Project Solutions

Cost optimized mass flow meters

Published:2011/8/22 22:57:00 Author:Phyllis

Sensirion presented a new generation of mass flow sensors with patented CMOSens£ technology. The’ main advantage of the CMOSensl EcoLine was its very wide flow range (0-200 In/min with only one instrument) at an attractive price, especially for OEM applications. Thanks to the fusion of a thermal sensor element with the readout circ...   (View)

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The project （1）

Published:2011/8/22 22:48:00 Author:Phyllis

This project has a modular structure, so it can easily be adapted to individual preferences. It consists of a general-purpose power supply board, an input selector board and the main circuit board, which holds the volume control IC and microcontroller. An LC display module, a keypad and an IR remote control unit complete the package. ...   (View)

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DELPHI FOR ELECTRONIC ENGINEERS: Part 2 - Programming a calculator （4）

Published:2011/8/22 22:47:00 Author:Li xiao na

By Herman Bulle Processing layer The function IntToStr (’integer to string’) converts a number into a line of text (text siring), and this text siring is assigned to Label I .Caption. This causes the result to be placed on the(View)

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RFID Detector for 13.56 MHz: Spot RFID tag transmitters from a distance 2

Published:2011/8/22 22:43:00 Author:Amy

Gert Baars A dedicated receiver The detuning and resonance effects mentioned above take place at rela­tively small distances from the trans­mitter, say, two meters or less depend­ing on TX power and antennas used. To be able to spot an active 13.56-MHz RFID transmitter from a greater dis­tanc...   (View)

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New range of component kits

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

Fast Components Limited, a new component supplier was targeting hobbyists with its brand new range of component kits. Co-founder Thomas Arundel said Electronic hobbyists have had a rough time of late. Leaded components are becoming more difficult to find, and incumbent suppliers are imposing ’small order’ or high shipping charges . As a result, the Fast Components team were offering a fresh and more economic way t...   (View)

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RFID Detector for 13.56 MHz: Spot RFID tag transmitters from a distance 1

Published:2011/8/22 22:27:00 Author:Amy

Gert Baars As we all know, checkout gates in highstreet stores will faithfully sound an alarm if you walk out with an item not ’cleared’ by checkout staff, i.e., paid for. This article describes a sensitive detector that will equally faithfully produce a sound in response to pulses picked up from an 1 3.56 MHz RFID ta...   (View)

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MPLAB® PM3 Universal Device Programmer

Published:2011/8/22 22:26:00 Author:Phyllis

Microchip’s MPLAB® PM3 Universal Device Programmer was capable of supporting all of Microchip’s PIC® microcontrollers (MCUs) and dsPIC® digital signal controllers (DSCs). The PRO MATE® II universal programmer had been previously rated one of the leading programmers in CMP’s 2002 Embedded Market Study, and the MPLAB P...   (View)

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30-mA LED Dimmer

Published:2011/8/22 22:08:00 Author:Phyllis

By Eberhard Haug If you’ve ever tried dimming a LED with a simple potentiometer, you know that the approach does not work very well. Just as with ordinary diodes, the voltage-current characteristic of LEDs is far from linear. The result — depending on the potentiometer setting the LED brightness will hardly chang...   (View)

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HIGH-END POWER AMP-High-class watts （8）

Published:2011/8/22 22:02:00 Author:Phyllis

By Ton Giesbets Alignment After everything has been assembled and the wiring has been completed, you come to the moment when you switch on the amplifier for the first time. As a precautionary measure, connect 33 il, 5 W resistors in series with the power supply lines before switching on the amplifier, just in cas...   (View)

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DELPHI FOR ELECTRONIC ENGINEERS: Part 2 - Programming a calculator （3）

Published:2011/8/22 21:58:00 Author:Li xiao na

By Herman Bulle Processing layer If you press several digit buttons in succession, you want the digits to be placed in o row. This can be done by multiplying the previous number by ten and adding the current number to the result. Several operations are necessary to achieve this result. You have to store the first digit, read in the second digit, multiply the first number by ten ...   (View)

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HIGH-END POWER AMP-High-class watts （7）

