JPS5869320U - recording bias circuit - Google Patents
recording bias circuitInfo
- Publication number
- JPS5869320U JPS5869320U JP16446281U JP16446281U JPS5869320U JP S5869320 U JPS5869320 U JP S5869320U JP 16446281 U JP16446281 U JP 16446281U JP 16446281 U JP16446281 U JP 16446281U JP S5869320 U JPS5869320 U JP S5869320U
- Authority
- JP
- Japan
- Prior art keywords
- current
- recording
- bias circuit
- bias
- oscillation
- 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
- Control Of Electrical Variables (AREA)
- Amplifiers (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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来の録音バイアス回路の回路図、第２図〜第
４図は本考案の一実施例を説明するためのものであって
、第２図は録音バイアス回路の回路図、第３図は発振ト
ランジスタのエミッタＮ、流の波形図、第４図は電圧検
出用抵抗Ｒ２の一端における電圧の波形図である。
なお図面に用いられている符号において、３・・・・・
・録再用磁気ヘッド、４・・・・・・ＬＣ発振回路、８
・・・・・・負帰還回路、Ｑｌ・・・・・・発振トラン
ジスタ、Ｑ２・・・・・・制御トランジスタ、Ｒ２・・
・・・・電圧検出用抵抗である。Figure 1 is a circuit diagram of a conventional recording bias circuit, Figures 2 to 4 are for explaining an embodiment of the present invention, Figure 2 is a circuit diagram of a recording bias circuit, and Figure 3 is a circuit diagram of a recording bias circuit. The figure is a waveform diagram of the current at the emitter N of the oscillation transistor, and FIG. 4 is a waveform diagram of the voltage at one end of the voltage detection resistor R2. In addition, in the symbols used in the drawings, 3...
・Magnetic head for recording/reproduction, 4...LC oscillation circuit, 8
... Negative feedback circuit, Ql ... Oscillation transistor, Q2 ... Control transistor, R2 ...
...Resistance for voltage detection.
Claims (1)
回路からの交流バイアス電流とを重畳して成る録音電流
をヘッドに供給するようにした録音バイアス回路におい
て、前記交流バイアス電流に比例する電圧を出力する検
出電圧出力手段と、前記発振回路の発振トランジスタに
直列接続された制御トランジスタとをそれぞれ具備する
負帰還回路を設け、前記制御トランジスタの制御端子に
所定の電源電圧を供給すると同時に、前記検出電圧出力
手段からの出力電圧を前記電源電圧に重畳して前記発振
トランジスタの制御端子に供給するように構成し、これ
によって前記バイアス電流を定電流化するようにしたこ
と□を特徴とする録音バイアス回路。In a recording bias circuit configured to supply a recording current to a head by superimposing a signal current corresponding to an audio signal to be recorded and an AC bias current from an oscillation circuit, a voltage proportional to the AC bias current is output. and a control transistor connected in series to the oscillation transistor of the oscillation circuit. A recording bias circuit characterized in that the output voltage from the output means is configured to be superimposed on the power supply voltage and supplied to the control terminal of the oscillation transistor, thereby making the bias current a constant current. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16446281U JPS5869320U (en) | 1981-11-04 | 1981-11-04 | recording bias circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16446281U JPS5869320U (en) | 1981-11-04 | 1981-11-04 | recording bias circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5869320U true JPS5869320U (en) | 1983-05-11 |
Family
ID=29956706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16446281U Pending JPS5869320U (en) | 1981-11-04 | 1981-11-04 | recording bias circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5869320U (en) |
-
1981
- 1981-11-04 JP JP16446281U patent/JPS5869320U/en active Pending
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