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External Power Supplies

eiodotcom —  October 3, 2012 — Leave a comment

Today’s EIO post is on external power supplies.



External Power Supplies 101


External power supplies are devices that convert ac power from a wall outlet into lower voltage dc or ac power to be used directly by electronic circuits. External power supplies come in a separate physical enclosure than the end-use product, and usually provide power to the device directly through a separate cord and plug. External power supplies are used to power a variety of electronic devices, including: laptop computers, printers, cordless phones, cell phones, etc.


External power supplies are used both with equipment with no other source of power, and with battery-powered equipment, where the supply both charges the battery and powers the equipment when plugged in. One of the benefits of using an external, rather than internal power supply is it increases the portability of a device, by avoiding the need of internal power components. Use of an external power supply allows portability of battery-powered equipment without the added bulk of internal power components and makes it unnecessary to produce equipment for use only with a specified power source.


Benefits of Using an External Power Supply

Safety — External power adapters can free product designers from worrying about some safety issues. Much of this style of equipment uses only voltages low enough not to be a safety hazard internally, although the power supply must out of necessity use dangerous mains voltage. If an external power supply is used (usually via a power connector, often of coaxial type), the equipment need not be designed with concern for hazardous voltages inside the enclosure. This is particularly relevant for equipment with lightweight cases which may break and expose internal electrical parts.

Heat reduction — Heat reduces reliability and longevity of electronic components, and can cause sensitive circuits to become inaccurate or malfunction. A separate power supply removes a source of heat from the apparatus.

Electrical noise reduction — Because radiated electrical noise falls off with the square of the distance, it is to the manufacturer’s advantage to convert potentially noisy AC line power or automotive power to “clean”, filtered DC in an external adapter, at a safe distance from noise-sensitive circuitry.

Weight and size reduction — When most power adapters featured simple mains-frequency transformer-based designs, they were quite heavy and large, and added considerably to the weight and bulk of devices designed to be lightweight. Even modern power supplies are relatively heavy compared to other circuitry. Removing power components from equipment powered by rechargeable batteries reduces the weight and size which must be carried, though use of other rechargeable batteries like sealed lead-acid batteries can questionably put more weight on the equipment.

Ease of replacement — Power supplies are more prone to failure than other circuitry due to their exposure to power spikes and their internal generation of waste heat. External power supplies can be replaced quickly by a user without the need to have the powered device repaired.

Configuration versatility — Externally powered electronic products can be used with different power sources as needed (e.g. 120VAC, 240VAC, 12VDC, or external battery pack), for convenient use in the field, or when traveling.

Some of Our Products  (To see all power supply products, click here)





Brand Velleman
Supply Voltage 100 ~ 240V AC
Power 36W
Efficiency >=70%
Selectable Outputs 5 to 24V DC in steps of 1V (from 4.3 to 1.5A)
Output Plugs 2.5mm mono, 3.5mm mono, 1.0×3.0mm, 1.35×3.5mm, 1.7×4.0mm, 2.1×5.0mm, 2.5×5.5mm, 1.5×5.5mm
Dimensions 3.5″ x 1.8″ x 1.2″
  • with 8 detachable DC plugs
  • for notebook computers & personal digital electronic devices
  • stabilized output, low ripple & interference
  • short-circuit & overload protection
  • high efficiency & low energy consumption









This switch mode regulated power supply wall adapter comes with 4 input plugs to operate around the world. Includes input power plugs for the US, UK, Europe, Taiwan, and China! Additionally, choose from 7 different DC output connectors. Finally, a switching power supply adapter with a user selectable output plug size and polarity!

Get rid of those bulky power-hungry heat-producing linear power adapters. These switching power adaptors are state-of-the-art switch mode power supplies featuring major advantages such as:
– cooler running
– stabilized (regulated) output
– short-circuit and overload protection
– compact design
– very low idling power consumption
– multiple (selectable) voltage outputs
– user configurable output connector polarity: center (+)  or  center (-)
– world wide AC input voltage range


  • 4 AC input power plug configurations included (user selectable)
    • AC plugs to fit in US, UK, Europe, Taiwan and China
  • compact switch mode regulated power supply design is light-weight and efficient