Published:2011/8/22 21:46:00 Author:Phyllis

By Ton Giesbets For each power supply terminal, insert the supply leads for the amplifier boards and indicator board together in the appropriate terminal blocks. Heavy wire with a cross-sectional area of 2.5 mm2 must be used for the amplifier boards, but thin flexible wire is adequate for the overdrive indicator board. Make the supply leads for the amplifier boards as short and direct as po...   (View)

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DELPHI FOR ELECTRONIC ENGINEERS: Part 2 - Programming a calculator （2）

Published:2011/8/22 21:34:00 Author:Li xiao na

By Herman Bulle Processing layer Now you have to put the application lo work. Every process in the calculator, such as adding two numbers, consists of four steps: - entering the first number - storing the operation - entering the second number - starting processing by pressing the = button A number is formed by pressing the button tor the first digit ...   (View)

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DELPHI FOR ELECTRONIC ENGINEERS: Part 2 - Programming a calculator （1）

Published:2011/8/22 21:04:00 Author:Li xiao na

By Herman Bulle In the first installment of this series, we introduced the Delphi programming environment and described several examples that illustrate how to program in Delphi. In this installment, we take a more detailed look at the design of a somewhat more serious program. Our project here is to construct a simple pocket calculator in software. In next month’s installment, it will ...   (View)

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Replacement for the Battery: A 90-volts inverter for vintage radios

Published:2011/8/22 2:55:00 Author:Li xiao na

Prof. Martin Ohsmann Valve circuits and radios in particular are graced by vast crowds of enthusiasts. If you want to keep your prize vintage radio as authentic as possible while actually using it from time to time you need a HV (high voltage) battery or its electronic equivalent. One of the most popular types of vintage radio running off a high voltage (HV) bat...   (View)

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Walking Bug: A robot with servo-powered legs 3

Published:2011/8/22 2:25:00 Author:Amy

A. Vreugdenhil Construction On the printed circuit board designed for the Walking Bug (Figure 2) you first mount the passive parts, that is, the resistors, capacitors, ceramic resonator, connectors and miroswitches. Next, continue by fitting the l.EDs and the microcontroller (preferably in an IC...   (View)

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Free Internet must exist

Published:2011/8/22 2:20:00 Author:Li xiao na

By David Daamen Of course, there’s no such thing as free Internet, but surely that does not mean you have to pay the bill? Today, with a little ingenuity and some experimentation it is often possible to tap into a neighbor’s wireless network, if it is not, or not sufficiently, protected. Many people u...   (View)

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Walking Bug: A robot with servo-powered legs 2

Published:2011/8/22 2:09:00 Author:Amy

A. Vreugdenhil Backwards You may have seen on the photographs that our Walking Bug has two ’antennae'. Two stiff wires are secured to microswitch levers, allowing the micro­controller to detect if the Bug has run into an obstacle. If that is the case, the program branches out of the main loop into a subroutine ’Back’ causing the robot to walk backwards for a while. The ’...   (View)

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Walking Bug: A robot with servo-powered legs 1

Published:2011/8/22 1:52:00 Author:Amy

A. Vreugdenhil Making a robot walk instead of drive around on wheels can be a daunting task. The author of this Walking Bug came up with a remarkably simple solution. Although our robot does not stand upright on two legs, it can actually walk using just two servos and a minimum amount of electronics. The power of the design is. of course, found in the combination of these two ele&sh...   (View)

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Step-up Converter for White LEDs

Published:2011/8/22 1:43:00 Author:Li xiao na

By Dirk Gehrke White LEDs are increasingly used for lighting applications in battery-powered equipment. To cope with the effects of a fluctuating supply voltage, a constant-current source is a must. There are now countless applications where while LEDs (light emitting diodes} are used as (background! light sources. As examples we could mention ICD or keyboard backlighting. Alter...   (View)

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Remote Thermometer for the PC: PC data logger with email alerting 3

Published:2011/8/21 22:12:00 Author:Amy

Cyril Jouanjan Viewing the results After you have entered the address and name of the sensor and activated the acquisition, click OK and you will return to the main window (Figure 4). This window is updated at the same rate as the acquisition period entered earlier. If the sensor has been detected, the corresponding name is shown on a flashing green background, with the temperature ...   (View)

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