Frequency to voltage converter using LM331


Posted on Feb 6, 2014

LM331 is basically a precision voltage to frequency converter from National Semiconductors. The IC has a hand full of applications like analog to digital conversion, long term integration, voltage to frequency conversion, frequency to voltage conversion. Wide dynamic range and excellent linearity makes the IC well suitable for the applications men


Frequency to voltage converter using LM331
Click here to download the full size of the above Circuit.

tioned above. Here the LM331 is wired as a frequency to voltage converter which converts the input frequency into a proportional voltage which is extremely linear to the input frequency. The frequency to voltage conversion is attained by differentiating the input frequency using capacitor C3 and resistor R7 and feeding the resultant pulse train to the pin6 (threshold) of the IC. The negative going edge of the resultant pulse train at pin6 makes the built-in comparator circuit to trigger the timer circuit. At any instant, the current flowing out of the current output pin (pin 6) will be proportional to the input frequency and value of the timing components (R1 and C1). As a result a voltage (Vout) proportional to the input frequency (Fin) will be available across the load resistor R4.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Leach amplifier
Crystal oscillator
Cheap Motorcycle Alarm
Bat Feed GO
converter lhc20 5ka 18v
bugbot
Schematic Diagram Basic Levitation and Magnetic Levitation Circuit Project
88-108mhz FM transmitter circuit production PCB
30 Watt Audio Power Amplifier Schematic
AM radio rf amplifier
Dimming circuit using capacitance
Simple and practical circuit diagram of an elevator failure alarm



Top