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  Volume 3 - Issue 15 - 8/11/03
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Connect To These Topics In This Issue:


   Spotlight On...
   – QuadTech, Inc.

   – Transtector Systems,
  Access Points
  Hook-Up Wires
  Industrial Containers
  RF Receivers
  Roller Bearings
  Ameripack Corporation

  Technical Library Spotlight:
   "Coupling Effects Between
   Lumped Elements"
  Take A Break With "The
  RAM Manufacturing Company
  Scientific Technologies, Inc.
  New Product Categories
   on GlobalSpec
  New Supplier Catalogs
   on GlobalSpec
  The Survey Results Are In
  GlobalSpec Featured Products

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of technical products and services!

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Spotlight On...

LCR App Note CollectionComplimentary LCR Application Note Collection

QuadTech, Inc. is pleased to announce their NEW complimentary LCR Application Note Collection. The collection is a compilation of QuadTech's most popular LCR application notes in one convenient PDF file. This "mini-library" provides a basic overview of all impedance parameters including symbols, definitions and equations. Mathematical theory, measurement circuits, application techniques and measurement accuracy are topics addressed in this handy reference guide.

Want to delve into analog bridge configurations? What about a study of inductor properties or a discussion of the ESR of capacitors? You'll find these and other interesting topics in The LCR Collection. Download a copy today by clicking here!

Click here to browse QuadTech's online catalog. Or contact them via e-mail for more information.

Reducing Damage, Downtime and Errors

DRDC Series from Transtector SystemsTranstector Systems designs and manufactures advanced suppression and power quality equipment. Transtector pioneered silicon suppression and continually develops solutions to protect against damage and error due to lightning and transients. Newer products include:

  • DRDC Series (1452-012) – Ultra-compact, silicon DC power protection (7, 12, 24 and 48V) popular for PLCs, I/O inputs and RS485/422 networks
  • I2R Storm (1451-030) - Compact, DIN mount silicon suppression for 120/240 Volt AC power
  • ALPU Series (1453-022) - Customized platform protects Ethernet and DC configurations for outdoor fixed wireless equipment and systems

Click here to view our online catalog or reach an e-mail link.

Looking for Access Points, Hook-Up Wires, Industrial Containers, Instrumentation Amplifiers, RF Receivers or Roller Bearings?

Find them on GlobalSpec!

  Access Points

Access points are transmitter / receivers (transceivers) that connect to a network through an interface such as a bus or connector. They receive, store, and transmit data between the wireless LAN and the wired structure. End-users access the WLAN through wireless LAN adapters, similarly equipped with transmit-receive capabilities.

Access points are implemented as computer cards connected to the wired network through a bus, or as standalone modules connected to the wired network by mean of a suitable interface. Internal access points are computer cards that are attached to the computer through a slot. They are implemented, among others, as PCI, ISA, or PC cards (PCMCIA) in desktop computers, in notebook or palmtop computers, or integrated within hand-held computers. External access points are modules that connect to the system by means of a physical port. You will find contact information for 28 manufacturers in this category.
Click here to search for Access Points by Spec.

  Hook-Up Wires

Insulated wire used for low current, low voltage (under 1000V) applications internally within enclosed electronic equipment. You will find contact information for 115 manufacturers in this category.
Click here to search for Hook-Up Wires by Spec.

  Industrial Containers

Containers for material handling, shipping and storage, including basins, bins, boxes, buckets, crates, cylinders, drums, IBCs, tanks, and ISO containers. You will find contact information for 161 manufacturers in this category.
Click here to search for Industrial Containers by Spec.

  Instrumentation Amplifiers

An instrumentation amplifier is a differential amplifier that has been optimized for use with DC signals. They are typically characterized by high gain, high CMRR, and high input impedance. You will find contact information for 66 manufacturers in this category.
Click here to search for Instrumentation Amplifiers by Spec.

  RF Receivers

Receivers are electronic devices that enable a particular radio signal to be separated from all others being received and converted into a format for video, voice, or data. RF receivers can be integrated circuits (IC) to desk top devices. You will find contact information for 95 manufacturers in this category.
Click here to search for RF Receivers by Spec.

  Roller Bearings

Roller bearings are used in rotary applications to replace sliding movement with low friction, rolling motion. The principal types of roller bearings are cylindrical, spherical, and tapered. In general, roller bearings offer higher load capacities than ball bearings of the same size. You will find contact information for 80 manufacturers in this category.
Click here to search for Roller Bearings by Spec.

