JPS60103923U

JPS60103923U - Muting circuit

Info

Publication number: JPS60103923U
Application number: JP19669283U
Authority: JP
Inventors: 黒田　洋
Original assignee: 三洋電機株式会社
Priority date: 1983-12-20
Filing date: 1983-12-20
Publication date: 1985-07-16

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 drawings]

図面はこの考案のミューティング回路の１実施例を示し
、第１図はブロック図、第２図は第１図の詳細な結線図
、第３図ａ、　ｂは時間と電源電流、電源電圧との関係
説明図である。１・・・テープレコーダ、２・・・パワーアンプ内蔵型
スピーカ装置、３・・・電源プラグ、４・・・電源トラ
ンス、５・・・整流器、６・・・安定化回路、７・・・
安定化基準電源、８・・・インピーダンス素子、９・・
・比較回路、１０・・・検出部、１１・・・出力ミュー
ト部、１２１．１２ｒ・・・パワーアンプ、１３１，１
３ｒ・・・スピーカ、ｌｃｌ・・・反転増幅器、ＩＣ２
・・・非反転増幅器、Ｑｌ、　Ｑ２・・・ミューティン
グ用第１、第２トランジスタ、π・・・ツェナダイオー
ド、Ｒ１・・・第１抵抗。The drawings show one embodiment of the muting circuit of this invention. Fig. 1 is a block diagram, Fig. 2 is a detailed wiring diagram of Fig. 1, and Fig. 3 a and b are diagrams showing time, power supply current, power supply voltage, and FIG. DESCRIPTION OF SYMBOLS 1... Tape recorder, 2... Power amplifier built-in speaker device, 3... Power plug, 4... Power transformer, 5... Rectifier, 6... Stabilization circuit, 7...
Stabilized reference power supply, 8... Impedance element, 9...
-Comparison circuit, 10...detection section, 11...output mute section, 121.12r...power amplifier, 131,1
3r...Speaker, lcl...Inverting amplifier, IC2
... Non-inverting amplifier, Ql, Q2... First and second transistors for muting, π... Zener diode, R1... First resistor.

Claims

[Claims for Utility Model Registration] ■ An impedance element provided in the power supply line to the audio equipment, a detection unit that detects a change in the value of the current flowing through the impedance element, and a detection signal from the detection unit that detects the current A muting circuit comprising: an output muting section that mutes an output signal of the audio device when a value changes. ■ The detection section is formed by an inverting amplifier and a non-inverting amplifier, and the output muting section is formed by a muting transistor, and a stabilizing voltage is applied to the non-inverting input terminal of the inverting amplifier and the inverting input terminal of the non-inverting amplifier. At the same time, the inverting input terminal of the inverting amplifier and the non-inverting input terminal of the non-inverting amplifier are connected to one end of the resistance element forming the impedance element on the audio equipment side, and the muting is performed by the output signals of both the amplifiers. 2. A muting circuit according to claim 1, which mutes an output signal of an audio device by turning on and off a transistor.