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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.
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.
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
Dave explains the three main methods of Uninterruptible Power Supply design - Offline, Online, and Line Interactive. And then opens an APC 2200XL rack mount UPS to see how well it matches the classic block diagram theory. Will there be any surprises? Schematic: http://eevblog.com/files/apc_smart-ups_su2200_3000.pdf Patent: Method and apparatus for providing battery charging in a backup power system http://www.google.com/patents/US5302858 EEVblog Main Web Site: http://www.eevblog.com EEVblog Amazon Store: http://astore.amazon.com/eevblogstore-20 Donations: http://www.eevblog.com/donations/ Projects: http://www.eevblog.com/projects/ Electronics Info Wiki: http://www.eevblog.com/wiki/
This video uses http://www.bin95.com/ Electrical Troubleshooting Simulation software to teach you how to troubleshoot an electrical motor control circuit. At the end is just an example how our software uses realworld workorder system to track student while doing electrical troubleshooting with our simulation software, and the detailed analysis report. (helps student learn better ways to troubleshoot.)
Ultratech UPS Interlock 01-25-01040 Repairs by Dynamics Circuit (S) Pte. Ltd.
Ultratech UPS / Interlock Power Supply 01-25-01040, Power Distribution Controller used in the Hitachi SEM can be repaired at the fraction of OEM cost.
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Dynamics Circuit (S) Pte. Ltd.
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#09-28 Win 5, Singapore 768091
Contact: (+65) 6754 7024
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