Question

Consider the circuit shown below


The output pulse of 220 $\mu s$ is produced by the monostable circuit, then the value of C is ____ nF.

• A. 20

Answer 1

The correct option is A 20
$\text{For monostable 555 IC, timer pulse width is}$

$T=1.1RC$

$\Rightarrow C=\frac{220\times {10}^{-6}}{1.1\times 10\times {10}^3}$

$C=\frac{2200}{11}\times {10}^{-10}$

$C=2\times {10}^{-8}$

$C=20nF$