  • AC input supply voltage: 100 ~ 240V AC, 50/60 Hz
  • output power: 24.0 watts max.
  • efficiency: > = 70%
  • user selectable output voltages:
    • 3V,  4.5V,  6V, 7.5V, 9V, and 12V DC
  • output current: 2,000ma (2 amps) maximum current consumption
  • 7 DC output connector plugs included (user selectable)
    • 2.5mm (male)
    • 3.5mm (male)
    • 2.35×0.75mm (female)
    • 3.5×1.35mm (female)
    • 4.0×1.7mm (female)
    • 5.0×2.1mm (female)
    • 5.5×2.5mm (female)
  • power supply dimensions: 4.6″ x 2.4″ x 3.3″  (11.6cm x 6.1cm x 8.3cm)







Brand Velleman
Supply Voltage 100 ~ 230V AC ± 15%
Power 10W
Efficiency > 80%
Output Voltages 3, 4.5, 6, 7.5, 9, 12V DC
Output Current 800mA (regulated) / 1.5A max.
Plugs 2.5mm mono, 3.5mm mono, 1.0×3.0mm, 1.35×3.5mm, 1.7×4.0mm, 2.1×5.0mm, 2.5×5.5mm, 1.5×5.5mm
Dimensions 2.6″ x 1.1″ x 2.9″
Weight 3.0 oz
Features Get rid of those bulky power-hungry heat-producing mains adapters.
These adaptors use state-of-the-art switching power supplies and feature some major advantages such as:
– cooler running
– stabilized output
– short-circuit and overload protection
– compact design
– very low idling consumption

Computer Cases 101

eiodotcom —  October 2, 2012 — Leave a comment

Today’s EIO post is an introduction to computer cases and their uses.


What Is A Computer Case?




A computer case (also known as a “computer chassis”, “cabinet”, “box”, “enclosure”, “housing”, or simply “case”) is the enclosure that contains most of the components of a computer (usually excluding the display, keyboard and mouse).  Cases are usually constructed from steel (often SECC — Steel, electrogalvanized, cold-rolled, coil) or aluminium. Plastic is sometimes used, and other materials such as wood and even Lego blocks have appeared in home-built cases.




Computer cases usually include sheet metal enclosures for a power supply unit and drive bays, as well as a rear panel that can accommodate peripheral connectors protruding from the motherboard and expansion slots. Most cases also have a power button or switch, a reset button, and LEDs to indicate power status as well as hard drive and network activity. Some cases include built-in I/O ports (such as USB and headphone ports) on the front of the case. Such a case will also include the wires needed to connect these ports, switches and indicators to the motherboard.


Hardware Access


Tower cases have either a single side panel which may be removed in order to access the internal components or a large cover that saddles the chassis. Traditionally, most computer cases required computer case screws to hold components and panels in place (i.e. motherboard, PSU, drives, and expansion cards). Recently  there is a trend toward “screwless” cases, in which components are held together with snap-in plastic rails, thumbscrews, and other methods that do not require tools; this facilitates quick assembly and modification of computer hardware.






APEVIA X-CRUISER-AL Silver Steel ATX Mid Tower Computer Case


ATX Mid Tower
Front Temp, Sound, Fan Speed Gauges
Front 2 x USB 2.0, 1 x Firewire, 2 x audio
Type ATX Mid Tower
Color Silver
Case Material Steel
Power Supply No
Power Supply Mounted Top
Motherboard Compatibility Standard ATX / Baby AT / Micro ATX
Main Board Size: Fits up to 11″ x 12″
With Side Panel Window Yes
External 5.25″ Drive Bays 4
External 3.5″ Drive Bays 2
Internal 3.5″ Drive Bays 4
Expansion Slots 7
Front Ports
Front/Top Ports 2 x USB 2.0, 1 x Firewire, 2 x audio
Cooling System
80mm Fans 2 x 80mm fan – front (optional)
1 x 80mm UV blue LED fan – top (included)
1 x 80mm UV blue LED fan – rear (included) upgradable to 120mm fan.
Side Air duct UV Air Duct and Filter on Side Window (Thermally Advantaged Chassis)
Physical Spec
Dimensions(L x W x H) 19.25″ x 7.75″ x 17.00″
Features Modern Sophisticated Stylish Design
Large See-through Side Window
1 x UV Air Duct and Filter on Side Window (Thermally Advantaged Chassis)
1 x Front Fan Gauge w/ Fan Controller (Controls up to 5 fans)
1 x Front Temperature Gauge with Blue Back Lighting
1 x Front Volume Gauge and Volume Controller
Front Panel LED Lights










