Consumer Electronics

Introduction:

The daily use of electronic equipments are known as consumer electronics and includes TV, telephone, DVD, CD, PC, laptop etc. These equipments are manufactured throughout the world. With the advancement in electronic engineering at a continuous pace, a number of new variety electronics items flood into the market every year and the cost the existing products reduces continuously and it is one of the biggest advantage of consumer electronics industry.

Electronic waste is one of the problems associated with these electronic item and many manufacturers are now planning to deal with these waste.

Semiconductor:

All electronic devices use semiconductors and without these semiconductors none of the electronic device is complete. Semiconductor behaves like an insulator at absolute zero (-273 degree centigrade) and can be distinguished from conductor that at this temperature the outermost filled electron energy band is completely filled in a semiconductor compare to the conductor in which the band is partially filled.

At room temperature semiconductor show a very small electrical conductivity much lower than that of conductor.

Doping in semiconductor:

Most common semiconductors used for electronic devices are silicon and germanium. Although some other conductors such as iridium phosphide, gallium arsenide and mercury cadmium telluride are also used.

A pure semiconductor also known as intrinsic semiconductor, when doped with electron rich element e.g. arsenic or electron deficient element e.g. boron in very small quantity, its conductivity increases and the resultant conductor is known as extrinsic conductor. My doping arsenic (electron rich) and boron (electron deficient) in silicon, we get n-type (negative type) and p-type (positive type) semiconductor devices.

We may create a p-n junction by doping different element in different region of semiconductor and the device is known as diode. Similarly we can create p-n-p or n-p-n junctions and the device is known as triodes.

Electronic Devices

(a)Television: It is a device by which we can receive moving pictures and sounds over a distance. The whole transmission and receiver systems require the following inputs. 1.Camera for live images or flying spot scanner for transmission of films and sound source.

2.Transmitters for transmitting both images and sounds.

3.Receiver systems for receiving these signals.

4.Display device, which is either CRT, Rear projection, LCD or plasma. To display the signal in the forms of images and sounds.

(b)Telephone:

It is the device for communicating by which two persons can send and receive sound signals over a distance. The system requires the following inputs.

1.The telephone equipment, which converts sound signals to electrical signals and electrical signals to sound signals.

2.Central exchange from where the subscribers are interconnected.

Guidelines for Disposing of Computer And Household Electronics

Many of us are veterans of recycling programs where we can sort our own recyclables into the right recycling bins to the praise of all of our neighbors. You may live in communities that offer a single stream program that doesnt require sorting. Regardless of which type of program is in effect in your town, some types of household items cannot be put out with other trash or recyclables — in particular, household electronics. Computers and stereo equipment require some special attention to when you’re ready to dispose of them.

Dont Put Electronics In Your Recycling Bins

Electronic home goods cannot be placed with regular trash or recyclables. Most of these goods contain heavy metals that are not allowed in landfills. Those old CRT monitors from computers and old TVs actually contain lead and mercury. They are perfectly safe to use, but when they break down in a landfill, those metals break down and infiltrate the water system. Even modern electronic appliances such as cell phones all have dangerous substances in them. To avoid causing harm to the environment and a potential fine, electronics need to stay out of your recycling bins and garbage cans.

Keep any type of electronics trash in a separate container or area where it will not get mixed in with other waste. Designate this area for all types of special materials that cannot go in the trash like empty containers of paints or chemicals, car or lawn mower batteries, fluorescent light bulbs, or any other hazardous material. Each type of waste will require special methods to properly dispose of.

Never Put Electronics Out For Your Waste Collectors

It might be tempting to put this type of waste into your regular recycling bins and let the waste collectors deal with it. However, waste collectors will not pick up any container if they see electronics or any other dangerous waste. In fact, some towns will levy fines against you if you even try this. There are alternatives to trying to sneak in some off-limits trash and hope the collectors don’t notice — there are a number of convenient ways to properly dispose of unwanted electric appliances and goods.

Your Local Recycling Center

Your towns waste management center should be capable of handling any residential waste you can bring them. They will have designated recycling bins for electronics or at least a separate area where they can be properly disposed of on site. There are also private companies that specialize in handling consumer electronics and they typically do not charge any fees.

Reuse Instead Of Recycle

Many times, we are getting rid of old equipment because we upgraded to the latest model. Any electronics that still work are worthwhile to reuse rather than dispose. Even broken equipment can be salvaged for spare parts, especially since manufacturers rarely sell parts. Try offering electronic waste for the cost of pickup and removal and someone will surely come by and take your old goods; post a note on a local message board or social network website. Consider donating to charity for a good feeling and a tax break.