19th March
written by Todd Harrison

This is (PART 2A & 2B) of the project “Arduino Frequency Display For a Kenwood TS-520S HF Ham Radio”. This part covers small signal amplification of  a 0.2 volt peak-to-peak 5.5 MHz signal into Schmitt triggered NAND gate for cleanup before being cleanly counted by the Arduino. Links to all parts: (PART 1), (PART 2), (PART 3), (PART 4), (PART 5)



Here are the datasheets for the two chips I used in (PART 2)

74HCT132 Quad 2-input NAND Schmitt trigger (PDF)
NE592 video Amplifier (PDF)


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