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N&V November 2006

N&V November 2006
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Product ID : SKU16211

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Features

  • Square Root On A PIC by Noel Henson
    Square roots have been in use for thousands of years in construction and astronomy. Today, they are also used for computing RMS values, FFTs, and other types of digital filtering, navigation, and more. With more and more smarts being put into smaller and smaller devices, there is greater need to run a square root function on a small, low-power MCU. Typical methods for computing square roots are slow and difficult to implement on a small MCU. They require multiply and divide functions ...
  • The Is 100 Years Old This Year by Vaughn D. Martin
    This year marks the 100th anniversary of Lee de Forest’s Audion or first vacuum tube triode (Figure 1). This was the most famous of de Forest’s 180 patented inventions. This vast improvement upon John Ambrose Fleming’s valve changed the world like few other events since. The “valve” was a vacuum tube diode that Fleming invented as a modification to an Edison light bulb by adding a second element to it ...
  • Making Something From Nothing by H. Ward Silver
    In the beginning there was only noise, but humans have learned to make their own electromagnetic crackles and pops with a device that is as much as possible ... empty! Radio and vacuum tubes grew up together from their genesis a century ago, but their history was not a clean, step-by-step process. Theory and experiment took turns leapfrogging each other, mixing sudden discoveries and steady refinements. Their story begins in the Age of Steam ...
  • David Sarnoff And The Birth Of The AM Radio by Edward B. Driscoll, Jr.
    It is nearly impossible to imagine that it was less than 60 years ago, in 1939, when David Sarnoff told a crowd of curious viewers, “Now we add sight to sound.” Sarnoff went on to say, “It is with a feeling of humbleness that I come to this moment of announcing the birth in this country of a new art so important in its implications that it is bound to affect all society. It is an art which shines like a torch of hope in the troubled world. It is a creative force which we must learn to utilize ...
  • Vacuum Tube In Its 100th Year by George Trinkaus
    The engineering challenges of the hot cathode vacuum tube — an invention dated 1906 — are the same today as they were then. The inventing of new, more compact and efficient vacuum-tube designs proliferated madly up until the 1950s, but the art has been frozen ever since. Before Fleming’s diode and de Forest’s triode Audion, inventors like Crookes, Tesla, and Roentgen had experimented with the magical effects of high voltage in vacuum ...
  • The Antique Wireless Museum by Terry Turner
    For anyone interested in electronics, its history, and development, a trip to the Antique Wireless Association Museum is a must. The museum is located in the small and picturesque town of Bloomfield, NY and features some of the most unusual and rare exhibits of wireless, telegraph, radio, and television ever assembled. The museum is one of the few devoted to research, preservation, and documentation of the history of wireless communications ...

Projects

  • Restoring The Philco PT-44 Antique Radio by Aaron Dahlen
    This article chronicles the restoration of a 1941 Philco model PT-44 vacuum tube radio shown in Photo 1. As I worked on this radio, I often found myself wondering who owned it. What did they listen to? Did this radio deliver the original radio broadcast of President Roosevelt’s address to Congress, “Yesterday, 7 December 1941 — a date which will live in infamy” ...
  • An Electronic Slide Rule by Robert Lang
    In 10 years, your computer will be in the landfill, but your slide rule will be operating just as fast as it did in 1700. As an engineer from the 1970s, I have a nostalgic place in my heart for those pre-electronic computer mechanical calculators ...
  • Stand-Alone DDS Unit by Larry Cicchinelli
    Direct Digital Synthesis (DDS) is one of the more prevalent methods used to generate a frequency agile signal today ...

Columns

  • Near Space by L. Paul Verhage
    The Balloonsat Flight Computer
    Last year, I wrote a column about my improvements to the BalloonSat airframe. So this month, I want to discuss my improvements to the avionics ...
  • Getting Started With PICS by Chuck Hellebuyck
    PIC Hardware Interface
    Programming Microchip’s PICs is a lot of fun, especially if you have a nice development board with all the connections pre-wired for you. My BasicBoard, built around the 40 pin Atom chip (16F877A with Atom bootloader installed), was designed just for that purpose. A beginner could get a lot of programming in before they ever have to build custom circuitry around their PIC micro-controller. What I’ve found from reader feedback is a lot of people are looking for a little guidance ...
  • Personal Robotics by Phil Davis, Ken Tait
    The Saga Of The Silver Bomber — Part 2
    In Part 1 of this article (two months ago), we explored how finding some surplus Silver Bombers led to the development of a controller for the motors they contained. We explained what would be required to run various motors of this size and came up with a practical design ...
  • Q&A by TJ Byers
    Reader Questions Answered Here
    In this column, I answer questions about all aspects of electronics, including computer hardware, software, circuits, electronic theory, troubleshooting, and anything else of interest to the hobbyist.
  • Techknowledgey by Jeff Eckert
    Techknowledgey 2006
    Events, Advances, and News.
  • The Design Cycle by Peter Best
    “Discover"ing DHCP Messages
    I’ll bet that many of you took my advice to heart and read through the DHCP RFC documents. If you did, you now know that there are mountains of rules and recommended procedures for implementing DHCP. The good news is that I’ve sifted through all of that stuff and gleaned only the essential DHCP stuff we’ll need to allow a microcontroller to play in DHCP land. The information that I milked out of the DHCP RFC documents will be used to form the basis of our DHCP source code, which we will ...
  • Stamp Applications by Jon Williams
    Hacking The Parallax GPS Module
    In September, we talked about exciting new updates in the SX/B compiler and now we’re going to put a few of them to use with a cool new GPS product from Parallax. This isn’t just another GPS module. It was specifically designed to be hacker-friendly. How? Well, it uses an SX20 and the firmware was written in SX/B — and you can download this code from Parallax. Better still, is the addition of several nondescript pads on the PDB ...

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