| 摘要 |
PURPOSE:To prevent the expansion of vertical amplitude at the time of descent of AC source voltage by making semi-stabilized DC source voltage by a transistor using semi-stabilized voltage used for a horizontal oscillation circuit, and by using the DC voltage for a vertical oscillation circuit. CONSTITUTION:A source voltage 12 for a vertical oscillation circuit 13 provided at an inside of a television deflection signal processing IC is made from +B2 power source (116V) line 1 through resistors 10, 18. The voltage 12 is about 9.3V and stabilized by Zener diode inside the IC6, but since the value of resistor 10 is set high, the current is hardly conducted thereto, and it is semi-stabilized power source which gradually descends at the time when AC voltage descends. Therefore, it is possible to make AC power source of 12V to be used for vertical oscillation circuit by selecting the value of the resistor 18. By supplying semi- stabilized 12V to the vertical oscillation circuit 9 from emitter by semi- stabilizing the base voltage of transistor 22, it is possible to prevent the expansion of vertical amplitude when AC source voltage has become lowered and to maintain the picture natural. |
