The car engine tachometer (1)

Published:2011/7/23 8:31:00 Author:qqtang | Keyword: engine tachometer | From:SeekIC

The working principle of the circuit The car engine tachometer consists of the 9V regulator circuit, single steady trigger circuit and current indicating circuit, see as figure 7-73. The +9V voltage stabilizing circuit consists of the resistor R1, regulator diode VS1 and filter capacitor C1. The single steady trigger consists of the time-based integrated circuit IC, resistors R2-R5, capacitors C2-C4 and regulated diode VS2. The current indicating circuit consists of the diode VD, resistor R6, potentiometer RP and ampere meter PA.



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