ARTICLES
LATE-BREAKING NEWS: YOUR GPS EQUIPMENT NOW HAS BETTER ACCURACY - Gordon West
At midnight on May 2nd, the Defense Department pulled the plug on selective availability. What does this mean to civilian GPS users? Perhaps not the “pinpoint” or “spot-on” accuracy you might think ...
A PC-BOARD CUTTING JIG FOR THE DREMEL TOOL - Steve Daniels
Always finding new uses for your dremel tool and its accessories? How about using it for cutting PC boards accurately, simply, and inexpensively? This article will explain how the idea for an innovative accessory came about, how to built it, and how to use.
FET PRINCIPLES AND CIRCUITS — (PART 2) - Ray Marston
We continue this month with a look at some practical JFET circuits, their basic usage, and applications.
ANOTHER AC-DC VOLTAGE REFERENCE - Ron Tipton
Back in January, Ron described an improved AC-DC voltage reference. This month, he shows us his latest design that produces the output reference voltage directly, so a switched divider isn’t needed at all.
OLD SCOPES DON’T NEED TO DIE — A REPAIR STORY - Fred Blechman
Many electronics bargains can be found today at swap meets, hamfests, and in the pages of this magazine. But what if they don’t work? Take a fictional trip to “Bob’s repair shop” and get some factual, basic troubleshooting techniques along the way.
MODULAR INSTRUMENT SYSTEM: A METHOD FOR POWER WITHOUT ZILLIONS OF BATTERIES - James Lyman
When testing or researching projects, small, custom instruments always pose a problem for powering them, a question of either using batteries or building a complete AC power supply which often can be larger and heavier than the instrument itself. This article describes a powering system which features a standardized power supply that is quickly and easily connected to small instruments.
BUILD A SHADED POLE AC MOTOR - Richard Panosh
Intrigued by electric motors? Build this shaded pole model which makes an excellent display of the early Fleming-Thomson motor and also is excellent as a science project. Plus, enjoy a history tour in the process.
COLUMNS
AMATEUR ROBOTICS NOTEBOOK - Robert Nansel
Coverage of the Seventh Trinity Firefighting Home Robot Contest, plus beginnings of a new robot.
ELECTRONICS Q & A - TJ Byers
OPEN CHANNEL - Joe Carr
Noise Cancellation Techniques. Noise is bad, and getting rid of noise battering a signal is a major chore. Try out the “invert and obliterate” method described here to overcome your own “signal sabatoge.”
STAMP APPLICATIONS - Jon Williams
Menus Made Easy. Apply a great UI design to the BASIC Stamp, creating a platform from which any number of distinct control projects can be developed.
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