| 摘要 |
PURPOSE:To always attain normal operation without causing abnormal operation in a horizontal output circuit by applying a power voltage varied by a voltage variable circuit as a control voltage of the oscillation circuit. CONSTITUTION:The output voltage VfH of an fH detection circuit 9 is inputted only to a VCC variable circuit 11 and the VCC variable circuit 11 is controlled by an output voltage VfH of the fH detection circuit 9. Thus, the power voltage VCC of the horizontal output circuit 8 outputted from the circuit 11 is proportional to the inputted horizontal synchronizing signal frequency fH. On the other hand, the power voltage VCC from the circuit 11 is inputted to the variable horizontal oscillation circuit 7 and the oscillated frequency fOH of the circuit 7 is controlled by the voltage VCC. Thus, the oscillated frequency fOH of the variable oscillation circuit 7 is proportional to the voltage VCC, that is, the inputted horizontal synchronizing signal frequency fH. Thus, the normal operation is applied at all times in the horizontal output circuit 8. |
