I am making a detection device based on Arduino and MQ137 gas sensor. I want to connect an op-amp circuit between 12 V power supply and Arduino so that Arduino has a stable and interference-free 5 V power supply access. My teacher gave me this reference diagram, but I can't specify how to design it. Can anyone give me some advice?

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  • \$\begingroup\$ Welcome! Your question isn't entirely clear. Can you draw the circuit around the sensor? Do you want to scale the sensor output to 0-5 V for the Arduino? \$\endgroup\$
    – winny
    May 26 at 12:08
  • \$\begingroup\$ Your schematic is just a 1:1 differential amplifier with about a 15:1 voltage divider input, and low pass filters. The labels are confusing, and you need to specify just what the input waveform looks like. \$\endgroup\$
    – PStechPaul
    May 26 at 14:45
  • \$\begingroup\$ It sounds to me like you just need a voltage regulator. \$\endgroup\$ May 26 at 15:36


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