Strictly speaking,
noise is a composite
of a great number of
signals at many, varying
frequencies. It is a
random quantity
which generally has
no regular or repetitive
character.
Although it is usually
an unwanted quantity,
noise may be used to
analyse the performance
of an audio
system. A noise generator
is, therefore,
indispensable for
much work in an
audio workshop.
Unfortunately, many
amateur audio enthusiasts
find the price of
noise generators
beyond their means.
For them, this article
describes an affordable,
small noise generator
that is easy to
build.
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