IK3OIL 16F84 PIC Frequency Counter
Frequency counter built by Wayne McFee. This is from IK3OIL’s web site, and the cost of the counter was about $2, minus the display, which was about $7.Design and Code by Francisco IK3OIL.McFee writes:
This frequency counter was mentioned on the QRP-L mailing list.
I offered to put up some more information on the counter on this web page.
I have not built one (yet) nor do I have any further information than what is here.

   IK3OIL 16F84 PIC Frequency Counter
For more detail IK3OIL 16F84 PIC Frequency Counter website
kl7r.ham-radio.ch