JPS6257937U - - Google Patents
Info
- Publication number
- JPS6257937U JPS6257937U JP14925885U JP14925885U JPS6257937U JP S6257937 U JPS6257937 U JP S6257937U JP 14925885 U JP14925885 U JP 14925885U JP 14925885 U JP14925885 U JP 14925885U JP S6257937 U JPS6257937 U JP S6257937U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- signal portion
- state
- signal
- 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
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Description
図示した回路は、本考案の選曲回路の一実施例
である。
主な図番の説明、２……前置増幅回路、４……
主増幅回路、６……電池、７……定電圧回路、８
……無信号部検出回路、１０……選曲スイツチ、
１１……プランジヤー、１２……駆動トランジス
ター、１４……コンデンサー、１５……第１抵抗
、１６……第１スイツチングトランジスター、１
７……第２抵抗、１９……第１ツエナーダイオー
ド、２１……第２スイツチングトランジスター、
２２……第３抵抗、２４……第２ツエナーダイオ
ード。
The illustrated circuit is one embodiment of the music selection circuit of the present invention. Explanation of main drawing numbers, 2... Preamplifier circuit, 4...
Main amplifier circuit, 6... Battery, 7... Constant voltage circuit, 8
...No-signal portion detection circuit, 10...Music selection switch,
11...Plunger, 12...Drive transistor, 14...Capacitor, 15...First resistor, 16...First switching transistor, 1
7... Second resistor, 19... First Zener diode, 21... Second switching transistor,
22...Third resistor, 24...Second Zener diode.
Claims (1)
ある無信号部を早送り又は巻戻し状態にて検出す
ることにより早送り又は巻戻し状態を解除して再
生状態に切換える選曲機能を有するテープレコー
ダーにおいて、電池より得られる電源を所定の電
圧値にすることにより増幅回路に供給する定電圧
回路と、リール軸の駆動動作を行なうと共に電池
の電圧値に対応して回転数が変化するリール軸駆
動用電動機と、選曲動作時前記定電圧回路からの
電源が供給されて動作状態になると共に再生信号
の有・無により充電電圧が変化するコンデンサー
の充電電圧の低下を検出することによつて無信号
部を検出する無信号部検出回路とより成り、電源
電圧の低下に対応して前記コンデンサーの放電時
定数を大きくするようにしたことを特徴とするテ
ープレコーダーの選曲回路。 A tape recorder having a song selection function that detects a no-signal portion between signals of music or the like recorded on a magnetic tape in a fast-forward or rewind state, releases the fast-forward or rewind state, and switches to a playback state, A constant voltage circuit supplies the power obtained from the battery to a predetermined voltage value to the amplifier circuit, and a reel shaft drive electric motor that drives the reel shaft and whose rotational speed changes in accordance with the voltage value of the battery. During the song selection operation, power is supplied from the constant voltage circuit to enter the operating state, and the no-signal portion is detected by detecting a drop in the charging voltage of the capacitor, whose charging voltage changes depending on the presence or absence of a playback signal. 1. A music selection circuit for a tape recorder, comprising a no-signal detection circuit for detecting a non-signal portion, and increasing a discharge time constant of the capacitor in response to a drop in power supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14925885U JPS6257937U (en) | 1985-09-30 | 1985-09-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14925885U JPS6257937U (en) | 1985-09-30 | 1985-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6257937U true JPS6257937U (en) | 1987-04-10 |
Family
ID=31064296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14925885U Pending JPS6257937U (en) | 1985-09-30 | 1985-09-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6257937U (en) |
-
1985
- 1985-09-30 JP JP14925885U patent/JPS6257937U/ja active Pending
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