JPS6029225Y2 - Input switching circuit in amplifier - Google Patents
Input switching circuit in amplifierInfo
- Publication number
- JPS6029225Y2 JPS6029225Y2 JP14506079U JP14506079U JPS6029225Y2 JP S6029225 Y2 JPS6029225 Y2 JP S6029225Y2 JP 14506079 U JP14506079 U JP 14506079U JP 14506079 U JP14506079 U JP 14506079U JP S6029225 Y2 JPS6029225 Y2 JP S6029225Y2
- Authority
- JP
- Japan
- Prior art keywords
- input
- amplifier
- volume
- fixed contact
- switching circuit
- 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
Landscapes
- Amplifiers (AREA)
Description
【考案の詳細な説明】 本考案は増幅器における入力切換回路に関する。[Detailed explanation of the idea] The present invention relates to an input switching circuit in an amplifier.
従来、オーディオアンプはチューナー、テープレコーダ
ー等から出力される高レベル信号とレコードプレーヤー
から出力される低レベル信号とを切換える入力切換回路
を具備するが、この入力切換回路は第１図に示すように
、ＴＵＮＥＲ入力、ＴＡＰＥ入力、ＡＵＸ入力及びイコ
ライザアンプ１によって所定のレベルまで増幅したＰＨ
０ＮＯ入力を切換スイッチ２、音量調節用ボリューム３
を通してアンプ４に入力して、各入力を適宜切換えて信
号増幅を行なうようにした構成である。Conventionally, audio amplifiers have been equipped with an input switching circuit that switches between a high-level signal output from a tuner, tape recorder, etc. and a low-level signal output from a record player. , PH amplified to a predetermined level by the TUNER input, TAPE input, AUX input, and equalizer amplifier 1.
0NO input switch 2, volume control 3
The configuration is such that the signal is input to the amplifier 4 through the input signal, and each input is appropriately switched to perform signal amplification.
このような構成において、チューナー、テープレコーダ
ー等はその出力端子に接続される機器（入力切換回路、
アンプ等）の入力抵抗が５０〜１００にΩであるとして
設計されており、従って、上記のような入力切換回路は
その入力抵抗が５０〜１００にΩになるように、音量調
節用ボリューム３の抵抗値５０〜１００ＫΩに設定され
ている。In such a configuration, the tuner, tape recorder, etc. has a device connected to its output terminal (input switching circuit,
Amplifiers, etc.) are designed with an input resistance of 50 to 100 ohms. Therefore, the input switching circuit as described above adjusts the volume control volume 3 so that its input resistance is 50 to 100 ohms. The resistance value is set to 50 to 100KΩ.
このため、切換スイッチ２をＰＨ０ＮＯ入力側に切換え
た場合、アンプ４側からみた信号源抵抗は、ボリューム
３の抵抗値を１００にΩとすると、通常使用頻度の高い
ボリューム位置（中央付近）では２５にΩ（５０にΩの
並列抵抗）となり、この２５にΩの信号源抵抗による熱
雑音が高忠実度の信号増幅が要求されＰＨ０ＮＯ入力時
では問題になっていた。Therefore, when the selector switch 2 is switched to the PH0NO input side, the signal source resistance as seen from the amplifier 4 side is 25Ω at the frequently used volume position (near the center), assuming that the resistance value of the volume 3 is 100Ω. Ω (parallel resistance of 50Ω and Ω), and thermal noise due to the signal source resistance of 25Ω becomes a problem when high-fidelity signal amplification is required and PH0NO input is required.
本考案はこのような従来欠点を改良したもので、以下図
において説明する。The present invention improves on these conventional drawbacks, and will be explained below with reference to the drawings.
第２図において、ＡＵＸ入力、ＴＬＪＮＥＲ入力、ＴＡ
ＰＥ入力を第１の切換スイッチ５の固定接点６ａ、６ｂ
、６ｃにそれぞれ接続し、これらの固定接点から可動接
点７を介して取出した入力を第１の音量調節用ボリュー
ム８を介して上記第１の切換スイッチ５に連動する第２
の切換スイッチ９の一方の固定接点１０ａに接続味この
固定接点から可動接点１１を介してアンプ１２に入カス
る。In Figure 2, AUX input, TLJNER input, TA
The PE input is connected to the fixed contacts 6a and 6b of the first changeover switch 5.
.
It is connected to one fixed contact 10a of the changeover switch 9, and is input to the amplifier 12 from this fixed contact via the movable contact 11.
一方、ＰＨ０ＮＯ入力をイコライザアンプ１３、上記第
１の音量調節用ボリューム８に連動味かつ、この第１の
音量調節用ボリューム８よりも小さい数にΩの抵抗値を
有する第２の音量調節用ボリューム１４を介して上記第
２の切換スイッチ９の他方の固定接点１０ｂに接続し、
この固定接点から可動接点１１を介してアンプ１２に入
力する。On the other hand, the PH0NO input is connected to the equalizer amplifier 13, which is connected to the first volume control volume 8 and has a resistance value of Ω smaller than that of the first volume control volume 8. 14 to the other fixed contact 10b of the second changeover switch 9,
The signal is input from this fixed contact to the amplifier 12 via the movable contact 11.
即ち、ＰＨ０ＮＯ入力専用の入力切換回路及び音量調節
用ボリューム１４を設け、かつ、この音量調節用ボリュ
ーム１４の抵抗値をＡＵＸ入力、ＴＵＮＥＲ入力、ＴＡ
ＰＥ入力の音量調節用ボリューム５の抵抗値より小さく
した構成である。That is, an input switching circuit dedicated to the PH0NO input and a volume control volume 14 are provided, and the resistance value of the volume control volume 14 is set to the AUX input, the TUNER input, and the TA.
