Voltage to Frequency Converter Circuit

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Voltage-to-Frequency-Converter-Circuit.jpg


Note:
R4 = 180K Resistor
D1 to D5 = 1N4148 Diode

If Vin less than V2, the output of IC2 will be the positive ramp waveform, C1 will discharge slowly cause the T1 range as long times. And reduce the value of V2 down, but if V1 more than V2, the output of IC2 will be the negative ramp waveform (into zero).

Next, cause C1 discharges faster, the time range T1 so lower down, and when V1 equal V2 voltage output of IC2 will It is a constant, unchanging.

When the circuit to output a constant, then (Vin = V2) means that V1 is the proper frequencies produced. Because Conditions of the circuit is Frequency is the appropriate value of V2. So V1 is appropriate as well.

A good temperature stability, Because the temperature coefficient of D3 and D4, make charging to C3 change.

We fix it put diode features same D3 and D4 (D1 and D2) in series with R3, To compensate for temperature changes according to the non-inverting input pin of IC1.

VR2 adjusts the offset voltage to IC2 to output voltage no error.

The P1 is used to fine adjust the changing the voltage to frequency, The values obtained were in the range of 1 kHz per volts.

Note: This circuit is just ideas and I never test them. So you should build carefully it.
 
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