Digital tachometer schematic

  
Automotive engine pulse points or other sensors to be filtered in the transmission device 3130 CMOS op amp, the op amp is used as a comparator to complete the input conditions.
Digital tachometer schematic - schematic

Pulse then flows through to 4046 PLL-N counter, the counter counts the number of engine cylinders (four cylinder 60,6 45,8 30 - a) the output frequency is 0.5 seconds to get in rpm engine speed.




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