Today’s EIO post is on audio amplifier boards. Amplifiers are devices that increase the gain of an audio signal and currently dominate modern audio technologies. With audio amplifier boards, you can design and build your own audio amplifier from scratch using basic electrical engineering principles.



The term amplifier refers to any device that increases the amplitude of a signal, usually measured in voltage or current. This versatile device is used in a variety of different electronic applications. Especially in audio technology, a wide range of amplifiers can be produced based on product specifications (i.e. power, voltage, current). Currently, there are many types of audio amplifiers available for consumers. Sound signal amplification is used for instruments, such as the guitar or the bass. They are also used commonly in home theater systems and with stereo speakers. The basic design behind all of these amplifiers is derived from the simplest concepts of circuit design.

Classes of Amplifiers:

Assembled in different configurations, resistors, capacitors, and transistors can create several classes of amplifiers that can be distinguished by performance characteristics. Class A amps are very linear (meaning the integrity of the signal is maintained through the amplification process); however, this amplifier topology is known to be very inefficient. In addition, Class A amplifiers invert the signal (meaning the function is reflected over its axis). Class B amps are much less linear, leading to higher distortion of the signal, but they are much more efficient. Since a Class B amp only amplifies half of a signal, two Class B amps are generally used in synchronization. The compromise between these two topologies is the Class AB amplifier. The Class AB is more efficient than the Class A with lower distortion than the Class B. Often the different types of amplifiers are used in combination with other amplifiers into order to achieve the specifications of a particular design.

Some of Our Products:

Sure Electronics AA-AB32291 2 X 250Watt Class D Audio Amplifier Board – IRS2092


supplier: Sure Electronics859

part #: AA-AB32291

Suppliers: Sure Electronics  Type: Audio
Each channel is rated at 250WEfficiency: 90% @ 250W,8Ω, Class D stage
Brand Sure Electronics
Model AA-AB32291
Specifications Output Power: Each channel is rated at 250W
·Efficiency: 90% @ 250W,8Ω, Class D stage
·Multiple Protection Features: Over-current protection (OCP), high side and low side MOSFET
·Over-voltage protection (OVP)
·Under-voltage protection (UVP), high side and low side MOSFET
·DC-protection (DCP)
·Over-temperature protection (OTP)
·PWM topology: Self-oscillating PWM and half-bridge.·Power Supply Voltages:±60V
·Load Impedance:8Ω
This 2 X 250Watt Class D Audio Amplifier Board – IRS2092 is a state-of-the-art dual channel Class-D audio amplifier which integrates IRS2092 Class D audio driver IC, along with IR’s digital audio dual MOSFETs. This amplifier is capable of delivering dual-channel amplification with each channel up to 250W. High quality and high performance components are used making this amplifier high-quality amplifier. Powered by ± 55V to ± 65V supply, it can be used in many ampplications like Background Music Systems. It also features thermal protection, Over-current protection, Over-voltage protection, Under-voltage protection and DC-protection. In addition, on-board heat sink ensures excellent heat dissipation.
This is an exceptionally well designed amplifier, with low distortion, good S/N ratio, low consumption and full protection. Having all these almost ideal characteristics this amplifier is likely to become the basic building block of your future high fidelity system, or it can also become the element that will upgrade your existing system.

Sure Electronics AA-AB32261 2 X 150 mW Class-AB Headphone Amplifier Board – LM4881


supplier: Sure Electronics859

part #: AA-AB32261

Suppliers: Sure Electronics  Type: Audio
0.025% THD+N @120mWrms 16Ω0.02% THD+N @75mWrms 32Ω
Brand Sure Electronics
Model AA-AB32261
Specifications Features:
Thermal shutdown protection circuitry
Adjustable gain
Wide power supply range: 8V-24V
Audiophile Quality Sound:
0.025% THD+N @120mWrms 16Ω¸
0.02% THD+N @75mWrms 32Ω¸
Mini/Micro Systems
Personal Computers
Microphone Preamplifier
MP3 Video CD Output Amplification
Features Use this DIY 2*150mW audio amplifier board which is a perfect class-AB architecture integrated LM4881 chips to achieve the single-channel 150mW power output. Moreover, integrated with LM4881 chip, this board also supports two-channel amplification and can be powered by any DC power supply ranging from 8V to 24V.

