JPS5925614U

JPS5925614U - Tape recorder muting circuit

Info

Publication number: JPS5925614U
Application number: JP11800482U
Authority: JP
Inventors: 進山中; 黒柳　芳弘
Original assignee: 三洋電機株式会社
Priority date: 1982-08-02
Filing date: 1982-08-02
Publication date: 1984-02-17
Also published as: JPH021731Y2

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) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

図示した回路は本考案のミューティング回路の一実施例
である。主な図番の説明、１・・・磁気ヘッド、２・・・前置増
幅回路、４・・・主増幅回路、５・・・スピーカー、６
・・・ミューティング信号発生回路、７・・・ミューテ
ィング用トランジスター、８・・・スイッチ、９・・・
時定数回路、１３・・・スイッチングトランジスター、
１６・・・制御コンデンサー。The illustrated circuit is one embodiment of the muting circuit of the present invention. Explanation of main drawing numbers, 1...Magnetic head, 2...Preamplifier circuit, 4...Main amplifier circuit, 5...Speaker, 6
... Muting signal generation circuit, 7... Muting transistor, 8... Switch, 9...
Time constant circuit, 13... switching transistor,
16...Control capacitor.

Claims

[Scope of utility model registration request]

In a tape recorder configured such that power is supplied to an amplifier circuit through a switch that is closed by a playback operation, a time constant circuit that is connected in parallel to the switch and includes a capacitor, and a time constant circuit that is connected in parallel to the switch and includes a capacitor, and A switching transistor is biased into conduction by the charging current flowing through the capacitor when the switch is opened, and due to the conduction of the switching transistor, [
1. A muting circuit for a tape recorder, comprising a control capacitor which is photoelectrically activated, and wherein the muting means is maintained in an operating state for a predetermined period of time after a stop operation by the electric charge stored in the control capacitor.