Grounding can be bad sometimes
Posted by marc, Sun May 27 22:32:11 UTC 2007
So, what did I do this weekend? I watched the DFB Cup finals at a friend's new flat.
We used a beamer and a VCR to get the TV Signal stretched to a decent watchable size on the wall :)
This setup poses some difficulties though. Because of the two sources of grounding (on the TV-Cable and on the power cables), the analogue signals get distorted and the signal/noise ratio begins to suck and visual distortions begin to manifest in the picture. Colors/crightness/contrast begin to look strange and the picture starts "jumping" (up to the point where to top half and the bottom half of a frame are "split")
Thanks to a savvy tech monkey we got a clear picture in the end by removing the grounding of the TV Cable and blocking the grounding of the "schuko" plug by a piece of paper :)
Who needs grounding on a beamer with a complete plastic casing anyway...
p.s. you could die if you try this at home... so DON'T!!!!!!
This setup poses some difficulties though. Because of the two sources of grounding (on the TV-Cable and on the power cables), the analogue signals get distorted and the signal/noise ratio begins to suck and visual distortions begin to manifest in the picture. Colors/crightness/contrast begin to look strange and the picture starts "jumping" (up to the point where to top half and the bottom half of a frame are "split")
Thanks to a savvy tech monkey we got a clear picture in the end by removing the grounding of the TV Cable and blocking the grounding of the "schuko" plug by a piece of paper :)
Who needs grounding on a beamer with a complete plastic casing anyway...
p.s. you could die if you try this at home... so DON'T!!!!!!
