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Frequency Counter( Mine Worked Up to 70MHz) Using PIC 16F628A (with Prototype PCB and Built in Crystal Oscillator) for HAM Shacks : 5 Steps - Instructables
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ProjectPiles.Com: Frequency counter or Frequency meter using PIC16F628 Project - Your Project Resource
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Amazon.com: Frequency Meter Based on PIC microcontroller Crystal Oscillator Tester Module Kit DIY Frequency Meter : Industrial & Scientific
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