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SINGLE_TRANSISTOR_AUTO_TACHOMETER

2016-05-08 14:07  
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SINGLE_TRANSISTOR_AUTO_TACHOMETER
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.