A simple voltage-frequency converter. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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A simple voltage-frequency converter. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Note to the student

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With an operational amplifier and an integrated timer at your disposal, you can make a simple, but high-performance voltage-to-frequency converter (see figure).

Timer DD1 is included according to the standard multivibrator circuit with the only difference that the time-setting resistor is replaced by a current generator on the operational amplifier DA1. This solution made it possible to obtain a non-linearity of the transformation not exceeding 3%.

Simple voltage-to-frequency converter

With the ratings of the elements indicated on the diagram, a change in the input voltage from 0 to 5 V caused a linear increase in the frequency at the output of the device from 0 to 21 kHz (conversion rate 4,2 kGV / V).

In the voltage-frequency converter, you can use the domestic OS K140UD7 and the timer KR1006VI1. To obtain high linearity of the conversion, the deviation of the resistance of the resistors R1-R3, R5 from the nominal value should not exceed 0,5%.

Literature

Amaterske Radio, 1984, No. 4. c. 152.
Radio 2-85, p.61

Publication: N. Bolshakov, rf.atnn.ru

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