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Now
we know a little bit more about sound and the speaker, I will now try to
explain a little about the amplifier and its purpose and proper installation.
The signal
first comes from a radio, tape, CD player or some other source. The signal
on the original magnetic or digital signal is very, very low at first,
in the milli-volt range. It then is pre amplified which increases the signal
voltage from the milli-volt range up to 1-4 volts or so.
These signals
are from 5 hz up to 40 khz on some systems and
from 20 hz to 20 khz on most others.
The
signal is then connected to RCA cables to the inputs of the amplifier where
many things happen inside that heat sinked hunk of aluminum and electronic
parts.
Lets take
a look at this signal.
The wave
you just looked at is very small at first, the amplifier gives this wave
a very high amplitude.
The MOS-FET
transistor is most often used over any other transistor. It's efficient
and runs cooler. This is a three legged device, one leg is used to
inject the signal to be amplified.
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