Sure Electronics AA-AB32191 2 X 300Watt Class-D Audio Amplifier Board – TAS5630


supplier: Sure Electronics859

part #: AA-AB32191

Suppliers: Sure Electronics
Type: Audio
Frequency response: 20Hz to 20KHz(±3dB)Power supply: 20V to 50VDynamic Range: >100 dB
Brand Sure Electronics
Model AA-AB32191
  • Power supply: 20V to 50V
  • Channel Separation: >89 dB 1 kHz
  • Dynamic Range: >100 dB
  • Frequency response: 20Hz to 20KHz(±3dB)
  • Signal/Noise Ratio: 100dB(A-Weighted)
  • High Output Power
50W @4 Ω, <0.02% THD+N
100W @ 4 Ω, <0.03% THD+N
200W @ 8Ω, < 0.40% THD+N
  • Operating Temperature: 0℃ to 50℃
  • Storage Temperature: -20℃ to 105℃
Features Another new member of Class-D audio amplifier family comes out – AA-AB32191 which is capable of delivering dual channel amplification with each channel up to 300W. This amplifier is a state-of-the-art dual channel Class-D audio amplifier which integrates TI’s TAS5630 as the driver. High quality and high performance components are used making this amplifier high-quality amplifier. Powered by 20V to 50V supply, it can be used in many applications, such as Home Active Speaker, AV Receiver, Mini Combo System, etc.. It also features short-circuit and thermal protection. In addition, on-board heat sink and cooling fan ensures excellent heat dissipation.

Today’s EIO post highlights an exciting new product (The Makey Makey) that allows consumers to turn everyday objects into touchpads for use with the internet and PC programs.


How Does It Work?

The Makey Makey comes with a set of alligator clips, a USB connector and the interface board. It’s simple to use! All one has to do is load up a computer program or any webpage and you are essentially ready to get started!

For example, let’s say you load up a piano. Then, instead of using the computer keyboard buttons to play the piano, you can hook up the MaKey MaKey to something fun, like bananas, and the bananas become your piano keys:


Once connected, when the user touches the bananas they will perform as the keys on a piano board! Or let’s say you Google for an online “Pacman” game and draw a joystick with a pencil (yes, an actual ordinary pencil):


Then you can play Pacman by touching the drawing with your finger!

What Materials Work With Makey Makey:

Any material that can conduct at least a tiny bit of electricity will work (if it doesn’t already work, just rub it with bananas, spray it with water, or apply copper tape). Here are some materials people have used in our workshops including Ketchup, Pencil Graphite, Finger Paint, Lemons, etc.

Other materials that work great: Plants, Coins, Your Grandma, Silverware, Anything that is Wet, Most Foods, Cats and Dogs, Aluminum Foil, Rain, and hundreds more…


MaKey MaKey works with any laptop or computer with a USB port and a recent operating system. How recent? We have tried it with Windows XP, Windows Vista, Windows 7, and Mac OSX.



Samsung Solid-State Drives

eiodotcom —  February 15, 2013 — Leave a comment

Today’s EIO post is on Samsung’s new energy-efficient solid-state drives (SSDs).

Samsung Solid-State Drives Overview

The gold standard in speed, capacity, and dependability.



Increase energy efficiency while avoiding drive wear and tear

Samsung’s flash-based SSDs help maintain 24 x 7 uptime for mission-critical servers, RAID systems, and network-attached storage. For mobile devices, Samsung SSDs offer small form factor and light weight, together with low power consumption in active and idle modes to lengthen battery life. Because SSDs have no moving parts, they start up instantly and are not subject to the physical wear and tear that can gradually degrade the reliability of traditional hard disk drives.


