Electronics CAE System
http://www.advancedmsinc.com/cad_page.htm
Complete Schematic Capture and Design Utility
http://www.advancedmsinc.com/creator/logic.htm
VHDL-AMS is a hardware description language supporting the description and simulation of digital, analog, and mixed-signal systems in a single language.
http://www.ici.ru/~webr8/
convert a comercial 120VAC dimmer for use with the stamps PWM output.
http://www.cs.cmu.edu/~RAS/Docs/space/dimmer.html
The Audio Selection Panel allows you to control 4 Transceivers and hear the audio through the built-in loudspeaker and on an external boomset (combination Microphone/ headset).
http://pe2er.nl/ASP/index.htm
This inductively coupled booster requires no power, and has no amplifier to introduce noise of its own. It is easy to construct from common material
http://www.hard-core-dx.com/nordicdx/antenna/loop/inducloop.html
This project is a follow-up to the article A DIY Headphone Amplifier With Natural Crossfeed. The author shows a natural crossfeed filter design with a bass emphasis to compensate for low-frequency cancellation effects.
http://headwize.com/projects/showfile.php?file=meier2_prj.htm
http://www.web-ee.com/Schematics/X%20Ray/xray.htm
Digital Electronics, Boolean Algebra, Transistor Level Schematics, and Stick Diagrams
http://www.geocities.com/cmoslayoutdesign/
http://www.vonl.com/support/faq/loadcoils.cfm