| 摘要 |
PURPOSE:To apply a power supply voltage to a horizontal deflection circuit to correct a horizontal trapezoidal distortion on a screen. CONSTITUTION:A monostable multivibrator A10 outputs a pulse having a duty cycle proportional to a vertical vertical deflection frequency and the pulse is converted into a DC voltage at a 1st smoothing circuit (R10, C10). The DC voltage is applied to a collector of a transistor(TR) Q10 via a buffer amplifier 12. A pulse whose duty is inversely proportional to a horizontal deflection frequency is fed to a base of the TRQ10 from a monostable multivibrator B14. A collector output of the TRQ10 is converted into a DC voltage by a 2nd smoothing circuit (R12, C12) and the DC voltage is fed to an integration circuit (R18, C14, 20) via a buffer amplifier 16 and an inverse amplifier circuit (R14, R16, R18). A TRQ12 is turned on by a vertical synchronizing signal to discharge the charge in the capacitor C14. Thus, a sawtooth voltage having a vertical synchronizing signal period is outputted from the integration circuit. |
