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