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How to use an N channel MOSFET (a type of transistor) to turn anything on and off! Also, remember to put a 100k resistor between gate and ground if you want your FET to stay off by default. IRFZ44 MOSFETs on Amazon: http://www.amazon.com/exec/obidos/ASIN/B00CFEVJ7M/afromods-20 Main tutorial webpage: http://www.afrotechmods.com
Power Transmission Engineer Lionel Barthold Explains how 3 phase, 6 phase, and 12 phase power works, advantages, disavantages, and hopes for the future. Rotating phases, form an anisotropic tube. He worked on experimental 6 and 12 phase power lines at his company Power Technologies, Inc. before it was sold to Siemens after a long successful career. The experimental polyphase lines were located in Malta, New York, not far from company headquarters in Schenectady.
The Markley Group demonstrates how power at a UPS in a data center is transferred without its critical loads seeing any interruption. Routinely this type of procedure is performed at One Summer Street to allow technicians to safely work on critical electrical equipment without any risk to your information. Video by Christopher Huang
I used my DIY scanning electron microscope to view a 555 timer circuit while it was powered. The circuit is a simple oscillator with a very long time constant to make the changes easy to see. My plan was to view the silicon die itself, and hopefully discern changes in its internal circuitry as the oscillations occurred. As it turns out, I was only able to "see" the charge of the electrical wires going to the chip socket. There is likely a clear oxide layer that covers the silicon die, and needs to be removed with hydrofluoric acid in order to use the SEM to inspect the die itself while powered.
My personal experience with heat toner transfer method of making PCB. It works ONLY with laser printer. Purpose of chemical tinning in last step is to protect copper against oxidation and provide good solderability. Using Liquid tin is optional. Tinning can be done manually with regular solder, flux and iron. All chemicals used in PCB manufacturing should be available at electronic hobby shop or can be found online. There's list of product distributors at manufacturer's web site http://www.mgchemicals.com/distributors/index.html My DIY tutorials and fun projects at http://www.apdigitallight.com/
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