Determining the frequency response of an amplifier normally requires a series of carefully conducted test measurements, a large supply of graph paper, and plenty of patience. Wrestling with peak-peak values, RMS voltages, dBs, logarithms etc. can prove to be something of a chore, and it is all too easy to make mistakes which `distort` the final results. However if one possesses an oscilloscope, there is a way of displaying frequency response curves directly upon its screen -provided one also has the instrument described here, namely a sweep generator.
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