Circuit Cellar Ink 28
August/September 1992

Table of Contents


Ken Davidson

Editor's INK

Process This


Reader's INK

Letters to the Editor


Harv Weiner

New Product News


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.


Gerald McGuire

PDF 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


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


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.


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.


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.


Ed Nisley

PDF 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.



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.


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.


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.


Advertiser's Index


Ken Davidson

ConnecTime -- Excerpts from the Circuit Cellar BBS


Steve Ciarcia

Steve's Own INK

Cost is in the Eye of the Beholder

FTP Directory for INK 28
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