LM331 Frequency to Voltage Converter

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 tim
LM331 Frequency to Voltage Converter - schematic

e. 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. Using this circuit, we can accept positive or negative or differential control voltages. When the control voltage is zero, the output frequency is zero. To charge the timing capacitor C1 linearly, the 741 op amp forms a current source controlled Continue reading †’. The following voltage to frequency converter (V/FC VCO) circuit consist of a UJT (uni-junction transistor) oscillator in which the timing charge capacitor C2 is linearly depends on the input signal voltage. The voltage across resistor R5 set the charging Continue reading †’. Voltage-to-frequency converter (VFC) circuit is shown in the schematic diagram below. The circuit employs 555 IC as the core of its function. This circuit uses +5V and -5V supply voltages, and the input is limited to 0-2V. You can adjust Continue reading †’. Using this circuit a low voltage battery can be increased to 5V. The need of input voltage of this circuit is only 1. 5V and the output voltage is 5V at 40mA. Using 2. 4V input, this circuit can supply 180mA at Continue reading †’. This is a TMP01 Temperature-to-Frequency Converter circuit. Converting voltage to the...

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