Frequency Counter: Divider Schematic
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The divider design is pretty self-explanatory. One can choose between
division by 1, 10 or 100 or no output (tied low) using the
CONTROL input connected to the analog multiplexer HC4052.
AC04are used to drive 3 indication LEDs as
well as to buffer the signal. A single HC390 includes 2 divider
by 2 and 5 which can be combined as 2 dividers by 10.