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Attenuator Input Voltage Problem

simulate this circuit – Schematic created using CircuitLab I'm trying to use an attenuator with a PIC32 microcontroller. Basic idea is that; 1) I enter attenuation value through computer 2) ...
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Voltage Controlled Attenuator

I'm trying to create a DC voltage attenuator which linearly scales the loss relative to an applied control voltage "Vc". In other words, K = Vout/Vin is a linear function of Vc. Vin is guaranteed to ...