Project Solutions

Bluetooth Remote Control （3）

Published:2011/8/3 21:20:00 Author:Phyllis

By Richard Hoptroff What can I do with it? The purpose of this inset is to provide incentives to developing projects using the FlexiPanel-Bluetooth module from Parallax. Have look what can be done with it! The project documentation and software are available as free downloads. A Bluetooth Protocol (View)

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Bluetooth Remote Control （2）

Published:2011/8/3 21:02:00 Author:Phyllis

By Richard Hoptroff Modified BoE The circuit diagram of the modified BoE (Board of Education) is shown in Figure 1. The ’brains’ are a BS2p (BASIC Stamp 2) module which is plugged into the 24-way socket. Like its 1999 predecessor, this BoE has an RS232 connector (K2) and a prototyping area ...   (View)

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Bluetooth Remote Control （1）

Published:2011/8/3 20:45:00 Author:Phyllis

From your PDA or mobile phone By Richard Hoptroff Bluetooth is a huge commercial success but so far hobbyists and la workers have been barred from access to ready-made modules for this wonderful new medium. The reason is simple: manufacturers like to treat their products as black boxes and are only interested in their 100-k/day production lines in the Far East or China. We oppose this attitu...   (View)

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BOGUS ELECTRONIC PARTS （2）

Published:2011/8/3 19:56:00 Author:Phyllis

By Harry Baggen Serious problem With electronic components it is not so easy to check if a part meets the specifications of the manufacturer. You could perhaps run a few logic tests on a digital IC, but it is much harder with an analogue component. It is a big problem for manufacturers of equipment to determine in time (that is, before assembly) if all paris originate from a trusted...   (View)

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BOGUS ELECTRONIC PARTS （1）

Published:2011/8/3 19:55:00 Author:Phyllis

Beware of fakes! By Harry Baggen The forgery of expensive brand-name products is an easy way to make some money quickly. Lots of products, anything from T-shirts to watches that strongly resemble the original are offered for sale, particularly in Asia, for ridiculously low prices. In recent years, even electronic components are being copied. From the outside they are indistinguish...   (View)

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Air Quality Sensors: New CO2 Sensors for Air Quality Monitoring （1）

Published:2011/8/3 4:19:00 Author:Amy

Christian Voit---Unitronic AG A CO2 sensor has been developed for specialist applications in air quality monitoring and control, offering good long-term stability, high selectivity, and a low humidity dependence. The concentration of CO2 can be used as a good indi­cator of air quality in the office or in the home. Until now...   (View)

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Design Your Own IC--Part 2: CPLDs in practice （2）

Published:2011/8/3 3:40:00 Author:Li xiao na

By Paul Goossens Structure Verilog source code is always organized using the same structure. It starts with the module declaration. This part of the code begins with the word ’module’. followed by a name, This is accompanied by a collection of inputs and outputs in brackets, separated by commas. The whole thing is terminated by a semicolon. This can be seen in lines 30-35 of our exa...   (View)

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Poor Man’s 1-GHz Active Probe: DIY Saves a Pretty Penny （2）

Published:2011/8/3 3:30:00 Author:Amy

By David Jewsbury Construction The PCB artwork is shown in Fig­ure 2. The board has been designed to allow fitting in a metal tube. All the components are surface mounted (SMD), but assembly by hand is rea­sonably easy with a fine tipped sol­dering iron and tweezers. The parts are assembled on one side of a dou­ble sided 1.6-mm thick PCB. Connec­tions are made be...   (View)

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Poor Man’s 1-GHz Active Probe: DIY Saves a Pretty Penny （1）

Published:2011/8/3 3:20:00 Author:Amy

By David Jewsbury When it is required to make a measurement at a node of an RF circuit, connecting to the circuit using a normal oscilloscope probe, even on the x10 setting can change the behavior of the circuit. For those difficult cases, you need a special probe like the one described here. Any probe presents extra impedance for the circuit to drive, usually consist­ing of som...   (View)

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Design Your Own IC--Part 2: CPLDs in practice （1）

Published:2011/8/3 3:08:00 Author:Li xiao na

By Paul Goossens Following the description of the hardware in last month’s issue (Part 1), it’s now time to start working with the experimenter’s board. We assume that you have already installed the Altera software and read the tutorial. Designing digital circuits usually amounts to repeatedly breaking down the problem into s...   (View)

