Wednesday, September 23, 2015

100MHz frequency counter with LCD display


Update November 26, 2015:
I made a full project with preamp/signal conditioning and power supply with soft on/of switch. It is published here.


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This is the same as the previous frequency counter but the output is on the 16x2 LCD display.
For more details about how it work look here: http://diyfan.blogspot.bg/2015/08/100mhz-frequency-counter.html




Bellow are pictures and short video, showing the frequency counter in action. As my oscilloscope is with only 70Mhz bandwidth, the 110+ MHz signal looks like sinusoidal, but it is probably not.
I generate the test signal with SN74HC00N connected in this way:






Source code and HEX file can be downloaded here: http://bit.ly/FreqC-LCD




7 comments:

  1. Excellent post and wonderful blog, I really like this type of interesting articles keep it you.

    led video screen

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  2. Good afternoon I would like you please tell me what value is the coil L1 FB SMD1206 thanks

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    1. This is simple ferrite bead for limiting the interference between two parts of the circuit. If I recall correctly it was 120Ohm at 100MHz. I am not sure how critical it is as there is also decoupling capacitor near both IC's supply pins, so it should work fine with piece of wire instead the ferrite bead.

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  3. Is it possible for you to share your Eagle component library MyLib1.lbr over here?

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    1. Sorry, my bad - I did not know how to export libraries in Eagle. Now I actually know :)

      Just for reference:
      https://forum.sparkfun.com/viewtopic.php?t=13875

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  4. This comment has been removed by the author.

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