JPS6127230Y2 - - Google Patents
Info
- Publication number
- JPS6127230Y2 JPS6127230Y2 JP15590278U JP15590278U JPS6127230Y2 JP S6127230 Y2 JPS6127230 Y2 JP S6127230Y2 JP 15590278 U JP15590278 U JP 15590278U JP 15590278 U JP15590278 U JP 15590278U JP S6127230 Y2 JPS6127230 Y2 JP S6127230Y2
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- tape recorder
- radio
- receiving
- reception
- 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.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 108010062804 fibroblast migration inhibitory factor Proteins 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Landscapes
- Superheterodyne Receivers (AREA)
- Circuits Of Receivers In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
【考案の詳細な説明】
本考案はFM受信時中間周波（IF）増幅用、
AM受信時コンバーター用として動作するトラン
ジスタを有するAM−FMラジオ受信部を備えた
FM−AMラジオ付テープレコーダに関するもの
である。[Detailed explanation of the invention] This invention is for intermediate frequency (IF) amplification during FM reception.
Equipped with an AM-FM radio receiver with a transistor that operates as a converter when receiving AM.
This invention relates to a tape recorder with an FM-AM radio.
第１図は斯種FM−AMラジオ付テープレコー
ダの従来例を示す回路図で、第１図に於いて使用
されている部品は下記の通りである。 FIG. 1 is a circuit diagram showing a conventional example of this type of tape recorder with FM-AM radio, and the parts used in FIG. 1 are as follows.
T1はFM用IFT、T2はAM用IFT、Tr1はFMIF
増幅とAMコンバーターを兼ねるトランジスタ、
CF1はFM用セラミツクフイルタ、L1はAM用ア
ンテナコイル、L2はAM用発振コイル、C1はFM
用デカツプリングコンデンサ、C2はFM時Tr1の
ベースバイパス用コンデンサ、C3はAM注入用兼
FM受信時のトランジスタTr1のエミツタバイパ
ス用コンデンサ、VC1はAMアンテナ側バリコ
ン、VC2はAM発振側バリコン、R1はトランジス
タTr1のベースバイアス制御（ブースト）用抵
抗、R2はトランジスタTr1のベースバイアス用抵
抗、R3はトランジスタTr1のエミツタバイアス用
抵抗、ベースR4はAM時の大入力歪、大入力笛音
防害改善用兼AM注入容量平滑用抵抗、R5はトラ
ンジスタTr1のコレクタバイアス、及びセラミツ
クフイルタCF1とのマツチング用抵抗、R6はセラ
ミツクフイルタCF1の出力側マツチング用及び
AM用IFTT2との結合用抵抗、S1、S2はフアンク
シヨン切換スイツチである。 T 1 is IFT for FM, T 2 is IFT for AM, Tr 1 is FMIF
Transistor that doubles as amplification and AM converter,
CF 1 is ceramic filter for FM, L 1 is antenna coil for AM, L 2 is oscillation coil for AM, C 1 is FM
C2 is a base bypass capacitor for Tr 1 during FM, C3 is also used for AM injection.
Emitter bypass capacitor of transistor Tr 1 during FM reception, VC 1 is the AM antenna side variable capacitor, VC 2 is the AM oscillation side variable capacitor, R 1 is the base bias control (boost) resistor of transistor Tr 1 , R 2 is the transistor The base bias resistor of Tr 1 , R 3 is the emitter bias resistor of transistor Tr 1 , the base R 4 is the resistor for AM injection large input distortion, large input whistling sound damage prevention and AM injection capacitance smoothing resistor, R 5 is the collector bias of the transistor Tr1 and the matching resistor with the ceramic filter CF1 , and R6 is the resistor for matching the output side of the ceramic filter CF1 .
Resistors S 1 and S 2 for coupling with AM IFTT 2 are function changeover switches.
次に第１図の回路の動作について説明する。 Next, the operation of the circuit shown in FIG. 1 will be explained.
切換スイツチS1により、FM受信時にはAM用
アンテナコイルL1の２次側巻線I1を開放してトラ
ンジスタTr1へのAM信号の伝達を阻止し、エミ
ツタバイパス用コンデンサC3を直接アースして
高利得を保持している。又AM受信時にはアンテ
ナコイルL1の２次側巻線I1をアースしてアンテナ
コイルL1に発生したAM信号をトランジスタTr1
のベースに導びくと同時に、トランジスタTr1の
エミツタにはAM用発振コイルL2より抵抗R4、コ
ンデンサC3を介して注入電圧を印加し、トラン
ジスタTr1をAMコンバーターとして動作させて
いる。 When receiving FM, the selector switch S1 opens the secondary winding I1 of the AM antenna coil L1 to block transmission of the AM signal to the transistor Tr1 , and directly grounds the emitter bypass capacitor C3. and hold high gains. Also, when receiving AM, the secondary winding I1 of the antenna coil L1 is grounded and the AM signal generated in the antenna coil L1 is connected to the transistor Tr1.
