ARTICLES

SECURITY ELECTRONICS SYSTEMS AND CIRCUITS — PART 3 - Ray Marston
Contact-operated security circuits are covered in the third installment of this ongoing series.

FUZZY LOGIC - Jeff Stefan
This article explains how fuzzy logic works, and provides you with a simple program so you can experiment with fuzzy logic systems of your own.

BUILD A “SUPER” ETCHING TANK - Larry Ball
Etch boards faster and conserve etchant with this innovative tank design.

PASSIVE INFRARED VARMINT CHASER - Kenton Chun (PDF File 380kb)
Try this humane way of deterring “unwelcome visitors.”

COPPER FOIL GROUNDING FOR RADIO FREQUENCIES - Gordon West
For a powerful marine and ham single-sideband transmission — and improved reception — good grounding techniques at the radio and automatic antenna tuner are extremely important.

CHARACTER LCD NETWORKABILITY - Ryan Sheldon
Control up to 16 character LCD displays of any size using only two wires from the RS-232 port of your computer.

BUILD QUICK HENRY TO MEASURE INDUCTANCE - Fred Blechman
Construct this simple adapter for use with your audio or RF signal generator to measure inductance values from one microhenry to over one henry.

COLUMNS

AMATEUR ROBOTICS - Karl Lunt
A “necessary” diversion from the Fire-Fighting robot — hacking the GameBoy, plus a very “timely” project.

OPEN CHANNEL - Joe Carr
What they didn’t teach you ... if they ever even knew! Find out why theory and practicality don’t always mix when it comes to electronics.

RESOURCE BIN - Don Lancaster
Shattering a few virtual reality illusions.

STAMP APPLICATIONS - Jon Williams
Getting back to the BS1.

SOFTWARE WIZARDRY - Harry Helms
Webcasting: Learn how to implement it on your web site.