Draw a schematic from a PCB obtained from the instructor or use the above picture of the PCB. The dark lines are copper traces. Note that your schematic should have 2 op-amps, 6 Resistors, 2 inputs (Vlin & V2in), 1 output (Vout), Power (VCC, same as 12V) and ground (GND). Label all components and pin numbers. To find the pin numbers of the 2 op-amps, obtain the datasheet for the 8-pin LM358 IC (just google "LM358 datasheet"). Below are circuit symbols to use in your schematic.

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Operational Amplifier

An operational amplifier also called op amp is an integrated circuit or analog circuit that takes input as a differential voltage and produces output as a single-ended voltage. It is an IC that can amplify weak electric signals.An op amp has one output pin and two input pins. The basic role of an opamp is to amplify the voltage difference between the two input voltages. It is also used in filtering or to perform mathematical operations or in signal conditioning.