To obtain a 50% duty cycle in an astable 555 timer circuit: – McqOptions

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

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