Posted on Nov 18, 2012

Six components can configure a circuit whose output voltage is proportional to its input frequency. The average current (hvc from the 40106 Schmitt trigger inverter`s ground pin 8 is linearly dependent on the frequency at which CO is discharged into the op amp`s summing junction.

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The op amp forces this current to flow through the 13.33-Kfl feedback resistor, producing a corresponding voltage drop. This frequency-to-voltage converter yields 0 to -10 V output with 0 to 10kHz input frequencies.

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