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555 timer frequency calculation - 555 online calculator



Calculation formula:

T2 (off-time) = 0.693 * R2 * C1

T = 0.693*( (R1 + 2R2) * C1)

F = 1/ T

  = 1.44 / ( (R1 + 2R2) * C1)

D = (T1 /(T1+T2))*100

 

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