| 摘要 |
PURPOSE:To make a color killed don't operate even in a receiving state a weak electric field, and to obtain a circuit of simple constitution, by utilizing a horizontal synchronizing pulse controlled by a fly-back pulse, and making it execute the gate operation. CONSTITUTION:A horizontal synchronizing pulse is provided to the input terminal 1, is rung by the resistor 2, the inductor 3 and the capacitor 4, is delayed to the insertion time position of the prescribed burst signal, and it is output by the output terminal 11. The emitter of the PNP transistor 5 is connected to the output terminal 11, the collector is grounded, and moreover as for the base, the resistor 7 is grounded through the resistor 6, and also it is connected to the terminal 10 through the coupling capacitor 9. A fly-back pulse is provided to the terminal 10, and the impedance between the emitter and the collector is lowered by turning off/on the transistor 5 during said providing or tracing respectively. |
