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Frequency to Voltage Converter (LM331)

2016-01-19 18:58  
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This article describes the Frequency to Voltage Converter (LM331). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: LM331.

The frequency to voltage converter circuit illustrated in the schematic diagram below produces a 10 V output for 10 kHz full scale input (square waves or pulses).? The simplicity of the circuit doesn’t mean a bad performance: this circuit has linearity about 0.06% at full scale. For your note, there is a trade-off between ripple versus response time. With Cfilter at 1uF, the output ripple is about 13 mV with 0.6 s settling time. The response time will be quicker if Cfilter is decreased in the expense of increased ripple by the same factor. An increase in Cfilter produces the opposite results. Set the 5Kohm gain adjust for 10 V out with a 10 kHz input to trim.

Basic F V converter circuit schematic diagram


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