Design advantages of Samsung SSDs include:


  • Accelerated read and write operations with outstanding multitasking capabilities
  • Varied interfaces enabling connections to different types of host devices
  • Exceptional durability with high shock and vibration tolerance






Preview Some of our Products


135SAMSUNG MZ-7PD256BW 840 Pro Series 2.5″ 256GB SATA III MLC Internal Solid State Drive (SSD)




category: Computers

supplier: Samsung part #: MZ-7PD256BW

Capacity: 250GB – 350GB
 Interface: SATA III  Form Factor: 2.5″
Series 840 Series
Model MZ-7PD256BW
Device Type Internal Solid State Drive (SSD)
Used For Consumer
Expansion / Connectivity
Form Factor
Capacity 256GB
Interface Type SATA III
Controller Samsung MDX Controller
Height 7mm
Max Sequential Read 540 MB/s
Max Sequential Write 520 MB/s
MTBF 1,500,000 hours
Power Consumption (Idle) 0.054W
Power Consumption (Active) 0.069W

Velleman Screwdriver Sets

eiodotcom —  October 26, 2012 — Leave a comment

Today’s EIO post is an introduction to some of Velleman’s screwdriver sets.

We sell a wide variety of screwdriver sets that can be useful in a large number of projects.  Whether you need smaller precision screwdrivers for delicate projects or a larger and more robust set, you’re sure to find something that fits your needs in the options below.


  • swivel-headed cap
  • black oxidized tips for greater durability and accuracy
  • ideal for: TV sets, communication instruments, optical instruments, cameras, computers, VCR’s, telephones, etc.
  • 4 philips: PH#1-1, PH#1-2, PH#0, PH#0-2
  • 3 socket: 0.12″, 0.16″, 0.20″
  • 3 hex: 0.06″, 0.08″, 0.10″
  • 6 flat: 0.04″, 0.06″, 0.08″, 0.09″, 0.12″, 0.15″


   * bit length adjustable (0.6″ – 3.7″) by sliding it up into or out of the hollow handle

* 6 different blades (12 bits) (L : 4.3″)

  * contents:
o 1 handle (L : 4.3″)
o philips: PH00, PH1
o flat: 0.08″, 0.16″
o ‘star’: T5, T6, T7, T8, T9, T10, T15, T20


  • philips: 1 PH0, 1 PH1
  • flat: 2 0.05″, 4 0.04″, 1 0.06″, 1 0.08″
  • special set for watches, precision applications, etc.
  • ideal for: TV sets, communication instruments, optical instruments, cameras, computers, VCR’s, telephones, etc.


ideal for: TV sets, communication instruments, optical instruments, cameras, computers, VCR’s, telephones, etc.

  • flat: 0.12″x1.6″, 0.08″x1.6″, 0.10″x1.6″, 0.14″x1.6″, 0.16″x1.6″
  • philips: PH#00×1.6″, PH#0x1.6″, PH#1×1.6″, PH#2×1.6″
  • ‘star’: #T6x1.6″, #T8x1.6″, #T9x1.6″, #T10x1.6″, #T15x1.6″, #T20x1.6″
  • size: 4.7″

Halloween DIY Project

eiodotcom —  October 25, 2012 — Leave a comment

With Halloween less than a week away, we here at EIO thought it fitting to highlight one of our holiday products.  The Velleman MK166 offers a fun DIY project for those wanting to create a decoration of their own making. Make this into a great Halloween gadget that greets your guests with surprising and creepy sounds!


VELLEMAN MK166 Animated Ghost












Note:  This item requires assembly and also a soldering station.

Soldering station sold separately.




Model MK166
  • ghost responds to sudden noises
  • adjustable sensitivity
  • battery operation: 2xAAA battery
  • dimensions: 5.39 x 2.68 x 1.97″
  • great Halloween gadget
  • greets your visitors
  • for shops, parties, events or just for fun

New Targus Products

eiodotcom —  October 24, 2012 — Leave a comment

Today’s EIO post spotlights some new products we have available from Targus.

Targus TSS077US Black/Gray Accents 14.1″ Slipskin Peel Laptop Case

This new laptop sleeve case from Targus is super lightweight and provides good protection for laptops.  It will fit laptops with any screen size up to 14.1″.

