JPH0344913U

JPH0344913U -

Info

Publication number: JPH0344913U
Application number: JP10404789U
Authority: JP
Priority date: 1989-09-05
Filing date: 1989-09-05
Publication date: 1991-04-25

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す回路図、第２
図はその動作説明用波形図、第３図は従来の音声
ミユート回路を示す回路図、第４図はその動作説
明用波形図である。１……電源、２……電源スイツチ、３……回路
電源ライン、４，５……第１、第２のトランジス
タ、６……音声信号ライン、７，８……第１、第
２のコンデンサ、９……ダイオード。 Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure is a waveform diagram for explaining its operation, FIG. 3 is a circuit diagram showing a conventional audio mute circuit, and FIG. 4 is a waveform diagram for explaining its operation. 1...Power source, 2...Power switch, 3...Circuit power line, 4, 5...First and second transistors, 6...Audio signal line, 7, 8...First and second capacitors , 9...diode.

Claims

[Scope of utility model registration request]

A circuit power supply line is connected to a power supply via a power switch, a first capacitor for reducing power supply impedance is connected to the circuit power supply line, a first transistor operates when the power switch is turned off, and a first transistor operates when the power switch is turned off. In an audio mute circuit having a second transistor that grounds an audio signal line by discharging from the capacitor through the first transistor, a second capacitor is provided that is connected in parallel with the first capacitor via a diode. An audio mute circuit characterized in that the operating time of the second transistor is lengthened.