Ignition pulses counter

The Digi-Tach contains a master-clock circuits (U6)v latch and reset pulse generators (U2-b-U2-d), input signal bonditioner (Ul, U2-a), pulse counter (U3), display and display drivers (DIS1, DIS2, U4, and U5), and a voltage regulator (U7).
Ignition pulses counter - schematic

As an added feature, Digi-Tach contains a dimmer circuit (U2-e).

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