Figure 7.5. On the left the lower input terminal is grounded. The upper input terminal goes through R1, 10 k ohms, to the inverting input of o eh 1. The noninverting input is grounded. The output goes to the cathode of a diode, D1. The anode of D1 goes to the inverting input. The output of o eh 1 also goes to the anode of D2. The cathode of D2 goes to the output terminal of the circuit. The circuit output goes through R2, 10 k ohms, to the inverting input of O eh 1. The input of the circuit also goes to the noninverting input of o eh 2. The output of o eh 2 goes to the cathode of a diode, D3. The anode of D3 goes to the inverting input. The output of o eh 2 also goes to the anode of D4. The cathode of D4 goes to the output terminal of the circuit. The circuit output goes through R3, 10 k ohms, to the inverting input of O eh 2. There is a 10 k ohm resistor, R4 from the circuit output terminal to ground. The lower output terminal is grounded. End verbal description.
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