Online tools "Calculators"

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Frequency Wavelength Calcualtor: http://www.csgnetwork.com/freqwavelengthcalc.html

Unit Conversion : http://www.unitconversion.org/index.html

Multi layer air core inductor calculator: http://www.circuits.dk/calculator_multi_layer_aircore.htm

LC and other usefull Calculators: http://radiocalculators.foxdelta.com

Some more Electronic Calculators: http://www.electronics2000.co.uk/calc/

Cylinder Area: http://www.easycalculation.com/area/cylinder.php

Parts DataSheets: http://www.alldatasheet.com/view.jsp?Searchword=lm311

Parallel Plate Capacitor Calculator: http://www.daycounter.com/Calculators/Plate-Capacitor-Calculator.phtml

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Frequency Wavelength Calcualtor: http://www.csgnetwork.com/freqwavelengthcalc.html

Unit Conversion : http://www.unitconversion.org/index.html

Multi layer air core inductor calculator: http://www.circuits.dk/calculator_multi_layer_aircore.htm

Thanks, Claudio.
The last one of the multi layer is very nice!

br
Steve