An excellent way to study an electronic circuit is to examine the signal or voltage waveform at various points in the circuit, as displayed on an oscilloscope. Therefore, in this book emphasis will be placed on a detailed study of these waveforms, often called traces. In order to get the most information concerning the operation of an electronic circuit, it is useful to display two or more voltage waveforms at different points in the circuit simultaneously. The use of dual-beam oscilloscopes permits one to do this. Another technique, usable with or without the above, is to photograph the waveforms, making multiple exposures on the same print. This technique was used with a dual-beam oscilloscope by the author in preparing the photographs of waveforms presented in this book.
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