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| www.esacademy.com/myacademy/ | ESAcademy MyAcademy Online Training Center | 
| www.circuit-magic.com/ | Educational software for teaching circuits theory. Symbolic circuit's simulation and analysis using Kirchhoff's laws, node voltage and mesh current methods. | 
| www.ecet.mauicc.hawaii.edu/ics/ | Computer Science Courses | 
| www.ecet.mauicc.hawaii.edu/etron/ | Electronics Courses | 
| www.matrixmultimedia.co.uk/ | 'The best course in Electronics' | 
| www.cit.ac.nz/smac/cscourse.htm | Courses in Assembler programming, MCU's etc. | 
| www.techonline.com/ | At Tech Online | 
| www.osee.net/ | OSEE's life Webcast lectures from time to time | 
| www.esacademy.com/ | 
| sales@eptac.com | Sales | 
| Sandra Mayo <sandra@eptac.com> | Vice President of Training | 
| Tom Weaver <tom@eptac.com> | Director of Business Development and Acquisitions | 
| www.eptac.com/ | 
| www.ptiseminars.com/ | 
| www.pti-inc.com/ | 
| www.dsig.com | General | 
| www.teex.com/tedd/ | 
| www.tolu.com/ | TechOnLine University | 
| www.techonline.com/ | TechOnLine University | 
| xDSL Technologies | G. Zimmerman | Pair Gain Technologies, Inc. | 
| Understanding Wireless Communications | Prof. John Proakis | Delphi Communication Systems | 
| Overview of Digital Signal Processing | Prof. Hanoch Lev-Ari | Northeastern University | 
| Theory and Practice of Technical Standards | Ken Krechmer | Communication Standards Review | 
| Analog Devices' DSP Development Environment | ? | ? | 
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