محاسبه فرکانس تایمر 555

FFFDSQPLJS

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

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 cycle≥50%

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)