At the same time, an injection voltage is applied to the emitter of transistor Tr 1 from AM oscillation coil L 2 via resistor R 4 and capacitor C 3 , thereby operating transistor Tr 1 as an AM converter.
更に切換スイツチS2により、FM受信時には交
流的にアースされた電源供給線路１からFMフロ
ントエンド２に電源が供給される様に、又AM受
信時にはトランジスタTr1の負荷抵抗R5をシヨー
トさせる様にしている。 Furthermore, the changeover switch S 2 is configured to supply power to the FM front end 2 from the AC grounded power supply line 1 during FM reception, and to short the load resistor R 5 of transistor Tr 1 during AM reception. I have to.
然しながらテープレコーダ動作時、AMコンバ
ーター用トランジスタTr1にコレクタ負荷抵抗R5
が接続されているため、FM及びAMラジオ放送
の大入力信号がテープ系信号伝送路（図示せず）
に混入し妨害を与えていた。又この様な妨害を防
止するためには、従来テープレコーダ動作時ラジ
オ部に電源が供給されないようにするためのラジ
オ−テープの電源切換用スイツチを別途必要とし
ていた。 However, when the tape recorder is operating, the AM converter transistor Tr 1 has a collector load resistance R 5 .
is connected, large input signals of FM and AM radio broadcasts are transmitted through the tape system signal transmission path (not shown).
was mixed in and caused interference. In order to prevent such interference, it has conventionally been necessary to provide a separate radio-tape power switch to prevent power from being supplied to the radio unit when the tape recorder is in operation.
本考案は斯る点に鑑み、少ないスイツチ回路数
でテープレコーダ動作時殊に録音作時にFM及び
AMラジオ放送の大入力信号による誤録音等の悪
影響を防止するようにしたFM−AMラジオ付テ
ープレコーダを提供せんとするもので、以下本考
案の一実施例を第２図に従い説明する。 In view of this, the present invention uses a small number of switch circuits to operate FM and tape recorders, especially during recording.
It is an object of the present invention to provide a tape recorder with an FM-AM radio that is designed to prevent adverse effects such as erroneous recording due to large input signals of AM radio broadcasts.An embodiment of the present invention will be described below with reference to FIG.
尚第２図に於いて、第１図と同一の部品につい
ては第１図と同一の図番を付すことにする。 In FIG. 2, parts that are the same as those in FIG. 1 are given the same numbers as in FIG.
本考案は第２図に示す様に、フアンクシヨン切
換スイツチS1′のテープレコーダ側端子
（TAPF）をトランジスタTr1のコレクタに接続
し、テープレコーダ動作時にはトランジスタTr1
のコレクタをアース線路１に接続してシヨートさ
せる様にしたことを特徴としている。 As shown in Figure 2, the present invention connects the tape recorder side terminal (TAPF) of the function changeover switch S1 ' to the collector of the transistor Tr1 , and when the tape recorder operates, the transistor Tr1
The collector is connected to the ground line 1 and shot.
本考案のFM−AMラジオ付テープレコーダは
斯様に構成されているので、テープレコーダ動作
時にFMフロントエンド２及びトランジスタTr1
で発生するノイズ信号が中間周波増幅回路３以降
の回路に伝達されるのを防止出来る。 Since the tape recorder with FM-AM radio of the present invention is configured in this way, the FM front end 2 and transistor Tr 1 are connected to each other during tape recorder operation.
It is possible to prevent the noise signal generated in the intermediate frequency amplifier circuit 3 from being transmitted to the circuits after the intermediate frequency amplification circuit 3.
以上の様に本考案に係るFM−AMラジオ付テ
ープレコーダは、FM受信時中間周波増幅用、
AM受信時コンバーター用に共用するトランジス
タのコレクタをテープ動作時フアンクシヨン切換
スイツチにてシヨートさせる様にしたので、テー
プレコーダ動作時ラジオ部に電源が供給されてい
ても、又強電界地域で使用用してもラジオ放送音
の漏れは起こらない。従つてラジオ−テープの電
源切換用スイツチを別途設けなくても、テープレ
コーダ動作時にFM及びAMラジオ放送の大入力
信号による悪影響が発生するのを防止することが
出来る。 As described above, the tape recorder with FM-AM radio according to the present invention is for intermediate frequency amplification when receiving FM,
The collector of the transistor shared by the converter during AM reception is switched off by the function selector switch during tape operation, so even if power is supplied to the radio unit when the tape recorder is operating, it can also be used in areas with strong electric fields. However, the radio broadcast sound will not leak. Therefore, it is possible to prevent the adverse effects of large input signals of FM and AM radio broadcasts from occurring during tape recorder operation without separately providing a radio tape power supply switch.
