SPOT KILLER CIRCUIT

PROBLEM TO BE SOLVED: To make a spot killer operation stable by using a leading of a nega tive voltage so as to forcibly bring a G2 voltage to zero volt when power is turned off. SOLUTION: A negative power supply E1 is generated at application of power and a capacitor C1 is charged through a chargin...

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Bibliographic Details
Main Authors NAGABAYASHI TAMOTSU, SHIMIZU MASAJI
Format Patent
LanguageEnglish
Published 02.02.2000
Edition7
Subjects
ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
CRYPTOGRAPHY
DISPLAY
EDUCATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
SEALS
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Summary:PROBLEM TO BE SOLVED: To make a spot killer operation stable by using a leading of a nega tive voltage so as to forcibly bring a G2 voltage to zero volt when power is turned off. SOLUTION: A negative power supply E1 is generated at application of power and a capacitor C1 is charged through a charging diode D1. A base voltage of a spot killer output transistor(TR) Q1 reaches 0 V and the TR Q1 is in a cut-off state. When power is turned off, the negative power supply E1 rises and a base current is supplied to the base of the spot killer output TR Q1 through the capacitor C1 by charges stored in the capacitor C1, the spot killer output TR Q1 becomes conductive and a G2 voltage is discharged to ground through a current limit resistor R1. The capacitor C1 is required to have a capacity of storing charges by which a base current of the spot killer output TR Q1 is continuously supplied till the discharge of the G2 voltage is finished.
Bibliography:Application Number: JP19980202924