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.
The Small Signal Amplifier is generally referred to as a “Voltage” amplifier because they usually convert a small input voltage into a much larger output voltage. Sometimes an amplifier circuit is required to drive a motor or feed a loudspeaker and for these types of applications where high switching currents are needed Power Amplifiers are required.
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