Method and circuit for spot-killer control in cathode-ray tube

摘要: Disclosed are a method and an apparatus for preventing appearance of zigzag flush light in cathode-ray tube at the time turning it off. A train power-off control pulses are produced in synchronization with vertical sweeping signal; spot-killer signal starts selected pulse to make whole screen the cathode-ray bright; power supply turns off another selected pulse, so that is caused termination the vertical sweeping. Thus, remaining static electricity discharged lowermost of the tube. To assure residual discharged completely, length "t1"(continuing integer as long the pulse-to-pulse duration) determined meet size