Electronics calculators for easily solving in circuit calculations
Of particular intrest to the group would be
snubber design calc: http://www.daycounter.com/Calculators/Snubbers/Snubber-Design-Calculator.phtml
How to wire an LED, Tutorial and Calculator: http://www.daycounter.com/Calculators/LED-Tutorial-Calculator.phtml
Voltage Divider Calculator: http://www.daycounter.com/Calculators/Voltage-Divider-Calculator.phtml
and the Adjustable Voltage Regulator Resistor Divider Calculator: http://www.daycounter.com/Calculators/Voltage-Regulator-Resistor-Divider-Calculator.phtml