LM321 SOT23-5

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2.instrumentation amplifier

The circuit in the figure above performs the same function, but the input is high impedance.

3.Low pass active filtering

The low-pass filter circuit shown here has a (-R2 / R1) DC gain and -3db at a frequency of 1/2 PI

R2C corner. Make sure the filter is within the amplifier's bandwidth. Large feedback resistors are

easily accompanied by parasitic capacitance at high speed, resulting in adverse effects such as

oscillation. Keep the resistance value as low as possible and consider the appropriate output load.