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digital electronics multivibrators and 555 timer
1. To obtain a 50% duty cycle in an astable 555 timer circuit:
(A): capacitor voltage must rise above 1/3 VCC
(B): RA = RB and short RB with a diode during the capacitor charging cycle
(C): tLO = tHI
(D): tLO = tHI, RA = RB, and short RB with a diode during the capacitor charging cycle
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