Friday, December 28, 2007

American students have created an electronic stethoscope

Experts of the American company have created the superoxidized water which should replace medical products of healing, disinfectant and restoring action. Development belongs to Oculus company. A key element of special water is a component named Microcin, which represents lattices from oxychloride ions - the charged molecules, which block a number of microbes. New development is effective at the preventive of diabetes, an ulcer and thrombus. Also new water kills only alien micro-bodies and sick cells, and healthy cells are interconnected, therefore this method is harmless for them. Experts of the company comment, that usual water also contains ions, hypochlorites and other elements, however their contents in it is not enough. Now experts assure that the superoxidized water is able to kill 10 kinds of bacteria which are on one ot the other way connected to various diseases. The company plans to present its invention at the International biomedical conference in Monte Carlo.

Thursday, December 20, 2007

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Tuesday, December 18, 2007

Microbric Viper Programmable Robot Kit! Awesome Value!


The MICrobric VIPER robotic kit welcomes you to the world of Microbric electronic sets. With Microbric, you can build complex electronic devices with little or no prior electronics knowledge. As no soldering is involved and the parts are fully reusable, you can build and rebuild programmable robots as many times as you like. The Viper kit allows the user to build a programmable "bump" robot that can be controlled via a wireless transmitter (included) or by user-programmed instructions.

Microbric's patented electronic connection system is like nothing that has ever come before. The simple mechanics allow you to assemble the pieces in any way you like without having to worry about making irreversible mistakes.

This robot kit
has a BasicAtom Microcontroller on board, and comes complete with 2 motor modules, Bump sensor modules, LED's, Switch Modules, IR Receiver Module, IR Remote control & serial port connection hardware. Make what you like, how you want and then program it. You are in total control, limited only by your imagination. The Viper is programmed in BASIC which is a text-based programming language. Ideal to learn the basics of real world programming & robotics hardware.


There is nothing else like this on the market. Tremendous value for your money! The easy to assemble Microbric Viper Programmable Robot Kit is suitable for the individual enthusiast and the educational market.

Thursday, December 13, 2007

Circuit Board Manufacturing

Circuit board manufacturing should be done carefully since it involves sensitive components. There are 9 steps involved in circuit board manufacturing, and these are: patterning or etching, lamination, drilling, plating and coating, solder resisting, screen printing, testing, populating, protection, and packaging. Here is a simple step-by-step guide on how each step is performed.

Patterning
Patterning is the first step involved in circuit board manufacturing. Also known as “etching”, it is done by sticking a copper layer over a whole substrate and then removing them afterwards by patterning a temporary mask to leave only the important traces of copper. Some PCBs are also made by including traces to a substrate that has a thin copper layer or a bare substrate by multiple electroplating processes. Other copper removal methods for PCB include the following: PCB Milling – This method utilizes 2 to 3 axis mechanical milling systems for removing copper from the substrate. Silk screen printing – This method utilizes etch-resistant-inks. A sequence of etching is done for removing unwanted copper while protecting the copper foil. The ink can be printed on a blank but non-conductive board or on a conductive board. Photoengraving – This method makes use of chemical etching and a photomask for the removal of the copper foil.

Lamination and drilling procedures Multi-layer print circuit boards have trace layers inside them. They are formed by laminating thin boards that are separately etched from one another together. Next, drilling of vias or holes is done with a tungsten carbide drill bit. The drilling is done by automated drilling machines and the placement and positioning of holes is controlled by a drill file or a drill tape. If there is a need for small holes, they can be drilled by lasers for more control.

Plating and coating to prevent solder
Part of circuit board manufacturing is plating or coating areas with polymer solder resist or solder masks. This is done to prevent short circuits that are caused by the solder when it bridges between conductors. A coat is also made to serve as protection from harsh environments.

Screen printing
Screen printing is done by printing text and line art on the external surfaces of PCBs. If there is enough space, the text can depict component designators, test points, switch setting requirements, and other features to aid in assembling, servicing, and testing the circuit board. The process is also called red print for one-sided PCBs and silk screen. Digital printing can also be utilized for this process. It allows barcodes and serial information to be included in the PCB.
Testing and populating
Next, unpopulated boards are subjected to bare-board testing where all circuit connections are verified for “correctiveness.” A fixture, a bed of nails, or rigid needle adapters are also used for mass production. After the completion of the PCB, electronic components are attached to form the assembly. These components are attached by inserting them through holes, mounting them on the surface, and soldering. Afterwards, they are subject to tests again. If the tests fail, the components are going to be replaced.

Protection and packaging
To protect the printed circuit board against harsh environmental conditions, they should have a conformal coat that is applied by spraying or dipping them after attaching the components. The coat aids in preventing leakage currents, corrosion, and shortening. The coat is made of wax or a diluted solution of polyurethane, epoxy, acrylic, or silicone rubber.

Finally, when transporting PCBs, they should be in antistatic bags and the person handling them should be earthed to avoid static electricity from damaging them. Circuit board manufacturing companies like Almatron practice these safety measures to ensure high quality printed circuit boards.

Saturday, December 8, 2007

Analog Synthesizer Resources

This is a collection of some of my favorite synthesizer links. It is not meant to be complete; there's a lot of material out there, so I'm limiting this list to historical documents, original work, well-referenced work, and my own personal likes. For instance, there are a lot of schematics available on the web for filters derrived from the Moog VCF; I won't be tracking these.

Many of these links are from the "Synth DIY" crowd, a community of electronic music enthusiasts who have collected together on the internet to share electronic design ideas and build synthesizer modules. Interestingly enough, over three decades after Robert Moog introduced the modular music synthesizer, and over 15 years after most electronic music companies have abandoned the field, these folks are making some impressive advances. A vintage technology revival? No, just building a musical instrument with the appropriate technology.

 

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