JP2533630Y2 - Tape recorder circuit - Google Patents

Tape recorder circuit

Info

Publication number
JP2533630Y2
JP2533630Y2 JP17372285U JP17372285U JP2533630Y2 JP 2533630 Y2 JP2533630 Y2 JP 2533630Y2 JP 17372285 U JP17372285 U JP 17372285U JP 17372285 U JP17372285 U JP 17372285U JP 2533630 Y2 JP2533630 Y2 JP 2533630Y2
Authority
JP
Japan
Prior art keywords
circuit
motor
tape recorder
voltage source
power switch
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 - Lifetime
Application number
JP17372285U
Other languages
Japanese (ja)
Other versions
JPS6283207U (en
Inventor
広行 吉田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Tottori Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tottori Sanyo Electric Co Ltd, Sanyo Electric Co Ltd filed Critical Tottori Sanyo Electric Co Ltd
Priority to JP17372285U priority Critical patent/JP2533630Y2/en
Publication of JPS6283207U publication Critical patent/JPS6283207U/ja
Application granted granted Critical
Publication of JP2533630Y2 publication Critical patent/JP2533630Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)

Description

【考案の詳細な説明】 (イ)産業上の利用分野 本考案は増幅回路へのモーターノイズ混入を防止した
テープレコーダー回路に関する。
DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a tape recorder circuit that prevents motor noise from entering an amplifier circuit.

(ロ)従来の技術 従来、テープレコーダー回路においては実公昭60-170
44号公報に示されているように、テープレコーダーの駆
動用モーターと増幅回路への動作電圧供給は並列であ
る。このためモーターの駆動時のノイズが同じ電圧供給
線を介して増幅回路の電源入力端子に印加される。その
結果出力にノイズがでるという問題があった。
(B) Conventional technology Conventionally, in the case of a tape recorder circuit, the actual value is 60-170.
As shown in Japanese Patent Publication No. 44, the drive motor of the tape recorder and the supply of operating voltage to the amplifier circuit are in parallel. Therefore, noise at the time of driving the motor is applied to the power input terminal of the amplifier circuit via the same voltage supply line. As a result, there is a problem that noise appears in the output.

(ハ)考案が解決しようとする問題点 本考案はモーターのノイズが増幅回路の電源入力端子
に混入しないようにするものである。
(C) Problems to be solved by the present invention The present invention is intended to prevent motor noise from being mixed into the power input terminal of the amplifier circuit.

(ニ)問題点を解決するための手段 本考案は、電圧源と、該電圧源を増幅回路の電源入力
端子に接続する電源スイッチと、該電源スイッチを通じ
て導通状態になるスイッチング回路と、該スイッチング
回路の導通にて前記電圧源よりフイルタ回路を通じて駆
動回路が形成されるモータとより成るテープレコーダー
回路を提供するものである。
(D) Means for Solving the Problems The present invention provides a voltage source, a power switch for connecting the voltage source to a power input terminal of an amplifier circuit, a switching circuit that becomes conductive through the power switch, and the switching circuit. An object of the present invention is to provide a tape recorder circuit including a motor in which a drive circuit is formed from a filter circuit by the voltage source when the circuit is conducted.

(ホ)作用 本考案のテープレコーダー回路によれば、スイッチの
投入で導通されるスイッチング回路によりモータは駆動
されるが、モーターノイズはフイルタ回路によって増幅
回路の電源入力端子に混入しない。
(E) Operation According to the tape recorder circuit of the present invention, the motor is driven by the switching circuit that is turned on when the switch is turned on, but the motor noise is not mixed into the power input terminal of the amplifier circuit by the filter circuit.

(ヘ)実施例 図面は本考案実施例のテープレコーダー回路の回路図
で、(1)は電圧源で、電源スイッチ(SW)を介して2
チヤンネル増幅回路(2)の電源入力端子に接続されて
いる。(3)はテープレコーダーの駆動モーター、
(4)は前記電源スイッチ(SW)の投入で導通するNPN
トランジスタ(5)及び該トランジスタ(5)の導通に
伴なって導通するPNPトランジスタ(6)より成るスイ
ッチング回路、(7)は抵抗(R3)とコンデンサ(C0
より成るフイルタ回路である。前記モータ(3)は電圧
源(1)よりフイルタ回路(7)を通じ前記トランジス
タ(6)の導通によってその駆動回路が形成されるもの
である。
(F) Embodiment The drawing is a circuit diagram of the tape recorder circuit of the embodiment of the present invention.
It is connected to the power input terminal of the channel amplifier (2). (3) is the drive motor of the tape recorder,
(4) is an NPN that becomes conductive when the power switch (SW) is turned on.
A switching circuit including a transistor (5) and a PNP transistor (6) that is turned on when the transistor (5) is turned on; (7) is a resistor (R 3 ) and a capacitor (C 0 )
A filter circuit comprising: The drive circuit of the motor (3) is formed by the conduction of the transistor (6) from the voltage source (1) through the filter circuit (7).