第１図は従来のFM−AMラジオ付テープレコ
ーダを示す回路図、第２図は本考案に係るFM−
AMラジオ付テープレコーダを示す回路図であ
る。
Tr1……トランジスタ、C3……コンデンサ、L1
……AM用アンテナコイル、I1……AM用アンテ
ナコイルの２次巻線、R1……ベースバイアスブ
ースト用抵抗、R5……コレクタ負荷抵抗、S1′，
S2′……第１第２のフアンクシヨン切換スイツ
チ、１……交流的にアースされた電源供給線路。
Figure 1 is a circuit diagram showing a conventional FM-AM tape recorder with radio, and Figure 2 is an FM-AM radio tape recorder according to the present invention.
FIG. 2 is a circuit diagram showing a tape recorder with an AM radio. Tr 1 ...transistor, C 3 ...capacitor, L 1
...AM antenna coil, I 1 ...AM antenna coil secondary winding, R 1 ...Base bias boost resistance, R 5 ...Collector load resistance, S 1 ′,
S 2 ′...First and second function changeover switch, 1... AC grounded power supply line.
Claims (1)
幅用、AM受信時コンバーター用として共用す
るようにしたFM−AMラジオ付テープレコー
ダに於いて、FM受信時前記トランジスタのエ
ミツタバイパス用コンデンサを、又AM受信時
AM用高周波同調コイルの２次側巻線のアース
側を夫々交流的にアースされた電源供給線路に
接続し、且つテープレコーダ動作時に前記トラ
ンジスタのコレクタをシヨートさせる第１のフ
アンクシヨン切換スイツチと、FM受信時前記
トランジスタのベースバイアス制御用抵抗を前
記電源供給線路に接続し、且つAM受信時前記
トランジスタのコレクタ負荷抵抗をシヨートさ
せる第２のフアンクシヨン切換スイツチとを設
けてなるFM−AMラジオ付テープレコーダ。 (2) AM用高周波同調コイルは、AM用アンテナ
コイルであることを特徴とする実用新案登録請
求の範囲第１項記載のFM−AMラジオ付テー
プレコーダ。[Claims for Utility Model Registration] (1) In a tape recorder with an FM-AM radio in which one transistor is used for intermediate frequency amplification when receiving FM and for converting when receiving AM, The emitter bypass capacitor is also used when receiving AM.
a first function changeover switch that connects the ground sides of the secondary windings of the high frequency tuning coils for AM to AC grounded power supply lines, and that shoots the collector of the transistor when the tape recorder is operating; A tape recorder with an FM-AM radio, which is provided with a second function changeover switch that connects a base bias control resistor of the transistor to the power supply line during AM reception, and switches off the collector load resistance of the transistor during AM reception. . (2) The tape recorder with FM-AM radio according to claim 1, wherein the AM high-frequency tuning coil is an AM antenna coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15590278U JPS6127230Y2 (en) | 1978-11-10 | 1978-11-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15590278U JPS6127230Y2 (en) | 1978-11-10 | 1978-11-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5572293U JPS5572293U (en) | 1980-05-19 |
| JPS6127230Y2 true JPS6127230Y2 (en) | 1986-08-14 |
Family
ID=29145371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15590278U Expired JPS6127230Y2 (en) | 1978-11-10 | 1978-11-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6127230Y2 (en) |
-
1978
- 1978-11-10 JP JP15590278U patent/JPS6127230Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5572293U (en) | 1980-05-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB2071920A (en) | Aerial circuit | |
| US3919645A (en) | AM/FM radio receiver | |
| EP0269924B1 (en) | Compensation amplifier for an automobile antenna | |
| US3748581A (en) | Multi-mode detector circuit | |
| JPS6127230Y2 (en) | ||
| US5003620A (en) | Tuner circuit and receiving band change-over circuit with a push-pull amplifier | |
| JPH0227628Y2 (en) | ||
| JPS6241460Y2 (en) | ||
| JPS597783Y2 (en) | FM↓-AM receiver | |
| JPS622815Y2 (en) | ||
| JPS5846592Y2 (en) | AM-FM radio receiver band switching circuit | |
| JPS5846591Y2 (en) | Band switching circuit for AM-FM radio receiver with tape recorder | |
| JPS6127228Y2 (en) | ||
| JPS6211090Y2 (en) | ||
| JP3107503B2 (en) | Double superheterodyne AM radio receiver | |
| JPH046274Y2 (en) | ||
| JPS6311776Y2 (en) | ||
| JPH051132Y2 (en) | ||
| JP2814248B2 (en) | High frequency amplifier | |
| US3528013A (en) | Dual frequency intermediate-frequency coupling circuit | |
| JPS6216044Y2 (en) | ||
| US3497811A (en) | Intermediate-frequency coupling circuit | |
| JPS6110371Y2 (en) | ||
| JPS6244602Y2 (en) | ||
| JPS5936072Y2 (en) | Input filter switching circuit |