12V Switching Regulator Boosts Input Voltage
Posted by News
In conventional applications, switching-regulator ICs regulate VOUT by controlling the current through an external inductor. The IC in Figure 1, however, driving a diode-capacitor network in place of the inductor, offers comparable performance for small loads. Made of readily available components, the network can double, tripple or quadruple the input voltage. Though somewhat less efficient than inductor-type regulators, the Figure 1 circuit offers equivalent line and load regulation.
Read More Source:
http://www.maxim-ic.com/appnotes.cfm/appnote_number/5/ln/en
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Micropower Linear Voltage Regulators
Posted by News
The ADM663A/ADM666A contains a micropower bandgap reference voltage source; an error amplifier, A1; three comparators, C1, C2, C3, and a series pass output transistor. A P-channel FET and an NPN transistor are used on the ADM663A while the ADM666A uses an NPN output transistor.
Source:
http://www.analog.com/UploadedFiles/
Application_Notes/66728469AN-392.pdf
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Steps Towards Warship Invisibility
Posted by Lockergnome
Naval warships might look like all-powerful vessels but they are also highly vulnerable to being spotted by the enemy. That fear of being detected has led the military to develop new stealth technologies that allow ships to be virtually invisible to the human eye, to dodge roaming radars, put heat-seeking missiles off the scent, disguise their own sound vibrations and even reduce the way they distort the Earth’s magnetic field, as senior lecture in remote sensing and sensors technology at Britannia Royal Navy College, Chris Lavers, explains in March’s Physics World.
Wars throughout the twentieth century prompted advances in stealth technologies. Some of the earliest but most significant strides towards invisibility involved covering ships with flamboyant cubist patterns - a technique known as “dazzle painting”. During the Second World War, the US military even worked out a way of using lights to make the brightness of a ship match that of the background sea.
When British physicist Robert Watson Watt was charged with designing a ‘death ray’ to destroy entire towns and cities during the Second World War, he calculated it impossible. He did conclude however that radio waves could be used to detect ships and aircrafts too far way to be seen by the naked eye.
Radar was born. For ships to dodge radar, both a ship’s geometry and a ship’s coating have to be considered. Radars are particularly receptive to right angles, which is why modern battleships are often peculiarly shaped. Special paint and foam-coating have also been used to cover ships, which convert radio-waves into heat and stop radio waves being reflected, rendering the signals useless.
The “stealthiest” ship that currently exists is Sweden’s Visby Corvette. Apart from being painted in grey dazzle camouflage and made of low-radar reflectivity materials, it also does not use propellers, which are the noisiest part of a ship. The vessel also has the lowest “magnetic signature” of any current warship.
But the next generation of warships could be truly invisible by exploiting “metamaterials” - artificially engineered structures first dreamt up by physicist John Pendry at Imperial College, London. Metamaterials are tailored to have specific electromagnetic properties not found in nature. In particular, they can bend light around an object, making it appear to an observer as though the waves have passed through empty space.
About the research, Chris Lavers writes, “If optical and radar metamaterials could be developed, they might provide a way to make a ship invisible to both human observers and radar systems, although the challenges of building a cloak big enough to hide an entire ship are huge.”
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Last day for contest
Posted by Geeksinside.com - Code, Circuits, Projects
Original post
Contest Rules
Comment counts: http://geeksinside.com/comments.php
And for your viewing pleasure, your geek humor for the day: http://www.mnispi.org/cartoon/2002/pages/Computer%20Engineer_gif.htmNo tag for this post.
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ESRC Festival Of Social Science 2008
Posted by Lockergnome
Social science plays an important part in all our lives. It shows that science is not just test tubes and technology but involves people and society too. It helps us to make sense of the key issues in the changing world around us such as the implications of climate change, nuclear power or nanotechnology; or the implications of social issues such as ageing , immigration and population change.
Running from Friday 7th March to Sunday 16th March, the ESRC Festival of Social Science, organised by the Economic and Social Research Council (ESRC), will celebrate some of the very best British social science research, highlighting the ways in which it makes a difference to all our lives.
More than 30 UK towns and cities, from Aberdeen to Bognor Regis and Belfast to Cardiff, are hosting events during the Festival. Over 90 events are being organised during the Festival ranging from conferences to workshops and debates, exhibitions, film screenings, policy briefings and much more. Plus if you can’t make it, there are even virtual events with one taking place in Second Life.
Whether it’s school children tramping through the Peak District on a ‘Moorland Walk’ or getting to grips with why economy is important; finding out how you could save money on your energy bills or exploring the impact of Alzheimer’s, this Festival has something to capture everyone’s interest.
Broadly speaking, social scientists study society, how we behave and our impact on the world around us.
Professor Ian Diamond, Chief Executive of the Economic and Social Research Council points out that: “We fund world class social scientists to deliver the highest quality research on the most pressing economic and social issues that we face. Some of our researchers are tackling problems close to home such as poverty, health, education and crime. Others are addressing key conundrums on the global stage - intractable issues such as the environment, terrorism, sustainability and the world’s poor. But, whether close to home or further afield, our aim is to fund research that makes a tangible difference to people’s lives.”
The events during the Festival will touch on many issues affecting Britain today such as:
- Global uncertainties - assessing the impact of global challenges such as security, poverty, and environmental degradation
- Street fictions and realities: childhood experiences on film
- Learning with your children
- Does the UK need nuclear power”
- Food for the future - is organic enough”
- It’s my future: being deaf in 2018
- Imagine this: living with dementia
- Choosing the best energy deal for you
- Siblings: the significance of brothers and sisters
- Building a better partner: public services and social enterprise
- The future of low wage work in Europe
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