Camera Power
Document Camera – Powerful Presentations Teaching Tool
The use of Document cameras for teaching enhances the productivity of the lessons and efficiency of the instructors to deliver lessons. Document cameras add interactivity to the lessons and visualizations of the subjects in the classroom. Document cameras are used to display any text material, slides, negatives or any 3-D object with high resolution clarity. Document cameras are excellent and powerful ICT (information and communication technology) tool to teach and demonstrate more effectively. Document cameras project the thing onto the projection screen, interactive whiteboard, plasma television and computer. The document cameras comprises of video camera that projects documents, objects and images on a variety of display devices such as interactive whiteboard, screen, and television set.
Document cameras are most popular ICT (information and communication technology) based teaching aid among teachers these days in the schools, colleges and the universities after interactive whiteboards. Document cameras have a presentation base to place the text or object. Document cameras have a motorised head to allow flexibility in covering the document and objects in both horizontal and vertical direction.
Document cameras have side LED lights and base LED lights for viewing the things in dark room, converting the positives into the negatives, transparencies and slides. Document cameras come with Remote Control having controls such as zoom, color, and positive/negative, save and recall enhancing the presentations. The instructor can display books, notes and documents to the entire class with the document cameras. Teacher can do live annotations on the paper or use interactive whiteboard to annotate on the real time object with the document cameras. Educator is able to display 3D items such as insects, fossils; geometric solids etc in very minute detail to the students and a specific part can be zoom in or zoom out. Live demonstrations such as how to use a ruler, how to do experiment can be shown to the whole class and these events can be recorded as a real time video with the help of the document cameras. Document cameras are replacing the overhead projectors with the advancement of the ICT (information and communication technology) in to the education. Document cameras have a number of connections to the projector, interactive whiteboard, computer and television.
Document cameras can capture images of the documents, 2D or 3D objects and any thing in the real time. The zoom feature of the document cameras allows the students to view the flower components, mould and rocks in minute details. The 2D, 3D objects and other scientific samples can be visually explored as a whole class by the document cameras. Since the document cameras are able to capture the things, there is no need for photocopying. The captured images can be recalled later and can be shared on the network of computers as a resource for learning and teaching. Document cameras can also be used to create 2D or 3D animations. Some Educators integrate interactive response system with the document cameras in their presentations. They can create a question slides embedded with video of science procedure and a teacher asks the student questions about the procedure.
About the Author
Author has written lots of article on Document Camera, ICT Products, Visual Presenter Audience Response System etc. which helps the student and teacher make their education Interactive.
How do i change the power plug of a wireless camera to a battery power source?
I have this wireless camera but it has an outlet power source and i dont want any wires, so, can i change it to be battery operated, if so how?
Look at the label on the outlet power source for the "output" specification. Then, go to radio shack and get a battery holder for AA batteries. Example: 8 AA holder = 12 volts ; 4 AA holder = 6 volts, etc.
Typically a webcam is probably 12 volts. If the power connector to the power source is direct wired, you'll need to cut the wires and attach the battery holder by soldering it to the proper cut wires. If on the other hand the camera has a special connector to plug to the power adapter, simply get the right connector and do some soldering again.
Camera Power
Newegg TV: OCZ ZX Series Power Supplies - Product Tour
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12VDC 9 CAMERA POWER SUPPLY $115.99 12VDC 9 CAMERA POWER SUPPLY |
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Axis Power Adapter for Network Camera $56.99 5500-221 9 V DC 9 W Axis 225FD Fixed Dome Network Camera AC Adapter Axis Axis Communications Power Adapter for Network Camera Surveillance/Network Camera www.axis.com |
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Power Cord Hidden Camera $350 The Desk Accessory You Didn't Know You Needed Office theft and vandalism happen every day. The Power Cord Hidden Camera is an inconspicuous camera housed in a standard-looking power cord that sits on your desk and records everything that happens while you're gone. Its slim, sleek and discreet design doesn't draw any extra attention. The device looks like an ordinary charger or computer cable, so no one will think twice that it's anything other than a loose cable forgotten on your desk. If you suspect any wrongdoing to your property, or you work in an environment that makes you suspect that your belongings may be in danger, this is the device for you. Simply pair the camera with any of a number of portable DVRs, plug it in, and you're ready to start recording. And, with a built-in motion sensor, you'll only get the footage you need. Choose Your Own View This power cable hidden camera makes a great partner to any number of portable DVRs. By pairing this camera up with a DVR with a viewing screen, the Power Cable Cord Camera acts as a low-cost snake cam. With its 3-foot adjustable cable, its easy to insert the device into hard-to reach spaces and see what you otherwise wouldn't be able to. You can even adjust the camera angle by simply twisting the end of the cord! Key Features: Small and portable, use it to keep an eye on your home office or cubicle at work, when you can't be around. No professional installation is necessary; no complicated or hard-to-read instructions with the Power Cable Cord Camera. It's an easy-to-use, plug-n-play camera type that fits perfectly with any compatible DVR. It's a perfect camera to add to your collection- its unique size and discreet design and desktop application makes it a must-have for anyone who's interested in capturing quality covert surveillance. Using the compatible DVR Handheld add-on accessory (sold separately), you can easily email and share your recorded video for distribution for legal matters, for your own records, or even just to share a hilarious YouTube-like moment with family and friends. What's in the Box Power Cable Cord Camera 9V Power Adapter RCA Cables |
