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Figure 3-21.Current and voltage in a two-input adder
Figure 3-23.Summing amplifier

Neets Module 08-Introduction to Amplifiers
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3-32 Figure 3-22.—Five-input adder. The previous circuits have been adders, but there are other types of summing amplifiers. A summing amplifier can be designed to amplify the results of adding the input signals. This type of circuit actually multiplies the sum of the inputs by the gain of the circuit. Mathematically (for a three-input circuit): If the circuit gain is -10: The gain of the circuit is determined by the ratio between the feedback resistor and the input resistors. To change figure 3-20 to a summing amplifier with a gain of -10, you would replace the feedback resistor (R3) with a 10-kilohm resistor. This new circuit is shown in figure 3-23.






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