Then the lower part of the output waveform which is below this 0.7v window will not be reproduced accurately resulting in a distorted area of the output waveform as one transistor turns “OFF” waiting for the other to turn back “ON”. The result is that there is a small part of the output waveform at the zero voltage cross over point which will be distorted. This type of distortion is called Crossover Distortion and is looked at later on in this section.
So if you have followed everything so far, we have three separate grounds; the signal return, the power supply return, and the chassis. I find that all must interconnect at a single place to avoid having any conductor contaminated with something from one of the others. I suppose that putting signal on a power conductor would not be likely to cause the power supply any problems, but the reverse results in serious issues.
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