APEVIA MX-PLEASURE-BK Steel ATX Full Tower Computer Case


ATX Full Tower
500W Power Supply
Front Panel 2 x USB2.0, 1 x Firewire
Type ATX Full Tower
Color Black
Case Material Steel
Power Supply 500W
Power Supply Mounted Top
Motherboard Compatibility Standard ATX / Baby AT / Micro ATX
With Side Panel Window Yes
External 5.25″ Drive Bays 4
External 3.5″ Drive Bays 2
Internal 3.5″ Drive Bays 7
Expansion Slots 7
Front Ports
Front Ports 2 x USB2.0, 1 x Firewire
Cooling System
80mm Fans 1 x 80mm UV blue LED fan – front
1 x 80mm UV blue fan – front
120mm Fans 1 x 120mm UV blue LED fan – side
1 x 120mm UV blue LED fan – rear
Physical Spec
Dimensions(L x W x H) 19.00″ x 8.00″ x 21.25″
Weight 31 lbs.
Features Fully loaded steel durable chassis
Ideal for small business, network server
Lockable side panel and front panel
Fold in/out case feet for case stability
Front temperature display gauge
Front fan speed controller and gauge









Sentey SS1-2421 Slim 2421 Slim Flex Case w/Power Supply LCD DISPLAY SECC 0.7mm 2x USB/1x Fan/Micro ATX-ITX


SECC 0,7mm / Plastic MicroATX Slim Case
240 W Power Supply
Included LCD Display
Brand Sentey
Series Slim Series
Model SS1-2421
Type MicroATX Slim Case
Glossy Black
Case Material
SECC 0,7mm / Plastic
With Power Supply
Power Supply BCP450-OM 250 Watt Constant/450 Watt Peak
Power Supply Mounted
PSU Main Connector 20+4Pin
Motherboard Compatibility
Micro ATX / ITX
With Side Panel Window
External 5.25″ Drive Bays
External 3.5″ Drive Bays
Internal 3.5″ Drive Bays
Hot-Swap Drive Bays 1 Sliding Bays
Expansion Slots
4 Low Profile
With front LCD display
Front Ports
Front Ports
USB 2.0 x 2 , Audio & Mic
Cooling System
80mm Fans 1 x 80mm Top Fans
Physical Spec
Dimensions(L x W x H)
15.74″ x 4.09″ x 12.79″
Weight 9.50 lbs.
Included LCD Display

Supports Micro-ATX / ITX

Glossy Black Painting

Slim and compact design

Supports Low Profile Cards

Included Power Supply Sentey BCP450-OM

Today’s EIO post is on educational language software that can help you stay competitive in the expanding globalized workforce.


Why Is Language Education Practical And Needed

Increasing globalization has created a large need for people in the workforce who can communicate in multiple languages. The uses of common languages are in areas such as trade, tourism, international relations, technology, media, and science.  Hundreds of languages are available for self-study, from scores of publishers, for a range of costs, using a variety of methods. But here at EIO, we recommend going with computer software.


Why You Should Choose PC Software As Your Learning Method

Software can interact with the individual in ways that other learning methods cannot:
1. Software fits into your schedule and is accessible at any time you are in front of your computer.  It allows people to learn at their own pace and doesn’t have the inconvenience of being required to sit in a classroom or attend a lecture.

2. Some software records the learner, analyzes the pronunciation, and gives feedback. Learning from software is like getting individual tutoring from a teacher.  It’s all one-on-one instruction.

Take A Look At Some Of Our Products


TOPICS Entertainment Instant Immersion Spanish Levels 1,2 & 3


Spanish Levels 1-2 -3Windows/Mac
Brand TOPICS Entertainment
Model 81122
Name Instant Immersion Spanish Levels 1,2 & 3
Type Learning
Operating Systems Supported Windows & Mac OS
Packaging Retail
Features Spanish Levels 1-2 -3 (v.2) Windows/Mac The Complete Language Learning System – Instant Immersion uses natural image association techniques to help you learn as easily as you learned your first language. With Instant Immersion, you will have more fun, save money and reach your goals faster. Contains 6 Language Learning CD ROMs + 3 Bonus Discs (Interactive DVD, Audio MP3 CD, “Who is Oscar Lake” game.) PC & Mac Compatible Minimum System Requirements: MAC OS X 10.3.9; Win XP/Vista, P4, 500 MHz, 512MB RAM, 1024 X 768 Color Display, Sound Card, CD ROM Drive



