IC Blog Center
Index 62
Virtual Soldering （3）
Published:2011/8/2 2:59:00 Author:Amy
By Dr. Thomas Scherer What can LabVIEW do? LabVIEW has practically everything one would expect from a normal programming language: all the usual variable types from bits through double-precision floating-point to arrays and compound types. Even complex numbers are available. It can in some cases calculate directly with physical units. The usual constants from e to the gas ... (View)
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Virtual Soldering （2）
Published:2011/8/2 2:39:00 Author:Amy
Dr. Thomas Scherer What is LabVIEW? The first version of LabVIEW (1.0) appeared in 1986, initially only for the Apple Macintosh computer. At that point the Mac itself was already two years old and represented a revolution in user-friendliness in the history of personal computing. Text-based entry was replaced by graphical metaphors, including a desktop with windows, waste ... (View)
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Virtual Soldering （1）
Published:2011/8/2 2:23:00 Author:Amy
Dr. Thomas Scherer Even experienced electronics engineers occasionally find themselves confronted by the need to swap soldering iron for keyboard: not all projects can be realized purely in hardware. LabVIEW makes an excellent choice of programming language for engineers! When a PC forms an integral part of a technical solution and no suitable software is available off the shelf, so... (View)
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浅谈B2B的发展趋势
Published:2011/8/2 2:14:00 Author:Celina
B2B现在的市场发展势头很猛，据统计国内现在运营的B2B网站（包括公司和个人）已经达到一万多家。据电子商务行业相关数据显示，2010年中国电子商务交易规模达4.8万亿元，较2009年增长33.5%。其中阿里巴巴以绝对的优势占领B2B的龙头位置，但是近几年也陆续有一些新的网站取得迅猛发展，譬如中国化工网，我的钢铁网等，成为B2B行业不可忽视的力量。那么B2B未来的路将怎么走呢，本文做出以下几点推测。 首先，B2B电子商务平台将从信息平台逐渐向服务平台转变。目前国内B2B电子商务平台主要还是以信息服务为主，通过信息发布和产品配对，以帮助企业寻找和获取商机。但是B2B许多先天性交易优势，比如在线价格协商和在线协作等还没有充分发挥出来。现在很多B2B网站的在线交易都需要网下的沟通配合，才能完善整个交易过程。所以B2B电子商务平台必须加强平台服务的功能，由信息发布向交易服务转变。同时，B2B网站要发展配... (View)
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Gameboy Oscilloscope （6）
Published:2011/8/2 1:47:00 Author:Amy
Conclusion We don’t want to claim that choosing an oscilloscope is an easy task, even with this survey to help you. As already mentioned, it’s a good idea (or even essential) to base your choice on your specific measurement tasks, taking future wishes into account as v/ell. This survey and the reported results should then help you to more quickly sort through the available options. ... (View)
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The Grantsdale chipset PCB Design Kit
Published:2011/8/2 1:46:00 Author:Phyllis
The Grantsdale referred to chipset made by Mentor Graphics Corporation for providing Intel Corporation with drop-in core layout (DCL) kits with the Mentor Graphics® Expedition™ PCB design flow. This DCL kit was a follow-on to the Intel 915G/P and 925XE Express Chipset kits integrated the CPU, chipset and other motherboard components for use with the Expedition PCB design flow made personal computer mother... (View)
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Gameboy Oscilloscope （5）
Published:2011/8/2 1:43:00 Author:Amy
Recommendations To start with, it is important to determine how much bandwidth and how many channels you need for the measurements you will be making - both now and in the future. After all, an oscilloscope’s bandwidth and number of channels cannot be upgraded later on. The next thing to consider is that an oscilloscope cannot be ’interfaced’ to the object to be measured without t... (View)
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Gameboy Oscilloscope （4）
Published:2011/8/2 1:19:00 Author:Amy
Digital storage oscilloscopes The Wittig 22-300, the simplest instrument in the ’pure digital’ category, is limited with regard to more than just its bandwidth and sampling rate. Its operation, measurement capabilities and display fall short of qualifying it for serious use. This is offset by its modest price. However, you would be wise to consider purchasing a good analogue inst... (View)
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THAT＇S CLASS: Audio Amplifiers from A to T （3）
Published:2011/8/2 1:13:00 Author:Li xiao na
By Harry Baggen Classes 5 and T Although the working principle of the Class D amplifier is already several decades old. it never managed to become truly established in hi-fi applications. This was primarily due to excessive distortion and a lack of good semiconductor devices (fast power FETs). In the meantime, several manufacturers have devised variations on thi... (View)
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THAT＇S CLASS: Audio Amplifiers from A to T （2）
Published:2011/8/2 0:56:00 Author:Li xiao na
By Harry Baggen Class A Here we begin with the simplest configuration, the Class A final amplifier, which is also one of the best configurations for high-quality audio reproduction. In its basic form, this configuration can be implemented using a standard emitter follower (Figure 1). The quiescent current through the transistor is equal to the peak ... (View)
