Chapter 12. Experiment 12: A Functional Amplifier
As you saw in Experiment 10, an LM741 is not appropriate to drive a loudspeaker, even through a 2N2222 transistor. Really the LM741 is intended to be a bare-bones preamplifier, which increases the voltage from a very small input signal but cannot deliver significant power. A preamplifier is often referred to as a “preamp.”
Fully-featured preamplifiers used to be available in the consumer-electronics world as standalone devices, to amplify inputs from a tape deck, a microphone, or a phonograph cartridge. They included some adjustments for volume, bass, and treble, and then passed the signal along to a power amplifier, which was designed to drive loudspeakers. Today a preamplifier and a power amplifier ...
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