Circuit Cellar Ink 78
January 1997

Table of Contents

2 Ken Davidson	Task Manager New Toys
6	Reader I/O Letters to the Editor
8 Harv Weiner	New Product News
14 Bill Payne	Low-Power Solid-State DC Motor Control Finding mechanical switches passe? Well then, why not try National Semiconductor's LM1951 and LM2941? They do the job and provide low-power DC control.
20 Dean Hoyt	A Radio-Controlled Car and a 68HC11 Microprocessor Automated devices are becoming critically important for safety as well as convenience. Dean shows how he added a 68HC11 micro to a radio-controlled model so it could record and then retrace its path. Download: RADIOCAR.ZIP
26 Fred Eady	Using Microchip's PIC14000 Battery-Management Chip Fred introduces us to Microchip's new mixed-signal PIC14000. It has all the features of a PIC but also 192 bytes of RAM, 4KB of EPROM, and analog peripherals. It's a lot of complexity in a flexible package.
34 Brian Millier	Pulse'05 Pulse Generator Bring a lot of work home where you don't have much test equipment? Brian shows how to make a low-cost pulse generator composed of two ICs -- Motorola's 68HC705J1A and AMD's AM9513APC. Download: pulse3.zip
42 Do-While Jones	The Global Positioning System Part 2: Implementation Problems and Solutions GPS receivers tell you how far you are from the center of the earth, not where you are on the earth's surface. Do-While shows us how to get Cartesian coordinates from the geocentric coordinates used by GPS.
50 Steve Ciarcia	MicroSeries Applying the HCS II, Part 2: A New Approach to High-Performance System Expansion Since its introduction four years ago, HCS II has been a real hit. Here, Steve introduces Answer MAN, a new network module that adds low-cost, low-power analog and digital I/O to the HCS network.
68 Jeff Bachiochi	From the Bench Liquid Crystal Displays -- First You See 'Em, Then You Don't When you see LCDs, do you think polarized shades? No? Well, perhaps you should. As Jeff shows, the LCD uses similar technology to accomplish essentially the same thing -- reflecting light into just the place you want it.
74 Tom Cantrell	Silicon Update Haute Chips After visiting this year's Hot Chips show, Tom has plenty to say about the increasing availability and speed of transistors. He discusses the latest tradeoffs between clock rate and complexity.
65	Advertiser's Index
81 Ken Davidson	ConnecTime -- Excerpts from the Circuit Cellar BBS
96 Steve Ciarcia	Priority Interrupt Hardly a High-Definition Option

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