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university:courses:electronics:electronics-lab-2 [05 Mar 2019 10:55] – [Activity 2i. Push - Pull Voltage Doubler] Antoniu Miclaus | university:courses:electronics:electronics-lab-2 [23 Aug 2019 11:46] – amplitude peak-to-peak Pop Andreea | ||
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- | ====== Activity | + | ====== Activity: Diode I vs. V curves ====== |
===== Objective: ===== | ===== Objective: ===== | ||
The purpose of this activity is to investigate the current vs. voltage characteristics of a PN junction diode. | The purpose of this activity is to investigate the current vs. voltage characteristics of a PN junction diode. | ||
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====Hardware Setup:==== | ====Hardware Setup:==== | ||
- | The waveform generator should be configured for a 100 Hz triangle wave with 6 volt amplitude and 0 volt offset. The differential input of scope channel 2 (2+,2-) is used to measure the current in the resistor (and diode). The Single ended input of scope channel 1 (1+) is used to measure the voltage across the diode (1- input can be grounded). The Scope should be setup with channel 1 at 500mV per division and channel 2 set also at 500mV per division. The current flowing through the diode, I< | + | The waveform generator should be configured for a 100 Hz triangle wave with 6 volt amplitude |
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===== Hardware Setup: ===== | ===== Hardware Setup: ===== | ||
- | The waveform generator should be configured for a 100 Hz Sine wave with 6 volt amplitude and 0 volt offset. The scope channel 2 (2+) is used to measure the voltage across the load resistor, R< | + | The waveform generator should be configured for a 100 Hz Sine wave with 6 volt amplitude |
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==== Further Exploration: | ==== Further Exploration: | ||
- | Replace the 1N914 diode with a light-emitting diode, or LED. You probably need to increase the AWG1 amplitude to 10V to accommodate the higher forward voltage drop of the LED. | + | Replace the 1N914 diode with a light-emitting diode, or LED. You probably need to increase the AWG1 amplitude to 10V peak-to-peak |
1. How does the waveform for the rectified output compare to your earlier results with the 1N914 diode? By how much does the forward-bias voltage drop increase? | 1. How does the waveform for the rectified output compare to your earlier results with the 1N914 diode? By how much does the forward-bias voltage drop increase? | ||
2. Experiment with the three different waveform shapes while the waveform generator remains set to 100 Hz, pay attention to the brightness of the LED. Discuss your observations of waveform shape and brightness and relate these observations to your measured effective DC values for each waveform shape. | 2. Experiment with the three different waveform shapes while the waveform generator remains set to 100 Hz, pay attention to the brightness of the LED. Discuss your observations of waveform shape and brightness and relate these observations to your measured effective DC values for each waveform shape. | ||
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===== Hardware Setup: ===== | ===== Hardware Setup: ===== | ||
- | The first waveform generator, W1, should be configured for a 100 Hz Sine wave with 6 volt amplitude and 0 volt offset. The second AWG generator, W2, should be configured also for a 100 Hz Sine wave with 6 volt amplitude and 0 volt offset but with the phase set to 180 degrees. The Single ended input of scope channel 2 (2+) is used to measure the voltage across the load resistor. Both scope channels should be set to 500mV per division. | + | The first waveform generator, W1, should be configured for a 100 Hz Sine wave with 6 volt amplitude |
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==== Further exploration: | ==== Further exploration: | ||
- | Replace D< | + | Replace D< |
1. How does the waveform for the rectified output compare to your earlier results with the 1N914 diodes? By how much does the forward-bias voltage drop increase? | 1. How does the waveform for the rectified output compare to your earlier results with the 1N914 diodes? By how much does the forward-bias voltage drop increase? | ||
2. Experiment with the three different waveform shapes while the waveform generator is set to 100 Hz, pay attention to the brightness of the LEDs. Discuss your observations of waveform shape and brightness and relate these observations to your measured effective DC values for each waveform shape. | 2. Experiment with the three different waveform shapes while the waveform generator is set to 100 Hz, pay attention to the brightness of the LEDs. Discuss your observations of waveform shape and brightness and relate these observations to your measured effective DC values for each waveform shape. | ||
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===== Hardware Setup: ===== | ===== Hardware Setup: ===== | ||
- | The waveform generator should be configured for a 100 Hz Sine wave with 6 volt amplitude and 0 volt offset. The scope channel 2 (2+. 2-) is used to measure the voltage across the load resistor, R< | + | The waveform generator should be configured for a 100 Hz Sine wave with 6 volt peak-to-peak |
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==== Further exploration: | ==== Further exploration: | ||
- | Replace all four diodes D< | + | Replace all four diodes D< |
1. How does the waveform for the rectified output compare to your earlier results with the 1N914 diodes? By how much does the forward-bias voltage drop increase? | 1. How does the waveform for the rectified output compare to your earlier results with the 1N914 diodes? By how much does the forward-bias voltage drop increase? | ||
2. Experiment with the three different waveform shapes while the waveform generator is set to 100 Hz, pay attention to the brightness of the LEDs. Discuss your observations of waveform shape and brightness and relate these observations to your measured effective DC values for each waveform shape. | 2. Experiment with the three different waveform shapes while the waveform generator is set to 100 Hz, pay attention to the brightness of the LEDs. Discuss your observations of waveform shape and brightness and relate these observations to your measured effective DC values for each waveform shape. | ||
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===== Hardware Setup: ===== | ===== Hardware Setup: ===== | ||
- | The first waveform generator should be configured for a 100 Hz Sine wave with 6 volt amplitude and 0 volt offset. The second waveform generator should be configured with 0 amplitude and 0 offset to start. The offset of the second generator will be varied and the effect on the output signal observed. Scope channel 2 (2+) is used to measure the clamped / limited voltage and should be set to 500mV/ | + | The first waveform generator should be configured for a 100 Hz Sine wave with 6 volt peak-to-peak |
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===== Directions: ===== | ===== Directions: ===== | ||
- | Set up the breadboard with W1 attached to one end of the 1.0uF capacitor as shown in figure | + | Set up the breadboard with W1 attached to one end of the 1.0uF capacitor as shown in figure |
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===== Hardware Setup: ===== | ===== Hardware Setup: ===== | ||
- | The first waveform generator should be configured for a 1KHz Sine wave with 2 volt amplitude and 0 volt offset to start. The offset will be varied and the effect on the output observed. | + | The first waveform generator should be configured for a 1KHz Sine wave with 2 volt amplitude |
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<WRAP centeralign> | <WRAP centeralign> | ||
- | Replace diode D< | + | Replace diode D< |
Now remove the 10KΩ resistor and put diode D< | Now remove the 10KΩ resistor and put diode D< | ||
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===== Directions: ===== | ===== Directions: ===== | ||
- | Set up the breadboard with the first waveform generator attached to one end of the 0.1uF capacitor as shown in figure | + | Set up the breadboard with the first waveform generator attached to one end of the 0.1uF capacitor as shown in figure |
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===== Hardware Setup: ===== | ===== Hardware Setup: ===== | ||
- | Waveform generator W1 should be configured for a 10KHz Sine wave with 200 mV amplitude (or less) and offset set to 0. The set scope channel 1+ at 100mV per division and scope channel 2+ connected R4 at 100mV per division. Set the measurements tab to display Ch1 peak-peak and Ch2 peak-peak. | + | Waveform generator W1 should be configured for a 10KHz Sine wave with 200 mV peak-to-peak |
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