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BUILD A LOW-COST NI-CD/NI-MH BATTERY CHARGER - Fred Blechman
Based on the Velleman “Low Cost Battery Charger Kit,” this battery charger is for home and car use, and can be used to charge single rechargeable Ni-Cd and rechargeable Ni-MH batteries in AAA, AA, C, and D sizes.
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CLOSED LOOP FEEDBACK CONTROL - John M. Baxley
This project — which is perfect for a beginning roboteer — shows how to set up a simple programmable feedback loop motor control system using components that are inexpensive compared to encoder/servo pairs. Related Information
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INTERNET TELEPHONY 101 - Edward B. Driscoll, Jr.
The concept of Internet telephony has been around for almost as long as there’s been a world wide web, but has never taken off like other applications. However, several million people are currently using the web to make some of their calls, to other PC users and to people with regular phones. Want to join them?
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DESIGNING A GENERAL-PURPOSE PROGRAMMING SYSTEM — PART 2 - Brian Beard
This month, discover a specific programming-module that allows the LP120 to program PIC microcontrollers.
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PORTABLE HIGH-FREQUENCY SYSTEM UNDER TEST - Gordon West
One leading USA manufacturer of military, marine, aviation, and amateur radio equipment recognized the need for a relatively small and portable high-frequency transceiver, battery D-cell capable, covering all worldwide frequencies from 1.8MHz through 30MHz. Meet the SGC-2020.
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CYBER-STREET SURVIVAL — PART 1: GETTING STARTED - ML Shannon
Cyber-Street Survival is a six-part series about privacy and security for people new to the Internet. With the information here, you will be able to help prevent viruses, spammers, stalkers, and pesky salespeople from bothering you.
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USING VOLTAGE REFERENCE AND TEMPERATURE SENSOR ICs (PART 1) - Ray Marston
In this first installment of a four-part series, Ray shows you how to use various popular ‘voltage reference’ ICs.
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DC MOTOR SPEED CONTROLLER - Jon Varteresian
Have an application where you need to be able to control the speed of a motor through acceleration and deceleration without any jerking? Then this controller is for you! Related Information
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COLUMNS
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AMATEUR ROBOTICS NOTEBOOK - Robert Nansel
Machina Speculatrix, Brittle Robots, Nanotechnology, and Robot of the Month. |
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STAMP APPLICATIONS - Jon Williams
There’s A New Stamp In Town — Part 2.
Updates, pin polling (firmware interrupts), and how to use the 40-pin BS2p are covered this month.
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OPEN CHANNEL - Joe Carr
Fiber Optic Technology — Part 1.
Fiber optics is the latest in communications and instrument technology, at least as far as the “wiring” is concerned. This month, we take an opening look at this technology.
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ELECTRONICS Q & A - TJ Byers
Cascading LM3914 chips, more about CueCat, and printer port relay interface defined. Free software, microwave ovens, Win 98 shortcuts — and a reader solves a sticky problem. |
