Lab5.docx - Electronics Lab 5 Half-Wave Rectifiers...

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10/2/2017 Electronics Lab 5 Half-Wave Rectifiers Introduction In this lab, we studied the characteristics and operations of filter circuits and half- wave rectifiers. Theory The output of each of these circuits will be different. When there is a negative input voltage to the p side of the diode, the diode will be turned off, creating an open circuit. When a capacitor is involved, it will charge up and decay exponentially as it loses voltage. Experiment We looked at the figures 1-3 and created them on the circuit board. First, we created the circuit of Fig. 1 while using a 20-volt peak to peak square wave with a frequency of 60 Hz as the input. This 20-volt square wave held its minimum at
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-10V and maximum at +10V. On our oscilloscope, we viewed the graphs using a 2ms/division speed. The input voltage was 5V. This circuit is a half wave rectifier. Second, we connected the circuit of Fig. 2. We first created this circuit using a 1μF capacitor. After we viewed the oscilloscope, we replaced the capacitor with a 100μF capacitor. Next, we reconnected the circuits of both figure 1 and figure 2, except with observed the oscilloscope projections with a 20-volt peak to peak sine wave, instead of a square wave. This makes it easier for us to observe the voltage ripple. Lastly, we connected the circuit of figure 3. This added a 100Ω resistor, and left the 1kΩ resistor as a load resistor. This was to add an extra filter stage and create a ripple reduction. The actual circuit set up on the bread board is shown.
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