Frequency-to-Voltage converter circuit can use LM331
(Precision Voltage-to-Frequency Converters) by circuit below
But out put form pin 1 of lm331 is current so we must be careful
Input impredance of circuit that connected with this circuit
Fin 10kHz full scale
Vout = Fin * 2.09V*(RL/Rs)*(Rt*Ct)
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