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. . .
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... )....
