Date: Tue, 4 Mar 2008 12:24:33 -0500 To: puptcrit-AT-puptcrit.org From: joe-AT-dunfee.com Subject: Re: [Puptcrit] two overheads projectors ganged together A single 3-way household wall switch can be wired to flip between two lights. It has been perhaps 20 years since I did that, so I don't recall the details. An electrician might be able to help. But, I am not so sure this is a good idea. Many projectors have fans that stay on for a while after the bulb is turned off. Also, regarding dimming, some projectors (many nowdays), have an electronic powersupply that doesn't like to be dimmed, and will actually fight to keep the bulb at the same brightness. Mechanical dowsing sounds like the best option. I know that in the theater maillist I am on, several people have talked about adapting a CD-Rom drive to do this. They connect to the electric motor that moves the tray in and out... but I don't know the details. Another option for electrical control of the douser is to use Radio Control servos. There are electronic kits (about $40 to $50) to give you direct-wire control over a servo. You can then connect the servo to an opaque disk of material in front of the lens so that it moves in and out of the beam. Let me know if you want to know more about the electrical control of dousers, and I can do more research. Joe Dunfee _______________________________________________ List address: puptcrit-AT-puptcrit.org Admin interface: http://lists.puptcrit.org/mailman/listinfo/puptcrit Archives: http://www.driftline.org
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