1. In the following Astable Multivibrator circuit, which properties of Vo(t) depend on R2 ?
a. Only the frequency
b. Only the amplitude
c. Both the amplitude and the frequency
d. Neither the amplitude nor the frequency
Solution: https://www.youtube.com/watch?v=CNrhstw1lQI
2. In the circuit shown below, the OP-AMP is ideal, the transistor has VBE = 0.6 volts and β = 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of the OP-AMP.
a. Positive feedback, V = 10 Volts
b. Positive feedback, V = 0 Volts
c. Negative feedback, V = 5 Volts
d. Negative feedback, V = 2 Volts
Solution: https://www.youtube.com/watch?v=H6FpEgr7ZYI
3. A small signal source Vi(t) = Acos20t + Bsin106t is applied to a transistor amplifier as shown below. The transistor has β = 150 and hie = 3 KΩ. Which expression best approximate Vo(t).
a. Vo(t) = - 1500 (Acos20t + Bsin106t)
b. Vo(t) = - 150 (Acos20t + Bsin106t)
c. Vo(t) = - 1500 (Bsin106t)
d. Vo(t) = - 150 (Bsin106t)
Solution: https://www.youtube.com/watch?v=C-1mKYDJhY4
a. Only the frequency
b. Only the amplitude
c. Both the amplitude and the frequency
d. Neither the amplitude nor the frequency
2. In the circuit shown below, the OP-AMP is ideal, the transistor has VBE = 0.6 volts and β = 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of the OP-AMP.
a. Positive feedback, V = 10 Volts
b. Positive feedback, V = 0 Volts
c. Negative feedback, V = 5 Volts
d. Negative feedback, V = 2 Volts
3. A small signal source Vi(t) = Acos20t + Bsin106t is applied to a transistor amplifier as shown below. The transistor has β = 150 and hie = 3 KΩ. Which expression best approximate Vo(t).
a. Vo(t) = - 1500 (Acos20t + Bsin106t)
b. Vo(t) = - 150 (Acos20t + Bsin106t)
c. Vo(t) = - 1500 (Bsin106t)
d. Vo(t) = - 150 (Bsin106t)
thanx
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