Project Solutions (2011/08/17)

Intelligent Clap Switch: manual remote control with extras （2）

Published:2011/8/17 22:42:00 Author:Li xiao na

Jorg Prim Software When the signal level at GP1 goes low (clap detected) the program waits for approximately 200 ms during which time the LED glows red. After this period the LED switches to green and the software samples the input for approximately three seconds. If a second clap is detected during this period, the (View)

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ANTI-NOISE （2）

Published:2011/8/17 22:36:00 Author:Phyllis

If passive ear protectors, such as earplugs or closed headphones, are combined with active noise compensation, noise in the frequency range from 25 Hz to 500 Hz can be attenuated by more than 25 dB (Figure 5). The total effect of active and passive noise compensation is around 30 dB over the entire audio spectrum. Closed systems are particularly suitable for aircraft with a high noise level in the ...   (View)

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ANTI-NOISE （1）

Published:2011/8/17 22:20:00 Author:Phyllis

The sound of silence Noise has a serious impact on the environment as well as on human beings. Besides classical sound reduction techniques such as insulation, researchers are trying to attack the root of the problem using electronic means. They have already had some success. Sometimes it happens that an underlying physical process is well understood on paper, but the job of trans...   (View)

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Altium FPGA LiveDesign Kit -Designing with FPGAs （3）

Published:2011/8/17 21:53:00 Author:Phyllis

By Paul Goossens Debugging The real power of the software is really only utilized when you want to carry out measurements on your design. It is obviously impossible to measure internal signals of the FPGA with a probe, so most examples are provided with a JTAG interface. With this you can (without di...   (View)

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Altium FPGA LiveDesign Kit -Designing with FPGAs （2）

Published:2011/8/17 21:41:00 Author:Phyllis

By Paul Goossens Software The accompanying software is an evaluation version of the Protel/Nexar software suite from Altium. This version is time limited (30 days). Keep in mind that these 30 days start counting down from when the package is sent! It makes sense therefore, to install and try everything out immediately once you receive the package. This software looks very po...   (View)

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Altium FPGA LiveDesign Kit -Designing with FPGAs （1）

Published:2011/8/17 21:31:00 Author:Phyllis

By Paul Goossens Modern circuits make ever more extensive use of FPGAs. Special software is required when designing with these devices. One of the companies that produce such software is Altium. In order to allow their software to be evaluated, they offer a cheap evaluation kit. Once the evaluation period has expired, the kit is still very useful as a development platform for your own desig...   (View)

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PLAY SOLITAIRE .....packed in an AT90S micro （2）

Published:2011/8/17 21:17:00 Author:Phyllis

By Andy&Rose Morrell Rules for playing Solitaire As the name suggests, Solitaire is a game to be played on your own. The board is made up of 33 LEDs laid out in a cross shape, where a piece on the board (or ’peg’) is indicated by an active LED. The aim of this game is to be left with as few pieces...   (View)

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PLAY SOLITAIRE .....packed in an AT90S micro （1）

Published:2011/8/17 21:03:00 Author:Phyllis

By Andy&Rose Morrell This version of Solitaire is played with an array of LEDs instead of pegs, with a microcontroller behind the scenes to check if you’re any good at playing. As you’ll soon find, the game is challenging and addictive! This project is a fine instance of a microcontroller and its residen...   (View)

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Wond＇rous Light Chain

Published:2011/8/17 3:03:00 Author:Amy

With the Festive Season upon us, it seems fit­ting to devote this month’s Quizz’away instal­ment to the perennial problems associated with Christmas tree lighting. Conventionally, lamps are connected in series (Figure 1) and this immediately creates a problem: when one lamp fails, it breaks the series network and all other lamps will also go out. But that’s not all, because in the dark you will have hard ti...   (View)

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LED Christmas Tree: Plus additional seasonal circuit

Published:2011/8/17 2:37:00 Author:Amy

This flashing LED mini only dead simple to build but the design is also repeatable and very reliable in operation. In fact an ideal last-minute project to brighten up the house or office in the run-up to Christmas. It can sometimes be satisfying for the electronics enthusiast to build some­thing that adds a personal touch to a special occasion. The mini Christmas tree design described here fits the bill...   (View)

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Intelligent Clap Switch: manual remote control with extras （1）

Published:2011/8/17 2:15:00 Author:Li xiao na

Jorg Prim A clap switch circuit is a classic beginner’s project. Equipment can be switched on and off by just clapping your hands. Add a tiny microcontroller and you can easily build-in some more useful futures. The microcontroller in this circuit makes it a simple job to add some useful features that are no...   (View)

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Power Supply for USB Devices

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

Roman Mittermayr More and more equipment is sold that runs off internal rechargeable batteries. Although a matching charger is usually supplied in the package, there are also devices that can only be charged via a USB port. That is not surprising in the case of USB MP3 players, which have to ’dock’ in the PC an...   (View)

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Voltage regulator calculation

Published:2011/8/17 1:51:00 Author:Amy

Victor Himpe Before you con design on adjustable voltage regulator into your circuit, or do a redesign, you need to calculate the values for two resistors. This is not diffi­cult in itself, but actually finding the right resistors may po...   (View)

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Power Supply Design: Information, dimensioning and simulation

Published:2011/8/17 1:44:00 Author:Li xiao na

Harry Baggen ＆ Karel Walraven Designing a power supply for one of your circuits can be plain sailing but also turn out to be a surprisingly complex job. Switch-mode power supplies in particular may present a real challenge before useful results are obtained. Fortunately, several semiconductor manufacturers come to our rescue. (View)

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Continuous Flow Soldering

Published:2011/8/17 1:35:00 Author:Amy

From reader correspondence we know that lots of you are still hesitant about soldering SMDs (surface-mount devices), particularly integrated circuits. We won’t say it’s a piece of cake, but maintain that there’s no rea­son to start panicking about SMDs, as accurate soldering does the trick. Using the right tools and some ba...   (View)

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Delphi for electronic engineers: Part1-the first steps （4）

Published:2011/8/17 1:13:00 Author:Li xiao na

Detlef Overbeek ＆ Anton Vogelaar The third program -an alarm system This program provides protection against burglary and fire in a dwelling. The protected dwelling is divided into four zones. If there is an alarm condition in one or more zones this should be indicated both visually and aurally. The alarm system is implemented as follows. Each zone contains a number of sensors with norma...   (View)

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Heathkit TC-2P Tube Checker

Published:2011/8/17 1:04:00 Author:Amy

Jan Buiting I came across this gem in an unexpected place, namely a flea market for vintage motorcycle parts! Standing between heaps of pistons, wheels and engine parts, the owner claimed it was some kind of electrical instru­ment capable of testing well, a lot of things I guess . When the small case was opened I immediately recognized a Heathkit lube tester that had def­initely ...   (View)

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