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Digital Alarm Clock-- Based on a PIC micro （3）

Published:2011/7/22 1:46:00 Author:Li xiao na

by M. Conde de Almeida Control software The entire clock program was written in the PIC Assembly Language using the MPLAB Integrated Development Environment (v. 5.70.40) supplied free of charge by Microchip. The source code and Hex files containing the program ready to be flashed into the PIC microcontroller can be obtained free of charge from the Publisher’s website, see t...   (View)

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Digital Alarm Clock-- Based on a PIC micro （2）

Published:2011/7/22 1:17:00 Author:Li xiao na

by M. Conde de Almeida The hardware Figure 1 shows the complete circuit diagram of the clock. All intelligence (and a lot of logic) is vested in the PIC16F84 MCU in position IC5. Using RA0-RA4 and RB5-RB7 as input port lines and RB0-RB4 as output port lines, a fair amount of executable code run from the on-chip memory is able to take total control of the circuit, requiring just a 5-...   (View)

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Digital Alarm Clock——Based on a PIC micro （1）

Published:2011/7/22 0:55:00 Author:Li xiao na

by M. Conde de Almeida Although digital alarm clocks have been around for years, most of today’s off the shelf products suffer from serious design limitations. For example, many don’t keep track of weekdays and can only store one alarm time. High time for a home-brew design that does a better job. Off the shelf alarm clo...   (View)

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The New Device Of GPRS1/GSM2

Published:2011/7/21 3:53:00 Author:Li xiao na

The new brand of AMC1802GSXLA’ dual band GPRS1/GSM2 has been released by Alpha Micro Components (wvAv.alphamicro.net), which has the radio modem inside. This new product is developed with RIM’s superior radio modem, which is become ideal to transmit the data to and from wireless mobile electronic devices. These devices include point-of-scale terminals and ...   (View)

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Thunderbolt was put in display, Macs

Published:2011/7/21 2:25:00 Author:Amy

One day after Apple announced record financial results, it released a 27-inch display for the Thunderbolt interconnect which is an updated versions of its MacBook Air notebook and Mac mini desktop with Thunderbolt and an upgrade of its Mac OS operating system. The Apple Thunderbolt Display is the first display and one of the first major peripherals to ship, which uses Thunderbolt, a dual 10 Gbit/s bi-direct...   (View)

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The Rising Problem of Counterfeit Components

Published:2011/7/21 1:59:00 Author:Phyllis

According to a survey published by the US Department of Commercial and commissioned by the US Naval Air Systems Commands, more than 50 percent of surveyed electronics distributors had encountered counterfeit components. Among them, 10 percent of the companies were franchised. The survey questioned companies from five segments in the supply chain. They are the component manufacturers, distributors, pcb a...   (View)

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Hands-on CPLDs -Part I: Experimental rev counter （5）

Published:2011/7/21 1:14:00 Author:Li xiao na

By A. Rosenkranzer The PCB and future developments A double-sided PCB has been produced specifically for this tachometer project. The PCB and component placement diagram is shown in Figure 3. Component mounting should be fairly straightforward but take care not to allow any solder debris to enter underneath the PLCC socket where it could short between PCB tracks. Correct orientation of the IC is i...   (View)

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Hands-on CPLDs -Part I: Experimental rev counter （4）

Published:2011/7/20 22:46:00 Author:Li xiao na

By A. Rosenkranzer The remainder Power for the circuit is supplied by the 12 V vehicle battery via connector Kl. Diode Dl prevents damage to the circuit if the supply polarity gets mixed up. LI filters noise spikes on the supply to the 5 V regulator IC2 while CI and C2 are also used to provide noise decoupling. The complete circuit takes about 0.5 A worst case so power dissipation i...   (View)

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Hands-on CPLDs -Part I: Experimental rev counter (3)

Published:2011/7/20 22:10:00 Author:Li xiao na

By A. Rosenkranzer The peripheral circuitry Figure 2 shows the detail circuit diagram of the tachometer. IC1 is the CPLD type EPM7128S from Altera packaged in a 84-pin PLCC outline. The chip has a total of eight ground pins that must all be connected to GND. There are also two types of VCC connection on the...   (View)

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Hands-on CPLDs -Part I: Experimental rev counter (2)

Published:2011/7/20 21:44:00 Author:Li xiao na

By A. Rosenkranzer Hands-on This article and its follow-up does not concentrate too heavily on a theoretical textbook approach to the use of CPLDs in digital designs instead we use a practical hands-on method. Here we build a digital rev counter (tachometer) suitable for use in most cars or motorbikes. The rev counter design is quite straightforward and should make a good introduction ...   (View)

