hi guysi i have a timer 555 circuit and I would like to calculate the tolerance, using differentiation method, my supervisor told me based on the formula for the output frequency of ur circuit
f = (1.44/((Ra+2Rb)C))
u can calculate the tolerance of ur circuit using
√dRa^2 +dRb^2+dC^2 = b
i can calculate df/dRa or df/dC but my problem is when i want to replace dRa or dC with numbers i still end up having df, i have one equation one unknown.
i have attached my circuit and my calculation paper, any help would be much appreciated and i know there are some other ways of calculating tolerances but i kinda have to stick to this one .
Best Regards,
shayan
f = (1.44/((Ra+2Rb)C))
u can calculate the tolerance of ur circuit using
√dRa^2 +dRb^2+dC^2 = b
i can calculate df/dRa or df/dC but my problem is when i want to replace dRa or dC with numbers i still end up having df, i have one equation one unknown.
i have attached my circuit and my calculation paper, any help would be much appreciated and i know there are some other ways of calculating tolerances but i kinda have to stick to this one .
Best Regards,
shayan
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