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Find tH, tL, DC and f of a clock generator circuit implemented with the CI 555...

Find tH, tL, DC and f of a clock generator circuit implemented with the CI 555 and the following components:

C1 = 22n (0.000000022F)
R1 = 10k (10000Ω)
R2 = 4k7 (4700Ω)
        tL = ln(2)*R2*C1
        tH = ln(2)*(R1+R2)*C1
        f(Hz) = 1/(tH + tL) = 1/[ln(2)*(R1+2R2)*C1]
        DC(%) = [tH/(tH + tL)] * 100% = [(R1+R2)/(R1+2R2)] * 100%
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