Question 10.6: A 555 timer confi gured to run in the astable mode (oscillat...
A 555 timer configured to run in the astable mode (oscillator) is shown in Figure 10–39 . Determine the frequency of the output and the duty cycle.
f=\frac{1.44}{\left(R_1+2 R_2\right) C_{\mathrm{ext}}}=\frac{1.44}{(2.2 ~\mathrm{k} \Omega+9.4 ~\mathrm{k} \Omega) 0.022~ \mu \mathrm{F}}=5.64~\mathrm{kHz}
\text { Duty cycle }=\left(\frac{R_1+R_2}{R_1+2 R_2}\right) 100 \%=\left(\frac{2.2~ \mathrm{k} \Omega+4.7~ \mathrm{k} \Omega}{2.2 ~\mathrm{k} \Omega+9.4~ \mathrm{k} \Omega}\right) 100 \%=\mathbf{5 9 . 5 \%}
P R A C T I C E EXERCISE
Determine the duty cycle in Figure 10–39 if a diode is connected across R_2 as indicated in Figure 10–38 .
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