| 摘要 |
PURPOSE:To enable to adjust a vertical flyback pulse width, by adding a pulse width adjusting transistor (TR) in series to an output TR of a power supply pump- up circuit. CONSTITUTION:A saw tooth wave is inputted to an input terminal 10 of a vertical deflection output circuit 10, and a deflection current is supplied to a vertical deflection yoke 7 from an output terminal 11. A power supply pump-up circuit 2 is connected to the output terminal 11, a capacitor 4 is charged up to a power supply voltage Vcc at a vertical scanning period, and 2 Vcc is supplied to a vertical deflection output circuit 1 by superimposing it to the Vcc at the vertical flyback period. A load TR34 and a pulse width adjusting TR39 are connected in series with an output TR32 in the pump-up circuit 2. The flyback pulse width can e adjusted with a variable resistor 41 connected to the base of the TR39, allowing to set the optimum flyback period. |
