Circuit diagram of digital tachometer composed of ICL7106

Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle

When the magnetic steel and the Hall sensor coincide, the Hall sensor outputs a low level, and the signal is shaped by a non-gate to form a pulse, and then the frequency is converted into an analog voltage output by the ADVFC32, and then sent to the ICL7106 for conversion and driving of the LCD.