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Video fader

Video fader
If you try to attenuate a video signal, there is a point at which the picture hecomes unstahle rather than weaker. This happens because the sync pulse are attenuated also. and the monitor's internal picture timing circuits go into free-running mode, being unable to detect a valid input signal. This prohlem may be solved by applying a separate sync signal and attenuating the video component only.
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