TACH_DWELL_METER

Published:2009/6/28 21:53:00 Author:May | From:SeekIC

Built around SN7402 NOR-gate IC. Requires no internal battery; required 5 V is obtained by using 50 ohms forR3 in zener circuit shown if car battery is 6 V, and 300 ohms if 12 V. Article gives calibration procedure for engines having 4, 6, and 8 cylinders; select maximum rpm to be indicated, multiply by number of cylinders, then divide by 120 to get frequency in Hz.-N. Parron, Tach-Dwell Meter, Wireless World, Sept. 1975, p 413.



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