
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Transcribed Image Text:### Node Analysis and Op-Amp Circuit Explanation
#### Objective:
To determine the model equation for \( V_{\text{out}} \) in terms of \( V_{\text{pot}} \) using node analysis, and calculate \( V_{\text{out}} \) for each value of \( V_{\text{pot}} \).
#### Circuit Description:
The circuit comprises a power source, resistors, a potentiometer, and an operational amplifier (op-amp).
- **Power Source:** 9V DC supply.
- **Resistors:**
- \( R9 = 10k\Omega \)
- \( R8 = 1k\Omega \)
- \( R7 = 10k\Omega \)
- \( R6 = 1k\Omega \)
- **Potentiometer:** \( \text{SET} = 0.5 \), which determines the wiper position for \( V_{\text{pot}} \).
- **Op-Amp Configuration:**
- Non-inverting terminal (+) connected to \( V_{\text{pot}} \) through \( R8 \).
- Feedback is provided from the output \( V_{\text{out}} \) through \( R6 \) to the inverting terminal (-).
- Additional feedback through \( R7 \).
#### Procedure:
1. **Node Analysis:**
- Apply Kirchhoff's laws to find relationships between voltages and currents in the circuit.
- Use the properties of the op-amp, assuming ideal conditions \( V_{\text{+}} = V_{\text{-}} \).
2. **Equation Derivation:**
- Use the voltage divider rule for \( V_{\text{pot}} \) and apply gain equations for the op-amp to find \( V_{\text{out}} \) in terms of \( V_{\text{pot}} \).
3. **Calculation:**
- Substitute different values of \( V_{\text{pot}} \) to obtain corresponding \( V_{\text{out}} \).
### Key Concepts:
- **Op-Amp Properties:** In an ideal op-amp, the input impedance is infinite, and the output is driven to balance the input differential voltage, resulting in \( V_{\text{+}} = V_{\text{-}} \).
- **Voltage Divider Rule:** Used to calculate \( V_{\text{pot}} \) from the potentiometer configuration.
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