This circuit is ideal for adding a low cost frequency display to a function generator or other design. I doubt if it is possible to get a cheaper design using off the shelf components!. In fact, I challenge anyone to make a cheaper design using garden variety components!.
The upper frequency limit is dependent upon the upper limit of the 74HC390 chips which is roughly 40MHz.
Here is the design for a very low cost 6-digit frequency counter module using of the shelf components (and not that expensive 74C926!).
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