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Compute RC tau and timings
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Calculate voltage, current, resistance, and power.
Find the right series resistor for an LED circuit.
Calculate output voltage from two divider resistors.
Compute the RC time constant and common charge/discharge times.
Enter R (ohms) and C (farads) to get tau and 1/2/5*tau timings.
Useful for filter design, timing circuits, and prototyping.
