please give me details about over head projectors?
94716
One of the previous people who answered is correct in that the old-fashioned type of overhead projector is pretty much an obsolete technology.  However, with that said, many schools till use the old ones for the simple reason that they have them, and there is no money to buy the newer technology.  They also lend themselves to use by students in that they are less expensive, so less is lost if the kids cause damage. \n\nThe old projectors had a few problems in that for sure when you were in the middle of your presentation the light bulb would burn out.  The other problem was preventing the image from being "skewed" on the screen - there is a term for this but I've forgotten what it is.  Sometimes the mirror broke because of being handled roughly, but they are pretty sturdy machines.  Some of them were quite noisy because of the cooling fan - the bulbs get quite hot.  The room needed to be quite dark for them to work well, so that, combined with the continuous buzz of the fan and the stuffiness caused because the curtains were closed, tended to put the audience to sleep. \n\nThey have other advantages in that they are fairly simple to use and require no particular techincal skill.  You just write or draw your information on pieces of plastic called acetate or transparencies, using special markers made for overhead projector transparencies, and lay the plastic on the projection surface to project the image.  It was easy to get confused about the correct way to lay the acetate on the projector!!  YOu can use the acetate the same way as a chalkboard or whiteboard and write on it as you are teaching - the advantage being that you can face the class whie doing it - you don't need to turn your back to them.  Theoretically, you can use your computer to make "overheads" and print them.  However, in my experience, printing the transparencies often fouled up the printer!!\n\nThe newer projectors, no longer called "overhead projectors", are connected to a computer when in use, usually a laptop, and offer a much more sophisticated repertoire.  YOu can use Power POint to prepare presentations and have everything stored on  your laptop.  If you are using a video, Internet, or a TV segment in your presentation you can route it through the projector.  These projectors are smaller, lighter, more compact, definitely more trendy.  Today a professional presenter who showed up with the old type of overhead projector would be considered a bit behind the times.  You can incorporate the use of a laser pointer, remote control, etc. with these new projectors.   However, though they are getting cheaper, they are still much more expensive than the older models and require considerably more technical know how for operation.  When something goes wrong, it is often beyond the presenter's expertise to fix it so you often have to call in the IT person!!!\n\nThere is a device called a "palette" you can buy to sort of transform one of the older models into a model that will work like the newer ones.  I wouldn't recommend it.  If you are going to move to newer technology I would recommend skipping the half-way measure.\n\nI hope this is informative and of some help.
182055
Spector Pro is the best I've found: http://www.spectorsoft.com/
1016840
Use a 7106 or 7107 IC.  They provide analog to digital conversion and drivers for a liquid crystal display.  The source in "references" provides kits to make a panel mounted ohm or volt meter using these ICs.  \n\n"Google" these ICs and you will find more.
674518
http://player.interactual.com/help/support/articles/0137.asp\n\nhttp://www.sonic.com/products/Consumer/CinePlayer/Technology/performance.aspx\n\nhttp://www.microsoft.com/windows/windowsmedia/mp10/getmore/plugins.aspx\n\nhttp://www.daniweb.com/techtalkforums/thread14054.html\n\nhttp://www.wmplugins.com/ItemDetail.aspx?ItemID=663
145617
Your choice for the scree depends hoe you intend to use it ie business,games , video editing ,etc\n\nIf you will play a lot of games you will require at least 17 inch if not more with a high refresh rate.\nThe brands that you can have varies on locations .\nCheck out some reviews below and see if you can find one to fit your requirements.
