JPS60127506A - Bias oscillating circuit of magnetic sound recorder - Google Patents
Bias oscillating circuit of magnetic sound recorderInfo
- Publication number
- JPS60127506A JPS60127506A JP23668683A JP23668683A JPS60127506A JP S60127506 A JPS60127506 A JP S60127506A JP 23668683 A JP23668683 A JP 23668683A JP 23668683 A JP23668683 A JP 23668683A JP S60127506 A JPS60127506 A JP S60127506A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- transistor
- oscillation
- bias
- zener diode
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/027—Analogue recording
- G11B5/03—Biasing
Landscapes
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は磁気録音機のバイアス発振回路の出力の時間的
なドリフトｉ少なくし、安定した発振出力を得ることが
できるバイアス発振回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a bias oscillation circuit for a magnetic recorder that can reduce the temporal drift i of the output of the bias oscillation circuit and obtain a stable oscillation output.
従来例の構成とその問題点
従来のバイアス発振回路の出力はトランジスタやへノド
の自己発熱などにより第２図内のＢのような出力となる
。つまり録音スイッチが入った瞬間に定常値の約９０パ
ーセントの値が出力され、それから徐々に上昇し、かな
りの時間がかかって定常値となっていた。Structure of the Conventional Example and Its Problems The output of the conventional bias oscillation circuit is as shown in B in FIG. 2 due to self-heating of the transistor and the henode. In other words, the moment the recording switch was turned on, a value of approximately 90% of the steady value was output, and then it gradually increased and took a considerable amount of time to reach the steady value.
しかしながら、スイッチが入った直後と時間が経過して
からでは録音バイアスが変化している為録音再生周波数
特性が若干変化し、バイアス値の調整をするのにかなり
時間が経ってからでないと調整できないという欠点を有
していた。However, since the recording bias changes between immediately after the switch is turned on and after some time has passed, the recording and playback frequency characteristics change slightly, and the bias value cannot be adjusted until a considerable amount of time has passed. It had the following drawback.
発明の目的
本発明は上記問題点を解決し、開眼な構成で出力のドリ
フトを少なくする磁気録音機のバイアス−発振回路を提
供することを目的とする。OBJECTS OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a bias-oscillation circuit for a magnetic recorder that has a simple structure and reduces output drift.
発明の構成
本発明は、発振トランジスタのベースバイアスを決めて
いる対アース間のブリーダ抵抗、又はツェナーダイオー
ドを、録音スイッチをオン状態とした後一定時間切り離
すトランジスタ回路を備え、発振トランジスタのベース
バイアスを定常時より高くし一定時間後足常のベースバ
イアスレベルとした構成となっており、これにより録音
スイッチをオン状態とした時発振出力を太きくし、一定
時間抜定常の発振出力とすることができる。Structure of the Invention The present invention includes a transistor circuit that disconnects a bleeder resistor or a Zener diode between the ground and the ground that determines the base bias of the oscillation transistor for a certain period of time after turning on the recording switch. The base bias level is set to be higher than the steady state for a certain period of time, and this makes the oscillation output thicker when the recording switch is turned on, making it possible to make the oscillation output steady for a certain period of time. .
実施例の説明
第１図は本発明の一実施例の磁気録音機のバイアス発振
回路図である。第１図において、１〜３はコンデンサ、
４は抵抗、５は発振コイル、６は抵抗、７はコンデンサ
、８は発振トランジスタ、９は抵抗、１０．１１はコン
デンサ、１２は半固定抵抗器、１３は抵抗、１４はツェ
ナーダイオード、１５はトランジスタ、１６はコンデン
サ、１７は抵抗、Ｓｌは録音スイッチである。DESCRIPTION OF EMBODIMENTS FIG. 1 is a bias oscillation circuit diagram of a magnetic recorder according to an embodiment of the present invention. In Fig. 1, 1 to 3 are capacitors,
4 is a resistor, 5 is an oscillation coil, 6 is a resistor, 7 is a capacitor, 8 is an oscillation transistor, 9 is a resistor, 10.11 is a capacitor, 12 is a semi-fixed resistor, 13 is a resistor, 14 is a Zener diode, 15 is a A transistor, 16 a capacitor, 17 a resistor, and Sl a recording switch.
以上の構成により、まず録音スイッチＳ１をオン状態に
すると抵抗器１７全通してコンデンサ１６が光電される
。コンデンサ１６の充電電圧がツェナーダイオード１４
のツェナー電圧とトランジスタ１６のベース・エミッタ
間電圧の和の値になるまでトランジスタ１５はカットオ
フ状態であシ発振トランジスタ８のベース電圧はその間
だけ高い電圧がかかり発振出力は大きくなる。トランジ
スタ１５がオンすれば発振トランジスタ８のベース電圧
はツェナーダイオード１４でクランプされた値となり定
常値となる。第２図内のＡはその動作の発振出力を示し
たものである。With the above configuration, when the recording switch S1 is first turned on, the capacitor 16 is photoelectronized through the entire resistor 17. The charging voltage of the capacitor 16 is the Zener diode 14
The transistor 15 remains in a cut-off state until it reaches the sum of the Zener voltage of 1 and the base-emitter voltage of the transistor 16, and a high voltage is applied to the base voltage of the oscillation transistor 8 during that time, increasing the oscillation output. When the transistor 15 is turned on, the base voltage of the oscillation transistor 8 becomes a value clamped by the Zener diode 14 and becomes a steady value. A in FIG. 2 shows the oscillation output of that operation.
