Photodiode noise cancelling, how to?

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A simple FM modulator may be done with the VCO section of a CD4046. The timing capacitor and resistor should be of low Tempco and the supply voltage regulated for low drift.
 
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    neazoi

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schmitt trigger said:
A simple FM modulator may be done with the VCO section of a CD4046. The timing capacitor and resistor should be of low Tempco and the supply voltage regulated for low drift.
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Can you give a schematic for it please?
 

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