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ARTICLES

BUILD A POCKET-SIZED DIGITAL ALTIMETER - Anthony Caristi
For those who like to drive or hike up mountain roads or trails, this easy-to-build pneumatically-operated electronic altimeter is just what you are looking for.

SEQUENCING AND DIMMING - ADD SOME PIZAZZ TO YOUR HOLIDAY LIGHTS - Eric Gunnerson   (PDF File 881kb)
This holiday lighting project utilizes the Motorola 68HC11 for making the season bright.

‘555’ ASTABLE CIRCUITS - Ray Marston
Find a variety of ways to use a 555 timer IC in several astable waveform generator circuits.

STARTING WITH THE 68HC11 - Al Williams
The 68HC11 is very popular, but hard to breadboard with because most varieties are in a PLCC package. However ... have you ever heard of the 68HC811E2CP2?

LOOPS INTRODUCE VHF/UHF WEAK SIGNAL OPERATION -  Gordon West
Using the right loop antenna can make a world of difference when trying to get contacts on VHF and UHF SSB.

DESIGNING A GENERAL-PURPOSE PROGRAMMING SYSTEM — PART 1 - Brian Beard
Meet the LP120: a general-purpose device programmer that not only incorporates basic functions — communication with a host, generating the programming-pulse voltage, generating any unique supply voltage required by the device, and controlling the digital interface to the device — but can work with Windows PCs, Macs, laptops, and desktops old and new.

OZTRIP CAR COMPUTER - Robert Priestly
Whether on land or sea, the OzTrip Computer can be used to display trip info on 27 functions of speed, fuel, time, and distance of your “vehicle.” It also includes a sprint timer which is ideal for timing a standing quarter mile, plus it can be used as a general-purpose data logger not even related to vehicles.

BUILD YOUR OWN VOICE RECOGNITION X-10 CONTROL SYSTEM - Dennis Shepard (PDF File 669kb)
Man as long sought convenience and versatility in remotely controlling his world. A very popular format for doing this is with the X-10 protocol. Voice recognition has now made it possible to control these X-10 modules with your own voice and, with the project discussed here, for just around $100.00.

COLUMNS

ELECTRONICS Q & A - TJ Byers
The response to TJ’s high-pass and notch filters in last month’s column was overwhelming, so this month he has added instruments and websites that take the concept one step further. Specifically, a sensitive AC voltmeter, sinewave generator, and three bipolar power supplies. There’s also a 3.3V switching supply and a coaxial “bias-tee” power supply.

OPEN CHANNEL - Joe Carr
Large Loop Antennas.
Large loop antennas offer gain over a dipole, and can be built on smaller-sized lots than a host of other antennas. They are easy to build and use.

STAMP APPLICATIONS - Jon Williams
There’s A New Stamp In Town.
Meet the BASIC Stamp IISX+ (BSP). It takes all the really good stuff of the BASIC Stamp IISX, makes it better, and adds some really great features.