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| university:courses:electronics:electronics-lab-3 [05 Mar 2019 11:03] – [Procedure:] Antoniu Miclaus | university:courses:electronics:electronics-lab-3 [25 Jun 2020 22:07] (current) – external edit 127.0.0.1 |
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| ====== Activity 3. The BJT connected as a diode ===== | ====== Activity: The BJT connected as a diode ===== |
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| ===== Objective: ===== | ===== Objective: ===== |
| ===== Hardware Setup: ===== | ===== Hardware Setup: ===== |
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| The waveform generator should be configured for a 100 Hz triangle wave with 6 volt amplitude and 0 offset. The differential scope channel 2 (2+, 2-) measures the current in the resistor (and in the transistor). Scope channel 1 (1+) is connected to measure the voltage across the transistor. The current flowing through the transistor, is the voltage difference 1+ and 1- divided by the resistor value (1KΩ). | The waveform generator should be configured for a 100 Hz triangle wave with 6 volt amplitude peak-to-peak and 0 offset. The differential scope channel 2 (2+, 2-) measures the current in the resistor (and in the transistor). Scope channel 1 (1+) is connected to measure the voltage across the diode connected transistor. The current flowing through the transistor, is the voltage difference 2+ and 2- (which is the channel 2 voltage) divided by the resistor value (1KΩ). |
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| {{ :university:courses:electronics:npn_diode-bb.png |}} | {{ :university:courses:electronics:npn_diode-bb.png |}} |
| ===== Hardware Setup: ===== | ===== Hardware Setup: ===== |
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| The waveform generator should be configured for a 100 Hz triangle wave with 10 volt amplitude and 0 volt offset. Scope channel 1 (1+) is used to measure the voltage across the transistor. The setup should be configured with channel 2 connected across resistor R<sub>1</sub> (2+, 2-). Both channels should be set to 1 V per division. The current flowing through the transistor is the voltage difference between 2+ and 2- divided by the resistor value (100Ω). | The waveform generator should be configured for a 100 Hz triangle wave with 10 volt amplitude peak-to-peak and 0 volt offset. Scope channel 1 (1+) is used to measure the voltage across the transistor. The setup should be configured with channel 2 connected across resistor R<sub>1</sub> (2+, 2-). Both channels should be set to 1 V per division. The current flowing through the transistor is the voltage difference between 2+ and 2- divided by the resistor value (100Ω). |
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| {{ :university:courses:electronics:pnp_emitter-bb.png |}} | {{ :university:courses:electronics:pnp_emitter-bb.png |}} |
| ===== Directions: ===== | ===== Directions: ===== |
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| Set up the breadboard with waveform generator W1 attached to one end of the series connected resistor R<sub>1</sub> and collector of NPN Q<sub>1</sub> and the base of PNP Q<sub>2</sub> as shown in the diagram. The emitter of Q<sub>1</sub> is connected to ground. The collector of Q<sub>2</sub>is connected to Vn (5V). The first end of Resistor R<sub>2</sub> is connected to Vp (5V). The second end of R<sub>2</sub> is connected to the base of Q<sub>1</sub> and the emitter of Q<sub>2</sub>. Single ended input of scope channel 2 (2+) is connected to the collector of Q<sub>1</sub>. | Set up the breadboard with waveform generator W1 attached to one end of the series connected resistor R<sub>1</sub> and collector of NPN Q<sub>1</sub> and the base of PNP Q<sub>2</sub> as shown in the diagram. The emitter of Q<sub>1</sub> is connected to ground. The collector of Q<sub>2</sub>is connected to Vn (-5V). The first end of Resistor R<sub>2</sub> is connected to Vp (+5V). The second end of R<sub>2</sub> is connected to the base of Q<sub>1</sub> and the emitter of Q<sub>2</sub>. Single ended input of scope channel 2 (2+) is connected to the collector of Q<sub>1</sub>. |
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| {{ :university:courses:electronics:a3_f3.png?500 |}} | {{ :university:courses:electronics:a3_f3.png?500 |}} |
| ===== Hardware Setup: ===== | ===== Hardware Setup: ===== |
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| The waveform generator should be configured for a 100 Hz triangle wave with 8 volt amplitude and 2 volt offset. Scope channel 2 (2+) is used to measure the voltage across the transistor. The current flowing through the transistor, is the voltage difference between scope input 1+ and 1- divided by the resistor value (1K?). | The waveform generator should be configured for a 100 Hz triangle wave with 8 volt amplitude peak-to-peak and 2 volt offset. Scope channel 2 (2+) is used to measure the voltage across the transistor. The current flowing through the transistor, is the voltage difference between scope input 1+ and 1- divided by the resistor value (1K?). |
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| {{ :university:courses:electronics:loweff_vdrop-bb.png |}} | {{ :university:courses:electronics:loweff_vdrop-bb.png |}} |
| ===== Hardware Setup: ===== | ===== Hardware Setup: ===== |
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| The waveform generator should be configured for a 100 Hz triangle wave with 4 volt amplitude and 2V offset. The Single ended input of scope channel 2+ is used to measure the voltage across the transistor. The setup should be configured with channel 1+ connected to display the output of generator W1 and channel 2+ connected to display the collector voltage of Q<sub>1</sub>. The current flowing through the transistor, is the voltage difference between the W1 measured by scope input 1+ and scope input 2+ divided by the resistor value (1KΩ). | The waveform generator should be configured for a 100 Hz triangle wave with 4 volt amplitude peak-to-peak and 2V offset. The Single ended input of scope channel 2+ is used to measure the voltage across the transistor. The setup should be configured with channel 1+ connected to display the output of generator W1 and channel 2+ connected to display the collector voltage of Q<sub>1</sub>. The current flowing through the transistor, is the voltage difference between the W1 measured by scope input 1+ and scope input 2+ divided by the resistor value (1KΩ). |
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| {{ :university:courses:electronics:vbe_multiplier-bb.png |}} | {{ :university:courses:electronics:vbe_multiplier-bb.png |}} |
| <WRAP round download> | <WRAP round download> |
| **Resources:** | **Resources:** |
| * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/fritzing/bjt_diode_bb | bjt_diode_bb]] | * Fritzing files: [[downgit>education_tools/tree/master/m2k/fritzing/bjt_diode_bb | bjt_diode_bb]] |
| * LTSpice files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/ltspice/bjt_diode_ltspice | bjt_diode_ltspice]] | * LTSpice files: [[downgit>education_tools/tree/master/m2k/ltspice/bjt_diode_ltspice | bjt_diode_ltspice]] |
| </WRAP> | </WRAP> |
| ===== Questions: ===== | ===== Questions: ===== |