TOPICS Entertainment Instant Immersion English Levels 1-2-3


English Levels 1-2 -3
Brand TOPICS Entertainment
Model 81124
Name Instant Immersion English Levels 1-2 -3
Type Learning
Operating Systems Supported Windows & Mac OS
Packaging Retail








TOPICS Entertainment Instant Immersion German Levels 1,2 & 3


German Levels 1-2 -3
Brand TOPICS Entertainment
Model 81126
Name Instant Immersion German Levels 1,2 & 3
Type Learning
Operating Systems Supported Windows & Mac OS
Packaging Retail








TOPICS Entertainment Instant Immersion Japanese Levels 1,2 & 3


Japanese Levels 1-2 -3
Brand TOPICS Entertainment
Model 81128
Name Instant Immersion Japanese Levels 1,2 & 3
Type Learning
Operating Systems Supported Windows & Mac OS
Packaging Retail

There’s a lot more to the PS3 than just games, of course, so we’ve got PS3 accessories to make the most of the PlayStation’s gaming capabilities. There’s something for just about everyone available below.



THRUSTMASTER 2969089 Rally GT Force Feedback Pro Clutch Edition


“3 PEDALS” pedal set: wide and adjustable
works with the PS3 versions of: COLIN McRAE DiRT2 SUPERCAR CHALLENGE
Large and sturdy clamping system
Model 2969089
Type Controller
Features Also works with the PS3 versions of:
COLIN McRAE DiRT2 (Codemasters)
SUPERCAR CHALLENGE (System 3 Software Ltd)

“3 PEDALS” pedal set: wide and adjustable
3 pedals with wide foot rest
All 3 pedals are adjustable
Natural brake pedal resistance (for enhanced realism)

Many functions accessible directly on the wheel
10 action buttons (with 14 positions)
D-Pad (for car settings)
2 progressive levers + 2 digital levers

Exclusive “5 AXES” mode
Axis 1: Wheel
Axis 2: Gas
Axis 3: Brake
Axis 4: Clutch or left progressive cockpit view
Axis 5: Handbrake or right progressive cockpit view

Exclusive “Force” button
Lets you enable/disable re-centering directly during the game

2 gearshift methods (select between “Rally” or “GT” style driving)
Sequential gearshift stick (new life-size handle!)
2 digital levers behind the wheel (now reinforced)

High-quality materials
Oversized rubber-textured wheel
270° of rotation
Metal axle and ball bearing mechanism (for maximum precision and fluidity)
Mixed belt pulley and gears system (for a smooth and ultra-silent Force Feedback mechanism)
Large and sturdy clamping system

Force Feedback with TouchSense technology (licensed by Immersion Corporation)

THRUSTMASTER 2960703 T.Flight Hotas X FLight Stick


Programmable: the 12 buttons and 5 axles are entirely programmable.
Detachable, real-size, ergonomically-designed throttle control
Model 2960703
Type Joystick
Features Wide hand-rest for optimal comfort

Programmable: the 12 buttons and 5 axles are entirely programmable.

(**) This joystick is not distributed under licence or with the approval of Microsoft Corporation / Ubisoft / 505 Games.

Detachable, real-size, ergonomically-designed throttle control

Configurations by default:
PC : Flight Simulator X (**) Microsoft
PS3 & PC : Tom Clancy’s HawX (**) Ubisoft
PS3: IL-2 Sturmovik Birds of prey (**) 505 Games

Unique: Plug & Play for ultra-simple and fast installation with all functions pre-configured for immediate takeoff (without worrying about configuration)

Exclusive “MAPPING” button: all functions may be instantly switched around between each other

Dual-system aerodynamic control: by rotating handle (with integrated blocking system) or by progressive tilting lever

High-precision joystick with adjustable resistance

Trigger for brakes (civil flight) or for rapid fire (military flight) + multi-directional hat (panoramic view)

Internal memory: to save all of your programming, even with the joystick disconnected

Weighted base for greater stability

Exclusive “PRESET” button”: to switch, while playing, instantly from one programme to another

Turtle Beach EARFORCEP21 Ear Force PX21 Headset


3.5 Connector
16 ft Cable length
Brand Turtle Beach
Connectivity Technology Wired
Wireless Technology Not Applicable
Wireless Operating Distance Not Applicable
Sound Mode Stereo
Minimum Frequency Response 20 Hz
Maximum Frequency Response 20 kHz
Earpiece Design Over-the-head
Earpiece Type Binaural
Features The Ear Force PX21 integrates premium stereo game sound with crystal-clear communication on the PlayStation Network (PSN), XBOX LIVE and PC/Mac to create the definitive audio environment for playing popular game titles on all platforms. The PX21 is two headsets in one, a stereo USB headset for chat sound and an amplified stereo headset for game sound. If you’re serious about your PS3, XBOX 360 or PC gaming, then get serious about the sound. Move up to the Ear Force PX21 and become a better player while experiencing your games as they were meant to be heard.
Mad Catz MOV888810003/04/1 3DShot for PlayStationMove Motion Controller – Red


