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Server Demand to Slow in the Back Half of 2011

Published:2011/8/29 2:42:00 Author:Phyllis

According to the market research firm International Data Corp (IDC), the demand for servers remained high in the second quarter, but the situation is seem to change due to the global weakening macroeconomic conditions. The worldwide server market factory revenue in the second quarter reached $13.2 billion and increased 17.9 percent than the same period of 2010, marked the sixth consecutive quarter of year-o...   (View)

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Output Capacitance: an Important Part of Soft Switching Converter

Published:2011/8/29 1:29:00 Author:Phyllis

The output capacitance is an important part of soft switching converter design. In order to maximize power density, the power conversion switching frequency is being increasingly used. Soft switching techniques like zero voltage switching (ZVS) are frequently used to extend the frequency further. With the increase of switching frequen...   (View)

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Maxim Introduced an H-bridge transformer driver

Published:2011/8/28 22:35:00 Author:Phyllis

The MAX13256, an H-bridge transformer driver with a wide input-voltage range, is recently introduced by Maxim Integrated Products for isolated power supplies. This product makes sure that the efficient of isolated DC-DC converter could reach as high as 90 percent. It provides a simple soluti...   (View)

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The stake of Hynix will be held by Korean chaebol and Arab wealth fund

Published:2011/8/26 1:48:00 Author:Li xiao na

It is reported by the Wall street Journal, the Korea Chaebol may bid for 15% stake of the HYnix with Arab sovereign wealth fund. With this 15% stake, they are able to gain the management control of the memory company. The Chaebol, STX, is a large company that devotes to build ships. The European ship building interests, which was manag...   (View)

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Apple brings pressure to the rivals

Published:2011/8/24 21:41:00 Author:Li xiao na

According to the predication of HIS iSuppli, the 44.2m of ipad’s shipment will bring challenges to its rivals. The price of HP touchpad has been decreased from $500 to below $100 in seven weeks. What is more, it is restricted to Germany wide. All this has given a good opportunity for the iPad2 production. “All the momentum in the media tablet market is with Apple right now,” says IHS’ Rhoda Alexander, “the...   (View)

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Part 1: PCB design basics 4

Published:2011/8/24 2:25:00 Author:Amy

Karol Walraven Wrapping up Continue by placing the com­ponents in their final location (Figure 5). If you ore short of space, check if the following tricks are of any help: -Use SMD components. These are smaller (and therefore belter at higher frequencies) than leaded components and can b...   (View)

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Part 1: PCB design basics 3

Published:2011/8/24 2:19:00 Author:Amy

Karol Walraven Get cracking We’ll now gel lo work, keep­ing the above information in mind. A little bit of searching on the Internet will quickly pro­duce a number of free demo versions of nice printed circuit board layout software. At the end of the article we have included a few links lo get you started. When designing a PCB layout you start with the fixed con­straints. These a...   (View)

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Part 1: PCB design basics 2

Published:2011/8/24 2:14:00 Author:Amy

Karol Walraven C12 and C4 are capacitors in the signal path. In this case it is also true that short traces and small area provide less opportunity lo pick up trouble or cause trouble. We repeat the above once more because it is very important that you think about this. How does a signal connection have an area? In figure...   (View)

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Part 1: PCB design basics 1

Published:2011/8/24 2:07:00 Author:Amy

Karol Walraven What do most electronics engineers enjoy a lot? Designing printed circuit boards, of course! In an irregular series of articles we would like to familiarize you with this subject. We start as simple as possible and it will become more difficult as we progress. Feedback and requests to cover certain topics are encouraged and welcomed! When you’re just designing a sm...   (View)

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Class-2 Bluetooth RS-232 Adapter

Published:2011/8/24 1:56:00 Author:Phyllis

SMART Modular Technologies, Inc. announced its new Bluetooth 1.1 compliant RS-232 adapter for the industrial, medical, and scientific markets. This RS-232 adapter features an onboard antenna, an embedded configuration utility, and an embedded Bluetooth communications stack complete with the Bluetooth Serial Port Profile. When used in co...   (View)

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Temperature switches in SOT packages

