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Goodbye ＇16, welcome PIC 18F: meet the PIC18F series （part1） 3

Published:2011/8/5 6:34:00 Author:Amy

By Ron Coates Indirect addressing If you thought, direct addressing was good, things get even better with indirect addressing. This is because we have a 12-bit number to use for addressing, giving us direct access to all 16 banks. After all, both 2** and 16x256 equal 4,096. First of all, there are now three FSR registers, FSR0, FSR1 and FSR2. Associated with these are three ...   (View)

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Goodbye ＇16, welcome PIC 18F: meet the PIC18F series （part1） 2

Published:2011/8/5 6:08:00 Author:Amy

By Ron Coates Direct addressing Direct addressing is much easier than with the P1C16F series and we’ve reasons to doubt if most programs will need to use banking commands at all. As you will see from the memory map, the first half of bank 0 and the second half of bank 15 have been desig­nated as the Access Bank. From reading the Microchip data sheet, you would think tha...   (View)

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FreePICProg: cheap'n easy PIC programming

Published:2011/8/5 1:53:00 Author:Li xiao na

By David Daamen The PocketPong game found elsewhere in this issue was designed around a PIC18F452 for which, we have to admit, no suitable programmer was ever published in this magazine. Sure, investing in a commercially produced programmer is an option, but making one yourself is cheaper and much more fun, too! We reckon th...   (View)

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USB EMBEDDED HOST CONTROLLER （4）

Published:2011/8/5 1:43:00 Author:Phyllis

By Mark Schultz Using the frameworks to read a USB Flash drive Now it is time to create some application code that actually does something. At this point, we have created a driver and have a means to match it up to a device by class and subclass matching. Next up is to add code to the driver for its start an...   (View)

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Pocket Pong: a primeval game cast in modern hardware （2）

Published:2011/8/5 1:41:00 Author:Li xiao na

By Andy Morell Operation The game is played using two potentiometers and two switches. SI serves to serve a ball. S3 is the speed selector. When it is closed, the ball moves faster making the game more difficult to play. There is a connection for a third switch (S2) but this is not used in the Pong game. P3 and P4 may be ordinary rotary potentiometers but slide pots will of cour...   (View)

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USB EMBEDDED HOST CONTROLLER （3）

Published:2011/8/5 1:21:00 Author:Phyllis

By Mark Schultz Framework Flow The framework code will execute as follows. On power on reset, the EZ-Host microprocessor will initialize all registers and counters as well as all device structures. It will then enter a loop: -Check the host USB ports for any changes in status (devices inserted or remov...   (View)

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Pocket Pong: a primeval game cast in modern hardware （1）

Published:2011/8/5 1:18:00 Author:Li xiao na

By Andy Morell Provided they manage to recognize them in the first place, youngsters will label classics like Pacman and Pong as video games although historically they are ’video games’, the concept behind them dating back to the 1950’s. In this article you’ll find a modern (computer) version of such a prehistoric game that — as far as we are concerned — has not lost any of its compulsive c...   (View)

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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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