Home Electronics Toolbox Electronics Toolbox Useful tools and Calculators for electronic circuits and components. Resistance Resistor Colour Codes Resistor SMD Codes Resistor Ohm's Law Resistor ADC Pi Input Voltage Calculator Resistor Series Calculator Resistor Parallel Calculator Resistor Voltage Divider Calculator Resistor LED Resistor Calculator Capacitance Capacitor Code Calculator Capacitor Series Capacitance Capacitor Parallel Capacitance Other Tools Binary / Decimal / Hexadecimal Converter Period to Frequency Converter