Saturday, October 15, 2022
HomeElectronicsA Fundamental Voltage To Frequency Converter

A Fundamental Voltage To Frequency Converter


efy testedA confirmed approach to ship an analogue sign a protracted distance is to move the sign as a frequency utilizing a voltage to frequency converter (VFC), a particular circuit whose output is a frequency that’s proportional to its enter voltage.

In precept, it’s comparatively straightforward to ship a frequency sign over a protracted transmission path with out interference by optical, coaxial, or radio hyperlinks. The frequency is then reconverted to an analogue voltage by a FVC that’s normally tailor-made to carry out its inverse perform, usually utilizing a phase-locked loop (PLL). Block diagram of the mission is proven in Fig. 1.

Fig. 1: Block diagram of voltage to frequency converter
Fig. 1: Block diagram of voltage to frequency converter

This mission makes use of an odd method to design and construct a hobby-level VFC module utilizing a handful of simply obtainable and cheap digital parts. Creator’s circuit of the VFC module wired on a breadboard is proven in Fig. 2.

Fig. 2: Author’s circuit on a breadboard
Fig. 2: Creator’s circuit on a breadboard

Schematic diagram of the VFC module is proven in Fig. 3. Please word, a well-regulated 5V DC energy supply is totally essential to run this VFC circuit. Coronary heart of the circuit is the venerable CMOS micropower phase-locked loop IC HEF4046B.

The HEF4046B (IC1) features a VCO sub-system along with section comparators and different parts. It may well generate a sq. wave with 50% responsibility cycle. The frequency in all fairness near 0Hz-1kHz vary, which is curbed by the 100nF capacitor (C1) and the 10k resistor (R1).

This mission shall be revealed in just a few weeks. If you wish to entry it now, check with Electronics For You’s October 2022 Difficulty–print or ezine version.



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