Published:2009/7/16 3:49:00 Author:Jessie | From:SeekIC
Uses zener diode to compensate for variations in 12-v supply. Meter is calibrated in rpm, using R3 for 0ncl adjustment. Range is 0 to 6,000 rpm. Input is ignition wave-form.-J. Cowan, Auto Tachometer Uses Transistor, Electronics, 31:33, p 92-94.
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