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IC 555 Timer Calculator with formulas & Equations

IC 555 Timer Calculator with formulas & Equations

IC-555-Timer-Calculator-with-formulas-amp-EquationsIC 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
      
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Positive Time Interval TP:     ms (millisecond)
Negative Time Interval TN:     ms (millisecond)
Frequency ( f ):      kHz (kilo Hertz)

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3 comments

  1. Frankly I think that’s abetulosly good stuff.

  2. I am confused about the value for Tn , that this time required for negative cycle , i think that should be 0.676 *( R1+R2) .
    Can you please share the derivation for it .

  3. Danita Marcum

    Kartik, the Tn equation is correct. According to the datasheet for the 555 Timer, astable output, the following formulas are used (this is how the calculator works). Tp = .693 * (Ra + Rb) * C and the Tn = .693 * Rb * C.

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