40MHz Frequency Counter Module


40MHz Frequency Counter Module

 

40MHz Frequency Counter Module

 


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.

40MHz Frequency Counter Module

Here is the design for a very low cost 6-digit frequency counter module using of the shelf components (and not that expensive 74C926!).



The standard circuit will display directly in Hz (1MHz max), and there is a separate on board divider that will allow you to display directly in KHz (approx 40MHz max). Because the display reads directly in Hz or KHz there is no need for decimal point switching and the associated complexity. There are no switches or controls, simply feed the signal into one of two inputs and you have a direct readout in Hz or KHz.

40MHz Frequency Counter Module

40MHz Frequency Counter Module

40MHz Frequency Counter Module

40MHz Frequency Counter Module


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