JPS6313425U

JPS6313425U -

Info

Publication number: JPS6313425U
Application number: JP8388886U
Authority: JP
Priority date: 1986-06-02
Filing date: 1986-06-02
Publication date: 1988-01-28

Description

[Brief explanation of the drawing]

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、１…磁気ヘツド、２…前置増
幅回路、４…主増幅回路、６…第１スイツチ、７
…第２スイツチ、８…プランジヤー、９…駆動ト
ランジスター、１１…選曲用増幅回路、１３…整
流回路、１６…時定数回路、１７…無信号部検出
用トランジスター。 The illustrated circuit is one embodiment of the music selection circuit of the present invention. Explanation of main drawing numbers, 1... Magnetic head, 2... Preamplifier circuit, 4... Main amplifier circuit, 6... First switch, 7
...Second switch, 8...Plunger, 9...Drive transistor, 11...Amplification circuit for music selection, 13...Rectifier circuit, 16 ...Time constant circuit, 17...Transistor for detecting no-signal portion.

Claims

[Scope of utility model registration request]

In a tape recorder having a song selection function that detects a no-signal part 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 plunger which puts the tape recorder into a song selection operation state by holding a fast-forward or rewind operation member in an operating position when in a suction state, and switches the tape recorder into a playback state by returning to a non-suction state; A first switch that is closed at a certain time, a second switch that is closed when a fast forward or rewind operation is performed, and a biased conductive state when the first switch and the second switch are both in the closed state. a drive transistor that causes the plunger to perform a suction operation when the plunger is turned on, and a transistor for detecting a non-signal portion that is in a conductive state when there is a signal reproduced from the magnetic tape during a music selection operation, and that is inverted to a non-conductive state when the signal disappears for a predetermined period of time. , a capacitor connected between the base of the drive transistor and the collector of the no-signal portion detection transistor, and when the no-signal portion detection transistor is inverted to a non-conducting state, the capacitor is connected to the base of the drive transistor. A music selection circuit for a tape recorder, characterized in that a reverse bias voltage is applied to the base of the drive transistor, and the plunger is returned to a non-suction state by reversing the drive transistor to a non-conducting state.