555 tachometer circuit diagram

As shown from the switch contacts, proportional to the speed pulse signal Vi, after the differential is added to IC (1/2 556) trigger side to make the single stabilizing circui

t generates a pulse of fixed width, td 1.1R2C2, different speed has its proportional number of pulses, one-shot pulse output by the constant current source VT1 and C3 integral to obtain a voltage proportional to the rotational speed, it can speed digital readout on the meter. This circuit is also referred to as the rate of voltage conversion circuit.

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