July 1997 Issue Articles and Columns   Select Year and Month to View Other Issues

ARTICLES

USER'S GUIDE TO SPECIAL AUDIO PROCESSING - PART 3 - Ray Marston ICs
In this final installment, we look at two remote-controlled audio tone/volume ICs and the MF10C filter IC.

TWO SIMPLE ELECTRONIC SIRENS YOU CAN BUILD - Fred Blechman
Whether it's the Mad Blaster or the Wailing Siren, you'll be "alarmed" at the ease of construction and multitude of applications.

AN EXPERIMENTER'S CHEAP ANTENNA TUNER - Carl Motsinger
Gain a better understanding of antenna tuners by constructing a working model.

INSTALLING A MULTI-BAND HF MOBILE WHIP - Gordon West
Get the details for proper installation of an Outbacker whip antenna.

ELECTRIC FIELD PROXIMITY SENSOR - Russell J. Bik
Need a simple, non-mechanical device that can detect the presence of either a moving or stationary human body, through solid objects, from a distance of yards? Read on ...

TURING MACHINES - Jeff Stefan
The most powerful computer in the universe is actually the simplest. Take this "tour" and find out why.

PRINTER PORT OSCILLOSCOPE - Robert Davis
Part 1 of a three-part series on handy devices you plug in through your printer port.

ELECTRONIC STETHOSCOPE - FIND THAT NOISE! - Bill Stiles (PDF File 303kb)
Make trouble-shooting various systems a lot easier with this handy listening aid.

COLUMNS

AMATEUR ROBOTICS - Karl Lunt
The extremes of hobby robotics.

OPEN CHANNEL - Joe Carr
Optical sensors - and some books.

RESOURCE BIN - Don Lancaster
Useful tools for book-on-demand publishing.

STAMP APPLICATIONS - Scott Edwards
IC temperature sensors are accurate and flexible.