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Fairchild’s Latest Headphone Amplifier Balance Audio Power and Battery Life

Published:2011/7/20 6:17:00 Author:Amy

For smart phones, tablet PC / Multimedia Internet Device (MID) and portable media players and other mobile products, designers are faced with challenge to make small speakers provide louder and clearer audio, and meantime, minimize the impact on battery life. Therefore, the world’s leading high-performance and portable power supplier Fairchild Corporation (Fairchild Semiconductor) has developed step-...   (View)

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How to Avoid Counterfeiting Electronics Trades

Published:2011/7/20 2:49:00 Author:Phyllis

Most of the world’s electronics that supplied to companies are perfectly above board. However, the number of counterfeit electronics trade are also significant. According to the United Kingdom association, the counterfeit goods could cost 30 billion pounds every year. And the problem is getting worse. China is a problem area as 95% of potential counterfeit products are made there. Recently, the US expr...   (View)

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Hands-on CPLDs -Part I: Experimental rev counter (1)

Published:2011/7/20 1:44:00 Author:Li xiao na

By A. Rosenkranzer In the past Complex Programmable Logic Devices (CPLDs) have been something of a closed book to most semi-professional electronics enthusiasts but this hands-on series should go some way to help dispel that myth. Times change. It wasn’t long ago that programmable logic devices (PLDs) were thought to be the prese...   (View)

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The TIC of Birmingham to host international Micro-Robotics Competition

Published:2011/7/20 1:06:00 Author:Li xiao na

The Event Administrator, Rita Kerry The micro-robotics competition known as MICROMOUSE 2004 is to be hosted by the Technology Innovation Centre (TIC) at Birmingham’s prestigious Millennium Point on Saturday, 19th of June 2004. (View)

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Holtek Rolls Out USB Speaker MCU HT82A824R

Published:2011/7/19 3:33:00 Author:Amy

Holtek Semiconductor has announced HT82A824R USB Speaker OTP MCU which integrates USB 2.0 Full Speed Compatible SIE and high performance D/A convertor and amplifier complying Microsoft WHQL requirement. Meantime, it combines with microcontroller to offer convenient design and manufacturing platform for users. Due to build-in hardware UART and rich hardware resources, HT82A824R can be applied in wide appli...   (View)

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Description Of The LED Protective Element

Published:2011/7/19 2:48:00 Author:Li xiao na

The LEDs are always designed to be in series to implement the high power LED illumination application. This application can not be taken by single LED because of the heat-dissipation problem. However, the series-connected construction has its shortcoming: when one LED is broken, the whole light can not work. In order to solve this problem, many suppliers have released the LED protective elements with different size...   (View)

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ADI Announced Diff-Amp ADL5565 for High-Speed Convertor

Published:2011/7/19 1:36:00 Author:Amy

Recently, Analog Devices, Inc., a global leading supplier for High-performance signal processing solutions and RF IC, has released a new differential RF/IF amplifier ADL5565 for high-speed 12-18 bit A/D convertor. The new amplifier has -3dB bandwidth at 5 GHz, and achieves extremely low distortion, noise and IP3/IP2 performance. ADL5565 amplifier features optimal wide bandwidth, low distortion and low noise. The di...   (View)

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Electricity Of The Car Becomes The Developing Direction

Published:2011/7/18 3:12:00 Author:Li xiao na

Currently, the new techniques, such as iPhone and mobile internet, have been fashionable all over the world. The techniques have totally changed people’s life; meanwhile, they also have changed the function of automobile. The automobile is never a winglet, and it has the multifunction of transportation, entertainment, office and communication. Young people will be the main consumers in the future, and they have the...   (View)

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PROMISE’s First Thunderbolt-enabled Device Released

Published:2011/7/15 3:26:00 Author:Amy

It is said that PROMISE Technology Inc. has unveiled its Pegasus line with high-performance hardware RAID storage systems. It is the first peripheral devices which use Intel’s Thunderbolt IO technology for data transfers among multiple devices and device types that use different protocols with a single cabling technology. Intel’s Thunderbolt is developed in conjunction with Apple, which is an interconnect ...   (View)

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The June Three-Month Average Global Chip Sales Will Lower Than Expected

Published:2011/7/15 2:58:00 Author:Phyllis

It is predicted that the June three-month average of global chip sales would reach $25.445 billion and this assumes no or minor sales revisions for either April or May’s previously published actual sales. Also, according to the reports published by the World Semiconductor Trade Statistics organization in May, the three-month average of global chip sales for June was predicted to be $25.03 billion. However, it turns...   (View)

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