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 21 
 on: Yesterday at 10:39:23 pm 
Started by Mike Sokol - Last post by Stephen Swaffer
I think it's very possible to try and teach too much to lowest tier hotel AV techs.  I think I'd start with a "go/no-go" module and then delve into theory after lunch for those still interested.

The very first post in this forum is about a hotel meeting room with an Edison power outlet that's labeled "microphone."  I don't expect hotels to do much better.  I agree that meter everything is best practice and one I use, but even at my level of interaction I don't care if a service is 480v delta or 208/277 high leg or 120/208/240 if I don't get the correct meter readings.  I can't change it - my only recourse is to not use it and get someone from the hotel or convention center to label it.

Again I'm all for knowledge (except for forums run by Social Knowledge, but that's another matter) but I think this needs to focus on safety of personnel, guests and equipment.  The *theory* behind 'unsafe for our use' services is nice but unnecessary for most AV techs. All that is necessary is for techs to recognize over voltage and not use it.

This all said, I'm guessing there is a story or 2 behind this request.  Can you share?

I would disagree to an extent.  I realize my background is industrial-but there is no technical reason not to install a 3 phase load only panel in a commercial facility to supply HVAC loads, etc.  The first 3 phase panel Mike showed was designed for such a use-no isolated neutral bus.  A panel like this will have the correct voltage readings-but on a 200 amp panel the difference between a properly sized grounding conductor and a properly sized grounded (aka neutral) conductor is from a #6 to a 3/0.  Similarly a 3 phase receptacle with a grounding conductor but no neutral would be likely to have too small a conductor to run single phase loads.

This "hack"-using a grounding conductor as a neutral is a code violation and a very real safety issue-and it is one of the most common ones I see (short of ignoring the importance of the grounding conductor/safety ground).

In my opinion, knowing how to check voltages is critical-as is determining if a 3 phase power source is a legitimate source of single phase power.  The "wye"-"delta" determination Mike originally mentioned-but the critical thing is if the 4th wire of the "wye" is available at the panel/receptacle-not necessarily if the transformer is delta connected.

 22 
 on: Yesterday at 09:35:05 pm 
Started by Steve Garris - Last post by Steve Garris
Great!  Always happy to lend useful advice! 


Have you thought about a small but capable hardware console?  While I have yet to get hands on one, the QuickQ Series from ChamSys is quite promising.

I'm a weekender (lounge) that works pretty much every weekend. I operate out of a minivan, and budget is pretty limited. I'm pretty happy with a bunch of good scenes, a master, and the ability to quickly change the fade rate between scenes. In the old days those little NSI controllers made this an easy task, but with led and even my cheap movers things are certainly more complex.

In addition I work with a "project band", basically a bunch of seasoned musicians doing hair rock 80's covers. We make a big deal out of our shows, and the lights have become an increasingly larger part of the show. We do about (6) shows each year at a local club that has a light system that runs via a midi push-button controller, so our light guy has to busk using both this and my iPad with Luminair. The band owns lights, I have a bunch, and we hang them all up together. I've been programming all of the scenes which work both with my lights, the band's lights, or both combined, in the case that we're using them at another location, or for my other gigs. I'm doing more and more sound system/operator/light rentals than any time in the past, so I'm looking for simple solutions that are not too costly ($400-500 max software). Our lights consist of mostly very cheap, Chinese fixtures, but in large quantities they are shockingly effective.

My plan is to learn this midi-dmx, and fully program their show start to finish. In the process, I'll end up with a huge library of scenes, and can busk using the Mac laptop. This is where a chase, and a tap sync come in handy. If I'm successful programming the band's light show, I intend to sell this programming to other bands as a service.

If got a lot of research to do, but I'll check in with you from time to time. Really appreciate your expertise!


 23 
 on: Yesterday at 08:33:53 pm 
Started by Eddy Roswell - Last post by Caleb Dueck
Ouch.
What was the reply?

Chris

Silence, then turned to someone else and changed the topic. 

 24 
 on: Yesterday at 07:58:07 pm 
Started by Debbie Dunkley - Last post by Chris Hindle
My worry would be, what if I am setting up an iPad for my Father or a neighbour, and it clones mine?
(At this point, my wife has a pad, but I don't.)
Chris.

 25 
 on: Yesterday at 07:23:41 pm 
Started by Patrick Campbell - Last post by Frank Koenig
Like below?.......need to get a few more myself..

I think this link is them....not sure.. Plug

Yes, like that. Next time I do a rack that can use these I'll know where to start looking. Thanks. --Frank

 26 
 on: Yesterday at 07:15:25 pm 
Started by Debbie Dunkley - Last post by Bob Stone
There's no AI going on there, what happened is programmed based on some criteria as to which device to pick (probably most recent use).

At this point there's no need for paranoia with AI, it's not that smart yet...but it's coming.

 27 
 on: Yesterday at 07:11:57 pm 
Started by Bradford "BJ" James - Last post by Bob Stone
4 x 6' sticks of F34 truss weigh 124lbs alone, another 12 lbs for the truss adapters, another bit for pins and such. The ST132 is 220lbs each, so 440lbs total. That means remaining capacity of 300lbs roughly at best when evenly spaced (e.g. not heavier over one lift). Are you certain that this customer is going to be able to rig this all appropriately and within capacity? 300lbs disappears really quickly depending on the light fixtures and cabling used.

 28 
 on: Yesterday at 07:03:37 pm 
Started by Tom Bourke - Last post by Mike Caldwell
Is it only on the one mix you select in the video that is the problem or does it do that with any function, layer change, other mixes, FX, graphic eq mode.

 29 
 on: Yesterday at 06:30:12 pm 
Started by Mike Sokol - Last post by Mike Sokol
Check this out. I found a 3-phase signal generator from China for $31.88 with shipping. Signal level appears to be 5 volt P-P which would drive any small power amp nicely. https://www.ebay.com/itm/1-00-200KHZ-3-Phase-Sine-Signal-Generator-0-to-360-Frequency-meter-Counter-/172793617133?_trksid=p2349526.m4383.l4275.c10#viTabs_0

Circling back to the top of the thread, adding a pair of the Lepai 2020 amplifiers at $20 each might be the best choice for a voltage-only 3-phase demonstration. And these little transformers could get the voltage swing up to 120/240-volts as well as Delta or WYE configurations. 

If this works (and I'm reasonably sure it will), then it's certainly cheap enough, small enough and simple enough for a tabletop demonstration.

 30 
 on: Yesterday at 06:29:34 pm 
Started by Bradford "BJ" James - Last post by Mark Cadwallader
It all depends on the loading, in my somewhat limited experience. I have 2 m and 1 m segments of Global Truss,  and have gone out to span 13 meters (43') for front lighting presentations in a meeting room, without problems.  2 meter (6.5') lengths of truss are easier to deal with than 3 m/10' sticks for lounge level folks like me and my rental clients.   YMMV.

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