A Voltage to Frequency VTF converter is a circuit, which converts a voltage level to a linearly proportional frequency. A special configuration of the LM IC performs this conversion. Interestingly, this same IC also performs the FTV conversion as shown in the previous pages of this article. It has to be very precise to compensate for any tolerance errors, which is why a pre-set is used. Hence, the equation simplifies to that shown below.

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LM 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 make the IC well suitable for the applications mentioned above.

Here the LM 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. Can we step down the V to 12V 50Hz using transformerless X-Rated capacitor stepdown circuit for measuring the voltage.

Hi Trying to calculate Vout, but are getting odd numbers. Can this circuit be utilized when the input frequency signal is a square wave? Please help. Please refer Ti datasheet. Thanks for this circuit! Does this mean that this circuit only function properly with square waves?

Thanks for the circuit. My question is : Can I use the same circuit? Hi Paresh use the Fig2 of the Fairchild application data. Dear sir. Im why if I use the IC KA can not work rangkain not remove the voltage at the foot of an IC tersebu, while reverensi foot 2 is the voltage. How can i make my my circuit more stable using a lm by producing a stale voltage for high frequencies. Hi Deepu you are right. Hey, I checked circuit above and first question which came to my mind is: It is possible to calculate elements and construct a circuit on LM adjustable from low frequencies 50Hz to highest for example kHz?

Could you explain what part should be extended in this case or could you give me some tips for it? Thnaks, Sanczos. Thanks for the F-V circuit that you have sent to me today, indeed I had lounged for it for so long. Thanks; Ssekatawa.

Allthough power factor correction circuits are achievable, the usage of them are pretty much illegal unless under license. Author jacky. Proteus Tutorial — Switches and Relays March 8, Audio oscillator circuit February 22, Geytharanathan 3 years ago.

Hi Can we step down the V to 12V 50Hz using transformerless X-Rated capacitor stepdown circuit for measuring the voltage. Can this circuit be connected with lm for car tachometer. Dear 5 years ago. KimJ 5 years ago. CoKord 6 years ago. Anum 6 years ago. Tim Maloy 6 years ago. Sorry, looks like this has already been covered. Seetharaman 7 years ago. D 7 years ago.

Tohar barka wala gaar. Paul C 7 years ago. Blaza 9 years ago. What is the maximum frequency of this circuit? Deepu 10 years ago. Regards D. Sanczos 10 years ago. Thanks; Ssekatawa Allthough power factor correction circuits are achievable, the usage of them are pretty much illegal unless under license. Ssekatawa Geoffrey Uganda 10 years ago.

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## Frequency to voltage converter using LM331

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## LM331 Voltage to Frequency Converter Circuit

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