Ameripack Corporation

Visit Ameripack Corp.Standard and Custom Cases Engineered For Your Demanding Needs

Ameripack Corporation is a manufacturer-distributor of carrying, shipping, rack-mount, rotational molded and panel-mount cases. Their injection-molded cases are airtight, watertight, crushproof, dustproof and meet or exceed ATA and military specifications. Ameripack offers a full line of watertight, high-intensity Xenon safety lights and PDA cases. Applications include:

  • Military & Aerospace
  • Telecommunications
  • Test Equipment
  • Instrumentation
  • Broadcast/Audio Visual
  • Laboratory
  • Marine
  • Fire, Police & Rescue
  • Utility/Industrial
  • OEM and Design
  • Computer
  • Medical

See us at the Safety Show in Chicago in September and the ISA Show in Houston in October. Click here to browse Ameripack's online catalog or contact them via e-mail for a quotation or more information.


Technical Library Spotlight: "Coupling Effects Between Lumped Elements"

Visit the RF, Microwave and Wireless Components section of GlobalSpec's Technical Library for articles and application notes regarding components such as amplifiers, receivers, and modulators, which are designed to operate in the range of the electromagnetic spectrum reserved for microwave or wireless communications.

In this section you will find, "Coupling Effects Between Lumped Elements," an application note submitted by M/A-COM, Inc.

"Low cost RF and microwave components mandate a higher level of integration and more circuit functions in a smaller package. In other words, one needs to integrate RF/microwave circuits in a compact package to lower the volume and cost. Lumped inductors are commonly used due to their smaller size, lower parasitic effects, larger bandwidths, and large impedance transformation capability. When such components are placed in close proximity to each other, a fraction of the power present on the main component is couples to the secondary element. The power coupled is a function of the physical dimensions of the structure, mode of propagation (TEM transverse electromagnetic or non-TEM), the frequency of operation, and the direction of propagation of the primary power. In these structures, there is a continuous coupling between the electromagnetic fields of the two components known as parasitic coupling."

Click here to read "Coupling Effects Between Lumped Elements" in its entirety.

The Challenge - The Spinning Gizmo...

The situation presented in the last edition of the newsletter was: We have a gizmo that looks like a slender rock, is somewhat elliptically shaped, and has a flat top. This gizmo has a "preferred direction of spinning" - if you tap it, it will begin to spin in one direction. If you manually spin it in its preferred direction, it happily spins for a while. However, if you spin it in the opposite direction, it will shudder, come to a stop and then start spinning again, but in the preferred direction. What is this gizmo?

Answer: This "gizmo" is known by a few different names: Rattleback, Celt or Wobblestone. And, as some of you have informed us, they have also been referred to as "space pets" (hmmm… bet the vet bills for this type of pet are much lower!).

The Rattleback prefers to spin in a counterclockwise direction. Its spinning preference is due to its offset center of gravity. If forced to spin in a clockwise direction, it will turn for a few revolutions, stop, oscillate and then begin spinning in counterclockwise. (Very stubborn, indeed!) Visit the following URLs for in-depth information and diagrams:

Here's a sample of the e-mail we received.

"The object you are describing is a Rattleback. The shape of the Rattleback is what's critical. While the bottom longitudinal curve is elliptical and symmetrical, the lateral bottom curve is not symmetrical with the maximum draft lying on a diagonal. As the Rattleback rocks side to side along a lateral axis the point of contact shifts side to side along the line of maximum draft. The off center point of contact induces a rotation around the longitudinal axis. This rolling motion, in concert with friction, creates a torque about a vertical axis which eventually reverses the rotation of the Rattleback. I love to play with these in front of other engineers."

"It is called a Rattleback. I think the surface of the curvature rubbing against the table top causes a 'rattling' motion. This rattling motion creates a motion in a preferred direction."

"This gizmo is called a Space Pet. It is available from Edmund Scientific's catalog and online."

"The object is commonly called a Rattleback (other names Wobblestone and Celt). There was a flurry of (renewed) interest in these in the 80s but they have been known for many years – try semi-rounded stones from a riverbed and you will find one sooner or later. The class of objects can be described as those which have a center of mass outside their axis of rotation – alternatively their principal axis of inertia precedes the direction of curvature at the point of contact – which is all very well but it is far easier to watch one in action than to describe how it works."

"It is called a Rattleback. Although I am sure there is a multitude of mathematical analyses, the simple answer is that the ellipsoid bottom has been deformed, like the twist on a two-bladed propeller. Imagine a propeller lying on the table. If you spin it one way the blades gently scrape along the surface. If you spin it the other way, the blades try to 'dig into' the surface, stopping its rotation. If jostled, the digging actions of the blades tend to initiate rotation away from the edges."

"A Rattleback is a half-ellipsoid object carved in a unique way that it's only able to spin in one direction. When spun in an unstable direction, friction causes it to slow and begin to oscillate, or rock up and down."

The Rattlebacks will be mailed out in a few weeks so if you haven't already sent in your name and address but would like to receive one, let us know! (You can use the same e-mail address as listed for submitting ideas for future challenge questions.)

New Question: It's a hot afternoon, you've just finished mowing the lawn and are in need of a nice, cold beer. Prior to starting your yard work, you put the beer in the freezer so it would be very cold - and refreshing - when you were ready to drink it. You take the beer from the freezer and it is indeed very cold (but not frozen). But before drinking it, you add a little lime juice. All of a sudden, ice crystals form and work their way down through the beer. What happened?

"The Challenge" is presented for a little fun. If you have a teaser that you'd like to submit, please e-mail the question and answer to: (The more difficult the challenge, the better!)

Your Design Solution for Solenoids and Valves

RAM Manufacturing Company is an industry leader in the design and manufacture of solenoids and valves. Now in our twenty-eighth year of business, RAM has products on many systems and in every environment.

Experience our never-ending commitment to quality and customer satisfaction! We're "Your Design Solution!"

Click here to contact us via our Web site.

Machine Safeguarding Guide Includes Free CD-ROM Version

Scientific Technologies, Inc. (STI) introduces their free 2003 Machine and Process Safeguarding Guide. This 650+ page guide is the most comprehensive machine and process safety product and technical reference guide available today. It includes 100+ pages of educational resource material, and features nearly 30 new products across a broad spectrum of safety technologies. The guide also comes in a CD-ROM version that contains the complete STI catalog, as well as Product Certificates and Declarations of Conformity and downloadable CAD drawings.

Click here to request a copy of the Machine Safeguarding Guide.

New Product Categories On GlobalSpec
These SpecSearchable product categories were recently added
to the GlobalSpec site.
  • Ceramic Manufacturing Services – services for parts and assemblies made of ceramic or refractory materials.

  • Condensate Pumps – used to collect and transport condensate back into a steam system for reheating and reuse, or to remove unwanted condensate from an HVAC or appliance collection pan.

  • Refractory Services – services for manufacturing, installing and repairing refractory shapes or monolithic refractories.
  • Scan Converters – transform computer-video signals into signals that are compatible with television.
Listed below are the SpecSearchable manufacturers recently added to the
GlobalSpec site,including links to their online catalogs.
A - E (New Suppliers)
F - L (New Suppliers)
M - Z (New Suppliers)

The Survey Results Are In...

The June 30th issue of the newsletter included a survey to capture your opinions regarding the economy and its impact on your company and the industry in general.

The results indicate, as expected, 2003 has been a challenging year for almost everyone. On a positive note, though, companies are taking fewer cost-cutting measures compared to last year and are expecting to finish 2003 in a strong position.

Click here for some key highlights and a sample of your comments.

GlobalSpec Featured Products Spotlight

Here are the products showing in GlobalSpec's Featured Products Spotlight during the month of August:

  DSP-5000DSP-5000 Fiber Optic Gyro
   (KVH Industries, Inc.)

The new DSP-5000 represents a breakthrough in low-cost fiber optic gyro (FOG) design. More info...

  eXpert 1000-12eXpert 1000-12 - 1KN Universal Testing Machine
   (ADMET, Inc.)

The expert 1000-12 is a bold new approach to low force testing at an affordable price. More info...

  TS5440 Adjustable Needle ValveTS5440 Adjustable Needle Valve
   (Techcon Systems, Inc.)

Adjustable needle valve provides high-precision dispensing and consistent dot sizes down to 0.5 microliter... More info...

  UFT14 Float Steam TrapUFT14 Sealed Stainless Steel Float Steam Trap
   (Spirax Sarco, Inc.)

The Spirax Sarco UFT14 Float Steam Trap helps reduce process steam system downtime and maintenance / installation burdens. More info...

"Determine that the thing can and shall be done, and then we shall find the way."
– Abraham Lincoln

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