555 Timer R2 Calculator Astable

Calculate R2

This simple 555 timer calculator is for the astable circuit to calculate the resistance R2 in ohms. You must enter the values for the period T, resistor R1, and capacitor C. The period must be in seconds, resistance in ohms, and capacitance in farads.

1 µF0.000001 F
1 nF0.000000001 F
1 pF0.000000000001 F

Find Resistance

Period (seconds):


Capacitance (F):


R1 (Ω):


R2 (Ω):




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