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digital electronics multivibrators and 555 timer
1. Design a circuit using a 74121 to convert a 33-kHz, 30% duty cycle waveform to a 33-kHz, 60% duty cycle waveform.
(A): Rint = 2 k, Cext = 0.012 F
(B): Rint = 2 k, Cext = 0.012 nF
(C): Rint = 4 k, Cext = 0.012 F
(D): Rint = 4 k, Cext = 0.012 nF
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