Digital Electronics - Multivibrators and 555 Timer - Discussion

Discussion :: Multivibrators and 555 Timer - General Questions (Q.No.35)


The pulse width out of a one-shot multivibrator increases when the:

[A]. supply voltage increases
[B]. timing resistor decreases
[C]. UTP decreases
[D]. timing capacitance increases

Answer: Option A


No answer description available for this question.

Manu M. said: (Aug 20, 2013)  
Is this the right answer? What if the timing capacitance increased? The equation is T = 1.1 RC.

That means pulse width is proportional to the resistance and Capacitance only.

Hence if the value of capacitor increased, pulse width increases and supply voltage has no relation with it.

Mikki said: (Aug 15, 2014)  
I thought so it was the capacitor. But there is also an equation related with time. Vc= Vm(1-e^-t/RC) i guess its because of this equation?

Shams said: (Jul 22, 2019)  
The answer is D, the pulse width = 0.69RC.

Athira said: (Jul 14, 2020)  
Correct answer is D.

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