Dimensions:  14″ x 11.25″ x 0.9″

Weight: 0.89 lbs.

Material: Neoprene

Targus TBR006US Black/Gray 15.6″ Zip-Thru Mobile Elite Roller

This new item from Targus is ideal for work or school travel.  It has a separate compartment for the laptop, which allows for easy access when going through security and x-ray screening.  Also, it comes with a lot of extra storage space for bigger items, such as clothing for overnight stays.


Dimensions:    16″ x 13″ x 7.09″

Material: Nylon/Polyester

Fits screen sizes up to 15.6″

Weight: 6.27 lbs.

To see a full listing of our Targus products click here.

New Keyboards & Mice

eiodotcom —  October 12, 2012 — Leave a comment

Today’s EIO post is a highlight on some of our new computer keyboards and mice.

This week we got several new items that you can accessorize your desktop with.  Whether it be wireless keyboards and mice or if you choose to opt for a more ergonomic setup, we have a variety of products that can fit your needs.



Kensington K72406US PocketMouse Black 3 Buttons 1 x Wheel USB Wired Optical 1000 dpi Mobile Mouse


Compact size for travel convenience

Reliable plug-and-play operation with wired USB connection

Scroll wheel with middle button





Targus AMU81USZ Black 3 Buttons 1 x Wheel USB Wired Optical 1000 dpi Mouse


USB Optical 3-button mouse

1000 dpi







Macally Pebble 5 Button USB Laser Mouse


4-way scrolling with Tilt Wheel Technology

Selectable laser resolution (400, 800 and 1600 dpi)

Ergonomically designed






Microsoft B2L-00002 Comfort Curve Keyboard 2000 Black 105 Normal Keys USB Wired Ergonomic Keyboard

Spill-resistant design
Don’t worry about liquids near your desktop—this keyboard is designed to withstand accidental spills.

Ultra-thin profile keys
The sleek, notebook-like keys feel comfortable and look great.

Comfort Curve keyboard design
If you prefer a flat keyboard, let this ergonomic design help your hands rest in a more natural position.

Cutting-edge design
Improve your performance as you keep current with the very latest technology Microsoft has to offer.


LOGISYS KB209BK Streamline Character-illuminated Blue LED Keyboard Black USB Wired Ergonomic Keyboard

The Streamline Designed Full-sized Blue LED keyboard has the newest Apple style clean-cut square-shaped key design.

Each key was individually positioned with space between keys to make the typing easier and faster.

With the UV illumination technology, the lighting is much brighter and comfortable to your eyes.

The keyboard uses the latest anti-slip rubber-like material for soft touch typing experience.

The PerfectStroke key system distributes typing force evenly across key surfaces, making every keystroke comfortable, fluid and whisper-quiet!

Like all Logisys illuminated keyboards, the keyboard has the longest power cord (7 Feet) in the market.


LOGISYS KBMS202BK Black USB Wired Standard Enhanced Keyboard and Mouse Combo

Keyboard features:
Streamline, durable design ideal for new systems and replacement applications.
Low-force key switches provide quiet and positive tactile response.
Adjustable tilt mechanism offers comfortable typing positions

Mouse features:
Reliable USB wired mouse.
3D optical scroll wheel mouse.
Quiet performance with best value.
800dpi resolution to work with various applications.
Over 1million cycle of switch life.
Plug and play

Enermax KM001W Briskie Keyboard & Mouse – Black

  • Number of Keys: 107
  • Pointing Device Type: Mouse
  • Pointing Device Connectivity Technology: Wireless
  • Pointing Device Wireless Technology: RF
  • Movement Detection: Optical
  • Movement Resolution: 1600 dpi
  • Number of Total Buttons: 4
  • Scroller Type: Scroll Wheel
  • Keyboard/Keypad Host Interface: USB
  • Pointing Device Host Interface: USB
  • Keyboard/Keypad Color: Black
  • Pointing Device Color: Black
  • Keyboard/Keypad Height: 0.65″
  • Keyboard/Keypad Width: 17.80″
  • Keyboard/Keypad Depth: 5.24″