Circuit Cellar Ink 66
January 1996

Table of Contents

2 Ken Davidson	Task Manager Bear Skins and Stone Knives
6	Reader I/O Letters to the Editor
8 Harv Weiner	New Product News
14 Brian Millier	Microprocessor-Controlled High-Voltage Power Supply Component integration is bringing some very odd feature mixes. Brian shows us his unusual project -- constructing a power supply with a variable voltage of 500-1800 V and a maximum current of 100 mA. Download: HVPS.ZIP Note: Breaking the connection between the transformer secondary and the core may create a dangerous situation if the transformer has poor isolation between the core and the winding.
26 Edward Schram	Push-Pull Switching Regulator Design and Application Too often power-supply changes force a design into a corner. Ed spends some time looking at how and when to choose a power supply. Surprisingly, it's not necessarily best to decide beforehand. Note: This power-supply design is dangerous because the 5V feedback to the controller IC eliminates any primary-to-secondary isolation.
34 Michael Rosenfield	Energy Management in Motor Control The MTE1122 controller staves off the energy-consuming monster -- namely, the electric motor. By matching the capability of the motor to the workload, the processor reduces electricity waste up to 58%.
42 Ken Pergola	The Micro-bRISC Device Programmer Tackling Microchip's Midrange Arsenal of PICs PIC development tools abound -- but their price is often prohibitive. Here, Ken introduces us to the hardware and software aspects of a low-cost, high-performance PIC programmer. Download: MICBRISC.ZIP
52 Eric Rasmussen	Alpha's PALcode Building on the foundation of the Alpha article in INK 61, Eric discusses the role of PALcode in Alpha architecture. After defining what PALcode is, Eric suggests how to use it in the PALmode environment.
56 Don Lancaster	Nonlinear Graphics Transforms Shortcuts to Stunning Graphics In graphics, you need to bend, twist, squash, or stretch an image. Although linear graphics transforms are standard, Don is more interested in the exotic stuff of nonlinear transforms. Download: NONLINEA.ZIP
62 Ed Nisley	Firmware Furnace Part 1: Getting Vid-Link in Sync Ed updates an ancient project -- the ImageWise receiver board -- by adding HCS TV status display. In this first article, Ed looks at how the hardware generates video sync. His emphasis: wringing precise timing from overworked hardware.
72 Jeff Bachiochi	From the Bench Programmability Without Volatility: Ditch Those Back-up Batteries Jeff's in the market for fast static RAM. His find: Simtek's NVSRAM, a chip which brings together the speed of SRAM and the stability of an EEPROM's nonvolatile storage. Jeff shows us how this memory eases project implementation.
76 Tom Cantrell	Silicon Update The Little '486 That Could It runs neither DOS nore Windows, but the NS486SX is still a '486. Although it lacks real and virtual modes and hence backward compatibility, it Tom's opinion, it still has a lot to offer. Listen in to see if it's the chip for you.
65	Advertiser's Index
83 Ken Davidson	ConnecTime -- Excerpts from the Circuit Cellar BBS
96 Steve Ciarcia	Priority Interrupt Livin' and Learnin'

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