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Home Q & A Board Science-Related Homework Help Physics
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irina irina
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Posts: 919
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11 years ago
the frequency is 5 hertz
the capacitance is 10uF
so how do i calculate the resistance?
i dont want to use web calculators for it though i just need the equation to work it out my self

any help will be very much appreciated
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#1
11 years ago
Time High (secs) = 0.693 * (R1 + R2) * C
The negative output is low for T(l) seconds based on this formula:
Time Low (secs) = 0.693 * R2 * C
The frequency is derived by the formula:
Frequency = 1.44 / ((R1 + R2 + R2) * C)

It appears that you should calculate R1&R2 for how long you want to be high and low. Just do some good algebra to rearrange the formula.
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