Wireless Controller
Model MOV888810003/04/1
Type Wireless Controller
Features Arm yourself with the latest in motion-sensing weaponry: Mad Catz’ 3DShot for the PlayStation Move motion controller. With a realistic spring-loaded trigger—which activates the motion controller’s trigger when squeezed—the 3DShot enhances gameplay and puts you in the midst of all the action. The ergonomically balanced design with its weighted feel gives the impression that you’re holding a well-crafted implement of destruction. Whether you’re taking down zombie enemies or obliterating terrorists futilely trying to escape your deadly aim, the 3DShot has your shooter gameplay needs thoroughly covered.

Realistic spring-loaded trigger activates motion controller button
Securely holds PlayStation Move motion controller
Enhances game realism
Ergonomically balanced with weighted feel

Works Great With:

Resident Evil5: Gold Edition
Time Crisis Razing Storm

Laptop Cooling Fans 101

eiodotcom —  September 21, 2012 — Leave a comment

Today’s EIO post is an introduction to some of our laptop cooling products.

Is a Laptop Cooler Really Important?

One thing that any laptop owner should be aware of is the fact that all electronic devices generate a certain amount of energy… simply by being used.  This energy is then used and dispersed in the form of heat, which is the reason why your laptop may heat up from time to time.  Manufacturers are aware of this problem, and consequently build their products to withstand a certain threshold of temperatures.  In this sense, laptops are already equipped with cooling fans and vents throughout the device. But as is often the case, overheating may and often does occur.  Consequently, whether or not a customer should look into purchasing a cooling fan depends on the individual habits of that person, as well as how and under what circumstances they plan on using the product.

Factors That Cause Excessive Heat That May Harm Your Laptop

Surrounding Temperatures:

Laptops are usually designed to withstand temperatures of up to 50 degrees Celsius maximum.  If, for example, you live in an area that regularly exceeds this maximum temperature, the likelihood of your device experiencing problems would be quite high.  Heat often builds up and takes some time to disperse from the inner casing of a laptop.  So if your equipment was permanently in a location with high temperatures, it would be a good idea to have something to cool it off before serious damage is done to the product.

Customer Use:
Many times customers enjoy using their laptops in conditions other than sitting at a desk or a table.  The reason they purchased the product, after all, was for the sake of mobility and comfort.  What often happens, however, is that customers begin using their laptops on the bed, sofa, carpet flooring, and especially their laps, and inadvertently block off the cooling vents.  This prevents any cooling air from escaping from the laptop.


In this sense, if you want to experience the full joy of owning a laptop and maintain the luxury of using it wherever you choose, it may be a good idea to purchase a laptop cooling fan.



Macally ECOFAN Bamboo Cooling Stand


Brand MacAlly
Type Docking Stations / Stands / Coolers
Features Organic
Ultimate thermal solution






COOLER MASTER R9-NBC-2WAK-GP NotePal X1 Notebook Cooler

Brand Cooler Master
Model R9-NBC-2WAK-GP
Accessory Type Cooler
Dimension (W / H / D): 14.37″ x 11.42″ x 2.13-2.76″
Fan Dimension (W / H / D): 4.72″ x 4.72″ x 0.98″
Bearing Type: Sleeve
Fan Life Expectancy: 30,000 hours
USB Port: USB2.0/1.1 x 2
Weight: 1.61 lbs.
Safety: FCC / CE / C-tick
Fan Airflow: 23 ~ 44 CFM
Rated Voltage: 5 VDC
Stylish design Large metal mesh surface for great cooling performance

Perfect wrist-resting position allows users to work at ease

Fan speed control

Convenient usage on the knee

Better airflow with ventilation at bottom

Ergonomic design provides perfect viewing angle

Two different height settings

Four anti-slip rubbers prevents the notebook from sliding

Convenient usage anywhere







SIIG AC-CL0112-S1 Swivel and Tilt Notebook Cooler

Brand SIIG
Model AC-CL0112-S1
Type Cooler
Specifications Fan speed: 2000 RPM
Air flow: 19 CFM
Noise: 21.26 dBA
Operating current: 0.14A

