Archives For Development Tools

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.

DIY Kits from Velleman

eiodotcom —  June 20, 2012 — 4 Comments

Today’s Eio post is on our wide array of Do-It-Yourself Project Kits.

If you have an itch to build or design something electronic, look no further than Velleman, based out of Fort Worth, Texas. They have several kits that are not pre-assembled.

As a side note, the “K” (e.g., K2601) or “MK” (e.g., MK171) series are kits, meaning you must assemble them yourself.

The “VM” series are the pre-assembled versions of the K or MK products.

Velleman FM Radio Kit (MK118)

This build it yourself FM radio kit allows you to assemble your own FM radio. Learn how to build a simple FM receiver with bandwidth of 88-108 MHz. It is easy to assemble, there are no annoying coils to wind, and it comes with a pre-assembled and tested FM front end. All you have to do is set up the development circuit board, attach the FM front end, ON/OFF switch, volume control, and LED indicator on, and get listening to the airwaves!

Velleman Stroboscope Kit (K2601)

Make your own disco party with Velleman’s Stroboscope kit. It creates flashing light effects similar to disco halls, or your own snapshots and lightning light effects. Wow your family and friends when they see the amazing effects of this wonderful DIY project!

Velleman Water Alarm (MK108)

This water alarm kit is tremendously practical. Put it in a corner and it gives an alarm sound when water is detected. It also has an incorporated alarm buzzer. Find leaks in your roof, mildew or mold in your closets, or problem areas in other parts of your house!

Velleman Digital Voice Changer Kit (MK171)

This digital voice changer kit is both fun to design and hilarious to use! Make your voice, no matter how high or low, sound like a robot. Add a vibrato effect similar to how your voice sounds when in front of a fan. It also includes “pitch”-buttons to make your voice sound lower or higher. This wonderful kit comes with a built-in microphone and power amplifier with volume control. All you need to do is just add a speaker. Have a blast wowing your friends at parties, changing your voice to create new characters and personalities, make up group games, even make the occasional prank phone call!

Go forth, DIY enthusiasts, and create, build, form, design, mold, craft, establish, erect, envision, and more!!

See also:

Arduino: an Introduction

eiodotcom —  May 16, 2012 — 5 Comments

Today’s Eio post will cover the Arduino.

Picture of Arduino, courtesy of

What is it?

The makers of Arduino define it as “an open-source microcontroller platform, designed for ease of use in terms of both hardware and software.” In other words, it is a popular open-source electronic development board that “is capable of controlling just about any DIY hardware project.” It possesses a basic code (for example, it can turn an LED on, or fan to a certain temperature), so that you do not have to be a master coder or programmer. And Arduinos are at the heart of most DIY electronic projects.

If you are still having trouble conceptualizing what an Arduino is, Lady Yaya, founder of Adafruit, explains arduinos less by definition and more by example. She says this:

“The ‘what is Arduino?’ is still a little vague, and that’s the Arduino’s strength. It’s the glue people use to connect tasks together.The best way to describe an Arduino is with a few examples. Want to have a coffee pot tweet when the coffee is ready? Arduino. Want to have a Professor X Steampunk wheelchair that speaks and dispenses booze? Arduino. Want to make a set of quiz buzzers for an event out of Staples’ Easy Buttons? Arduino.

Why are they so popular?

As I mentioned before, you don’t have to be a master programmer or coder to use Arduinos. Ehow says there is a certain Arduino programming “environment” which makes Arduinos extremely beginner- and user-friendly. The prewritten software and language is easy to learn for beginners. Arduinos also possess prewritten libraries which “allow you to add complex functionality to your programs quickly and easily.” This user-friendly environment is why Arduinos are so popular.

And if you’re a more advanced user, Arduinos have the ability to program code directly. Or, if you’re super ambitious, hardware design information is available for those who would like to assemble an Arduino by hand.

Furthermore, Arduino related resources, such as tutorials, online-forums, and DIY projects, abound on the internet, making Arduino even more accessible to the electronic enthusiast.

Some helpful forums include: forums and Adafruit forums. Ehow has a whole host of Arduino related posts. There are even entire blogs devoted to Arduino projects, hints, and tips!

Here are some neat Arduino development boards Eio carries:

Arduino Mega 2560

SeeedStudio ARD128D2P Seeeduino V3.0(Atmega 328P)

See also:

Breadboards 101

eiodotcom —  May 15, 2012 — 6 Comments

Today, Eio will briefly discuss breadboards.

A breadboard is used to build and test an electronic circuit design quickly before finalizing its design. Breadboards are construction sites for circuit prototypes,where one tests, samples, or models an idea or concept for an electronic circuit to see if it works.

Standard Breadboard

Breadboards look like rectangular plastic boxes filled with tiny holes, in which you insert wires or other electric components. When you insert electronic pieces into these points of contact (also known as “nodes”) in various patterns, a circuit is formed.

Most breadboards are solderless, meaning no soldering is required to attach the wires into the nodes, and are thus, reusable. The easy thing about creating circuits on breadboards is that you can remove or rearrange wires from the nodes to test if some components work better than others.


There are two main advantages for using breadboards. One, is that they are test sites to experiment on. If you mess up, the breadboard takes the damage, not your more expensive electronic equipment. Secondly, breadboards are often reusable because no soldering is required.


One disadvantage is that breadboards are only useful for experimenting with a few components. They cannot hold thousands of wires or connections, nor can they be used for circuits with high frequencies, voltages, or currents. In these ways, breadboards can only be used for simple experiments on smaller scales.

If you want to make your own breadboard project, I found this site extremely useful in a step-by-step process of what to do.

Eio has all sorts of breadboards, from the simple, such as the Tie Point Mini Self-Adhesive Solderless Breadboard (White)

to the more technical and complicated, such as VELLEMAN SD35N SOLDERLESS BREADBOARD

See also: