Circuit Cellar Online -This Month

THE MAGAZINE FOR COMPUTER APPLICATIONS Circuit Cellar Online offers articles illustrating creative solutions and unique applications through complete projects, practical tutorials, and useful design techniques.

	LINUX DRIVES WEEDER I/O BOARDS
		by Jack Dennon When using a product in the real world, unexpected requirements inevitably occur. Having total control over things helps when it comes to handling these requirements. Sound impossible? Apparently not to Jack, who shows us how to get the level of control we need by combining Linux with a simple homegrown device driver. December 2001
	JUMP ON THE BUS
		Taking a Look at the USB by Don Powrie Wanting to use the USB but lacking in the knowledge and experience necessary to create a device driver can cause some aggravation. When Don realized that there was a limited supply of information in this area, he had to come up with another solution. In this article, he takes us through that solution and shows us that a little knowledge goes a long way. December 2001
	IMAGE PROCESSING FUNDAMENTALS
		Part 2: Math, Math, Math by James Antonakos Rounding out his series on image processing, this month James takes us through several more operations in pixel manipulation. In doing so, he shows us that there's one sure key to extracting as much useful information as possible from an image—mathematics. This article will have you wishing for more, and James promises to provide. December 2001
	LOGIC DESIGN REVISITED
		by George Martin This month, George takes two subjects that he's talked about in the past (Lattice Semiconductor's new design tools and A quad B converters using PALs) and combines them together. And, what did he come up with? Logic design for the more complex field programmable devices. December 2001
	A PLAY ON DATA
		Silicon Update Online by Tom Cantrell Tom admits that pigs might start flying before he changes his messy filing system. So, when he recently went looking for an article he wrote long ago, it got him thinking about something else that got filed away, never to be found again—MiniDisc. It also got him thinking that maybe he's better off not trying to predict the unpredictable. December 2001
	WHAT'S YOUR ENGINEERING QUOTIENT?
		Test Your EQ presents some basic engineering problems for you to test your engineering quotient. Problem 1—Anyone who has worked with spectral analysis knows that a squarewave contains all of the odd harmonics, where the amplitude is one over the frequency ratio. In other words, if the fundamental frequency has an amplitude of one, the third harmonic has an amplitude of one third, and so on. What is special about the following waveform, which can be constructed by taking two squarewaves and adding them together after shifting one by one-sixth of a period relative to the other? Draw a phasor diagram that explains the special characteristics of the waveform. Problem 2—Draw a hybrid circuit using flip-flops and opamps that can produce the above waveform. The rest of this month's questions
	RESOURCE LINKS
		Each month Circuit Cellar's Resource Links provide helpful links and information on a variety of featured topics. Dynamic Synchronous Transfer Mode by Brant Schroeder Video Capture Cards by Brant Schroeder
	NEW PRODUCT NEWS—edited by Rick Prescott
		DIGITAL POTENTIOMETERS USB RELAY MODULE INTERNET MODEM SINGLE BOARD COMPUTER DATA ACQUISITION DEVICE New Product submissions may be sent to Rick Prescott 4 Park St. Vernon, CT 06066
	PRIORITY INTERRUPT
		Who's Really Organized Anyway ? by Steve Ciarcia Remember when the reason for having a computer was because it was supposed to make you more organized? The mountains of paper cluttering your life would dissolve and you would become more efficient. I can�t speak for you, but with every new iteration of computing power and operating system, the mess around me gets deeper and deeper. I don�t feel more efficient these days.... December 2001
	CIRCUIT CELLAR's Print Magazine
		Take advantage of more than 12 years of engineering editorial experience with Circuit Cellar's print magazine! Full of unique, application-oriented articles. Come see what's in this month's publication! December 2001
	COPYRIGHT
		CIRCUIT CELLAR� Online, (ISSN 1527-8131) and Circuit Cellar are published monthly by Circuit Cellar Incorporated, 4 Park Street, Vernon, CT 06066 (860) 875-2751. Entire contents copyright � 2001 by Circuit Cellar Incorporated and ChipCenter, Inc. All rights reserved. Circuit Cellar and Circuit Cellar INK are the registered trademarks of Circuit Cellar Inc. Reproduction of this publication in whole or in part without written consent from Circuit Cellar Inc. is prohibited. Disclaimer