IC Blog Center
Index 60
Smooth Ope: for Model Railway Turnouts and Semaphores （2）
Published:2011/8/4 2:09:00 Author:Li xiao na
By Ray King Printed circuit board The printed circuit board (PCB) for the turnouts control has been spaciously laid out. What’s more, it contains standard size components only. The component overlay is given in Figure 2. Easy to use PCB terminal blocks with 5 mm pin spacing are used for the connectors, except Kl which is a 3-pin pinheader for use with ready-made ser... (View)
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Smooth Ope: for Model Railway Turnouts and Semaphores （1）
Published:2011/8/4 1:58:00 Author:Li xiao na
By Ray King In many model railway layouts, electromagnets instantly snatch turnouts and semaphores from one position to another with an associated ’clunk’ noise. Armed with a PIC micro and a small servo, the circuit described in this article provides much slower, smoother, quieter and hence more realistic operation of these mechanical devices. There are a large number of model railw... (View)
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ClariTy 2x300W Class-T Amplifier Part 3: power supply assembly and alignment （4）
Published:2011/8/4 1:42:00 Author:Amy
Ton Giesberts Assembly For our prototype, we chose the ’not so quick-and-dirty’ method and fabricated our own enclosure from a sheet of aluminium. This results in an unconventional design, whose shape and proportions are determined by the dimensions of the heat sink, toroidal transformer, power-supply capacitors and power supply board (Figure 2). The heat sink forms the fr... (View)
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Design Your Own IC--Part 2: CPLDs in practice （6）
Published:2011/8/4 1:29:00 Author:Li xiao na
By Paul Goossens Counter If you analyse the Verilog code, you will see that the value of register temp is incremented on each clock pulse. As soon as the register reaches the value 4,000,000, register D is incremented by the value ’1’, temp becomes ’0’ and output SLOW becomes ’1’. If register temp has not yet reached the value 4,000,000, SLOW receives the value ’0’. With a 4.000-MHz... (View)
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ClariTy 2x300W Class-T Amplifier Part 3: power supply assembly and alignment （3）
Published:2011/8/4 1:16:00 Author:Amy
Ton Giesberts Main power supply The compactness of the amplifier is offset by the sheer mass of the power supply. Of course, we could have also developed a switch-mode power supply, but it would have to be a supply that could deliver a good 40 A at a bit less than +/- 60 V. That would be a challe... (View)
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Design Your Own IC--Part 2: CPLDs in practice （5）
Published:2011/8/4 1:14:00 Author:Li xiao na
By Paul Goossens Latch The final block in the schematic is a latch. A latch is also a frequently used type of component in digital designs. The operation of a latch is actually quite simple. As long as the clock input is T, the latch’s output must be the same as its input. If the input state changes, the out... (View)
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ClariTy 2x300W Class-T Amplifier Part 3: power supply assembly and alignment （2）
Published:2011/8/4 1:02:00 Author:Amy
Ton Giesberts Auxiliary voltage and switch-on delay The 10-V supply for the output stage is also powered by a separate transformer (TR2). After rectification and filtering, the voltage is stabilised using a standard positive 10-V regulator. If a 10-V regulator is difficult or impossible to obtain, a 9-V type can also be used. Two different types of transformer are shown on... (View)
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Design Your Own IC--Part 2: CPLDs in practice （4）
Published:2011/8/4 0:45:00 Author:Li xiao na
By Paul Goossens Always @ Up to line 46, there’s nothing new to be seen. But in line 46 you can see something added to the keyword always: an @ character followed by a comparison. This code segment can also be seen in Listing 2. The @ sign indicates that the procedural statements belonging to this always statement are only allowed to be evaluated (but not ’executed’... (View)
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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)
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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)
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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)
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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)
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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)
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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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Drop-in Bluetooth product family
Published:2011/8/3 3:44:00 Author:Amy
SMART Modular Technologies, Inc. releases its new line of fully integrated 90191 Bluetooth modules. It aims to decrease development time and speed time-to-market for Bluetooth-enabled products, these innovative modules can be easily integrated into new or existing product designs to offer Bluetooth functionality. This product family includes board-to-cable modules and board-to-board modules m... (View)
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