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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.
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.
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Build your own LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and "Zero Out" function to make sure the readings are as accurate as possible ... [more] |
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