12/8/2022 0 Comments Av rf converter circuitThey display the rate of rotation in the form of voltage which is why a frequency to voltage converter is required in them. Frequency to voltage converter in tachometers.Ī digital tachometer is an electronic device which measures the rate of rotation of a wheel.We will discuss the following applications in detail: These converters are used in wide range of applications such as communication, power control, measurement and instrumentation systems etc. The value of the resistor R3 is dependent upon the supply voltage. Therefore we get the output voltage across the resistor R4 which is proportional to the frequency of the input. 15V DC is used in this circuit but the operating voltage of IC can be between 5 volts to 30 volts DC. The current flowing out of pin 6 is proportional to the values of capacitor C1 and resistor R1 (which are also known as the timing components) and the input frequency. The timer circuit gets triggered by the built-in comparator circuit in the IC when the negative edge of the pulse train appears at pin 6. The input frequency is differentiated by using the resistor R7 and capacitor C3 and then the resultant pulse train goes to pin 6. The input frequency is given at pin 6 and the output voltage is taken from pin 1. The source is connected to pin 8 and supplies 15V DC. The voltage on the output is proportional to the frequency at the input. In this circuit, lm331 is used to convert frequency into voltage. Its applications also include A to D conversion and long term integration. This IC is basically a voltage to frequency converter but it can be used as a frequency to voltage converter. This is the circuit diagram of frequency to voltage converter using LM331. The precision switch and the monostable multivibrator generate a pulse of a specific amplitude and period which is fed into the averaging network. This happens for all the cycles of the input waveform. An integrator is connected in it and the capacitor discharges into this integrator or a low pass circuit. The circuit charges the capacitor to a certain level. The above block diagram shows a frequency to voltage converter.
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