Frequency-to-volt age converter

This circuit converts frequency to voltage by taking the average dc value of the pulses from the 74121 monostable multivibrator. The one shot is triggered by the positive-going ac signal at the input of the 529 comparator. The amplifier acts as a dc filter, and also provides zeroing. The accuracy is 2% over a 5 decade range
Frequency-to-volt age converter - schematic

The input signal to the comparator should Jbe greater than 0 volt peak-to-peak, and less than 12 volts peak-to-peak for proper operation.

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