SPARK_COIL_TACHOMETER_

Published:2009/7/1 20:11:00 Author:May | From:SeekIC

Input to National LM2917 tachometer IC is taken from spark-coil distributor terminal of gasoline engine. Frequency of input signal is converted to voltage for driving meter. Circuit is set up for number of cylinders on engine by adding link for appropriate timing resistor. Zener protects IC from transients found in auto battery circuit.- Linear Applications, Vol. 2, National Semiconductor, Santa Clara, CA, 1976, AN-162, p 9-10.



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