We'll I got a superb deal on a custom 100" 16:9 Draper Access/V M1300 screen, from an inventory solutions company, that basically liquidates customer returns, cancelled orders, demo's, etc. Ceiling recessed, tab-tensioned, electric screen for less than half the price of a new Elite version!

Any way I figured out how to trigger the screen with a simple $8 relay, but I need a projector with a 12v output. I was getting pretty set on the Mitsu hc3000u but the huge offset won't work for my setup (104.5" ceiling height with the screen bottom fixed at 38" from the floor). Mitsu would put the sreen bottom at 33"

Next was the Sharp DT-500. Looks good, if not better compared to the Mitsu. I prefer a white case (ceiling mount), 5X color wheel, full gamat of inputs (HDMI, component and SVGA), priced under $1500, but alas no 12v output and I'll have to raise the lower limit of my screen 5", setting it at 43" - a bit high.

Any ideas on how to send a sufficient DC signal to the relay to trigger the screen on a projector with no 12v output? Anyone ever try an "AC Current Sensor"? Basically a transformer that outputs DC current when AC current is flowing thru it.

Sears sells a Craftsman branded 'auto switch'. It has three outlets - when the 'master' outlet draws current, it turns on the other two. It was originally designed for power tools (turn on the table saw and the auto-switch automatically turns on your shop vac and a light, for example).

I use one to automatically turn on a fan in my media cabinet when I turn on my electronics. If my xbox (XBMC) is on, the fan is sucking air out (my Wii apparently doesn't pull enough current to trigger it though).

I don't know much about the screen relay circuit, but this device would basically add a 120v trigger to your projector, right? Might help your plans somehow?

I'm not so sure the Craftsman auto-switch would work. I could wire it so the screen goes down when power is applied, but it won't return up when power is cut. It needs a constant power supply with a relay providing the up/down switching. At least that's what I believe.

http://www.avsforum.com/avs-vb/showthread.php?t=795038