This is the first conversion circuit posted here.Here this circuit uses a IC LM331 which is basically a precision voltage to frequency convertor.This IC has lot of applications with it here we are about to use it as a simple frequency to voltage conversion.Lets see how this circuit works.
WORKING:
In this circuit the frequency conversion was attained by differentiating the input frequency by using Capacitor C3 and Resistor R7 and feeding the resultant frequency to the pin6 of the IC which was the threshold of the IC(refer the below pin diagram).The negative going edge of the resultant pulse train at pin 6 makes the built in comparator circuit to trigger the timer cirrcuit inbuild within it.
- The output voltage depends on the equation Vout= ((R4)/(R5+R6))*R1C1*2.09V*Fin
