Shown below is a timer 555 IC circuit
Frequency of the waveform generated by the above circuit is
The circuit shown in figure below represents:
It is just by figure only. But one can also calculate transfer function.
Consider the following feedback pair connection.
Collector current IC is ____________ mA.
If for a given programmable OPAMP, G_{1} is the gain, when only S_{1} is closed and G_{2} is the gain when only S_{2} is closed, then relation between G_{1} & G_{2} is?
When S_{1} is closed G_{1} = 1 it behaves like a voltage follower circuit. When S_{2} s closed
For given RC − Phase shift oscillator, by use of BJT if R_{1} = R_{2} = 10k, R_{c} = 2K, R = 2K, C = 0.01 µF
Q.
What is Minimum value of hfe for possible oscillation?
For given RC − Phase shift oscillator, by use of BJT if R_{1} = R_{2} = 10k, R_{c} = 2K, R = 2K, C = 0.01 µF
Q.
What is frequency of oscillation for circuit?
For a given CE, amplifier if β = 100, I_{C} = 1 mA, R_{S} = 1 KΩ, R_{c} = 5 KΩ, R_{e} = 200 Ω, h_{ie} = 2.5 K.
Q.
Calculate value of voltage gain
For a given CE, amplifier if β = 100, I_{C} = 1 mA, R_{S} = 1 KΩ, R_{c} = 5 KΩ, R_{e} = 200 Ω, h_{ie} = 2.5 K.
Q.
Calculate input impedance seen by source
For the given FET, circuit if
R_{D} = 20 kΩ rd = 50 kΩ
R_{S} = 2 kΩ µ = 50
Q.
Calculate value of v_{0}/v_{s}
For the given FET, circuit if
R_{D} = 20 kΩ rd = 50 kΩ
R_{S} = 2 kΩ µ = 50
Q.
Calculate value of output impedance
The output voltage V_{0} for given circuit is
A MOSFET amplifier circuit is as shown below:
If device parameter K = 15 µA/V^{2}, then value of Transconductance of MOSFET is _________ ms.
The 3terminal linear voltage regulator is connected to a 10 ohm load resistor as shown in figure. If V_{in} is 10 volt, what is power dissipated in the Si transistor.
A sinusoidal oscillator is built using an amplifier of real gain A, infinite input impedance and feedback (β) network is shown in figure. If Z = jX, then what is the value of z_{0}.
Z+Z+Z_{0} =0 ⇒ Z_{0} =  2jX
Shown below is a network, in collector feedback mode.
Q.
The voltage gain Av is ……………., Assume r_{e} =
Shown below is a network, in collector feedback mode.
Q.
The current gain A_{i} is ≈
A power amplifier delivers 250 watt output at 50% efficiency. If ambient temp. is 25°C and maxm allowable junction temp. is 150°C, then what is value of Maximum thermal resistance which can be tolerated.
Numerical Anser type question
Q.
For a BJT, CEmode, Base to emitter capacitance (Cπ) is 10 times the collector to base capacitance (Cµ). If transistor is biased at quiescent collector current ICQ = 1 mA, and its short circuit unity gain frequency is 0.909 M rad/sec, then the value of Cπ is _______ nF.
In voltage reference diodes:
Voltage reference diode means zener diode
What should be values of components R & R2 such that frequency of weinbridge oscillator is 300 HZ, if C = 0.01 µF, R1 = 12 kΩ.
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