Prelab Lecture 3

Prelab Lecture 3 - Lecture 3 Goals: Estimation of Thevenin,...

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Lecture 3 Goals: • Estimation of Thevenin, Norton Parameters • Constant Current Source • Thevenin Equivalent of Transistor Dimmer
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2 Lab Practical Checklist b Breadboard a circuit consisting of resistors, transistors, Op-Amps, and LEDs. b Measure current and voltage using the DMM. b Create a sinusoid given specifications of V PP , V RMS , frequency. b Measure frequency and DC/AC voltages using an oscilloscope. b Manage your time. http://www.ece.arizona.edu/~seamusb/BREADBOARD%20EXAMPLES.pdf
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3 Transistor Pins e b c e mitter b ase c ollector •Transistor in a TO-18 Package. • SUGGESTION: first identify pins, place transistor in the breadboard, and then build the circuit around transistor.
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4 PART 1: Estimating R Th and R N from Load Parameters + - Vth RL 2 1 Rth 2 1 0 RL 2 1 Rn 2 1 0 In Thevenin Source Norton Source (a) Find R Th in terms of R L and V Th / V L (b) Find an expression for I L h Take the derivative of I L with respect to R L dI L /d R L h Show when R N >>R L , I L is only a function of I N and R N L V + L I
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Prelab Lecture 3 - Lecture 3 Goals: Estimation of Thevenin,...

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