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PG-21 Power Grip for the SD-14 Digital SLR Camera $174.95 Sigma's PG-21 Power Grip for the SD-14 Digital SLR Camera |
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Network Camera Power Supply $49.99 Optional AC power supply for select Network Cameras |
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Mace Proprietary Power Supply $90.91 12VDC 9 CAMERA POWER SUPPLY |
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Strength-Power skin for BlackBerry Tour 9630 (with camera) $14.99 Strength-Power skin by Skinit.com. Fits BlackBerry Tour 9630 (with camera). View this and other covers, skins & case accessories at Skinit. |
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Flower Power skin for BlackBerry Tour 9630 (with camera) $14.99 Flower Power skin by Skinit.com. Fits BlackBerry Tour 9630 (with camera). View this and other covers, skins & case accessories at Skinit. |
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WATERPROOF B/W Camera IMAGE w / Car power $225.08 DSP B/W Camera WATERPROOF IMAGE w/ car power source |
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Color 1/3 Sony CCD Camera Kit w/ Controller and Power $588 Color 1/3 Sony CCD Camera Kit w/ Controller and Power |
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1/3" Ccd Camera $98.99 POWER ACOUSTIK LP-1CA LICENSE PLATE COLOR CAMERA |
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Rechargeable USB Emergency Power Backup Pack for Cellphone and Camera(4800mAh) $27.62 Rechargeable USB Emergency Power Backup Pack for Cellphone and Camera(4800mAh) |
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NEW 36IR Waterproof Camera FREE Power CCTV Security $25.26 NEW 36IR Waterproof Camera FREE Power CCTV Security |
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36 LED SONY CCD Waterproof camera FREE Brackat/Power 4pcs/lots $115.79 36 LED SONY CCD Waterproof camera FREE Brackat/Power 4pcs/lots |
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Multi-connector cable for power audio and I/O - Camera cable $136.99 AXIS Multi-connector cable for power audio and I/O - Camera cable |
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100ft Camera Extension Cable Black Power/Video Cable $16.99 100FT CAMERA EXTENSION CABLE BLACK POWER/VIDEO CABLE |
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Sony FA-CC1AM Off-Camera Power Interconnect Cable for Flash - 4.92ft $48.79 OFF-CAMERA CABLE |
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Wholesale - 1Pcs/lot New IR Wireless Pinhole mini Hidden Camera for CCTV Security DVR+ Power $22.63 Day&night camera |
I Have The Power – CCTV Power Needs
When building your surveillance system you will need to select a cctv power supply. This can be a little more involved then simply plugging an adapter into the wall. Lets address a few of the features and differences amongst cctv power supplies.
Single Port Vs. Multiple Port
The name says it all. Are you going to use a single port power adapter at each security camera; or are you going to have a single power box to supply power to all of your cameras? If your surveillance system only has a couple of security cameras; then it may be a good idea to just use a single power adapter at each camera. In fact even four camera adapters all running to a power strip may not be a big deal.
Neatness and a clean installation can be quite an attractive option however, and it may be a more ideal situation to have a single power box supplying power to your entire system; especially if you have a large number of cameras. The choice for this is really dependent on the user and their power requirements and aesthetic preferences.
DC vs AC Power Supplies
Security camera power supplies for the majority of time have been 24VAC. Throughout the past 10 years the advent of smaller more compact and covert cameras has led to an increased number of 12VDC options. Both of these are lightly regulated (low voltage) for construction which allows flexibility in surveillance installations.
12VDC
12VDC uses a smaller footprint for security cameras because it does not need a rectifier. Although this type of power supply was originally designed for covert surveillance applications, it has become quite popular for larger C/CS mount type security cameras. On the downside 12VDC is not a good solution for long cable runs and in fact the 12VDC power boxes can cost more than their 24VAC counterparts.
24VAC
These power supplies are often simple transformers distributed through multiple ports or used in a single application. The advantage to these power supplies is found in the cost of multiple port units, as they have a reduced amount of components needed. Another advantage is their ability to keep a solid power signal over longer cctv cable runs.
Mixed Surveillance Systems
Through the use of power converters many surveillance systems will use a mixed assortment of power supplies both 12VDC and 24VAC. These converters allow 24VAC voltage to be regulated down to 12VDC. If a converter is going to be used in a system you want to make sure to allow for overhead on the current rating. For example if you use a 12VDC 400ma power supply; then you are going to want to use a 800ma AC to DC converter. This will help avoid potential conversion failures.
Should You Fuse
Most multi camera surveillance systems use a multiport power supply with either a glass fused or PTC (circuit breaker) overload protection.
For most applications fuses are preferred, but in many situations the use of the PTC type allows for an automatic reset of the fuses once the power is removed and then restored. The downside to this system is that the PTC system can take too long to react and it may not offer the proper power protection that you would get from a properly rated fuse. In fact there are occasions where a PTC will fail completely; leaving you with a dead port.
Generally fuses are recommended, but if a PTC system is designed; it is a good idea to have extra ports on hand.
About the Author
Christian M Gillman has worked in the surveillance industry for over 6 years. Subscribe to our monthly newsletter, learn more about surveillance, and find great products at http://www.cu1.com
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