EE331LE2rev6 - Experiment-2 Experiment-2 Diode Circuit...

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Experiment-2 R. B. Darling EE-331 Laboratory Handbook Page E2.1 Experiment-2 Diode Circuit Applications Introduction The objectives of this experiment are to observe the operating characteristics of several very common diode circuits and the effects of non-ideal diode characteristics on their performance. Precautions None of the devices used in this set of procedures are particularly static sensitive; nevertheless, you should pay close attention to the circuit connections and to the polarity of the power supplies, diodes, and oscilloscope inputs. Some of the capacitors are electrolytics which are polar capacitors and must be installed in the correct polarity in order to function properly. Comment Many of the procedures in this experiment will utilize the ± 6.3 VAC laboratory transformer as the signal generator for the circuits. You may wish to set up the input to your solderless breadboard so that the transformer output is always introduced at the same end of the breadboard, e.g. from the left. Procedure 1 Voltage clipper circuits Set-Up Using the solderless breadboard, construct the circuit shown in Fig. E2.1 using the following components: R1 = 10 k 5% 1/4W D1 = 1N4148 Figure E2.1 R1 10 k WHITE SCOPE GND (Y) SCOPE CH-2 BLACK (X) SCOPE CH-1 D1 1N4148 VS LAB XFMR DC SUPPLY VBB Turn the power switch OFF on the laboratory transformer and plug the unit into a 120 VAC line receptacle. Connect the transformer to the circuit board using leads from the black and white banana jacks as shown in Fig. E2.1.
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Experiment-2 R. B. Darling EE-331 Laboratory Handbook Page E2.2 This will apply a 10 V peak sinewave to the circuit once the power is turned on. Configure a DC power supply to implement the VBB DC source in Fig. E2.1. Use a pair of squeeze-hook test leads to connect the output of the power supply to your breadboard. Initially adjust the output of the DC power supply to zero. Connect a 10 × probe to the BNC connectors on each of the two input channels of an oscilloscope. Connect the probe from Ch-1 to the free end of R1 to monitor the input signal, and connect the probe from Ch-2 to the node between R1 and D1 to monitor the output signal, as shown in Fig. E2.1. Configure the oscilloscope to display both channels with a vertical scale of 5 V/div, which includes the attenuation of the 10 × probe. Set the input coupling of both channels to DC, and make sure that channel-2 is not inverted. Set the timebase to 5 ms/div. Set the trigger mode to AUTO with a source of Ch-1. Finally center both traces on the center of the screen by switching the input coupling for each channel to GND, moving each trace to the center hairline of the screen using the position controls, and then returning the input coupling switches to the DC position. Measurement-1
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EE331LE2rev6 - Experiment-2 Experiment-2 Diode Circuit...

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