# Frequency to Voltage Converter With LM2917

**The circuit of frequency to voltage converter with LM2917** is used in the speed measuring devices, measuring instruments and measuring mileage rotation speed. Frequency-to-voltage converter circuit uses IC LM2917 is a frequency converter to a DC voltage that is quite simple because the LM2917 IC specially designed by National Semiconductor as a frequency to voltage converter that does not require many external components. Frequency-to-voltage converter circuit with IC LM2917 can be operated with a working voltage of +12 volts DC to +24 volts DC. IC LM2917 has a linear output with a maximum output current of 30mA. *Frequency to voltage converter circuit* and components to make the converter can be seen directly in the series of images below.

## Frequency to Voltage Converter With LM2917

The circuit of frequency to voltage converter with LM2917 above is an example of a frequency-to-voltage converter applications taken from datasheet IC LM2917.

### Output Of Frequency to Voltage Converter With LM2917

Frequency to voltage converter circuit using LM2917 IC is capable of providing a DC voltage output of 0 volts when the input signal frekuens 0Hz. The magnitude of the output voltage of the frequency to voltage converter circuit IC LM2917 above can be determined by the following mathematical equation.

**Vout = Fin x Vcc x R1 x C1**

Where :

Fin = input signal frequency (Hz)

Vcc = voltage source used (volt)

R1 = Resistor on pin 3 of IC LM2917 (Ohm)

C1 = capacitor on pin 2 of IC LM2917 (Farad)

The circuit of frequency to voltage converter with LM2917 is often applied to the measurement of the speed using a microcontroller or an analog meter. For applications with digital devices output from frequency to voltage converter circuit requires Analog to Digital Converter (ADC). And for applications the *frequency to voltage converter with LM2917* can be connected to an analog meter or is connected to the amplifier to drive the LED or VU meter.