This sound frequency meter circuit is simple to build and can be constructed in a portable format. In can measure frequencies with a minimum level of 10 mVrms and a maximum frequency of up to 100kHz.
The circuits illustrated below can be used to measure an AC line frequency using the LM2917 frequency-to-voltage converter and DATEL’s DMS Series digital voltmeters. The circuit in Figure 1 is used to ...
In many instrumentation systems, the ratio of two frequencies has more significance than the two individual frequencies. One such application is the ratiometric capacitive sensor. In this case, two ...
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