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FFFDSQPLJS

The tool is NE555 frequency online calculator, 555 integrated circuit parameter application calculation.

NE555 frequency online calculator 555 integrated circuit parameter application calculation

Find the output value based on the metacondition

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

R1:
R2:
  C:

T1 Rising edge = second
T2 Falling edge = S
T Total week   =    S
Frequency     =     Hz
Duty cycle   =  % Duty cycle50%

Find the resistance value according to the output conditions Duty cycle ≤50%

Output Frequency Output frequency  [Hz]
Duty Cycle  [%]
Capacitor  [nF]
R1  [kΩ]
R2  [kΩ]

Evaluated according to output conditions or components Duty cycle ≥50%

频率 (KHz)
Duty cycle (%)   Reverse output
R1  (K)
R2 (K)
C (uF)