A makeshift high-precision current sensor circuit lab

FAQ | Mar 03,2023

Creating a makeshift high-precision current sensor circuit lab requires a few basic components and tools. Here is a list of what you will need:


  • Op-Amp (Operational Amplifier)
  • Precision shunt resistor
  • Voltage reference
  • Capacitors
  • Resistors
  • Breadboard
  • Jumper wires


  • Multimeter
  • Power supply
  • Oscilloscope (optional)

Here are the steps to create a makeshift high-precision current sensor circuit lab:

  1. Choose an op-amp with high gain and low offset voltage. The op-amp will amplify the voltage signal from the shunt resistor, which will be proportional to the current being measured.
  2. Choose a precision shunt resistor with low resistance and low temperature coefficient. The shunt resistor will be placed in series with the current being measured, and the voltage across it will be amplified by the op-amp.
  3. Choose a voltage reference with high accuracy and low noise. The voltage reference will be used as a stable voltage source for the op-amp.
  4. Calculate the values of resistors and capacitors needed for the op-amp circuit, which will depend on the specific op-amp being used. The circuit should be designed to have high gain, high bandwidth, and low noise.
  5. Build the circuit on a breadboard, following the schematic diagram of the op-amp circuit.
  6. Connect the circuit to a power supply and a multimeter. Apply a known current to the shunt resistor and measure the voltage across it with the multimeter. Adjust the gain of the op-amp to obtain the desired output voltage range.
  7. Optionally, use an oscilloscope to measure the output signal of the circuit and verify that it has the desired bandwidth and low noise.

By following these steps, you can create a makeshift high-precision current sensor circuit lab that can be used for measuring small currents with high accuracy. Keep in mind that the accuracy of the circuit will depend on the quality of the components used and the calibration of the circuit.

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