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V-F converter. As a variant, use 2 transistors and zener instead of dinistor. As a better variant, use a one-shot monovibrator (2-3 transistors), make its time T equal to R2*C for linearity
+Vin ----+
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R1
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*----Dinistor--R2-+ +--- out
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C Optocoupler
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-Vin ----*-----------------+ +---
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