CEPD News 
June, 2015 - Vol 8, Issue 4
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Wire routing
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IEEE Dine and Learn

Encryption != Protection. A proposed framework for thinking about file security

By Joseph Webster

    Experience has shown that current encryption solutions suffer from some known drawbacks. Namely, the cloud has not proved to be the silver bullet for solving implementation hurdles that we hoped, users hate managing volumes of accounts, and key/certificate exchange is STILL a huge barrier to wide spread acceptance. A proposed framework is presented.

    Joseph Webster, CISSP is a founding member of Secourier LLC, developers of ShieldMyfiles. He is a Software and Systems Security Architect specializing in high quality secure software systems to protect privacy, valuable assets and intellectual property.  

Date:June 9, 2015
Time:6:00pm - 9:00pm
Rock Bottom Brewery  "Promenade Room" 
10633 Westminster Blvd #900 
Westminster, CO 80020
MAP:Click here for Map
6:00 - 6:15 Registration and Appetizers 
6:00 - 7:15 Dinner and Networking 
7:30 - 9:00 Presentation
Please register as space is limited! (Click Here)
Know your Windings

   There are many ways to arrange or wind wires, or run PCB traces, and good reasons to use, or to avoid them. By researching and following the best technique for your application, you will save time and reduce frustration. Here is a list of several methods and a comment about their use: 

  • Bifilar- A twisted pair winding. When one wire is used for the primary and the other for the secondary, very tight magnetic coupling occurs at the expense of reduced isolation. When both wires are connected at the ends, RF conductivity is improved due to the larger outer surface or skin area.
  • Litz- a multifilar method with many connected wires bundled and twisted into a single rope-like strand. RF conductivity is greatly improved due to the larger outer surface or skin area. The chaotic currents and heating effects of imposing high magnetic fields on the wires (proximity effect) is reduced. 
  • Serpentine- This is a technique of snaking the wiring back and forth. It is often used to reduce EMC issues for excess cabling. Serpentine wiring is used to improve field patterns in superconducting magnets.
  • Figure 8- a serpentine method to bundle excess cables for EMC considerations. 
  • Sectional- creating an insulated gap between groups of windings can be used to improve dielectric breakdown, and reduce capacitive coupling.
  • Ayrton-Perry- this winding pattern has both low inductance, and low capacitance which makes it great for winding power resistors. 
  • Basket- used for RF coils requiring high number of turns with low parasitic capacitance and reduced proximity effects.
For more information see:
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