| 摘要 |
PURPOSE:To adjust the horizontal amplitude while keeping a high voltage to a constant value by detecting a change in a high voltage attended with the adjustment of horizontal amplitude from a high voltage breeder dividing resistor and controlling a varactor circuit of a horizontal deflection circuit by the detected output. CONSTITUTION:In decreasing an inductance of a horizontal amplitude adjusting coil 9 so as to increase the horizontal amplitude, the high voltage is increased and a detected voltage at a point (a) is also increased. Since a prescribed bias is applied to an operational amplifier 18 by a +E2 power supply, when the detected potential of the point (a) is increased, a difference between a non- inverting input terminal and an inverting input terminal is amplified in the way of non-inversion by the ratio of resistors 20, 21 and applied to a transistor (TR) 14. Thus, the resonance capacitance by resonance capacitors 4, 13 is increased so as to decrease a high voltage generated in the secondary winding of a flyback transformer 5. Thus, the fluctuation in high voltage is suppressed and the horizontal amplitude is adjusted. |
