Showing posts with label how. Show all posts
Showing posts with label how. Show all posts
Monday, April 8, 2013
How to choose the best for your home theater system
Watching movies is a neat escape from the stressful lifestyle we live in. Watching movies in a wide screen and surround sound take you far away and into the movie scene you are watching. You watch it as if you were there in the movie scene. Of late, we can only experience this escape in a cinema. However, modern technology may be able to provide this same sight and sound experience right in your own living room. We will discuss the basic components of a home theater system in this article. Read on to understand how these basic components can deliver the best cinematic experience to a home theater system.
Home theater experts state that the most important consideration in setting up a home theater system is the size of the room where you will set up the home theater system. The most important component of the home theater system, which is the television, is dependent on the size of the room. Although, the recommendation is 27 inches television set at a minimum is necessary for your home theater set up. It is also a recommendation that a flat television is good for a home theater system because it exhibits fewer glares and produces a crisper image. Another major component of a home theater system that depends on the size of the room is the speaker. The number of speakers for your home theater system is dependent on the size of the room. You may add up to six speakers from the basic three speakers if you want a more lifelike sound. Adding a subwoofer may also be good to achieve a complete surround sound like in the movie theaters. Three speakers should be the minimum; you may go up to six if the room is big.
Another major for your home theater system is the DVD player. It is a recommendation that DVD players with progressive scan will be the best choice. This is because progressive scan produces sharp and flicker-free pictures. This however points back to the choice of television unit; you may need to check if the flat television set supports progressive scan signals. You may also acquire a five-disk carrousel DVD player. This will avoid having to stand up from your seat to change discs every so often. A minor consideration is the power rating that will determine how loud your speaker can be. Of course, almost all these depend on the size of the room to where the home theater system is going to be set up. Small room requires from few types of equipment, bigger rooms may require more and adding home theater furniture to your home theater system may be best. A bigger room thus requires more investments. A smaller room might require fewer but of good quality equipments to avoid the too basic feel of the home theater system.
Finally, you may acquire a beautifully designed home theater system if you consider hiring a home theater expert. If you can afford this, it will be best for you because the home theater expert will be able to effectively design and set up your home theater system. Your home theater designer may also add some features like home theater seating and other home theater furniture to be able to give the complete home theater package that closely resembles a real movie theater. Having the finest and high-quality home theater system will give you the most sought after set up that you could flaunt and enjoy to the max.
Sunday, April 7, 2013
How to Make a Simple Electronic Weighing Scale Machine
Learn a super simple procedure to make a weighing scale device useful for measuring smaller magnitudes of weight. The concept is very simple, a light beam is allowed to pass through a linearly colored ribbon and fall over an LDR. The color shade of the ribbon positioned in front of the light source at any instant will depend on the weight placed over a spring loaded mechanism. The corresponding change in the light level is converted into a corresponding difference in the resistance of the LDR which is ultimately read over an Ohmmeter and the equivalent weight is determined.
A digital weighing scale is an indispensable device as far as determining smaller magnitude of weights is concerned. However these gadgets can be too sophisticated and expensive to procure. A simple design idea of a weighing scale presented here promises to be equally accurate yet very cheap.
Introduction
We all have seen this machine very commonly used with most of the shopkeeper and retailers. It is used for determining the weights of the various materials being sold to the customers so that the items may be correctly rated as per the displayed weight over the machine. This incredible device is able to detect even the minutest magnitude of weight placed over it and accurately displays it over a digital scale.
Yes we are discussing weighing scales normally used for weighing smaller weights ranging from probably mgs up to a few kgs. The commercially available weighing scales are rather too sophisticated, accurate and therefore very costly too.
The design of a simple electronic analogue weighing scale presented here has been devised by me and is pretty accurate, very low cost and can be constructed even by a layman. The idea is simple – a linearly colored semi-transparent ribbon is made to move or dip in response to the pressing weight, a light beam from a light source is allowed to pass through this ribbon and fall over an LDR. The LDR is connected across an Ohm meter, so, as the weight pushes the ribbon, it slides down and settles at a particular point and offers a particular corresponding shade in front of the light source. The light intensity is optimized according to the darkness or lightness of this shade and the LDR reads the proportionate light intensity level and directs it to the meter so that it may be directly read over its calibrated dial.
Let’s try to understand the actual functioning of the designed prototype:
Electrical and Mechanical Description of the Unit
Referring to the figure alongside, we see that the arrangement is pretty straight forward. A central pillar or shaft which forms the main and the sole moving part of the system passes through an appropriately sized hole made over the top surface of the cabinet.
The external end of this rod terminates into a flat platform which forms the base for keeping the weights under question.
The rod and the platform are held in a rigid posture by a spring positioned in between the platform and the cabinet top surface. The shaft actually passes through this spring. The spring is required so that the weights are properly optimized and the level of the platform returns to its original position once the weight is removed.
A linearly colored or darkened translucent ribbon which forms the heart of the entire mechanism is connected to the inner end of the above movable shaft.
Also a white LED (used as a light source) and an LDR (light receiving component) are positioned exactly opposite, facing each other and partitioned by the ribbon.
An analogue moving coil type meter configured as an Ohm meter or a resistance meter is integrated with the LDR.
The LED is powered through a cell and is switched ON when in use. The light beam produced from the LED passes through the ribbon and falls over the LDR and a corresponding value is displayed over the meter depending upon the opacity of the ribbon.
When there’s no weight placed over the platform, the spring mechanism keeps the shaft in a position that produces the darkest shade from the ribbon in the path of the LED beam and therefore the meter also reads a minimum or zero value over its calibration.
The moment a weight on this weighing scale is placed, the shaft dips proportionately and the ribbon slides down to produce a linearly changing shade in front of the LED light beam and finally settles down to a corresponding lighter shade level. The operation is instantly translated over the meter to provide the equivalent value of the weight being measured.
Friday, April 5, 2013
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