PICTURE AMPLITUDE STABILIZING DEVICE

摘要

PURPOSE:To make a picture amplitude of a CRT display device stable by detecting the fluctuation of an input voltage of a picture amplitude stabilizing device and feeding it directly back to an error detection section of a power voltage stabilizing circuit for a horizontal output circuit. CONSTITUTION:A voltage fluctuation feedback resistor 12 of an input power voltage is provided between a power voltage input terminal of a picture amplitude stabilizing device and an error detection section of a power voltage stabilizing circuit. If an input voltage V1 of the picture amplitude stabilizing device is decreased due to any cause, the fluctuation of the input voltage V1 detected by the voltage fluctuation feedback resistor 12 is fed back to an error detection section of the stabilizing circuit. Thus, an error amplification transistor (TR) 7 is turned off and a control TR 6 is turned on. Then the output voltage is controlled to be an initial value and the amplitude of picture is stabilized.