JPS5882053U - Local oscillation circuit switching device - Google Patents
Local oscillation circuit switching deviceInfo
- Publication number
- JPS5882053U JPS5882053U JP17705181U JP17705181U JPS5882053U JP S5882053 U JPS5882053 U JP S5882053U JP 17705181 U JP17705181 U JP 17705181U JP 17705181 U JP17705181 U JP 17705181U JP S5882053 U JPS5882053 U JP S5882053U
- Authority
- JP
- Japan
- Prior art keywords
- local oscillation
- oscillation
- coil
- oscillation circuit
- switching device
- 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
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来の切換装置を備えた局部発振回路の電気回
路図、第２図は本考案に係る切換装置の一実施例を備え
た局部発振回路の電気回路図、第３図は同上発振回路の
中波受信時の動作、説明図である。
１．２：第１（第、２）の発振回路、Ｌ１０＋ ”２０
：局部発振コイル、ＴＣｌｏ、ＴＣ２ｏニトリマーコン
デンサ、ＶＣ：バリコン、Ｑｌｓ Ｑ２”スイッチング
素子。Fig. 1 is an electrical circuit diagram of a local oscillation circuit equipped with a conventional switching device, Fig. 2 is an electrical circuit diagram of a local oscillation circuit equipped with an embodiment of the switching device according to the present invention, and Fig. 3 is an electrical circuit diagram of a local oscillation circuit equipped with an embodiment of the switching device according to the present invention. FIG. 3 is an explanatory diagram of the operation of the circuit during medium wave reception. 1.2: First (second, second) oscillation circuit, L10+ "20
:Local oscillation coil, TClo, TC2o nitrimer capacitor, VC: variable capacitor, Qls Q2'' switching element.
Claims (1)
並列回路から成る第１の発振回路部１の一端をアースす
ると共に他端を局部発振コイルＬ２０とトリマーコンデ
ンサＴｃ２０の並列回路から成る第２の発振回路部２の
一端に接続し、かつ上記局部発振コイルし２ｏとトリマ
ーコンデンサＴｃ２ｏの各他端は夫々アースすると共に
上記両発振回路部１及び２にはバリコンＶＣを共通して
設け、かつ、上記各発振回路部１及び２にはスイッチ信
号に応じてオン・オフするスイッチング素子Ｑ、、 Ｑ
２を設けて成り、該スイッチング素子Ｑ□がオンすると
上記局部発振コイルし□。及びＬ２０が並列接続されて
発振動作をして第１の局部発振周波数を出力し、又、上
記スイッチング素子Ｑ２がオンすると上記局部発振コイ
ルし２０が発振動作をして第２の局部発振周波数を出力
するようにした事を特徴とする局部発振回路の切換装置
。A first oscillation circuit section 1 consisting of a parallel circuit of a local oscillation coil L10 and a trimmer capacitor TC1° is grounded at one end, and the other end is connected to a second oscillation circuit section 2 consisting of a parallel circuit of a local oscillation coil L20 and a trimmer capacitor Tc20. The other ends of the local oscillation coil 2o and the trimmer capacitor Tc2o are connected to one end, and the other ends of the local oscillation coil 2o and the trimmer capacitor Tc2o are respectively grounded, and a variable capacitor VC is provided in common to both the oscillation circuit sections 1 and 2, and each of the oscillation circuits Sections 1 and 2 include switching elements Q, Q, which turn on and off according to switch signals.
2, and when the switching element Q□ is turned on, the local oscillation coil □ is turned on. and L20 are connected in parallel to perform an oscillation operation and output a first local oscillation frequency, and when the switching element Q2 is turned on, the local oscillation coil 20 performs an oscillation operation and outputs a second local oscillation frequency. A switching device for a local oscillation circuit, characterized in that it outputs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17705181U JPS5882053U (en) | 1981-11-27 | 1981-11-27 | Local oscillation circuit switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17705181U JPS5882053U (en) | 1981-11-27 | 1981-11-27 | Local oscillation circuit switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5882053U true JPS5882053U (en) | 1983-06-03 |
Family
ID=29970578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17705181U Pending JPS5882053U (en) | 1981-11-27 | 1981-11-27 | Local oscillation circuit switching device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5882053U (en) |
-
1981
- 1981-11-27 JP JP17705181U patent/JPS5882053U/en active Pending
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