272048
a transparent glass TV and media system utilising holographic technology.\n\nThe Holoscreen is a revolutionary holographic film which displays any image fed through a projector at a specific angle on to a transparent display. All other light is ignored. The result is a remarkably bright and sharp image quality - even in brightly lit environments. The screen is a 1.5m x 1.0m rectangle of 10mm glass with a 610mm x 814mm sheet of translucent attached to it. Any type of projector can be used to cast the image. To complete the futuristic setup, a pair of optional Ferguson Hill FH001 speakers can be positioned either side of the screen. \n\nLooking more like space-age satellite dishes the speakers stand an impressive 1.65m high by 0.92m wide by 0.72m deep. The whole system sells for UK£25,000 of which the speakers make up UK£9,999 of the price tag. They are driven by modified Lowther DX3's. \n\nThe projector renders a huge forty inch image on the glass screen that seems to hang in mid air. Due to the science of the angles involved the image seems bright and clear even in an environment with plenty of other light about. The projector can take various simultaneous inputs such as TV, DVD and computer. In a standard instillation the projector sits on the floor about 5 feet behind the screen, so while the bulkiness of rear projection screens has literally vanished, it actually occupies a greater amount of space.
163730
If you mean adding monitors to your system there are a couple of things you can do. One is buy a card with multiple heads, or connections for display. Most cards you can get at the store are dual-head and have either two VGA connectors or a VGA (The blue connector coming out of your monitor) and a DVI. You can get an adapter for the DVI to make it VGA.\n\nThen on the internet you could get professional cards with up to 4 heads. (A Matrox for example.)\n\nSecond you can put an extra video card in, even though only some card types can work that way. (Matrox again)
547369
check http://www.pricewatch.com \nthey usually have links to just about every bit of hardware known to man.
754808
mmmmm.........i think you guys have really underestimated what your in for :P.      for starters just a pc and a tv out graphic doesn't cut it for broadcasting.      now for the software vizrt are the standard in the industry,  their software is awesome its a bit to get your head around at first.   we use it a lot for the work i do and the results are nice :)   if you plan on broadcasting live with these features then you will need more than one computer,  maybe 3-4.     its just too much of a workload for one.      as for hardware grass valley hardware would be the standard to with video and broadcasting.           \n\ncheck out their websites for more info :)\n\nwww.vizrt.com  \nhttp://www.thomsongrassvalley.com/
497211
Use Spector Pro.  You can see EVERYTHING they do.
1143316
Speakers: 2x1 watt \nAmplifier: 1-watt @ THD < 8% \n\n^ ^ these are u'r speakers\n\nSorry pal, u'r picture quality maybe great, but the built-in speakers are not !\n\nTHD (total harmonic distortion) of 8% is sure aweful 4 sound quality.\nIf you doubt u'r sound cards abilities, check it out with a headphone and compare v/s Viewsonic speakers
952485
What do you mean by write configuration?\n\nI would consider any Dell Lcd as they are very good quality, and offer good performance for the dollar.
160012
Go to this page and see the reviews for good LCD monitors.\nhttp://reviews.cnet.com/Monitors/2001-3173_7-0.html?tag=cnetfd.dir
208158
Try eplans.com.  They have a great search that lets you enter all of the sizes and features that you want.
14136
I'm currently using one similar to below.  Love it to death.\n\nIf you go with LCD, be sure to use the DVI connection and not analog.  Makes a HUGH difference in quality, especially in movies and games.
426759
chk these sites\n\nhttp://www.play-hookey.com/digital/experiments/seven_seg_driver.html\n\nhttp://www.geocities.com/dsaproject/electronics/led_display/led_display.html\n\nwww.ece.umn.edu/class/ee2301/lab/EE2301Exp5F05.pdf\n\nwww.ece.umn.edu/class/ee2301/lab/EE2301Exp5F05.doc\n\nwww.engr.sjsu.edu/wdu/Mechatronics/ Fall2004/LabManual/Exp5_Digital%20IO_%20Atmel.pdf\n\nwww.engr.sjsu.edu/bjfurman/ courses/ME106/ME106pdf/digitalIO-atmel.pdf\n\nwww.ibiblio.org/kuphaldt/socratic/output/display.pdf\n\nwww.ibiblio.org/obp/books/ socratic/output/display_instructor.pdf - Supplemental Result\n\nwww.ruf.rice.edu/~dodds/Files331/digi_expt.pdf\n\nwww.tech.purdue.edu/eet/ courses/eet109/labs/prelab%2011.pdf\n\nmng.1432@gmail.com
274288
Try the links below. The amazing 3d link has all of the things you are looking for