EET-129 LAB 3 RECTIFIERS_23W

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Centennial College *

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129

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Electrical Engineering

Date

Apr 3, 2024

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docx

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9

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Centennial College ELECTRICAL ENGINEERING TECHNICIAN Course: EET-129 Electronics 1 Name(s) (Please Print): Jeremy San Ped ro Student Number(s): 300946762 Date: Click or tap here to enter text. LAB # 3 Rectifiers Objectives: At the end of this lab, the student will be able to: 1- Construct half-wave, full-wave, and bridge rectifier circuits. 2- Compare measured and calculated DC values. 3- Observe and measure each rectifier circuit's output waveforms on the oscilloscope. 4- Plot/ capture the output waveforms of each rectifier circuit. Components needed: Resistors: One 2.2 kΩ Four diodes 1N4004 One transformer, approx. 15 V AC center-tapped (supplied in the lab) NOTE: Be sure to ask your instructor for assistance properly connecting the transformer to the circuit. 1
PROCEDURE: 1- Connect the circuit shown in Fig. 1 (HALF-WAVE RECTIFIER) Fig. 1 2- Measure the AC voltage at the secondary of the transformer. Enter. 29.67V V. 3- Compute using diode second approximation the DC voltage across the load resistor. 12.7 V DC . Show your calculations in the box below. Vp = Square root 2 * Vrms = Square root 2 * 29.67 = 41.96 Vdc =41.96/pi = 13.3V – 0.7 =12.7V 4- Measure the voltage across the load resistor. 12.4V V DC Compare it to your computed value. Difference: 0.3V V DC 2
5- Connect the Oscilloscope so that channel 1 is across the load resistor. The oscilloscope should be set for Channel 1 triggering. Draw the waveform which appears on the display. Label voltage and time on your sketch indicating the setting per division for voltage and time. Note: you can take a picture and write the necessary information on voltage and time on it indicating the setting per division for voltage and time. 6- Connect the circuit shown in Fig. 2. (FULL–WAVE RECTIFIER) Fig. 2 7- Measure the secondary AC voltage of the transformer between the center tap lead and one of the other secondary leads. 14.7 V. 3
8- Compute using diode second approximation the DC voltage across the load resistor. Enter. 5.9V V DC . Show your calculations in the box below. Vp = Square root 2 * 14.7 = 20.78V Vdc = 20.78/ pi =6.6V – 0.7V 5.914V Full wave = 5.914 * 2 =11.8 V 9- Measure the voltage across the load resistor: 12.38 V DC Compare it to your computed value. Difference: 0.6 V DC 10- Connect the Oscilloscope so that channel 1 is across the load resistor. The oscilloscope should be set for Channel 1 triggering. Draw the waveform which appears on the display. Label voltage and time on your sketch indicating the setting per division for voltage and time. 4
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