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THAT＇S CLASS: Audio Amplifiers from A to T （1）
Published:2011/8/2 0:40:00 Author:Li xiao na
By Harry Baggen The final amplifier is the power source of every audio installation. Its job is to convert a small alternating voltage into a powerful signal suitable for driving loudspeakers, with as little distortion as possible. During the years since the invention of electronic audio systems, designers have come up with various approaches to this problem. It all started with Class A... <... (View)
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Multi Programmer: One Size Fits All （5）
Published:2011/8/1 22:54:00 Author:Li xiao na
By Andreas Oyrer Programming routines The data received is decoded by the routine Decode Programmer Data Q in the file Prog.c. The first byte of the 64-byte report contains the code for the selected microcontroller, while the second gives the desired action. These values are used to call one of a number of different programming algorithms for different devices, as given in the micro... (View)
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Multi Programmer: One Size Fits All （4）
Published:2011/8/1 22:35:00 Author:Li xiao na
By Andreas Oyrer Protocol A protocol is of course required to ensure that data communications between the PC and the programmer are kept in step. The first byte from the PC to the programmer contains information on the selected microcontroller or memory: the value 1 specifies the 9Cx051 series, the value 2 the 89C5x and 89Sx series. The second byte gives the selected action: 1 to re... (View)
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Multi Programmer: One Size Fits All（3）
Published:2011/8/1 22:17:00 Author:Li xiao na
By Andreas Oyrer PC software The software running on the PC is written in Delphi 7. The menu language can be set (under Setup, as shown in Figure 2) to English, French or German. This setting, along with all other settings, is stored in the registry and automatically recalled when the program is next run. <... (View)
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Swiss Army knife （6）
Published:2011/8/1 21:38:00 Author:Phyllis
By Jim Spence Assembly code At some point in time more control or faster speed may be required than a high level language can give. There is no alternative but to resort to use assembler, which is the direct equivalent to programming the processor itself. To do this effectively you will need an ... (View)
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Swiss Army knife （5）
Published:2011/8/1 21:30:00 Author:Phyllis
By Jim Spence ByVac-Terminal ByVac-Terminal does have some built-in features to get maximum performance and ease of use from the Swiss Army Knife. Version 1.0 is free from the Free Downloads section of our website: www.elektor-electronics.co.uk. As an example, to download a program from your text editor you can simply use ’Send File’. If however you are using the EEPROM (View)
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Swiss Army knife （4）
Published:2011/8/1 21:21:00 Author:Phyllis
By Jim Spence Memory The memory space of the 8052 uses an architecture that shares parallel areas of memory. By logically combining the OE and PSEN signals to access the RAM it means that the external RAM can be used as program memory. The 8051 architecture is old and we’re sure that separating out the data and program memory seemed like a good idea at the time. This is what is know... (View)
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Swiss Army knife （3）
Published:2011/8/1 21:15:00 Author:Phyllis
By Jim Spence ...and USB As you can see from the PCB artwork, the USB interface is connected to the MCU section by copper tracks. If you want to fit the USB interface at some distance from the MCU board, the PCB sections have to be separated by cutting or sawing and a small connection cable installed between the respective connectors. Now for some bad news. The FT232BM chip ... (View)
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Swiss Army knife （2）
Published:2011/8/1 21:13:00 Author:Phyllis
By Jim Spence USB interface The USB interface shown in Figure 2 uses a chip from Future Technology Devices Intl. Ltd. (FTDI) and the circuit follows their data sheet. The FT232BM is designed as a quasi-replacement RS232 interface and when installing the device drivers, it becomes a COM po... (View)
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Swiss Army knife （1）
Published:2011/8/1 21:03:00 Author:Phyllis
By Jim Spence In a fix? Need to get a microcontroller project off the ground FAST? This article proves that an ultra-versatile microcontroller board can be built and programmed even by relative newcomers. The main circuit is based on the Atmel 89C8252 which has an 8052 architecture. Knife Tiny BASIC, 8051 assembler, RS232 and USB all in one project Included is some v... (View)
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