TREE

This is a circuit of SA58672 Small Class-D Audio Amplifier. This circuit is suitable for mobile device. It has maximum output power of 3.0 W for a 4ohm load and 1.7W for 8ohm load with power supply of 5V. If we uses 3.6 V power supply, the maximum output power is 900mW with 8ohm load. Here is the circuit : Using 9-bump Wafer Level Chip Scale Package (WLCSP), the SA58672UK save space in portable designs, because it measures only 1.66 x 1.71 x 0.6 mm. This circuit produces better overall audio performance because it has improved RF rectification and immunity to noise. The SA58672UK is suitable for cellular handsets or wireless and other portable audio application because it has fast start-up time of 7 ms eliminates pop-on sounds. [Source: NXP Application Note]

Researchers at MIT have designed a novel device the size of a U.S. quarter that harvests energy from low-frequency vibrations, such as those that might be felt along a pipeline or bridge. The tiny energy harvester — known technically as a microelectromechanical system, or MEMS — picks up a wider range of vibrations than current designs, and is able to generate 100 times the power of devices of similar size. To harvest electricity from environmental vibrations, researchers have typically looked to piezoelectric materials, or PZT, such as quartz and other crystals. Various designs are based on a small microchip with layers of PZT glued to the top of a tiny cantilever beam. As the chip is exposed to vibrations, the beam moves up and down like a wobbly diving board, bending and stressing the PZT layers. The stressed material builds up an electric charge, which can be picked up by arrays of tiny electrodes. However, the beam itself has a resonant frequency and outside of this frequency, the...

Nokia is preparing for the possibility of some additional products for Microsoft than Windows Smartphone Phone 7. One such product is a dual-screen device that can display 3D images, while the other is a tablet Windows 8. Both these gadgets have not confirmed its existence by Nokia's device with dual screen is visible from a patent application by Nokia on April 21, then under the name "Autostereoscopic Rendering and Display Apparatus" or a display device and processing autostereoskopik. According to those files, this device consists of a sensor arranged to detect the position and orientation of one's view of the auto-stereoscopic display. There is also a processor that is configured to determine the surface of an object that can be seen in 3D user, and an image generator arranged to create an image received by the right eye and left a visible 3D auto-stereoscopic. From the pictures included in the patent is expected to have a 3D image processing screens and other scr...