Current location - Plastic Surgery and Aesthetics Network - Plastic surgery and beauty - I want to make a digital frequency meter and need a feasible shaping circuit with a frequency range of 1Hz~50M.
I want to make a digital frequency meter and need a feasible shaping circuit with a frequency range of 1Hz~50M.

The maximum operating frequency of 555 is only 500KHz. It is recommended that you use high-speed digital integrated circuits as Schmitt triggers. You can use 74AS14, 74F14, and 74AC14, which are all Schmitt trigger-specific chips, each with 6 built-in Schmitt triggers. Note: 7414 and 74LS14 cannot be used as their operating frequency cannot be reached.