System Requirements
Notebook computer with an available USB port

  • Fits 11″ – 15.4″ notebooks
  • Ultra silent fan
  • 360 degree swivel base
  • Ergonomic adjustable tilt
  • USB powered – no additional external power needed
  • Extends notebook’s life by lowering its operating temperature
  • Protects your lap and prevents heat damage to your furniture
  • 6 level adjustable tilt, from 20 – 50 degrees







Thermaltake CLN0008 Thermaltake Massive23 CS Notebook Cooling Stand

Brand Thermaltake
Model CLN0008
Accessory Type Cooler
Dimension: 360(L) x 319(W) x 52(H) mm
Heatsink Material: Aluminum
Fan Dimension: Ø 200×20 mm
Rated Voltage: 5 V
Rated Current: 0.22 A
Started Voltage: 3.5 V
Fan Speed: 600±200 R.P.M.
Max. Air Flow: 57 CFM
Max. Air Pressure : 0.37 mmH2O
Noise: 17 dBA
Accessory: USB to DC Cable
Weight: 3.55 lbs. (1.61Kg)
Features Embedded ultra silent 23cm variable color LED Fan with On/Off switch.

Intakes massive cold airflow for best cooling effect

Aluminum material with black stylish design

Great combination of ergonomic and anti-slip design with versatile angle for optimal operating comfort.

Supports laptop dimensions 10″ ~ 17″, especially for wide-screen laptop.


Today’s EIO post is on our newest headset: the SYBA CL-AUD63032 3.5mm Connector Circumaural Headset.

Why over-the-ear-headphones

Over-the-ear headphones that are large enough tend to provide sound that can be reminiscent of a good pair of speakers. Many over-the-ear headphone enthusiasts are so satisfied with the quality of audio from their high-end cans that they don’t even own a pair of hi-fi speakers.

What are Circumaural (around-ear headphones)?

These types are the largest out there and are generally designed to fit around your earlobes. Of course, some versions of circumaural cans merely cup the back of your ear instead of completely surrounding your ear, but they still work the same way. The idea of around-ear-type headphones is to be able to accommodate larger drivers which can make a musical performance sound more realistic. The larger earcups also allow manufacturers to position the drivers at some distance from your ear, implement multiple drivers and angle the drivers in various ways to affect sound quality. Having earcups instead of earpads also ensures that they’re more comfortable when worn for longer listening sessions.



  • Brand: SYBA
  • Model: CL-AUD63032
  • Driver Unit: 40mm
  • Headphone Frequency Response: 20Hz-20KHz
  • Headphone Input Impedance: 32 ohm
  • Headphone Sensitivity: 108dB S.P.L. at 1KHz
  • Connector: 3.5mm
  • Ear Coupling: Circumaural
  • Cord Length: 4.83 ft.
  • Weight: Package: 0.8 lbs.
  • Microphone Sensitivity: Microphone Unit: 58 +/- 2db
  • Features: Purple/White colors match your taste. The lightweight design ensures excellent comfort for hours of use. Compatible with any device that features a 3.5mm outputs.                Rated Power: 100mW


New Product Monday!

eiodotcom —  April 30, 2012 — 3 Comments

Has it really been a week already? YES!, that means it’s time for even more new products. Check out the products for this week.

SeeedStudio KIT101E1P Rainbow Cube Kit- RGB 4X4X4

Looking for a fun and exciting project? Check out the Seeedstudio Rainbow Cube Kit it’s a 3D RGB LED Cube that contains 64 8mm RGB LEDs arranged in a 4 x 4 x 4 matrix. It can be used to create many beautiful visual effects with a programmable Rainbowduino. The Rainbow Cube comes with an built in 3.3V / 1 Amp LDO, so it can work independently. A XBee compatible socket is also included. You need some basic soldering skills to make this kit.


Need a Function Generator? Just in the Velleman HPG1 A complete 1MHz function generator with sweep function in a compact pocket sized package for testing on the go. Easy to use on screen menu lets you set output voltage or frequency and select between three waveforms.

VELLEMAN BH341USB 4xAA Battery Holder

We already carry a lot of battery holders that hold 2 AA batteries and 2 AAA batteries, but this one packs 4 AA batteries has a switch, cover and a USB port for the output. I’ve used these to power USB products or just in projects. It’s also nice to just have one laying around.