Figure 6.1. The op amp is symbolized by a triangle. The short side of the triangle is vertical and on the left. The other two sides are of equal length and are about half again as long as the short side. The signal inputs come to the left side. The inverting input is connected about half way between the middle and the top and is marked with a minus sign inside the triangle. The noninverting input is connected about half way between the middle and the bottom and is marked with a plus sign inside the triangle. The positive power supply connection is made to the top right side about half way between the left side and the point. The negative power supply connection is made to the bottom right side about half way between the left side and the point. The output comes off the point on the right. The positive power supply connection goes to the positive of a battery. The negative of this battery goes to ground. The positive end of another battery goes to ground. The negative of this battery goes to the negative power supply connection of the op amp. End verbal description.
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