Discussion Overview
The discussion revolves around a Wheatstone bridge circuit involving a thermistor, focusing on the calculation of voltages V1 and V2 at a temperature of 80 degrees Celsius. Participants explore the implications of thermistor resistance values and op-amp behavior within the circuit.
Discussion Character
- Homework-related
- Technical explanation
- Debate/contested
- Mathematical reasoning
Main Points Raised
- One participant presents a thermistor resistance equation and asks for the voltages V1 and V2 at 80 degrees Celsius.
- Another participant questions the initial resistance value of the thermistor, suggesting it should be 100 kΩ instead of 100 Ω, citing physical impossibilities with the given parameters.
- Some participants agree on the need to correct the thermistor's starting resistance to 100 kΩ.
- There is a discussion about the current draw of op-amps, with one participant noting that they draw zero current due to infinite internal resistance.
- A participant suggests using the Wheatstone Bridge equation to solve for the voltages.
- One participant emphasizes that V1 and V2 should be determined separately as they are independent, except under specific conditions.
- Another participant points out an error in the analysis regarding the shifting of input voltages and its effect on the output voltage.
- One participant shares their calculations for R2 and expresses confusion about the sign of the result, questioning whether the configuration is inverting or non-inverting.
- A later reply provides a simplified approach to calculating R2, indicating a realization of basic electronics principles.
Areas of Agreement / Disagreement
Participants generally agree on the need to correct the thermistor's resistance value, but there are differing views on the analysis of the circuit and the calculation methods for V1, V2, and R2. The discussion remains unresolved regarding the implications of the circuit configuration.
Contextual Notes
Some participants express uncertainty about the assumptions made in their calculations, particularly regarding the behavior of the op-amps and the implications of voltage shifts in the circuit analysis.
Who May Find This Useful
This discussion may be useful for students or individuals interested in circuit analysis, thermistors, and op-amp configurations, particularly in the context of Wheatstone bridge applications.
