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Read the page on
multivibrators first.
The output of the
bistable toggles
(changes state) when its
input receives a pulse.
This means that after
two pulses the output
has returned to its
original state.
If it was originally
low, it has gone high
after the first pulse
and then returned low
after the second.
Looking at the first
diagram, the two input
pulses have provided a
single, wider pulse at
the output.
If we put eight pulses
in then we get four out.
The bistable divides by
two.
If we put a 16 kHz
signal in, we get an 8
kHz signal out.
The bistable acts as a
frequency divider.
If we feed the 8 kHz
into another bistable
the resulting frequency
is 4 kHz.
We can divide a high
frequency signal down to
a lower one.
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