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# IC 555 Timer Calculator with formulas & Equations

## IC 555 Timer Calculator with formulas & Equations

IC 555 Timer Calculator with formulas & Equations IC 555 Timer Calculator with formulas & Equations IC 555 Timer Calculator with formulas & Equations

Formulas and Equations for This calculator

Frequency (f) = 1/ [ ln(2) x C x (R1 + 2R2) ]

Frequency (f) = 1.44 / C x (R1 + 2R2) …. Where… 1/ ln(2) = 1.44

TP = ln(2) x C x (R1 x R2)
TP = 0.693 x C x (R1 x R2) …. Where… ln(2) = 0.693

TN = ln(2) x C x R2)
TN = 0.693 x R2 x C …. Where… ln(2) = 0.693

Where;
C = Value of Capacitor in Farads
R1 and 2R2= Value of the Input Resistance
f= Frequency in kHZ
TP = Positive or High Time from each pulse
TN = Negative or Low Time from each pulse

Enter values and click on calculate. Result will display the calculated quantities.

 Enter values:
 Resistance R1: kΩ Resistance R2 kΩ Capacitance (C): µfarads
Result
 Positive Time Interval TP: ms (millisecond) Negative Time Interval TN: ms (millisecond) Frequency ( f ): kHz (kilo Hertz)

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