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Power cables are a pain: ugly, inconvenient, always in a tangle, something to trip over and there are never enough sockets to plug them into. So imagine how convenient it would be if power cables could be replaced by beamed power. This is not a dream; in fact a world without power cables might be just around the corner.

For many years engineers have sought to replace power cables with beamed energy, though until recently the complications have been too difficult to crack; now recent breakthroughs have put these objectives back on track. Currently this is receiving some real backing from the likes of Intel and Sony, already there are televisions, mobile phones and laptops computers that can be powered without wires.

Wireless power transmission is not new. In 1901 Tesla Tower was erected to do precisely that however the project was halted due to lack of sufficient funds. That was the end of the notion until, in the 1960s, it was shown that model aircraft could be powered by beaming microwaves at them.

In the modern era, the reason for the resurgence of interest in power without cables is that data communications implemented using Bluetooth and WiFi have highlighted how convenient it would be if the power cables could also be replaced by wireless.

Currently there are three ways to transmit power wirelessly. These are using radio waves, using lasers, and using magnetic induction. We will look at all three of them.

Radio Waves: This technology builds on the same kind of technologies used in Bluetooth and WiFi to transmit power. One company has already demonstrated that this technology is capable of transmitting milliwatts of power over distances of 15 meters. They are now working on versions of this that can be used for recharging portable devices such as mobile phones and laptops.

Lasers: Here infra red laser beams are beamed at photocells that convert the light into electrical energy. This has been used to power such items as loud speakers and lamps. At present the system is not very efficient, but work is underway to improve the current efficiency of around 15% to around 50% which would make it suitable for powering such items as laptops.

There is very little falloff of laser power over distance, so considerable distances could separate the laser from what it was charging. Special devices could be used to cause the beam to track the device when it was moved and thus keep the beam focussed, though line of sight must be maintained.

Magnetic Induction: Whilst the first two technologies are suitable for devices that use low amounts of power, magnetic induction can be used to transmit large amounts of power. This technology creates a magnetic field by passing a current through a coil. This magnetic field then induces a current in another coil placed in it. Although low power versions of this are commonplace (for instance electric shavers) the energy source and device have to be very close together as the efficiency reduces quickly with distance, though this can be improved by using tuned circuits, a technique known as resonant transfer. Using this it is possible to power a television half a meter away from the power source with a loss of only 30% of the transmitted energy. Sony has already demonstrated an entirely wireless powered television and Intel is also applying the technology to various consumer items.

Last Word

There remain a number of challenges before this technology becomes commonplace, including a number of health and safety issues. The implications of high power energy beams are not fully understood and it is possible that there are long term effects of being exposed to high energy magnetic fields; certainly there are potential dangers for people fitted with pacemakers.

With so much emphasis on improving the efficiencies of electrical and electronic equipment, a technology that reduces efficiency would be likely to meet serious objections. However, these technologies are still under development and it is probable that the challenges will be met and the concerns diffused.

Perhaps, before too long, we will be able to get rid of those tangled cables altogether.

Gary Shorthouse is a freelance technical writer with a keen interest in modern technology and science. For more information on the latest innovations in Bluetooth and other Wireless Technologies and Devices he recommends that you visit his website UKBluetooth at http://www.ukbluetooth.co.uk.

Low Price for Sony SSB1000

Low Price for Sony SSB1000

Sony SSB1000
Save on Sony SSB1000. Fast & transport fiables, Commander dès maintenant!

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Customer Review:

Basics: $ 50 for a couple of good sounding speakers. Even after reading the messages, I am with them, how they play, if surprised to be with my regular speakers compared to $ 600! You may want to get a subwoofer for music and movies with the range, but even then makes a good budget subwoofer perhaps $ 100-150, and these are still very Sony. 

Yes, you can spend much more to sound a bit "better, but for someone on a budget, an average budget, these are definitely the way forward. For $ 150 you can in June of this as the primary basis for a theater system home to obtain. 

The [only 5 Speakers equivalent] comes to mind is energy, Take 5, which also sound good and are very modest price, but you have five speakers at once. Regardless of these Sony's are a wonderful bargain, great.

 

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BuyingSony SS-B1000 5 1/8-Inch Bookshelf Speakers (Pair)

great speakers

I wanted to get the digital sound from my cable box music stations into my bedroom so I bought this amplifier, a pair of SONY SS-B1000 5 1/8-Inch Bookshelf Speakers, and a 20' RCA cord (red/white). 

Sounds great and all for under $100. 

The amp is barely cranked, and I mean barely, but I have more than enough sound. 

The SONY's sound great and for the price represent a real value.
CheapSony SS-B1000 5 1/8-Inch Bookshelf Speakers (Pair)

Maybe this will help

It is probably pointless to add yet another review to this speaker that says "good for the price". Everybody knows that by now. What I have noticed is the few reviews that say the sound is muddy or there is no midrange or highs. (I will discount the complaints about "needing an amplifier") 

I will start by mentioning something I have seen in no other review: When I opened the box, there was a notice from Sony taped to the top of the wrappers on the speakers. A warning, actually. It said to be sure to connect the speakers to an amplifier "near" the maximum rating of the speaker. It went on to say that failure to connect them to a "sufficiently powerful" amplifier would result in tweeter burnout. 

So, the question is: What is "sufficiently powerful"? 

I will spare you the boring details of my research, and give you the bottom line. Do not connect these to an amplifier of less than 40 Watts RMS per channel. At 40 Watts and up, you are pretty much safe no matter how much you crank it. Below that, you risk clipping the waveform going to the tweeter. The clipping will distort the sound and apply what amounts to a straight DC voltage to the tweeter voice coil. This voltage heats the wiring until it melts the lacquer coating on the wire and shorts out the tweeter. (maybe more than you needed to know) 

The tweeters use a large amount of the power in, and handle the upper midrange as well as the highs. Severe clipping and/or burnout would result in weakened midrange, no highs, muddy sound. 

Not exactly a review, I guess, but maybe it will help some buyers decide whether they want to try these or not. 

If you are curious, I have these hooked to an amplifier putting out 105 Watts per channel. Plenty of reserve power, achingly clear and bright highs. Bass is barely adequate, but OK for most stuff I play. You can always mess with tone controls, but turning up the bass doesn't boost the bass so much as richen the lower midrange which is carried by the woofer. Voices are quite clear. I could use better speakers, but these will do until I get around to upgrading. It could be a while.

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How many watts are in an NT 12 Orion Subwoofer?

I have two Orion 12" NT Carbon fiber dual voice coil subwoofers. They are NT not NT2 with the red and yellow logo on them.
I can't find the watts on it. Does anyone know roughly how many watts? Are they good subs?

absolutely zero watts, the amp provides the power to the subwoofer, you have as many watts as your amp puts out at the given impedence. basically when you see a speaker and its says "300 wattsmax power!" thats to get people who dont know any better, than basically means 150Watts rms power handling. all the numbers of watts you see on the speakers specs is power handling.

Hyundai Revolutionizes the Coupe with the All-New Veloster at The Detroit International Auto Show
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