Digital tachometer schematic

Posted on Mar 28, 2007

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
Click here to download the full size of the above Circuit.

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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