Adjustable Non-Inverting Op-Amp Design
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Below are the proposed changes that will be applied to your project schematic. These changes are not final until you click the "apply changes" button.
Proposed Schematic Updates:
Table
| Designator | Component & Value | Description & Connections |
|---|---|---|
| U1 | LM358 | Generic dual op amp. Use one op amp for the non-inverting amplifier configuration. |
| R1 | 10 kΩ | Fixed resistor from the U1 inverting (–) input to ground. |
| R2 | Potentiometer 0–100 kΩ | Adjustable feedback resistor connected from U1 output to the inverting (–) input. |
| C1 | 0.1 µF decoupling capacitor | Connected between U1 V+ (power) and ground to improve stability (placed adjacent to U1). |
| TP1 | Test point | Node at U1 output for connecting both the Arduino A0 and the oscilloscope probe. |
| ARDUINO | Arduino (assumed 5V supply and analog input A0) | U1 V+ will be tied to the Arduino’s +5V supply. The U1 output (via TP1) connects to the Arduino analog input (A0). |
| GND | Common Ground | All components (U1, R1, R2, C1, Arduino, oscilloscope) share a common ground. |
| IN | Input Signal | Input node feeding the U1 non-inverting (+) pin. |
Schematic Connection Overview:
-
Power & Decoupling:
- U1 V+ is connected to +5V from the Arduino.
- Place decoupling capacitor C1 (0.1 µF) between U1 V+ and GND.
- U1 ground is connected to the common ground.
-
Op Amp Configuration:
- The input signal is routed into the non-inverting (+) input of U1.
- The inverting (–) input of U1 is connected to ground through the fixed resistor R1 (10 kΩ).
- A potentiometer (R2, 0–100 kΩ) is connected between U1 output and its inverting (–) input.
-
Output Connections:
- U1 output is connected to a test point (TP1). From TP1:
- One branch connects to the Arduino analog input (A0) for voltage measurements.
- Another branch provides a connection point for the oscilloscope probe.
- Ensure the output voltage remains within the Arduino's ADC range (0–5V).
- U1 output is connected to a test point (TP1). From TP1:
-
Common Ground:
- All grounds (op amp, Arduino, and oscilloscope) are connected together.
If this fully meets your experimental setup for measuring how the gain changes with the adjustable feedback resistor, please click the "apply changes" button to update your project schematic with these modifications.
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