Tag Archives: electronic components

Wired or wireless or both: What is best for small businesses?

Whether you are updating your office’s networking component needs or starting from scratch, there are many things to think about when you are considering wired vs wireless. For starters, ask yourself:

  • How many people are on your network? How about in 2 years?
  • How long will this system be in place? (any moves planned within 2 years?)
  • How fast does the network/internet access need to be right now? How about in 2 years?
  • What kind of files have to be moved across your network right now? How about in 2 years?
  • How fast does this need to be done?
  • Is this a temporary or permanent solution?
  • What is your budget?

Wiring a space can be cost prohibitive – especially if this space is temporary, but if the budget is unlimited, then hard wiring could be the way to go for speed and security. Very often a combination of both wired and wireless are the best solution.

 

What is a MOS-FET?

Mos-FETMOS-FET, which is an abbreviation of Metal-Oxide-Semiconductor Field Effect Transistor, is a very important kind of transistor. Many IC’s are constructed of arrays of MOS-FETS on a tiny sliver of silicon.

They are very small, easy to manufacture and many MOS-FETS consume a small amount of power making them an excellent choice for many applications.

It is the most common type of transistor available for either digital or analog circuits, replacing the bipolar transistor which was much more common in the past.

The word ‘metal’ in the name is actually now a misnomer because what was originally the gate material (often Aluminum) is now more often a layer of polysilicon (aka polycrystalline silicon).

Make a 9V headlamp head flashlight

Here’s an easy project that simple enough for electronic beginners, plus the supplies required are probably laying around your house or workshop.

Could you buy the same thing for just a few dollars more? Sure you could, but you’d miss out on the satisfaction of assembling this project all by yourself.

Here’s what you need:
2 high intensity white LEDS (you can use other colors if desired)
small perf board
2 470 ohm resistors
toggle switch or slide switch
9V battery snap
9V battery
small project box (you can use an Altoid tin)
electrical wire (about 2′ total)
soldering iron
solder
hot glue
electrical tape

For full assembly instructions, you can view the pages here:
http://www.instructables.com/id/9-Volt-Headlamp/

Book for electronics beginners

If you are new to electronics and want a good book to learn about circuits and electronic components, then I recommend that you check out this book:

Getting Started in Electronics by Forrest M Mims III

I’ve had my copy so long that it is almost time to replace it but even though it is an old, worn out copy, the information is still as good today as it was 15 years ago when I got my book. Of course, there are some things that won’t be found in here, but for the beginner, you can’t go wrong with this book.

The chapters are logically laid out and easy to read and each chapter builds on the previous lessons. I would recommend this book for anyone who wants to learn about electronics – from child to adult.

Introduction to electronics

Introduction to electronics

What causes oxidation on surface mount pads?

perf boardSolder contacts must meet minimum contact rating specifications to effectively be used. But sometimes you’ll begin to solder an electronic component to a board and realize that oxidation has occurred. Why does this happen?

Typically, there are two reasons that oxidation occurs on boards.

The main reason is improper storage and handling. Boards should be received from your supplier in a vacuum pack, which would render them clean and ready to accept solder. Once the vacuum seal has been broken, the boards are exposed to the environment. Boards that are stored in facilities with high humidity will experience accelerated deterioration. When handling boards, use only gloved hands and handle by the edges whenever possible.

Another way PCBs become contaminated is at the factory level. If your boards have just been removed from their packaging, chances are the problem is not oxidation. Much of the contamination is at the manufacturing level which is found after the bag has been opened. The main reasons this happens is because of incorrect ph levels, careless handling of the PCBs or if the boards are poorly washed with the surface film.

How can this be avoided? Handle the boards properly including using proper storage methods. Keep the boards in dry storage area, free from humidity. Make sure that anyone that handles them wears gloves to keep body oils from the pads and instruct everyone to touch only the edges of the boards. If your problems are from the factory, address the factory about the issues to avoid the same problems with future orders.

Make an inexpensive & simple UV LED Torch

UV LEDFrom our friends at instructables comes an easy project for use with UV LEDS.

To make this simple project, here’s what you’ll need:
2 Ultra Violet LEDS
1 1/4W resistors (the value of the resistor needs to be calculated based on the forward voltage of the LED you use)
1 non-working 9V battery (or a 9V battery clip)
1 new 9V battery
Pliers
Solder
Soldering equipment

The full instructions on the Instructables site will show you how to put everything together. Once assembled, the light snaps on to a working 9V battery to function.

Keep in mind, you don’t have to use UV LEDS for this project – you can use any color. Just adjust the resistor required based on the forward voltage and forward current of the LEDS you choose.

Buying LEDS without specs or you don’t remember the specs of the ones you have sitting around? Assume a max of 2.8V – 3V and 20mA. I would think high intensity white LEDS would work really well for this project.

