$$\text { Figure } 19

Question

$$\text { Figure } 19 < 3$$ -If R=1.5$\mathrm { k } \Omega$ and C=256 pF in Figure 19-3 , the f_CO equals_______ A) 41.4 kHz B) 25.7 Hz C) 257 Hz D) 414 kHz

Quizplus · Accepted Answer

From the given circuit in Figure 19-3, we can find the frequency of the oscillator using the formula:

f = 1 / (2πRC√(3-Vo/Vcc))

where Vo is the voltage across the capacitor and is equal to Vcc/2 at the switching point.

Substituting the given values, we get:

f = 1 / (2π x 1.5kΩ x 256pF x √(3-0.5))
f = 414 kHz (approximately)

Therefore, the answer is choice D.

Figure 19<3\text { Figure } 19 < 3 Figure 19<3 -If R=15 kΩ\mathrm { k } \OmegakΩ

$\text { Figure } 19 < 3$ -If R=15 $\mathrm { k } \Omega$