今、電源スイッチ(SW)を投入する前はPNPトランジ
スタ(6)は非導通でモーター(3)に電圧は印加され
ない。電源スイッチ(SW)を投入すると増幅回路(2)
の電源入力端子に動作電圧が印加される。また、電源ス
イッチ(SW)の投入でNPNトランジスタ(5)が導通す
るのでPNPトランジスタ(6)が導通し、モーター
(3)に動作電圧が供給される。そして、モーター
(3)からノイズが発生すると、PNPトランジスタ
(6)のコレクタ電位が瞬時に変化する。この変化分を
打ち消すようフイルタ回路(7)のコンデンサ(C0)が
充放電を瞬時において繰り返すので、電圧源(1)に直
接変動の影響は生じない。また、PNPトランジスタ
(6)は抵抗(R0)(R1)により自己バイアスがかかっ
ており、またNPNトランジスタ(5)の出力インピーダ
ンスは高いのでノイズが増幅回路(2)への電圧線路に
混入するのを確実に防止することができる。
Before turning on the power switch (SW), the PNP transistor (6) is non-conductive and no voltage is applied to the motor (3). When the power switch (SW) is turned on, the amplifier circuit (2)
Operating voltage is applied to the power input terminal of the power supply. Further, when the power switch (SW) is turned on, the NPN transistor (5) is turned on, so that the PNP transistor (6) is turned on and the operating voltage is supplied to the motor (3). When noise is generated from the motor (3), the collector potential of the PNP transistor (6) changes instantaneously. Since the capacitor (C 0 ) of the filter circuit (7) instantaneously repeats charging and discharging so as to cancel this variation, there is no direct fluctuation in the voltage source (1). The PNP transistor (6) is self-biased by the resistors (R 0 ) and (R 1 ), and the output impedance of the NPN transistor (5) is high, so noise is mixed in the voltage line to the amplifier circuit (2). Can be reliably prevented.

(ト)考案の効果 以上のように本考案によれば、電圧源とモーターとの
間にコンデンサを含むフイルタ回路と電源スイッチの投
入で動作電圧をモーターに供給しモーターノイズを前記
フイルタ回路により吸収するよう作用する半導体スイッ
チング回路を設けたので、モーターのノイズが増幅回路
へ混入するのを半導体スイッチング回路とフィルタ回路
により2重に防止することができる。
(G) Effect of the invention As described above, according to the invention, the filter circuit including a capacitor between the voltage source and the motor and the power switch are turned on to supply the operating voltage to the motor, and the motor noise is absorbed by the filter circuit. Since the semiconductor switching circuit is provided so as to operate, the noise of the motor can be prevented from being mixed into the amplifier circuit by the semiconductor switching circuit and the filter circuit.

【図面の簡単な説明】[Brief description of the drawings]

図は本考案実施例のテープレコーダー回路の回路図であ
る。 (1)……電圧源、(2)……増幅回路、(3)……モ
ーター、(4)……スイッチング回路、(7)……コン
デンサを含むフイルタ回路、(SW)……電源スイッチ。
The figure is a circuit diagram of the tape recorder circuit of the embodiment of the present invention. (1) ... voltage source, (2) ... amplifier circuit, (3) ... motor, (4) ... switching circuit, (7) ... filter circuit including capacitor, (SW) ... power switch.

Claims (1)

(57)【実用新案登録請求の範囲】(57) [Scope of request for utility model registration] 【請求項1】電圧源と、該電圧源を増幅回路の電源入力
端子に接続する電源スイッチと、該電源スイッチを通じ
て導通状態になる半導体スイッチング回路と、該半導体
スイッチング回路の導通にて前記電圧源よりフィルタ回
路を通じて駆動回路が形成されるモータとより成るテー
プレコーダー回路。
1. A voltage source, a power switch for connecting the voltage source to a power input terminal of an amplifier circuit, a semiconductor switching circuit that becomes conductive through the power switch, and the voltage source when the semiconductor switching circuit becomes conductive. A tape recorder circuit comprising a motor in which a drive circuit is formed through a filter circuit.
JP17372285U 1985-11-12 1985-11-12 Tape recorder circuit Expired - Lifetime JP2533630Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17372285U JP2533630Y2 (en) 1985-11-12 1985-11-12 Tape recorder circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17372285U JP2533630Y2 (en) 1985-11-12 1985-11-12 Tape recorder circuit

Publications (2)

Publication Number Publication Date
JPS6283207U JPS6283207U (en) 1987-05-27
JP2533630Y2 true JP2533630Y2 (en) 1997-04-23

Family

ID=31111449

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17372285U Expired - Lifetime JP2533630Y2 (en) 1985-11-12 1985-11-12 Tape recorder circuit

Country Status (1)

Country Link
JP (1) JP2533630Y2 (en)

Also Published As

Publication number Publication date
JPS6283207U (en) 1987-05-27

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