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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