JPS6381513U

JPS6381513U -

Info

Publication number: JPS6381513U
Application number: JP17539186U
Authority: JP
Priority date: 1986-11-17
Filing date: 1986-11-17
Publication date: 1988-05-28

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の構成を示す回路図
、第２図は第１図の動作説明用のタイミングチヤ
ート図、第３図は電源オフ後、再びオンした場合
における第１図の動作説明用のタイミングチヤー
ト図、第４図は本考案の他の一実施例を示す回路
図、第５図は本考案のさらに他の一実施例を示す
回路図、第６図は従来のミユート回路を示す回路
図、第７図は第６図の動作説明用のタイミングチ
ヤート図である。１１……ミユート回路、１２，１３……抵抗、
１６……差動アンプ、１７……コンデンサ、１８
……トランジスタ、１９……アナログスイツチ、
２１，２２……抵抗、２３……コンデンサ、２４
……トランジスタ、２６……リレー。 Fig. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, Fig. 2 is a timing chart for explaining the operation of Fig. 1, and Fig. 3 is a diagram showing the configuration of Fig. 1 when the power is turned on again after being turned off. 4 is a circuit diagram showing another embodiment of the present invention, FIG. 5 is a circuit diagram showing still another embodiment of the present invention, and FIG. 6 is a conventional MIUTO diagram. A circuit diagram showing the circuit, and FIG. 7 is a timing chart for explaining the operation of FIG. 6. 11... Mute circuit, 12, 13... Resistor,
16...Differential amplifier, 17...Capacitor, 18
...transistor, 19...analog switch,
21, 22...Resistor, 23...Capacitor, 24
...transistor, 26...relay.

Claims

[Claims for Utility Model Registration] A device that stops video output or audio output through on/off control of a switch in response to unstable operation of a circuit during transient changes in power supply voltage when the power is turned on or off. bias applying means that applies a bias voltage that increases with a time constant slower than the increase in power supply voltage due to power-on to a control terminal that turns on and off the switch depending on whether or not the voltage is equal to or higher than a threshold level; A differential amplifying means has a constant bias voltage applied to the differential input terminal, and the differential amplifying means amplifies a minute potential difference that occurs between the differential input terminals when the power is turned off, thereby increasing the potential of the control terminal. A miute circuit characterized in that it is provided with a transition means for transitioning so as to cross a threshold value.