ARTICLES
HOLIDAY PROJECT:
HOLIDAY LIGHTING DIMMER - James A. Cart
With the holidays fast approaching, lighting displays will soon be appearing across the country. Make your display unique with this dimming display controller that gives you more than just the usual on/off blinking options.
SWITCHED-CAPACITOR FILTERS - Anton Kruger
A surprising number of people are unaware of switched-capacitor filters, even though they have been around for years. These filters offer ingenious designs, they’re easy to work with, and are very cost-effective.
MORE CHANGES FOR THE HAM CODE TEST - Gordon West
Review what the 5 wpm code “restructuring” has done for amateur radio so far, plus find out about some new code guidelines.
RS-232 ON A BREADBOARD - Al Williams
Discover a handy board that converts RS-232 to TTL and plugs directly into a solderless breadboard. It has a lot of applications including BASIC Stamps and experimenting with the PC serial port. Plus, the construction technique is a nice way to make little modules that you can plug into a breadboard.
BUILDING ELECTRONIC KITS - Fred Blechman
Why build a kit? Do you need to know anything about electronics? Will you save time or money? Are they hard to build? Where can you get these kits? Everything you want to know about kit building, but were afraid to ask ...
‘555’ MONOSTABLE CIRCUITS - Ray Marston
Learn 555 basics and discover ways of using the IC in several different monostable applications such as a pulse generator, analog meter driver, event-failure alarm, an automatic delayed-turn-off headlight control for cars, and an automatic porch light.
A DATA TRANSPONDER FOR MODEL ROCKET ENGINE DEVELOPMENT - Bob Vun Kannon
When developing rocket engines from scratch, there is a positive, non-zero probability of an explosion on any given firing. Thus, a device to gather data from the tests which allows you to be elsewhere is highly useful. Meet the Data Transponder ...
USB QUICK START: USING THE UNIVERSAL SERIAL BUS - Jan Axelson
Learn a nifty way to use USB to monitor and control digital signals from a PC with a handy, small PC board called the USBSimm.
HOLIDAY PROJECT:
BUILD THE INCREDIBLE CHRISTMAS TREE DIPSTICK! - Russ Shumaker
Tired of having to lay across piles of packages while trying to pour water into a hidden tree holder only to discover (the hard way) it didn’t really need water after all? Your problem is solved!!
COLUMNS
AMATEUR ROBOTICS NOTEBOOK - Robert Nansel
The theory behind robotic drive systems.
ELECTRONICS Q & A - TJ Byers
Whistlers primer, active filters, and how they relate to long lengths of wire. A unique relay-operated well pump and garage watchdog. Reader’s feedback with old radio and RIAA trivia, and a more serious side of etching PC boards. Finally, some nifty freebies.
OPEN CHANNEL - Joe Carr
Calculating Radio Antenna Bearings: The Great Circle
If you use a directional antenna in your radio work, then it might be nice to know the direction in which to point the thing.
STAMP APPLICATIONS - Jon Williams
Look Mom, No Chips
The Stamp’s FREQOUT command is capable of some pretty amazing sound effects. Plus, it doesn’t require any external components!
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