尚、ツェナーダイオード１４はブリーダ抵抗等の抵抗器
であっても動作は同じようになる。Note that even if the Zener diode 14 is a resistor such as a bleeder resistor, the operation will be the same.
発明の効果
以上のように、本発明は一度発振出力を大きくしておい
てから定常値に戻しているので時間的ドリフトは小さく
なり、簡単な構成で安定性の高いバイアス発振回路にす
ることができ、実用価値大なるものである。Effects of the Invention As described above, in the present invention, the oscillation output is increased once and then returned to a steady value, so the temporal drift is reduced, and a highly stable bias oscillation circuit can be created with a simple configuration. It is possible and has great practical value.
第１図は本発明の一実施例の磁気録音機のバイアス発振
回路図、第２図は同発振出力図である。
８・・・・・・発振トランジスタ、１４・・・・・・ツ
ェナーダイオード、１５・・・・・・トランジスタ、１
６・・・・・コンデンサ、１７・・・・・・抵抗、Ｓｌ
・・・・・・録音スイッチ。FIG. 1 is a bias oscillation circuit diagram of a magnetic recorder according to an embodiment of the present invention, and FIG. 2 is an oscillation output diagram of the same. 8...Oscillation transistor, 14...Zener diode, 15...Transistor, 1
6... Capacitor, 17... Resistor, Sl
...Recording switch.
Claims (1)
ス間のプリーダ抵抗あるいはツェナーダイオードを、録
音スイソチヲ卓を半オン状態とした後一定時間切り離す
トランジスタ回路を備え、発振トランジスタのベースバ
イアスを定常時より高くシ一定時間抜定常のベースバイ
アスレベルとする磁気録音機のバイアス発振回路。Equipped with a transistor circuit that disconnects the leader resistor or Zener diode between the ground and ground, which determines the base bias of the oscillation transistor, for a certain period of time after the recording switch is in a half-on state, keeping the base bias of the oscillation transistor higher than in normal conditions. A bias oscillation circuit for a magnetic recorder that has a steady base bias level without time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23668683A JPS60127506A (en) | 1983-12-15 | 1983-12-15 | Bias oscillating circuit of magnetic sound recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23668683A JPS60127506A (en) | 1983-12-15 | 1983-12-15 | Bias oscillating circuit of magnetic sound recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60127506A true JPS60127506A (en) | 1985-07-08 |
| JPH0513322B2 JPH0513322B2 (en) | 1993-02-22 |
Family
ID=17004268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23668683A Granted JPS60127506A (en) | 1983-12-15 | 1983-12-15 | Bias oscillating circuit of magnetic sound recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60127506A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5548727A (en) * | 1978-10-02 | 1980-04-08 | Hitachi Ltd | Asembling device of liquid crystal displaying cell |
-
1983
- 1983-12-15 JP JP23668683A patent/JPS60127506A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5548727A (en) * | 1978-10-02 | 1980-04-08 | Hitachi Ltd | Asembling device of liquid crystal displaying cell |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0513322B2 (en) | 1993-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS60127506A (en) | Bias oscillating circuit of magnetic sound recorder | |
| JPS5933857B2 (en) | Cairo | |
| JPH0115217Y2 (en) | ||
| JPS5838692Y2 (en) | Shyan Regyure Tatsuki O-Day Out Cairo | |
| JP2829773B2 (en) | Comparator circuit | |
| JPH024500Y2 (en) | ||
| JPS5928495Y2 (en) | tape recorder | |
| JPS5871214U (en) | Muting signal generation circuit | |
| JPS596005Y2 (en) | Muting when power is on/off | |
| JPH0442844B2 (en) | ||
| JPS58166136U (en) | automatic frequency control circuit | |
| JPS58173916U (en) | oscillation circuit | |
| JPH0487412A (en) | Ripple filter circuit | |
| JPS606342U (en) | AFC circuit | |
| JPS5873653U (en) | High cut circuit in AM receiver | |
| JPS6013307A (en) | Sound recording bias circuit | |
| JPS60163503U (en) | tape recorder | |
| JPS59147230U (en) | reset circuit | |
| JPS6081920A (en) | Monostable multivibrator | |
| JPS6267705A (en) | Tape recorder with built-in microphone | |
| JPS5981114U (en) | Power amplifier bias control device | |
| JPS5690495A (en) | Integrated circuit amplifier used in combination with holding capacitor | |
| JPH0744392B2 (en) | Low frequency amplifier circuit | |
| JPS59101008A (en) | Sound recording amplifier circuit of tape recorder | |
| JPS5834464U (en) | High voltage stop circuit detection circuit |