Useful software, applets, mobile apps, and calculators.

eCalc Scientific Calculator



eCalc was formerly its own product/website but more recently has been incorporated into the EEWeb collection of engineering tools. It is a streamlined multi-function calculator, with unit conversion and several built-in scientific constants, that can be customized to suit the users preferences (including RPN operation!). The free online version runs without any special plug-ins required. Downloadable versions can be purchased for Windows and Mac OS (free trial available).

PCB Design Toolkit


Saturn PCB Design, Inc.

Software for Windows PC's with multiple calculators for PC board parameters.

The Saturn PCB Toolkit is the best resource for PCB related calculations you can find.
It incorporates many features that PCB designers and engineers are in regular need of like current capacity of a PCB trace, via current, differential pairs and much more. Please download our PCB Toolkit today for free and enjoy!

Pasternack RF Calculators and Conversions



Pasternack's website offers a large selection of RF calculators and converters available for free for general use.

Pasternack's RF calculators and conversions section provides engineers valuable and easy-to-use tools ranging from complex mathematical formulas to simple conversions. Our RF and microwave calculators and converters will provide the figures you need for your radio frequency engineering needs. RF calculations and RF conversions include metric-standard, link budget, coax cable, power, attenuation, frequency and many more.

FM Modulation Tutorial Applets


Circuit Design Inc. (Japan)

This tutorial and accompanying applet allow you to experiment with FM parameters and see the results at different stages of demodulation. Of particular interest is the applet showing the output spectrum for an adjustable modulation index, based on the values of the Bessel functions for the various sidebands.

Wave on a String Demo


Michael Dubson/Univ. of Colorado

This interactive demo allows you to experiment with waves and reflections under various conditions. The demonstration shows mechanical waves but the concepts are analogous to EM waves on transmission lines.

Watch a string vibrate in slow motion. Wiggle the end of the string and make waves, or adjust the frequency and amplitude of an oscillator. Adjust the damping and tension. The end can be fixed, loose, or open.


Subscribe to RSS - Software/Calculator