Electronics > Beginners
Power wise to put on a big concert must be incredible
mikeselectricstuff:
--- Quote from: Nitrousoxide on July 17, 2018, 05:21:13 am ---The most annoying thing is eliminating ground loops... and bloody video LED walls, those things radiate more EMI than the sun....
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I'd guess they are EMC tested only as individual modules (maybe with a "favorable" test pattern..)
AndyC_772:
--- Quote from: mikeselectricstuff on July 18, 2018, 05:52:13 pm ---What was this down to ?
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Class D amplification, perhaps?
JS:
Been on a few biggish stages, for 20k people or so... I don't remember but in the order of 100kW seems reasonable.
Once (or twice) on a bad tap from the electrical network and you have the guy next to the volt meter telling the guy on the lighting desk how many lights he can use at once, funny |O
We used the best phase for audio and the other two for lights, no sharing a single cable anywhere else but the main board, quite easy as audio and lights are different teams so the only time you need to agree is to bring the wires from stage to FOH.
This was many years ago, on my late teens, for this year edition I was around and they called the electric company to install a new transformer and have an emergency generator for a few 100kVA ready to go right next to the stage, it wasn't funny anymore.
JS
schmitt trigger:
And of course , there is the famous album cover by “The Who”, showing the band sitting and standing on top of huge crates of heavy duty cabling.
The album “Who Are You.”
james_s:
--- Quote from: mikeselectricstuff on July 18, 2018, 05:52:13 pm ---I always wonderd if these reduce the power when the shutter is closed, so they stay lit but draw less.
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As far as I know they don't, most HID lamps don't really like being dimmed, MH dimming ballasts do exist but they require some fancy tricks to keep the cathodes from cooling which causes them to sputter and blacken the arc tube. Since the lamps tend to be quite expensive I'd imagine the power consumption is secondary and the added complexity of drive electronics capable of dimming without causing reduced lifespan would not be worth it.
I would expect that development of HID sources has pretty much frozen these days anyway and LEDs will eventually take over everything of this sort.
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