Published:2011/8/24 1:17:00 Author:Phyllis

The MAX6509 and MAX6510 made by Maxim are very small temperature switches, which can be configured with a single external resistor to trip at any temperature between -40℃ and + 125℃. The accuracy of the trip point is typically ±0.5℃ and ±4.7℃ maximum. They have a pin that sets the hysteresis to either 2℃ or 10℃. The MAX6509 has an open...   (View)

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Butterfly Dipole for DVB-T: Simple and economical DIY indoor antennas 3

Published:2011/8/23 22:12:00 Author:Amy

Rolf Badenhausen Construction The whole butterfly dipole antenna assembly, including transformer and coupling capacitor, is only the thickness of a ballpoint pen. It can be con­structed on a single-sided piece of 1.5 mm thick epoxy resin printed cir­cuit board. The mounting ...   (View)

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Butterfly Dipole for DVB-T: Simple and economical DIY indoor antennas 2

Published:2011/8/23 21:59:00 Author:Amy

Rolf Badenhausen Butterfly dipole The real antenna impedance of a butterfly dipole is of the same order of magnitude as that of a hill-wave dipole. For such a full-wave dipole sys­tem a typical impedance would be between 240 Si and 300 Q, and in prac­tice probably nearer 300 SI than 24012. In any case, matching is required to the nominal 75 Q input impedance of the antenn...   (View)

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Butterfly Dipole for DVB-T: Simple and economical DIY indoor antennas 1

Published:2011/8/23 21:43:00 Author:Amy

Rolf Badenhausen Digital terrestrial television (DVB-T) is now available in many parts of the country. Of course, you need a DVB-T receiver and a (new) UHF TV antenna. If you don’t have a suitable antenna, the small indoor DIY alternative described here is a simple and economical solution. Terrestrial digi...   (View)

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VHF FM Antenna Booster: New horizons in 3-metre band DXing 3

Published:2011/8/23 2:32:00 Author:Amy

N. S. Hori Sankar VU3NSH Setting up Give the PCB a final, thorough inspection for bad soldering, wrong components, etc., and resolve all problems before proceeding. Set all presets and trimmers to the centre of their travel. Apply power to the amplifier and check the various test voltages indicated in the circuit diagram. These voltages are typical and should not be taken to mean the ’law’ ’...   (View)

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VHF FM Antenna Booster: New horizons in 3-metre band DXing 2

Published:2011/8/23 2:28:00 Author:Amy

N. S. Hori Sankar VU3NSH Construction The amplifier is built on the single-sided printed circuit board shown in Figure 2. The inductors in the design are all very simple to make, see the parts list for construction details. LI, 1.2 and L3, are wound on a 4.5-mm dia. drill or pencil. LI then needs to be stretched to a length of about 10 mm. You’ll find that a relatively large (View)

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VHF FM Antenna Booster: New horizons in 3-metre band DXing 1

Published:2011/8/23 2:17:00 Author:Amy

N. S. Hori Sankar VU3NSH Together with a good directional antenna this high performance two-stage antenna amplifier for the VHF FM broadcast band will enable you to capture far removed (DX) stations. Alternatively, it will drastically improve reception of FM signals you’ve come to accept as marginal and noisy in your area. FM broadcast(View)

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Part 1: PCB design basics (2)

Published:2011/8/23 1:58:00 Author:Li xiao na

By Karel Walraven Get cracking We’ll now gel lo work, keeping the above information in mind. A little bit of searching on the Internet will quickly produce a number of free demo versions of nice printed circuit board layout software. At the end of the article we have included a few links lo get you started. When designing a PCB layout you start with the fixed constra...   (View)

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Part 1: PCB design basics (1)

Published:2011/8/23 1:26:00 Author:Li xiao na

By Karel Walraven What do most electronics engineers enjoy a lot? Designing printed circuit boards, of course! In an irregular series of articles we would like to familiarize you with this subject. We start as simple as possible and it will become more difficult as we progress. Feedback and requests to cover certain topics are encouraged and welcomed! When you’re just designing ...   (View)

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RFID Detector for 13.56 MHz: Spot RFID tag transmitters from a distance 3

Published:2011/8/22 23:56:00 Author:Amy

Gert Baars Construction The receiver is built on the printed circuit board shown in Figure 3. The board is single-sided and no problems are expected in the construction department as only regular-size components are used at the ’top’ side and a few SMD caps at the solder side. Also, there are no inductors to wind! Figure(View)

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