Figure 7.2. The top input terminal goes to the noninverting input of O eh 1. The bottom input terminal goes to the noninverting input of o eh 2. The output of O eh 1 goes through R2 then through R1 then through another resistor also labeled R2 to the output of o eh 2. We will distinguish between the two R2s by referring to the one connected to o eh 1 as the upper R2 and the one connected to o eh 2 as the lower R2. There is a resistor connected to the junction of the upper R2 and R1 which is labeled RS. The other end connects to the inverting input of o eh 1. There is another resistor connected to the junction of the lower R2 and R1 which is also labeled RS. It connects to the inverting input of O eh 2. The output of O eh 1 connects through R3 then R4 to ground. These are the upper R3 and R4. The junction of the upper R3 and R4 connects to the noninverting input of o eh 3. The output of o eh 2 connects through the lower R3 then through R4 to the output of o eh 3. The junction of the lower R3 and R4 connects to the inverting input of o eh 3. The output of o eh 3 connects to the circuit output terminal. End verbal description.
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