The Voltage / Frequency Converter converts a variable analog input signal into an output pulse train. The frequency of this pulse wave is directly proportional to the input voltage, indicating a linear relationship between the two. It also serves as a precise frequency-to-voltage (F/V) converter, capable of accepting a variety of input frequency waveforms and producing a voltage output that matches the input frequency. A full V/F or F/V system can be quickly created using only two capacitors, three resistors, and a reference voltage.