| 摘要 |
To produce a cathode voltage of a cathode ray tube that provides black level compensation, a secondary winding of a flyback transformer is coupled in series with a resistor, a capacitor and a rectifying diode. During flyback, a voltage pulse is developed across the capacitor at a magnitude that is increases when the average value of the beam current increases. The voltage pulse causes the cathode voltage to first decrease when the beam current increases.
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