HW12 QNo 2 Part 3 4 5 and r any help please

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HW12 QNo 2 Part 3 4 5 and r any help please

MIT 6.002 Circuits and Electronics, Spring 2007
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@theyatin H12P2 LINEAR REGULATOR **NOTE: Due to how these answer fields depend on each other, "H12P2 Linear Regulator" requires all 6 fields to contain answers for the "check" button to work. This means that writing the correct answer in the first two fields can yield a red X if the last part of the problem has not yet been answered. Also, as the last part of this problem is a design problem, the final four responses are related to each other; hence all four responses entered must agree with each other in order to receive a checkmark.** A linear regulator is a widely used electronic device that maintains a constant output voltage regardless of the value of input voltage (as long as it is larger than a certain threshold). The typical schematic for a regulator is the following: The Bipolar Junction Transistor (BJT) is a device that can be modeled with a current controlled dependent sourve and a diode; the gain K depends on the specific BJT being used. For our analysis we will use that model, and therefore the circuit is: The Zener diode, as we studied before, has the following IV characteristic: As part of your job as an engineer, your company has asked you to design a new regulator. Before actually doing the design, let's do some calculations. For your results you may consider the BJT, diode and the amplifier to be ideal (A→∞, Zin→∞, Zout=0). (a) Write an expression for the output voltage (vout) when the input voltage is below the Zener voltage (vinvz and, for now, assume Rz=0. Write an expression for the output voltage as a function of vz and resistances. correct vz⋅R1+R2R2 Now we are ready for the actual design. The goal of your project is to select the appropriate resistances so that the output voltage is 5V±0.1V when the input voltage varies between 10V and 20V. Assume that the Zener diode you are using has a vz=2.5V and Rz=1Ω (Notice Rz is not zero anymore!). (c) What combination of R0, R1 and R2 satisfies the output voltage requirement? incorrect incorrect incorrect (d) What is the minimum efficiency of your regulator if we consider a BJT with K=0.95 and a resistance of RL=100Ω is connected at the output terminal? (Hint: Notice that there are two power inputs to the circuit: the input terminal and the amplifier.)
sorry brother i don't have practical knowledge of apparatuses. ..
:) ok thanks

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Answer to HW12 P2 , c and d c)700 500 500 d) 0.15 put all four and check

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