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PrismKit

RC Time Constant Calculator

Local

Get an RC circuit's time constant, charge curve and cutoff frequency, find R for a target cutoff, or an LC circuit's resonant frequency.

LED Resistor Calculator

Find the series resistor for one or more LEDs, rounded up to a standard E-series value, with its power rating and actual current.

Resistor Calculator

Decode a resistor's color bands into its resistance and tolerance, or the reverse — type a value to get the bands.