Simple tachometer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Speedometers and tachometers
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A simple automobile tachometer, the diagram of which is shown in the figure, is designed to measure the crankshaft speed of carburetor engines with an electrical system in which the minus of the battery is connected to the housing.
The basis of the circuit is a single pulse shaper, assembled on a CD4007 microcircuit (domestic analogue - K176LP1). The shaper is started by positive pulses that occur at the moment of opening the breaker contacts.
Device RA1, connected to the output of the shaper through the limiting resistor R5, measures the voltage across the measuring capacitor C1, which is proportional to the frequency of the input pulses with an accuracy of no worse than 1...2%.
The pulse repetition rate is 30 times less than the frequency of rotation of the crankshaft of a four-stroke engine.
Author: T.Tikhomirov, Chita
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