I tried a lot to figure out but could not find any answer to this question anywhere.
For calculating pulse width in a standard IC 555 astable and monostable configurations we use the following formulas respectively:
T(high) ≈ 0.693(R1 + R2)C1
T = 1.1RC
And for the frequency we use the formula:
F = 1.44/((R1+2R2)C1
I am interested to know how the constants 0.693, 1.1, and 1.44 were derived in the respective calculations?