JPH02132360U - - Google Patents
Info
- Publication number
- JPH02132360U JPH02132360U JP3951189U JP3951189U JPH02132360U JP H02132360 U JPH02132360 U JP H02132360U JP 3951189 U JP3951189 U JP 3951189U JP 3951189 U JP3951189 U JP 3951189U JP H02132360 U JPH02132360 U JP H02132360U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- level
- microphone
- main amplifier
- amplifier 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 3
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Description
図示した回路は、本考案の音量制御回路の一実
施例である。
主な図番の説明、６……録音再生兼用磁気ヘツ
ド、７……マイクロフオン、８……マイクロフオ
ン用増幅回路、９……前置増幅回路、１１……主
増幅回路、１２……ヘツドフオンジヤツク、１５
……録音用増幅回路、１６……電動機、１７……
電動機駆動回路、１９……第１スイツチ、２０…
…信号検出回路、２５……信号レベル低下用トラ
ンジスター、２８……第２スイツチ、２９……制
御トランジスター。
The illustrated circuit is one embodiment of the volume control circuit of the present invention. Explanation of main drawing numbers, 6...Magnetic head for both recording and playback, 7...Microphone, 8...Microphone amplifier circuit, 9...Preamplifier circuit, 11...Main amplifier circuit, 12 ...Head Huonjac, 15
...Recording amplifier circuit, 16...Electric motor, 17...
Motor drive circuit, 19... first switch, 20...
... Signal detection circuit, 25 ... Signal level lowering transistor, 28 ... Second switch, 29 ... Control transistor.
Claims (1)
ンによつて聴取するように構成されたテープレコ
ーダーにおいて、磁気ヘツドにより再生された信
号が入力されるとともに該信号を増幅する主増幅
回路と、該主増幅回路によつて増幅された信号が
印加されるとともにヘツドフオンプラグが挿入さ
れるヘツドフオンジヤツクと、音響信号を電気信
号に変換するマイクロフオンと、該マイクロフオ
ンより得られる信号のレベルを検出するとともに
その信号のレベルが所定のレベルを越えた状態に
あるとき駆動信号を出力する信号検出回路と、該
信号検出回路より出力される駆動信号が印加され
ると動作状態になるとともに前記主増幅回路に入
力される信号のレベルを低下せしめる信号レベル
低下用手段とより成るテープレコーダーの音量制
御回路。 A tape recorder configured to listen to a signal reproduced by a magnetic head using a headphone includes a main amplifier circuit to which the signal reproduced by the magnetic head is input and amplifies the signal, and a main amplifier circuit that amplifies the signal. A headphone jack to which the amplified signal is applied and a headphone plug inserted; a microphone that converts the acoustic signal into an electrical signal; and a microphone that detects the level of the signal obtained from the microphone and detects its level. a signal detection circuit that outputs a drive signal when the signal level exceeds a predetermined level; and when the drive signal output from the signal detection circuit is applied, it becomes operational and is input to the main amplifier circuit. A volume control circuit for a tape recorder, comprising signal level reducing means for reducing the level of the signal being played.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3951189U JPH02132360U (en) | 1989-04-03 | 1989-04-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3951189U JPH02132360U (en) | 1989-04-03 | 1989-04-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02132360U true JPH02132360U (en) | 1990-11-02 |
Family
ID=31548483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3951189U Pending JPH02132360U (en) | 1989-04-03 | 1989-04-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02132360U (en) |
-
1989
- 1989-04-03 JP JP3951189U patent/JPH02132360U/ja active Pending
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