Project Solutions (2011/08/03)
Index
Design Your Own IC--Part 2: CPLDs in practice （3）
Published:2011/8/3 22:40:00 Author:Li xiao na
By Paul Goossens Programming As already mentioned in Part 1 of this article, to program the CPLD you will need the JTAG programmer described in the September 2002 issue of Elektor Electronics. Of course, an original Altera ByteBlaster is also OK. We assume that your programmer is connected to the printer port of the PC and the JTAG connector is attached to connector K2 of the experi... (View)
View full text | Comments | Reading(322)
ClariTy 2x300W Class-T Amplifier Part 3: power supply assembly and alignment （1）
Published:2011/8/3 22:20:00 Author:Amy
Ton Giesberts As already mentioned in the previous parts of this article, this final amp needs more than just a heavy-duty symmetrical power supply. In this final part, we examine the main power supply, the other power supplies, final assembly and alignment. The analogue input portion of the TA3020 operates from a stabilised 5-V supply voltage. A stabilised 10-V auxil-iary voltage i... (View)
View full text | Comments | Reading(3569)
Air Quality Sensors: New CO2 Sensors for Air Quality Monitoring （2）
Published:2011/8/3 22:01:00 Author:Amy
Christian Voit---Unitronic AG The TGS4160 gas sensor The TGS4160 consists of a CO2-sensitive solid electrolyte cell with an internal thermistor for temperature compensation. Figure 2 shows the construction of the sensor and a cross-section through the sensor element. A NASICON disc with a diameter of 4 mm and a thickness of 0.7 mm is printed with gold electrode... (View)
View full text | Comments | Reading(1957)
USB EMBEDDED HOST CONTROLLER （2）
Published:2011/8/3 21:37:00 Author:Phyllis
By Mark Schultz SCSI Many mass storage devices use SCSI commands for communication between the host and the device. We will be using three SCSI commands to perform our file operations. The commands are Inquiry, Read Capacity and Read(lO). The format of the three SCSI commands to be used in this design is shown in Table 2. (View)
View full text | Comments | Reading(2084)
USB EMBEDDED HOST CONTROLLER （1）
Published:2011/8/3 21:32:00 Author:Phyllis
for removable mass storage devices By Mark Schultz Till now USB has been available only on personal computers, leaving large, untapped potential in the area of embedded systems. New embedded host controllers from Cypress herald a new era. An embedded system is defined as hardware and firmwa... (View)
View full text | Comments | Reading(868)
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)
View full text | Comments | Reading(653)
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)
View full text | Comments | Reading(1302)
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)
View full text | Comments | Reading(684)
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)
View full text | Comments | Reading(380)
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)
View full text | Comments | Reading(387)
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)
View full text | Comments | Reading(693)
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)
View full text | Comments | Reading(1054)
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)
View full text | Comments | Reading(2164)
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)
View full text | Comments | Reading(11522)
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)
View full text | Comments | Reading(439)
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)
View full text | Comments | Reading(1615)
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)
View full text | Comments | Reading(476)
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)
View full text | Comments | Reading(482)
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)
View full text | Comments | Reading(1410)
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)
View full text | Comments | Reading(437)
| Pages:1/2 12 |