JPS6324710U - - Google Patents
Info
- Publication number
- JPS6324710U JPS6324710U JP11604986U JP11604986U JPS6324710U JP S6324710 U JPS6324710 U JP S6324710U JP 11604986 U JP11604986 U JP 11604986U JP 11604986 U JP11604986 U JP 11604986U JP S6324710 U JPS6324710 U JP S6324710U
- Authority
- JP
- Japan
- Prior art keywords
- oscillation
- bias
- transistor
- varying
- head
- 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
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
第１図は本考案の構成を示す一実施例の回路図
。第２図は本考案の一実施例の作用の説明に供す
る線図。第３図は従来例の構成を示す回路図。
１１……録音磁気ヘツド、１２……録音増幅器
、１３……バイアストラツプ回路、１５……消去
磁気ヘツド、１６……発振トランス、１８……バ
イアス発振回路、２０……メタル磁気テープ検出
スイツチ、２１……ノーマル磁気テープ検出スイ
ツチ、Ｑ３９〜Ｑ４１およびＱ４７〜Ｑ５１……
トランジスタ。
FIG. 1 is a circuit diagram of an embodiment showing the configuration of the present invention. FIG. 2 is a diagram for explaining the operation of an embodiment of the present invention. FIG. 3 is a circuit diagram showing the configuration of a conventional example. 11... Recording magnetic head, 12... Recording amplifier, 13... Bias trap circuit, 15... Erase magnetic head, 16... Oscillation transformer, 18... Bias oscillation circuit, 20... Metal magnetic tape detection switch, 21 ...Normal magnetic tape detection switch, Q39 to Q41 and Q47 to Q51 ...
transistor.
Claims (1)
振回路からなり、かつ前記トランジスタのエミツ
タ電流を可変することによつて発振出力の調整可
能なバイアス発振回路と、同一種類の磁気テープ
に対して前記発振トランスの１次側電圧を記録磁
気ヘツドおよび消去磁気ヘツドの適正バイアス電
流を流すに要する電圧以上の値に前記エミツタ電
流を可変する可変手段と、前記同一種類の磁気テ
ープが装填されているとき前記記録磁気ヘツドへ
の供給出力を前記発振トランスの２次側で減衰さ
せる減衰手段とを備えたことを特徴とするバイア
ス発振装置。 A bias oscillation circuit consisting of an LC oscillation circuit including a transistor and an oscillation transformer, and whose oscillation output can be adjusted by varying the emitter current of the transistor; a variable means for varying the emitter current to a value higher than the voltage required to flow an appropriate bias current of the recording magnetic head and the erasing magnetic head; and when the same type of magnetic tape is loaded, the recording magnetic A bias oscillation device comprising attenuation means for attenuating the output supplied to the head on the secondary side of the oscillation transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11604986U JPS6324710U (en) | 1986-07-30 | 1986-07-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11604986U JPS6324710U (en) | 1986-07-30 | 1986-07-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6324710U true JPS6324710U (en) | 1988-02-18 |
Family
ID=31000280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11604986U Pending JPS6324710U (en) | 1986-07-30 | 1986-07-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6324710U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5637807A (en) * | 1979-08-31 | 1981-04-11 | Teac Co | Magnetic recording circuit device |
| JPS6148411B2 (en) * | 1980-08-21 | 1986-10-24 | Teijin Ltd |
-
1986
- 1986-07-30 JP JP11604986U patent/JPS6324710U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5637807A (en) * | 1979-08-31 | 1981-04-11 | Teac Co | Magnetic recording circuit device |
| JPS6148411B2 (en) * | 1980-08-21 | 1986-10-24 | Teijin Ltd |
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