July 1999 Issue Articles and Columns   Select Year and Month to View Other Issues

ARTICLES

THREE-AXIS CHOPPER, STEP MOTOR CONTROLLER FOR COMPUTER NUMERICAL CONTROL (CNC) APPLICATIONS — PART 3 - Dan Mauch
Configure, connect, adjust, and test the three-axis chopper driver built in last month’s article.

VOICE CHANGER - Jack Dennon
Voice changing can be an interesting application of electronics. Try out the Holtek HT8950A: an electronic circuit using a digital signal processing-type approach, but with no programming required.

EL LIGHT: PLAYING IN THE DARK - TJ Byers
EL lamps are everywhere, from cell phones to laptops. Here’s how they work, and how to make them work in your projects.

A HIGH-POWER PIC MACRO LIBRARY - Karl Lunt (PDF File 429kb)
An extensive library of PIC macros is presented here that you can add to your own assembly language projects.

USING THOSE WIDE-RANGE, ALL-MODE HANDHELD RECEIVERS - Gordon West
Competition really heats up among manufacturers of DC to daylight all-mode handheld scanning receivers. So how do you decide which one is best for you?

NEW LIFE FOR A VINTAGE AUDIO FILTER - Ron Tipton
Follow this easy conversion process for a filter that dissipates less heat and is lighter in weight than the original.

LOW LOSS ELECTRONIC SWITCH - Fernando Garcia
With the “flip of a switch”, easily go between portable and stationary power with this handy circuit.

COLUMNS

AMATEUR ROBOTICS NOTEBOOK - Robert Nansel
The challenge of allocating I/O bits with Breadbot.

OPEN CHANNEL - Joe Carr
Notes on vibration detectors and seismographs — Part 1.

STAMP APPLICATIONS - Lon Glazner
WWVB Clock Interface: Making use of the National Institute of Standards and Technology radio station.

COMPUTER-CONTROLLED WORLD - Ryan Sheldon
Vacuum Florescent (VF) Displays. One of the finest display technologies available is now easy to use with any device capable of sending RS-232 characters.