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university:courses:electronics:electronics-lab-26 [23 Mar 2017 15:46] – [Materials:] Doug Mercer | university:courses:electronics:electronics-lab-26 [05 Mar 2019 10:57] – [Questions:] Antoniu Miclaus |
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===== Directions: ===== | ===== Directions: ===== |
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Build the circuit shown in figure 1 on your solder-less breadboard using the 1N4735 6.1 volt zener diode. Use AWG1 and the -5V Vn user supply to establish the DC supply V<sub>IN</sub>. Use various fixed and variable resistors for R<sub>L</sub>. | Build the circuit shown in figure 1 on your solder-less breadboard using the 1N4735 6.1 volt zener diode. Use AWG1 (5V constant) and the -5V Vn user supply to establish the DC supply V<sub>IN</sub>. Use various fixed and variable resistors for R<sub>L</sub>. |
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{{ :university:courses:electronics:a26_f1.png?600 |}} | {{ :university:courses:electronics:a26_f1.png?600 |}} |
<WRAP centeralign> Figure 1 Zener Diode regulator </WRAP> | <WRAP centeralign> Figure 1 Zener Diode regulator </WRAP> |
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===== Measurements: ===== | Hardware Setup: |
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1. Monitor and report the load voltage V<sub>L</sub> by using the Waveforms Voltmeter instrument to measure V<sub>L</sub> for R<sub>L</sub> equal to:\\ | {{ :university:courses:electronics:zener_reg-bb.png |}} |
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| <WRAP centeralign> Figure 2 Zener Diode regulator Breadboard Circuit </WRAP> |
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| ===== Procedure: ===== |
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| 1. Monitor and report the load voltage V<sub>L</sub> by using the Scopy Voltmeter instrument to measure V<sub>L</sub> for R<sub>L</sub> equal to:\\ |
* Open circuit\\ | * Open circuit\\ |
| {{ :university:courses:electronics:zener_reg-wav1.png |}} |
| <WRAP centeralign> Figure 3 R<sub>L</sub> = Open Circuit Zener Diode regulator waveform </WRAP> |
* 10 kΩ\\ | * 10 kΩ\\ |
| {{ :university:courses:electronics:zener_reg-wav2.png |}} |
| <WRAP centeralign> Figure 4 R<sub>L</sub> = 10kΩ Zener Diode regulator waveform </WRAP> |
* 1 kΩ\\ | * 1 kΩ\\ |
| {{ :university:courses:electronics:zener_reg-wav3.png |}} |
| <WRAP centeralign> Figure 5 R<sub>L</sub> = 1kΩ Zener Diode regulator waveform </WRAP> |
* 100 Ω\\ | * 100 Ω\\ |
| {{ :university:courses:electronics:zener_reg-wav4.png |}} |
| <WRAP centeralign> Figure 6 R<sub>L</sub> = 100Ω Zener Diode regulator waveform </WRAP> |
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2. Replace the load R<sub>L</sub> with a 5KΩ potentiometer, and adjust the potentiometer to determine the minimum value of R<sub>L</sub> for which V<sub>L</sub> remains within 10% of the zener voltage V<sub>Z</sub>. Measure and report the resistance you set the potentiometer to. How does this resistance relate to the value of R<sub>S</sub>? | 2. Replace the load R<sub>L</sub> with a 5KΩ potentiometer, and adjust the potentiometer to determine the minimum value of R<sub>L</sub> for which V<sub>L</sub> remains within 10% of the zener voltage V<sub>Z</sub>. Measure and report the resistance you set the potentiometer to. How does this resistance relate to the value of R<sub>S</sub>? |
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Add questions here: | Add questions here: |
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| <WRAP round download> |
| ** Resources: ** |
| * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/fritzing/zener_reg_bb | zener_reg_bb]] |
| * LTSpice files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/ltspice/zener_reg_ltspice | zener_reg_ltspice]] |
| </WRAP> |
===== For Further Reading ===== | ===== For Further Reading ===== |
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