MASSACHUSETTS INSTITUTE OF TECHNOLOGY 6 071 Introduction to Electronics Signals and Measurement Spring 2006 Laboratory 16 Diodes Signal conditioning Exercise 1 Use the I V instrument to measure the I V characteristics of a diode from your labkit The zoom feature will give you the opportunity to investigate in detail all regions of the curve Exercise 2 Build and test a full wave rectifier circuit For input use the function generator to create a sinusoidal signal with an amplitude of 2 5 Volts and a frequency of 60 Hz Increase the frequency to 1kHz 10kHz 50kHz and observe the resulting output 22 071 6 071 Spring 2006 Page1 Exercise 3 Next let s built analyze and test the following circuit R1 1 3 1k Vin 2 5 R2 Vo R3 4 This circuit is called waveform clipper Resistor R1 is called the current limiting resistor since it limits the current through the diodes What is the role of resistors R2 and R3 Use your function generator to create a triangular wave with an amplitude of 2 5 Volts Measure the output voltage Vo with the oscilloscope and draw its form below You may use a variable resistor in the place of R2 and R3 and observe the output as you trim the resistors 22 071 6 071 Spring 2006 Page2 Exercise 4 Diode logic gates Built and test the following circuits Va Vb 3 Vc Vo R 0 Determine the output for the following values for the voltages Va Vb and Vc This circuit performs the logic operation OR Va 5V 5V 0V Vb 5V 0V 0V 6 Vc 5V 5V 5V Vo 5V R4 Va Vb 7 Vc Vo 0 Determine the output for the following values for the voltages Va Vb and Vc This circuit performs the logic operation AND Va Vb Vc Vo 5V 5V 5V 5V 0V 5V 0V 0V 5V 22 071 6 071 Spring 2006 Page3 Voltage regulator Start this experiment and complete the analysis for Monday The Zener diode with its well defined breakdown voltage may be used for building a very effective voltage regulator In this exercise we will construct and test a voltage regulator circuit supply unregulated voltage 1 Rs 2 D Vs 3 3 V Vz RL The supply is able to provide a maximum current of 1 5A and the Zener diode has an effective resistance of 30 Using Rs 500 and RL 10k build the above circuit From the class web site download the instrument called ZenerRegulator This instrument controls the variable power supply of your ELVIS unit Make the following connections to your protoboard Node 1 Connected to ACH1 measures the unregulated voltage Vs Node 2 Connected to ACH2 measures the regulated voltage Vz Run your instrument and observe the response of the circuit regulated voltage Vz as the unregulated voltage Vs is varied Try adding noise to Vs and observe Vz Note the loading effect of this voltage regulator circuit As Vs gets larger what is the max Vz across the load Given the maximum Vz and the diode s effective resistance calculate the maximum current through the diode Iz What is the maximum current Is 22 071 6 071 Spring 2006 Page4
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