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Tachometers / RPM Circuits

Analog Tachometer for Gasoline Engines
Available-light phototachometer simplifies outdoor remote sensing:  01/25/99 Electronic Design - Ideas for Design / Tachometry, the measurement of the speed of rotating objects, is a common enough application that has many practical but few noteworthy solutions. Some of these jobs, however, have quirky aspects. . .
Digital Tachometer Avoids Analog Vices:  11/10/94 EDN-Design Ideas / (requires a password)
Optical Tachometer Provides BiDirectional Info:  05/21/98 EDN-Design Ideas / (requires a password)
Simple Circuit Measures Diesel's Rotations Per Minute:  03/04/99 EDN-Design Ideas /  PDF contains multiple circuits - scroll to find this circuit. (have to obtain a password first)
Speed Limit Alarm
Tachometer Demodulator has Fast Response Time:  12/07/95 EDN-Design Ideas /  (requires a password)
Tachometer Measures Very Low Frequencies :  08/23/04  Electronic Design - Design Briefs /  The circuit shown in the figure is a three-digit tachometer that lets you measure low-frequency events recurring at intervals of 0.235 to 15 seconds--that is, from 4 to 255 rpm. Thus, it's suitable for... )....
Wireless Auto Tachometer

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