Project Solutions (2011/08/04)
Index
Ten Years After: Dab in Europe （4）
Published:2011/8/4 22:51:00 Author:Li xiao na
By Hans Weber Bad inside If you look for components for DAB receivers, you will quickly find two British manufacturers: FrontierSilicon and RadioScape. FrontierSilicon’s product line is based on the Chorus FS1010. This IC is a highly integrated multimedia processor with ADC input, a DSP processor core, DAB coprocessors, on-chip RAM and cache memory, and a wealth of on-board peripher... (View)
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Goodbye ＇16, welcome PIC 18F: meet the PIC18F series （part1） 1
Published:2011/8/4 22:43:00 Author:Amy
By Ron Coates Several articles using the PIC16 series of Microchip microcomputers have appeared in this magazine but so far there has been little or no practical use of their more powerful cousins in the 18F practical use of their more powerful cousins in the I bl series. The devices in the l8Fxx2 series of microcont... (View)
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Ten Years After: Dab in Europe （3）
Published:2011/8/4 22:37:00 Author:Li xiao na
By Hans Weber The receiver market The end-user market is divided into four major segments. The first of these is car radios, which in Germany was initially regarded as the most important market segment- Prices in this segment are relatively stable. The market leader. Blaupunkt. offers its Woodstock 53 (!) model for 579 euros. The Grundig Allixx is somewhat less expensive at 399 ... (View)
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Ten Years After: Dab in Europe （2）
Published:2011/8/4 22:25:00 Author:Li xiao na
By Hans Weber The 99-quid radio The situation in Great Britain is quite different. Here the market started to move in late 2002. It was recognized that the only way to achieve widespread market penetration of DAB receivers was via the price. The ’magic boundary’ was considered to be a receiver under the 100... (View)
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Ten Years After: Dab in Europe （1）
Published:2011/8/4 22:13:00 Author:Li xiao na
By Hans Weber Preparations for the market introduction of DAB digital radio have been underway in Europe for more than ten years. Although setting up the transmitter network proceeded rapidly in most countries of western and central Europe, sales figures in the receiver market were initially modest. In the UK, sales came up to speed starting in late 2002, and recently there are increasing s... (View)
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Clarity 2x300W Class-T Amplifier-Part 2: building amplifier board （5）
Published:2011/8/4 22:00:00 Author:Phyllis
By Ton Giesberts Coming up All that’s left now is the power supply and the wiring diagram. We’ll deal with them in next month’s issue, when we’ll also present some measured results for the fully assembled amplifier. Items such as input and output filters and EMC problems will be handled in a separate arti... (View)
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Slave Flash for Digital Cameras: Don’t throw away your old flashlight （2）
Published:2011/8/4 21:55:00 Author:Amy
Udo Burret Construction Building this circuit is unlikely to cause problem if you use the printed circuit board artwork shown in Figure 2. Do pay attention to the orientation of the diodes, ICs and Tl. The phototransistor’s case is not unlike that of an LED. The (View)
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Clarity 2x300W Class-T Amplifier-Part 2: building amplifier board （4）
Published:2011/8/4 21:49:00 Author:Phyllis
By Ton Giesberts Coil winding Winding the output inductors is not difficult, but you must pay careful attention to the winding method. With the selected wire diameter of 1.5 mm (16 SWG), the 29 turns will not fit on the selected core in a single layer. To keep the internal capacitance as small as possible... (View)
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Clarity 2x300W Class-T Amplifier-Part 2: building amplifier board （3）
Published:2011/8/4 21:38:00 Author:Phyllis
By Ton Giesberts Power supply and ground The main supply voltage is connected to the circuit board using flat (car-type) terminals. This allows very large currents to flow and makes it easy to connect the board to the power supply. Special electrolytic capacitors are fitted across the power supply terminals to decouple the worst RF current spikes. We have done our best to implement ... (View)
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Clarity 2x300W Class-T Amplifier-Part 2: building amplifier board （2）
Published:2011/8/4 21:24:00 Author:Phyllis
By Ton Giesberts Suppressing inductive spikes Due to the physical dimensions of the components, parasitic self-inductance and overshoots will always be present. The consequences of this, particularly the inductive spikes (backemf) from the inductors in the output filters, can be partially suppressed... (View)
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Clarity 2x300W Class-T Amplifier-Part 2: building amplifier board （1）
Published:2011/8/4 21:18:00 Author:Phyllis
By Ton Giesberts A pulse-width-modulated output stage with hi-fi characteristics is something rather special. We already described various aspects of this design in the June 2004 issue. Following that introduction, in this installment we continue with a description of how to build this powerhouse. The pulse-width modulated (View)
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Slave Flash for Digital Cameras: Don’t throw away your old flashlight （1）
Published:2011/8/4 2:41:00 Author:Amy
Udo Burret Although most digital cameras have a built-in flash, a connection for an external flashlight is rarely seen. Still, on some occasions it’s useful to have just a tad more light and that’s why we propose a simple add-on. As many of you will be able to avow, the light capacity of the flash facility ... (View)
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ClariTy 2x300W Class-T Amplifier Part 3: power supply assembly and alignment （5）
Published:2011/8/4 2:13:00 Author:Amy
Ton Giesberts Alignment The only alignment that is required is to adjust the dc offsets of the outputs, which can be done after the amplifier is assembled but should preferably be done during testing before final assembly. Naturally, the dc offset voltages must be set to zero. The offsets must be adjusted (using PI and P2 on the amplifier board) with the amplifier switched on a... (View)
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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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