| 摘要 |
The circuit constantly maintains the brightness of the screen by controlling the output level of the video in response to the deviation mode. The circuit comprises a transmission line for transmitting the signal from a microprocessor, a switching means (20) for selecting the video deviation mode according to the level of the signal from the microprocessor, and two variable resistors (VR1,VR2) connecting with the switching means and the video amplifying means. The switching means consists of two transistors (Q3,Q4).
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