But the operation of systems is much more easily understood using block diagram, as unnecesary details have been left out. A simple block diagram is shown in Figure 5.1 . A simple block diagram for an audio circuit. Other controls may modify the signal and then a power amplifier is used to drive a loudspeaker. All this is basically described in words that accompany each block.
Amplification means making a copy of a waveform, and the copy is usually larger.
An amplifier block is very likely to be labelled with its gain expressed in decibels. In another example in a certain audio system low level signals from three microphones are mixed together by a mixer which gives a mixed low level signal out. The mixed signal is applied to a power amplifier which provides a high level signal to drive a loudspeaker. The power supply unit converts the ac mains supply voltage to a dc voltage suitable for the system. On the basis of the above description draw the block diagram for the above system.