Phys 351 Lab 7

# Phys 351 Lab 7 - Peter Bohlen Lab 7 Diode Circuits Phys 117...

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Peter Bohlen Lab 7, Diode Circuits Phys 117, Lab Section 457, Mondays 5-8 October 4, 2008 Honor Pledge__________________

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Section A: Rectifiers Results and Observations A-1, Diode Half Wave Rectifier In section A-1, a half wave rectifier was built using a 6.3 V transformer, and a 1N4148 diode. The diode was connected in series with a 2.2kOhm, and the voltage was measured across the resistor. The voltage was compared on an oscilloscope, and the difference in voltage was observed. At low values of input voltage, approximately less than .6 Volts, the wave behaved normally. However at input voltages above .6 volts, the output voltage of the peak wave began to get trimmed. The following displays what the input and output voltages looked like above and below .6 Volts. It was observed that at different voltages close to .6 Volts, the shape did not become perfectly flat at the peak, but slowly got cut off, with shorter amplitude. A-2, Full-Wave Rectifier In section A-2, a full wave rectifier was built once again using the 6.3 volt transformer, and 4 diodes. The polarity of the diode was very important in that if the if it
was placed the wrong way, it would cause a short circuit. Also it was important to not ground the transformer across the diodes on the scope because it would also cause a short circuit, and dramatically destroy the diodes. With this in mind, the diodes were carefully checked, and the output waves were observed on the oscilloscope. The two waves observed across each of the outputs, and the combined outputs are shown below. It is seen that in both graphs, the voltage is zero, the flat regions are approximately half a period in length. With the waves combined, the wave looks like the image above, with the combined output, a full rectified wave. A-3, Bridge Rectifier. In section A-3, instead of using four individual diodes, a bridge rectifier was used which has the configuration within it. Using this bridge rectifier, it was verified that it works just like the four discrete diodes. After concluding this, we could safely use this in place of the four diodes in order to save time and diodes. In the first part, a 2.2kOhm resistor and a 10uF capacitor were placed in parallel

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Phys 351 Lab 7 - Peter Bohlen Lab 7 Diode Circuits Phys 117...

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