EET2222 – Electronic Devices and Circuits Lab

Lab 3

Diode Rectifiers and Power Supplies

Part I – Half-Wave Rectifier

1. Set up the circuit below and observe the source voltage and the load voltage V_L on the oscilloscope (use dual trace). Make sure that the average value of the source voltage is set to 0 V (use a DC voltmeter to measure it, while adjusting the "DC offset" control on the generator). Adjust the Volts/Division control so that your waveforms are as large as possible without deflecting the trace off the scope screen, adjust the time/division to show two cycles of the waveform. Sketch your scope view of the source and load voltages (label each axis with units and calibration numbers).

2. Measure the DC voltage across the 1 k ohm resistor using the DMM.

3. Calculate the DC voltage from your scope measurement of V_p.

4. Compare your measurements with your calculations.

Part II – Full-Wave / Bridge Rectifier

5. Set up the circuit below and repeat steps 1 through 4.

Part III – Full-Wave Rectifier

6. Set up the circuit below and repeat steps 1 through 4 (use half of the transformer secondary voltage as the source voltage e_s).

7. Connect a 100 µF capacitor across the load resistor in the above circuit (observe polarity for the capacitor). Measure V_PR, V_dc, and the peak to peak ripple voltage
(V_p-p) for the circuit above. Calculate the percent ripple from:

Sketch V_L. Label each axis with suitable units and calibration points.

Your report is due at the end of the period. Please use the green engineering paper.