2011
Electronics

The emergence of 24bit recordings has further increased the accuracy of audio material, lowering the THD+N (total harmonic distortion plus noise) at more than -120dB below the audio signal. For transparent sound reproduction, designers are challenged to reduce the THD+N of existing power amplifiers 10 to 50 times to meet the new THD+N milestone.

We illustrate a class AB power amplifier (UFI), which according to SPICE simulations may reach a THD+N of -130dB (0.00005% THD+N) at 20kHz into a 4ohm load when configured with a gain of 20. Measurements on a prototype show that the performance depends on the circuit board’s layout and choice of electronic components.

Here are some key design aspects of UFI:

1) Simple, compact and ...

It is estimated that nearly 2 billion people are using the Internet. Recent studies have shown that news and information are just as important to many of these users as entertainment or shopping.

Search engines are the only workable way to find information on the internet when the user doesn't already know what URL(s) to use. But the standard search engine interface consists of a single line for entry of key words, and commonly returns thousands of suggested links. For serious researchers, students, workers and citizens trying to become better-informed, this search paradigm wastes time. They need a way to narrow down their searches quickly without learning how to use logical operators, special characters, etc.

This suggests the need ...

We use a pen drive to transfer data from one system to other system. My idea is if the data is in one USB and if we want to transfer it to another USB there is no need to transfer it to your personal computer. Instead the USB drive has an option of a slot on its other end to insert another pen drive to it. The pen drive which is charged through computer detects any USB connected to it. it reads the data and transfers the data to the USB by operating of the switch on button. The data is transfered by creating a new folder in the other USB.

My second idea is a USB with blue tooth connectivity. ...

The human voice has the ability to control or operate an alarm, a radio or a variety of other devices including toys. Keeping this in view an idea was conceived to develop a device that can understand the human voice and perform the desired operations. This device when developed can help the blind community a lot in performing their day to day activities with ease and comfort. With addition of Speech (voice response) functionality the same device can be used to understand few real time situations and act accordingly. This can also be adopted by the personnel who cannot use their hands.

The basic principle involved is that a Microphone receives the sound waves of certain amplitude that produce ...

WhalePower is in the process of developing a range of new, more efficient fans for computer cooling. Our corporation holds the patent to develop new fans, turbines, pumps and compressors improved by a unique blade shape, enhanced by bumps on the leading edges of the rotor blades called "tubercles." This innovation was discovered by WhalePower’s President, Dr. Frank Fish, who discovered that the bumps on the leading edges of humpback whale flippers or “Tubercles” changed the flow of fluid across these immense natural wings. When applied to turbine and fan blades, these Tubercles increase lift, reduce drag, eliminate stall and operate virtually silently. In short they make a better airfoil that can improve a host of products from turbines ...

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