This configuration has a resistance value smaller than that of the PE input volume control volume 5.
以上の構成によれば、ＰＨ０ＮＯ入力切換時、アンプ１
２側からみた信号源抵抗はＰＨ０ＮＯ入力専用の第２の
音量調節用ボリューム１４の抵抗値によって定まり、通
常使用頻度の高いボリューム位置（中央付近）において
も高々数にΩの小さい抵抗値であるので、この信号源抵
抗による熱雑音がほとんど問題にならない程度になり、
高Ｓ／Ｎ比でＰＨ０ＮＯ入力時の信号増幅ができる。According to the above configuration, when switching the PH0NO input, the amplifier 1
The signal source resistance seen from the 2 side is determined by the resistance value of the second volume control volume 14 dedicated to the PH0NO input, and even at the frequently used volume position (near the center), it has a small resistance value of several Ω at most. , the thermal noise caused by this signal source resistance becomes almost insignificant,
High S/N ratio allows signal amplification when inputting PH0NO.
言い換えれば、高Ｓ／Ｎ比イコライザアンプ１３の性能
を十二分に発揮できる。In other words, the performance of the high S/N ratio equalizer amplifier 13 can be fully demonstrated.
また、ＡＵＸ入力、ＴＵＮＥＲ入力及びＴＡＰＥ入力は
高低抗値の音量調節用ボリューム８を介してアンプ１２
に入力されるので、従来と同様に高忠実度の信号増幅が
できる。In addition, the AUX input, TUNER input, and TAPE input are connected to the amplifier 12 via a volume control volume 8 with high and low resistance values.
Since the input signal is input to the input signal, high-fidelity signal amplification can be performed in the same manner as before.
尚、本考案は要するに、ＰＨ０ＮＯ入力専用の音量調節
用ボリューム及び入力切換回路を設けた構成を特徴とす
るものであるから、第１、第２の音量調節用ボリューム
８，１４は必ずしも連動する必要はない。In short, the present invention is characterized by a configuration in which a volume control volume dedicated to the PH0NO input and an input switching circuit are provided, so the first and second volume control volumes 8 and 14 do not necessarily need to be linked together. There isn't.
以上のように、本考案はＰＨ０ＮＯ入力専用の音量調節
用ボリューム及び入力切換回路を設けたので、ＰＨ０Ｎ
Ｏ入力切換時高Ｓ／Ｎ比で信号増幅ができる優れた利点
を有する。As described above, the present invention has a dedicated volume control volume and input switching circuit for PH0NO input, so PH0NO
It has the excellent advantage of being able to amplify signals with a high S/N ratio when switching the O input.
第１図は従来の入力切換回路の構成を示す図、第２図は
本考案の入力切換回路の構成を示す図である。
５は第１の切換スイッチ、６ａ、６ｂ、６ｃは固定接点
、７は可動接点、８は音量調節用ボリューム、９は第２
の切換スイッチ、１０ａは固定接点、１１は可動接点、
１２はアンプ、１３はイコライザアンプ、１４は音量調
節用ボリューム、１０ｂは固定接点である。FIG. 1 is a diagram showing the configuration of a conventional input switching circuit, and FIG. 2 is a diagram showing the configuration of the input switching circuit of the present invention. 5 is a first changeover switch, 6a, 6b, 6c are fixed contacts, 7 is a movable contact, 8 is a volume for adjusting the volume, 9 is a second
changeover switch, 10a is a fixed contact, 11 is a movable contact,
12 is an amplifier, 13 is an equalizer amplifier, 14 is a volume for adjusting the volume, and 10b is a fixed contact.
Claims (1)
ル入力を第１の切換スイッチ５の固定接点６ａ？ ６
ｂ、６ｃにそれぞれ接続し、当該固定接点から可動接点
７、第１の音量調節用ボリューム８を介して上記第１の
切換スイッチ５に連動する第２の切換スイッチ９の一方
の固定接点１０ａに接続し、当該固定接点から可動接点
１１を介してアンプ１２に入力すると共に、ＰＨ０ＮＯ
入力をイコライザアンプ１３、上記第１の音量調節用ボ
リューム８より小さな抵抗値を有する第２の音量調節用
ボリューム１４を介して上記第２の切換スイッチ９の他
方の固定接点１０ｂに接続した増幅器における入力切換
回路。High level inputs such as AUx input, TUNER input, TAPE input etc. are connected to the fixed contact 6a of the first selector switch 5. 6
b and 6c, respectively, and from the fixed contact to one fixed contact 10a of the second changeover switch 9 that is linked to the first changeover switch 5 via the movable contact 7 and the first volume control volume 8. and input from the fixed contact to the amplifier 12 via the movable contact 11.
In an amplifier whose input is connected to the other fixed contact 10b of the second changeover switch 9 via an equalizer amplifier 13 and a second volume control volume 14 having a smaller resistance value than the first volume control volume 8. Input switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14506079U JPS6029225Y2 (en) | 1979-10-19 | 1979-10-19 | Input switching circuit in amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14506079U JPS6029225Y2 (en) | 1979-10-19 | 1979-10-19 | Input switching circuit in amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5663113U JPS5663113U (en) | 1981-05-27 |
| JPS6029225Y2 true JPS6029225Y2 (en) | 1985-09-04 |
Family
ID=29376237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14506079U Expired JPS6029225Y2 (en) | 1979-10-19 | 1979-10-19 | Input switching circuit in amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6029225Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6055113U (en) * | 1983-09-22 | 1985-04-18 | オンキヨー株式会社 | Amplifier input switching device |
-
1979
- 1979-10-19 JP JP14506079U patent/JPS6029225Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5663113U (en) | 1981-05-27 |
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