Circuit Cellar Ink 28
August/September 1992

Table of Contents

2 Ken Davidson	Editor's INK Process This
4	Reader's INK Letters to the Editor
8 Harv Weiner	New Product News
14 Michael R. Smith	To DSP or Not to DSP Will a RISC chip do it Better? Everyone usually assumes that to do true digital signal processing, a dedicated DSP chip is necessary. Depending on the application, today's high-speed RISC processors may do just as good a job.
26 Gerald McGuire	Analyze Voice in the Palm of Your Hand A spectrum analyzer is normally made with banks of analog filters. Using a popular DSP, this project will display the frequency content of a voice on an oscilloscope screen using just four chips and some glue. Download: ADSP2101.ZIP
34 Steven Avritch	Shaping the World of Sound Have you ever tried to pick voice out of the static when listening to a radio transmission? The DSP2000 Audio Waveform Shaper was built for just such a purpose and succeeds quite nicely. Download: DSP2000.ZIP
40 John N. Hait	The Dawning of the Light Transistor An Optical Computer Method Using Interference Fringe Component Regions That super '586 system sitting on your desk could soon be replaced by a hologram. Find out about the world's first photonic transistor and what it could mean to computing as we know it.
50 Tom Dahlin Don Krantz	Closing the Loop on DC Motor Control Stepper motors have been the mainstay of most precision motor control applications. By using the LM628 for control, a DC motor may be a suitable replacement for a stepper and provide some additional benefits.
58 Charles R. Conkling, Jr.	Designing with Programmable Logic We've all seen those mysterious little chips called PLDs used in circuits. There are some very definite guidelines that must be followed when using PLDs, as Charles Conkling's years of experience have shown.
70 Ed Nisley	Firmware Furnace HCS II War Stories and I/O Links Four pairs of eyes trained to pay attention to detail couldn't possibly miss an obvious blunder, could they? Find out as Ed describes a debugging session that took far too long plus more HCS II tricks. Download: ADIODIO.ZIP
80 Jeff Bachiochi	From the Bench Approaching PCB Nirvana The search for the best way to make your own prototype PC boards is often like the search for the Holy Grail. Sir Jeff's come pretty close this time with his newest drinking cup.
86 Tom Cantrell	Silicon Update The Ultimate Desk ACESSory? If DEC and Philips/Signetics have anything to say about future PCs, your days of crawling around under your desk routing cables may soon come to an end.
92 John Dybowski	Practical Algorithms Power Code In battery-powered systems, power consumption is of the utmost importance. It's not always necessary to build in complicated power- control circuits to reduce current consumption, though.
97	Advertiser's Index
98 Ken Davidson	ConnecTime -- Excerpts from the Circuit Cellar BBS
112 Steve Ciarcia	Steve's Own INK Cost is in the Eye of the Beholder

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