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 ...
The circuit shown in the figure below will have a display reading of “1999” for an input frequency of 33.33Hz (equivalent to 1999 rpm). The 0.0477µF capacitor (C1) should have a ...
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