DIY Hearing Aid

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DIY Hearing Aid

Hearing aids are expensive little devices, typically costing a few thousand dollars each. They need to be highly integrated to fit in the ear, while still providing signal processing to ensure good audio quality.

This DIY hearing aid does some intelligent signal processing. It uses an electret to capture audio, then uses a pre-amplifier to increase the gain 100 times. The next stage consists of four filters, dividing the input signal by frequency into four parts. These are passed into four LTC6910 programmable gain amplifiers, which allow an Arduino to control the gain of each channel. The LTC6910 takes 3 digital inputs that are used to set the gain value.

To determine which gain to use for each frequency band, the Arduino needs to know how much power is in each band. This could be done using a Fast Fourier Transform, but that would require quite a bit of processing power…

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Reverse Engineering a Candle Flicker LED

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Candle Flicker LED

Candle flicker LEDs are a one part replacement for a real candle. They contain both a yellow LED and a control chip that modulates the light to create a candle effect. [Cpldcpu] took a deep look into reverse engineering one of these LEDs.

To analyze the circuit, which is potted into the LED itself, a shunt sense resistor was connected to the LED. By connecting this resistor to a logic analyzer, the control signal could be observed.

This control signal looked like pulse width modulation, with some randomness to the duty cycle. [Cpldcpu] determined that a linear feedback shift register was most likely used to generate a pseudeorandom bitstream, and some shaping was applied to make the LED look more like a real candle.

It turns out a blinking LED can be quite complex, and this takes a deep look into it by analyzing the signal. [Cpldcpu] took the…

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Nanotechnology

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Have you ever find yourself wondering what nanotechnology is? Well you are a few inches away from the answer. scroll down and see…   Well then Nanotechnology is the science and technology of building devices, such as electronic circuits, from single atoms and molecules, invented by a brilliant American physicist Richard Feynman (1918–1988) in 1959. Nanotechnology controls matter on an atomic level, modifying its effects to achieve desired results. Its uses and applications are therefore extremely numerous.

Two main approaches are used in nanotechnology.In the “bottom-up” approach, materials and devices are built from molecular components which assemble themselves chemically by principles of molecular recognition.In the “top-down” approach, nano-objects are constructed from larger entities without atomic-level control

The impetus for nanotechnology comes from a renewed interest in colloidal science, coupled with a new generation of analytical tools such as the atomic force microscope (AFM), and the scanning tunneling microscope (STM).

Combined with refined processes such as electron beam lithography and molecular beam epitaxy, these instruments allow the deliberate manipulation of nanostructures, and led to the observation of novel phenomena. Examples of nanotechnology in modern use are the manufacture of polymers based on molecular structure, and the design of computer chip layouts based on surface science.

Despite the great promise of numerous nanotechnologies such as quantum dots and nanotubes, real commercial applications have mainly used the advantages of colloidal nanoparticles in bulk form, such as suntan lotion, cosmetics, protective coatings, and stain resistant clothing. Modern synthetic chemistry has reached the point where it is possible to prepare small molecules to almost any structure.

These methods are used today to produce a wide variety of useful chemicals such as pharmaceuticals or commercial polymers.

This ability raises the question of extending this kind of control to the next-larger level, seeking methods to assemble these single molecules into supramolecular assemblies consisting of many molecules arranged in a well defined manner. These approaches utilize the concepts of molecular self-assembly and/or supramolecular chemistry to automatically arrange themselves into some useful conformation through a bottom-up approach.

The concept of molecular recognition is especially important: molecules can be designed so that a specific conformation or arrangement is favored due to non-covalent intermolecular forces.

The Watson-Crick basepairing rules are a direct result of this, as is the specificity of an enzyme being targeted to a single substrate, or the specific folding of the protein itself.

Thus, two or more components can be designed to be complementary and mutually attractive so that they make a more complex and useful whole.

For more information about the topic Nanotechnology, read the full article at Wikipedia.org, or see the following related articles:

DIY Engineering

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Hi Bloggers…

This is a new blog specially for all armature and gurus both S.R and J.r Engineers, to share their DIY projects. My main aim is to ensure continuity in the armature part of technology, which will be achieved through team work. So why can`t we grab the chance and go for it!!. Do it yourself (DIY) is the method of building, modifying, or repairing something without the aid of experts or professionals. This can be either from scratch or from hooking up few electronics.

Please feel free to share your electronics projects with me, either tested and proved or not and through team contributions, we may find a better way to modify and boost the project to pro level. Also feel free to ask questions related to electronics and computers.

By Engineer s.r Geoffrey Maragiah

(C) J.r Engineer Geoffy  Elmaragiah  (Administrator)