I haven’t put this one together myself yet, but I think a few of these are coming with me on my next camping trip. Nice way to light up the tent and the ‘facilities’ late at night. Fun project – and you probably already have everything you need right on hand.

More Allen Bradley carbon comp resistors now available!

We’ve updated our resistor inventory and added many more NOS Allen Bradley carbon comp resistors. Between the 1W values and 2W values, we now have over 150 different 1W and 2W carbon comp resistors on hand!

Included in the selection are many Military (MIL-SPEC) Allen Bradley carbon comp resistors. The military resistors typically have a tighter tolerance than the standard resistors.

Allen Bradley carbon comp resistors are valued for their consistency and uniformity. The Allen Bradley corporation reference materials have this to say about their hot molded resistors:

Years of accumulated experience have shown that Allen Bradley hot molded resistors are unequaled for uniformity, predictable for performance, appearance, and freedom from catastrophic failure. Allen Bradley resistors are made by an exclusive hot molding process on automatic machines developed, built, and used only by Allen Bradley. There is such complete uniformity from one resistor to the next, million after million, and long term in-circuit performance can be predicted with usable accuracy. When used according to published ratings and recommendations, Allen Bradley hot molded fixed resistors will not open circuit nor exhibit erratic changes of resistance value. They are probably the most reliable of all electronic components.

We get frequent requests for other values so we were thrilled to get more for our stock! Quantities are limited – especially on the MIL-SPEC resistors.

RoHS: Will the electronic component industry be shaken again?

The RoHS directives may get a some revisions from the European Union principals that have put the directives into place. Some of the expected changes will come in the form of exclusions that were formerly allowed and additional banned substances. The EU’s Environment Committee and the Council of Ministers is expected to decide within the next 12 months what changes are made and the timetable for them to be put into place.

What does this mean to end users of electronic components? For now, not much – but expect to see changes in the way that RoHS compliant products are labeled in the future. One potential change would expand the use of the European mark of conformity (CE) to include RoHS compliant products. This one change would force the entire industry to adjust the markings on all components manufactured after the date required by the EU.

Many wonder why the directives that have been passed in the EU effect all components manufactured across the globe. The key reason is financial. It is easier to comply with the progressive EU requirements than to produce different versions of components for each region. It is also easier to produce one component for world-wide use than more than one for each region. Another reason is that while other regions have not passed their own RoHS initiatives, the consensus is that what is good for the EU is good enough for the rest of the world.

Now we wait for their decision.

Rubber Feet : features and applications

Rubber feet have many different features and applications for the home, the workshop or in the manufacturing process. Here are some common features of the rubber bumpers that West Florida Components has on hand:

  • low abrasion
  • superb skid resistance
  • easy to apply – just peel and stick
  • does not stain or mar
  • can absorb shocks and vibrations
  • crack resistant
  • is recognized by UL

You can use adhesive rubber feet in many different applications. Some of the most common are:

Sound dampening and spacers for cabinet doors, drawers and lids

For those purposes, these are some of the suggested self-adhesive rubber bumpers to use:

Medium clear cylindrical (round) rubber feet

Small clear cylindrical rubber feet

Medium black hemispherical rubber feet

Small black hemispherical rubber feet

Small clear hemispherical rubber feet

As feet on the bottom of household appliances, office equipment, telephones, scales, clocks, speakers, computers, and other devices

Medium black cylindrical (round) rubber feet

Medium clear hemispherical rubber feet

Large black hemispherical rubber feet

Medium clear square rubber feet

For the back of picture frames and hung mirrors

Medium clear square rubber feet

Medium black square rubber feet

Large black square rubber feet

Turn your old PC fans into mini wind generators

pc fanHere’s a great project that you can do either to experiment with wind turbines or to generate some energy! While the amount of energy produced is not overwhelming, this project can sure get your brain moving in the right direction.

The best thing about this project is that you probably already have everything you need lying around:

  • Thick plastic bottle
  • Old PC fan, bigger the better!
  • A few feet of small wire
  • A piece of wood about 1.5″ square and around 20cm long
  • Two lengths of steel tubing that slide inside of each other, about 1/2″
  • 6 Schottkey diodes
  • Epoxy
  • Super Glue
  • Zip ties
  • An old CD

You can find the full instructions including video here: http://www.instructables.com/id/Upcycle-your-old-PC-fans-into-mini-wind-generators/

If you want to have a kid-friendly wind turbine kit that already has all the pieces you need, we sell one of those. Our kits come with full instructions and all the materials needed to try your hand at creating a source of renewable energy – a wind turbine. The kit also comes with different experiments you can try with your wind turbine once it’s assembled. Great project for summer for the kids!