Comments in this procedure each student should

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Unformatted text preview: istors, you will discover that the base current, ib, is "small". When someone says "small" like that, what is really meant is ib is approximately zero. Zero current is an open circuit. So you see that both of the extra connections can be treated as open circuits when computing the bias voltage, and R1 and R2 are a voltage divider for this purpose. This is a good example of how the ideal configurations we study in basic circuit theory are "hidden" in real circuits, and how knowledge of the component behavior can be used to make approximations that reduce the real circuit to a simpler one. A large part of engineering knowledge is learning when approximations are valid, and when they are not. Set up • Design a voltage divider using the set of resistors supplied with the lab kit to obtain a value of vb = 4.85 V. Get as close to this value as you can. • • • Ensure that the current through the voltage divider is greater than 0.1 mA (this keeps the "ib is small" approximation true). Ensure that no resistor is overloaded (dissipates power greater than its power rating). Implement your design (just the voltage divider part!) on your breadboard. Measurements and Questions: 5. a (13 points) • Record your design (draw circuit and label values) and vol...
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This note was uploaded on 11/12/2012 for the course EE 215 taught by Professor Davis during the Spring '12 term at University of West Georgia.

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