力端子から中
間バンド選択信号を出力し、 第１の端子とバンド切替用の第３の入力端子間
が接続された時第３のバンド切替出力端子からＦ
Ｍバンド選択信号を出力するデジタルチユーニン
グ回路を有するバンド切替装置において、 １つのバンド選択スイツチを設けると共に、 前記第１の端子とバンド切替用の第１の入力端
子間、第１の端子とバンド切替用の第２の入力端
子間、第１の端子とバンド切替用の第３の入力端
子間にそれぞれスイツチング用のトランジスタを
設け、 前記各トランジスタのベース端子と片側がアー
スされた前記バンド選択スイツチ間を抵抗を介し
て接続すると共に、各抵抗とバンド選択スイツチ
の接続点をバイアスするバイアス手段を設け、 前記各出力端子から出力されるバンド選択信号
により選択されるバンドの次に前記バンド選択ス
イツチの操作で選択されるバンドに応じたトラン
ジスタ以外のトランジスタのベースに各出力端子
をダイオードを介して接続してなることを特徴と
するバンド切替装置。[Claims for Utility Model Registration] When the first terminal and the first input terminal for band switching are connected, a low band selection signal is output from the first band switching output terminal, and the first terminal and the band switching When the second input terminal for band switching is connected, the intermediate band selection signal is output from the second band switching output terminal, and when the first terminal and the third input terminal for band switching are connected, the intermediate band selection signal is output. F from the band switching output terminal of 3
In a band switching device having a digital tuning circuit that outputs an M band selection signal, one band selection switch is provided, and between the first terminal and a first input terminal for band switching, and between the first terminal and the band selection switch. A switching transistor is provided between the second input terminal for switching and between the first terminal and the third input terminal for band switching, respectively, and the base terminal of each transistor and one side of the band selection switch are grounded. and biasing means for biasing the connection point between each resistor and the band selection switch through a resistor, and the band selection switch is connected next to the band selected by the band selection signal output from each of the output terminals. A band switching device characterized in that each output terminal is connected via a diode to the base of a transistor other than the transistor corresponding to the band selected by the operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11484885U JPS6224540U (en) | 1985-07-26 | 1985-07-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11484885U JPS6224540U (en) | 1985-07-26 | 1985-07-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6224540U true JPS6224540U (en) | 1987-02-14 |
Family
ID=30997957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11484885U Pending JPS6224540U (en) | 1985-07-26 | 1985-07-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6224540U (en) |
-
1985
- 1985-07-26 JP JP11484885U patent/JPS6224540U/ja active Pending
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