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Profi Lab-Expert: Application for PC Data Acquisition Cards （2）

Published:2011/8/3 2:58:00 Author:Amy

By Hans Koerfer, Kolter Electronic Example project The data acquisition hardware can either be connected to one of the PC's ports or can take the form of an inter­nal expansion card. Before we can start on a project it is of course necessary to install the acquisition hardware (whether it is a PCI card or a (View)

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Clarity 2x300W: Class-T amplifier （5）

Published:2011/8/3 2:55:00 Author:Li xiao na

By Ton Giesberts Power supply The supply voltages for the amplifier board are provided by a second printed circuit board. This board includes, among other things, the +5V and VN10 supplies, as well as fuses for the main supply voltages. It also supplies a delayed ’un-mute’ signal that prevents switch-on ’plopping’. To avoid creating an earth loop and prevent ripple currents from flo...   (View)

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Clarity 2x300W: Class-T amplifier （4）

Published:2011/8/3 2:32:00 Author:Li xiao na

By Ton Giesberts Protection To protect the amplifier, the driver IC monitors the supply voltages and the currents through the transistors. The VPPSENSE input is used to monitor the main positive supply voltage for overvoltage and undervoltage; the VNNSENSE input is used in the same way for the main negative voltage. If the supply voltage is outside the allowable limits, the ...   (View)

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Profi Lab-Expert: Application for PC Data Acquisition Cards

Published:2011/8/3 2:24:00 Author:Amy

By Hans Koerfer, Kolter Electronic The field of measurement, control and process technology is now dominated in the professional arena by PC-based data acquisition cards. The spectrum of applications is covered by digital I/O cards, relay cards, A/D and D/A converter cards, as well as cards offering a combination of these features. The cards are available in a range of variants from a numbe...   (View)

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Clarity 2x300W: Class-T amplifier （3）

Published:2011/8/3 2:20:00 Author:Li xiao na

By Ton Giesberts Output filter Thanks to the high switching frequency, here it is only necessary to use a second-order filter with a relatively high corner frequency (resonant frequency 101 kHz). To dampen the Q factor of the filter, which is primarily important if no load is connected, a Zobel network is placed at the output, since otherwise resonance currents and ringing signals a...   (View)

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Clarity 2x300W: Class-T amplifier （2）

Published:2011/8/3 2:00:00 Author:Li xiao na

By Ton Giesberts Modulator The modulator amplifies the signal from the input stage to the output level. It is the second part of the overall amplification, or better said, the actual gain stage. The processor provides a switching waveform that depends on the level and frequency of the signal. With no input signal, the average value of the switching frequency is approximately 700...   (View)

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Clarity 2x300W: Class-T amplifier （1）

Published:2011/8/3 1:38:00 Author:Li xiao na

By Ton Giesberts This top-end amplifier proves that high power does not have to mean a large, heavy design. Although this amplifier is highly efficient (and thus compact), its specifications easily surpass those of quite a few conventional designs. If we’ve given you the idea that the fully assembled amplifier is as light as a feather, perhaps we should qualify our statement somewha...   (View)

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Virtual Soldering （4）

Published:2011/8/3 1:33:00 Author:Amy

By Dr. Thomas Scherer What else can LabVIEW do? Any program created using LabVIEW can be stored as a collection of Vis in an individual file which can then be run (within the development environment) with a double­click. There is also a compiler which can generate EXE or DLL files, protecting your ideas from being copied. For those hardy souls who want to integrate fragments of ...   (View)

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Proteus VSM

Published:2011/8/3 1:31:00 Author:Phyllis

Also simulates microcontrollers! By David Daamen Schematic drawing, PCB designing and off you go testing the design. These days we do everything on a PC. Simulation programs have now reached a level of sophistication that includes co-simulation of a microcontroller in your design. Proteus VSM from Labcenter ...   (View)

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Bike Tail Light With Standlight （2）

Published:2011/8/2 22:18:00 Author:Phyllis

By ralf Nolde Construction The circuit can be built on the single-sided circuit board. The PCB layout accepts conventional wire-ended components with some of them fitted to the underside (alternatively you can keep them all on the same side by fitting R5 over the top of D5/D6 and R6 under rectifier Bl). The (View)

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